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Showing papers on "Sodium silicate published in 1972"


Journal ArticleDOI
TL;DR: In this paper, the infrared spectra of 12 sodium silicate glasses of varying composition (10 to 45 mole% Na2O) were examined at varying pressures to 58.8 kbar.
Abstract: Infrared absorption spectra of 12 sodium silicate glasses of varying composition (10 to 45 mole% Na2O) are examined at varying pressures to 58.8 kbar. The pressure dependences of all the infrared absorption frequencies studied are found to be positive. Gruneisen γ's are evaluated from the pressure dependence of the infrared vibrations and elastic parameters. The results are compared with those obtained from previous high‐pressure studies of α‐quartz and several other silicate glasses.

78 citations


Patent
03 Feb 1972
TL;DR: In this paper, the authors describe a process for the MANUFACTURE of an ECONOMICAL FILLer of low-bulk densities that is ESPECIALLY USEFUL for companies in UNSATURATED POLYESTER systems.
Abstract: THE INVENTION RELATES TO A PROCESS FOR THE MANUFACTURE OF AN ECONOMICAL FILLER OF LOW BULK DENSITY THAT IS ESPECIALLY USEFUL FOR INCORPORATION IN UNSATURATED POLYESTER SYSTEMS AND WHICH DOES NOT REACT WITH THE COMPONENTS OF THE UNSATURATED POLYESTER SYSTE,. SOLUTIONS OF SODIUM SILICATE AND AMMONIUM PENTABORATE ARE MIXED, SPRAY DRIED, AND THE PRODUCT FROM THE SPRAY DRIER IS THEN FURTHER DRIED TO A WATER CONTENT BELOW ABOUT 7%.

53 citations


Patent
20 Jul 1972
TL;DR: In this article, the authors describe the reaction of a soluble sodium silicate and aluminum sulfate in producing precipitates commonly known and identifiable as sodium alumino silicates, the precipitate being ultimately collected as a dried particulate material of sub-micron particle size.
Abstract: The subject matter of the following specification concerns the production of finely divided materials useful as pigments, moisture conditioners, paper fillers, and in rubber reinforcement and the like. Considering present economics, perhaps the most practical embodiment of the subject matter employs the reaction of a soluble sodium silicate and aluminum sulfate in producing precipitates commonly known and identifiable as sodium alumino silicates, the precipitate being ultimately collected as a dried particulate material of sub-micron particle size. The disclosed process involves conducting this general type of reaction in the presence of calculated quantity of sodium sulfate from the outset of the reaction whereby economics are improved and highly refined modifications in the characteristic of the final materials become obtainable. The reaction may be varied according to several conditions, such as pH, temperature, concentration, manner of feeding materials and the like whereby to better adapt the new materials to highly specialized needs, such as in rubber compounding and paper production.

37 citations


Patent
12 May 1972
TL;DR: In this article, the authors describe a process for the MANUFACTURE of an ECONOMICAL FILLer of low-bulk density that is ESPECIALLY USEFUL for companies in UNSATURATED POLYESTER systems.
Abstract: THE INVENTION RELATES TO A PROCESS FOR THE MANUFACTURE OF AN ECONOMICAL FILLER OF LOW BULK DENSITY THAT IS ESPECIALLY USEFUL FOR INCORPORATION IN UNSATURATED POLYESTER SYSTEMS AND WHICH DOES NOT REACT WITH COMPONENTS OF THE UNSATURATED POLYESTER SYSTEM. SOLUTIONS OF SODIUM SILICATE AND INORGANIC POLYSALTS ARE MIXED, SPRAY DRIED, AND THE PRODUCT FROM THE SPRAY DRIER IS THEN FURTHER DRIED TO A WATER CONTENT BELOW ABOUT 7%.

33 citations


Patent
R Bartholomew1, B Swinehart1, J Pierson1, S Stookey1, S Lewek1, F Marusak1, D Campbell1, Harold F. Dates1 
01 May 1972
TL;DR: In this paper, the production of glasses included within particularly defined ranges of the sodium silicate and/or potassium silicate composition system which will spontaneously degrade or disintegrate in the ambient atmosphere into relatively non-polluting residual material.
Abstract: The present invention relates to the production of glasses included within particularly-defined ranges of the sodium silicate and/or potassium silicate composition system which will spontaneously degrade or disintegrate in the ambient atmosphere into relatively non-polluting residual material.

21 citations


Patent
22 Dec 1972
TL;DR: In this article, a compression molded, corrosion inhibiting thermal insulating product for use at temperatures up to about 1,800* F is described, which is essentially a product formed by the mixture of about 35-52% water, about 20-32% expanded perlite, about 1.75-3.0% sodium tetraborate, about 2.5-3 0.5% chopped inorganic fiber, about 0.33-2.0%.
Abstract: A compression molded, corrosion inhibiting thermal insulating product for use at temperatures up to about 1,800* F. is disclosed as comprising essentially a product formed by the mixture of about 35-52% water, about 20-32% expanded perlite, about 1.75-3.0% sodium tetraborate, about 2.5-3.0% sodium silicate, about 1.0-3.5% chopped inorganic fiber, about 0.33-2.0% silicone, and about 13.5-21.0% of a binder consisting of a metallic phosphate such as aluminum phosphate. A method of mixing constituents of the product and then compression molding the products into various shapes is also disclosed.

20 citations


Patent
Akanuma T1, Arita T1
23 May 1972
TL;DR: In this article, a method for producing a dry flowable blended sand and using this sand in making a casting mold is described, in which the blended sand is prepared by mixing a refractory particle such as silicious sand, with an alkali metal silicate solution, such as a sodium silicates solution of at least 40 percent (weight) solids content whose SiO2 to Na2O molar ratio has previously been adjusted with NaOH solution to a molar ratios of 0.7 to 1.1 to thereby precipitate and deposit crystalline alkali
Abstract: A method is described for producing a dry flowable blended sand and using this sand in making a casting mold. The blended sand is prepared by mixing a refractory particle, such as silicious sand, with an alkali metal silicate solution, such as a sodium silicate solution of at least 40 percent (weight) solids content whose SiO2 to Na2O molar ratio has previously been adjusted with NaOH solution of at least 40 percent (weight) solids content to a molar ratio of 0.7 to 1.1 to thereby precipitate and deposit crystalline alkali metal silicate on the surface of said refractory particle, and thereafter blending the thus treated refractory particle with a powder of silicon, silicon alloy such as ferrosilicon, silicide such as calcium silicide or a mixture thereof, pouring the blended sand into a molding frame and allowing it to harden therein. The precipitation and deposition of the alkali metal silicate from solution is hastened by the addition of an alcohol such as methanol, or metal salt such as NaCl to the alkali metal silicate solution.

18 citations


Patent
09 Mar 1972
TL;DR: A method of producing sodium chromate from chromite ore, which involves mixing the ore with sodium carbonate and a refractory diluent, pelleting the mixture using an aqueous solution of sodium hydroxide, potassium hydroxides, sodium aluminate, sodium silicate, or mixtures thereof, is described in this article.
Abstract: A method of producing sodium chromate from chromite ore, which involves mixing the ore with sodium carbonate and a refractory diluent, pelleting the mixture using an aqueous solution of sodium hydroxide, potassium hydroxide, sodium aluminate, sodium silicate, sodium chromate, or mixtures thereof; drying and roasting the pellets under oxidizing conditions, then disintegrating and extracting the pellets to obtain an aqueous solution of sodium chromate.

17 citations


Patent
24 Apr 1972
TL;DR: In this article, a process for making copper-colored ruby glass was described, in which a copper-tin alloy (bronze) is wetted with sodium silicate water glass solution and introduced into a soda-lime glass batch, together with potassium nitrate, as an oxidizing agent, and in the absence of reducing agents, melted at up to 1,480*C and in which ruby-red coloration appeared upon rapid cooling.
Abstract: A process for making copper-colored ruby glass in which a copper-tin alloy (bronze) is wetted with sodium silicate water glass solution and introduced into a soda-lime glass batch, together with potassium nitrate, as an oxidizing agent, and in the absence of reducing agents, melted at up to 1,480*C and in which ruby-red coloration appears upon rapid cooling.

13 citations


Patent
05 Oct 1972
TL;DR: In this paper, fire-resistant compositions comprising gypsum or gypsus and magnesium oxysulfate and a synthetic material including a processed mixture of anhydrous sodium silicate, liquid sodium silicates and a heat triggered neutralizer such as boric acid are presented.
Abstract: Fire-resistant compositions comprising gypsum or gypsum and magnesium oxysulfate and a synthetic material including a processed mixture of anhydrous sodium silicate, liquid sodium silicate and a heat triggered neutralizer such as boric acid. If desired, a bulk density modifier such as Portland cement may be added. The fire-resistant compositions may be fabricated into construction elements such as wallboard, soundproofing panels and thermal insulation or applied as a spray to provide furnace linings, fireproofing coating layers on girders and the like.

13 citations


Patent
09 Mar 1972
TL;DR: A method for recovering chromium values from chromite ore which initially involves pelleting a mixture of chromite ores and soda ash, preferably without the inclusion of recycled leached chromite residue or other refractory diluent, employing water, or preferably an electrolyte such as an aqueous solution of sodium hydroxide, potassium hydroxides, sodium aluminate, sodium silicate, sodium chromate or a mixture thereof as thepelleting liquid as mentioned in this paper.
Abstract: A method for recovering chromium values from chromite ore which initially involves pelleting a mixture of chromite ore and soda ash, preferably without the inclusion of recycled leached chromite ore residue or other refractory diluent, employing water, or preferably an electrolyte such as an aqueous solution of sodium hydroxide, potassium hydroxide, sodium aluminate, sodium silicate, sodium chromate or a mixture thereof as the pelleting liquid. To reduce the tendency of the pellets to melt and fuse during the roasting step, the chromite ore is heated under oxidizing conditions, either before or after being incorporated into the pellets, to an extent sufficient to oxidize at least 40% of the contained ferrous oxide to the ferric state. The pellets are next roasted under oxidizing conditions, preferably in a static bed, then disintegrated and extracted to obtain an aqueous solution of the soluble sodium chromate thus formed.

Patent
31 Jul 1972
TL;DR: Olefin polymerization catalysts, formed of a silica produced employing lithium silicate, produce ethylene polymers of higher melt index than are obtained when sodium silicate is employed as discussed by the authors.
Abstract: Olefin polymerization catalysts, formed of a silica produced employing lithium silicate, produce ethylene polymers of higher melt index than are obtained when sodium silicate is employed.

Journal Article
TL;DR: A review of the literature on the use of sodium silicates in soil stabilization processes can be found in this paper, where the authors have summarized pertinent information on stabilizer properties, reaction mechanisms, injection methods of soil solidification, properties of stabilizer soil mixtures, and use of salt as dustproofers and waterproofers and as secondary additives with other stabilizers.
Abstract: This report consists of an annotated bibliography and summary review of the important literature on the use of sodium silicates in soil stabilization processes. Annotations are given for approximately 90 articles published between 1931 and 1965. On the basis of these articles the authors have summarized pertinent information on stabilizer properties, reaction mechanisms, injection methods of soil solidification, properties of stabilizer soil mixtures, and use of sodium silicates as dustproofers and waterproofers and as secondary additives with other stabilizers. There is some evidence that sodiumsilicate stabilization can increase the strength and durability of sandy soils or even relatively nonplastic finegrained soils under mild climatic conditions; however, there is almost no field evidence to justify its use when the stabilized material is subjected to the freezing and thawing cycles typical of temperature-to-cold climates. Sodium silicates with or without the addition of precipitants are of little value in dustproofing or waterproofing finegrained soils. On the other hand, laboratory tests seem to indicate that sodium silicate used as an additive can improve the strength and durability of soils stabilized with portland cement, lime, or lime-fly ash.

Patent
04 Aug 1972
TL;DR: A refractory composition consisting essentially of 20-80 per cent carbon 4-30 percent silicon for ferrosilicon, and the balance of clay, grog, alumina, bentonite, bauxite or zircon is formed to a desired shape and fired at a temperature of 2,400*F - 3,200*F.
Abstract: A refractory composition consisting essentially of 20-80 per cent carbon 4-30 percent silicon for ferrosilicon, and the balance of clay, grog, alumina, bentonite, bauxite or zircon. This composition is formed to a desired shape and fired at a temperature of 2,400*F - 3,200*F. Preferably the shaped composition is heated quickly through a temperature of 800*F 2,500*F in no more than 4 hours and fired at above 2,500*F for at least 3 hours. Instead of firing the brick the composition may include chemical bonding agents such as sodium silicate, aluminum phosphates, ammonium phosphates and phosphoric acid, and the shaped composition simply dried to remove water and form a bonded article.

Patent
03 May 1972
TL;DR: A method of preparing a particulate detergent builder includes admixing liquid sodium silicate with anhydrous soda ash having a particle size of less than 200 microns at a temperature between 21*-51*C, passing the resultant wetted granules through at least an eight mesh screen and rapidly heating the screened material to in excess of 100*C.
Abstract: A method of preparing a particulate detergent builder includes admixing liquid sodium silicate with anhydrous soda ash having a particle size of less than 200 microns at a temperature between 21*-51*C., passing the resultant wetted granules through at least an eight mesh screen and rapidly heating the screened material to in excess of 100*C.


Patent
17 Apr 1972
TL;DR: In this article, the authors proposed a method of decreasing the viscosity of foundry sand additive slurries by the use of up to 3 percent of sodium silicate or potassium silicate in the additive slurry to provide a workable slurry having a high percentage of solids therein.
Abstract: Structure for and the method of decreasing the viscosity of foundry sand additive slurries by the use of up to 3 percent of sodium silicate or potassium silicate in the foundry sand additive slurries to provide a workable slurry having a high percentage of solids therein for foundry sand requiring a high ratio of additives to water for proper tempering and rebonding thereof.

Patent
14 Apr 1972
TL;DR: In this article, a ferrous metal substrate such as a steel compressor blade or vane shroud is protected against corrosion by means of an adherent protective duplex coating comprising a sacrificial thermally aluminised surface containing iron aluminide and a cured non-metallic barrier layer obtained from sodium silicates, potassium silicate, lithium silicate or ethyl silicate.
Abstract: 1345128 Coated metal substrates CHROMALLOY AMERICAN CORP 14 April 1972 [17 May 1971] 17328/72 Heading B2E [Also in Division C7] A ferrous metal substrate such as a steel compressor blade or vane shroud is protected against corrosion by means of an adherent protective duplex coating comprising a sacrificial thermally aluminised surface containing iron aluminide and a cured non-metallic barrier layer obtained from sodium silicate, potassium silicate, lithium silicate or ethyl silicate. A number of coats of the silicate may be applied by dipping and/or spraying with a solution containing also an anionic phosphate surfactant, the coats being cured in an infra-red furnace at 150-430‹C. A conversion coating which reacts with the silicate coat may also be sprayed on. The conversion coating may comprise phosphates and chromates, especially of Al, Mg, Be, Zn, Ba, Sr or Ce, Ba(OH) 2 or Ce 2 (CO 3 ) 3 . A further coating of silicate solution may then be sprayed over the conversion coating. The ferrous surface is initially aluminised by embedding the substrate in aluminium powder containing also some Al 2 O 3 and AlCl 3 , and heating.

Patent
03 Jan 1972
TL;DR: In this article, a liquid silicate reactant, such as phosphoric acid, is absorbed in an amorphous reactant carrier, preferably calcium containing, to form a dry premix composition that is blended with an aqueous alkali metal silicate to create a moldable silicate mix.
Abstract: A liquid silicate reactant, such as phosphoric acid, is absorbed in an amorphous reactant carrier, preferably calcium containing, to form a dry premix composition that is blended with an aqueous alkali metal silicate to form a moldable silicate mix. This mix is heated in a mold at a temperature sufficient to cause the removal of water therefrom, with small water gas bubbles being formed within and throughout the mix to produce a lightweight multicellular foam structure. The reactant and calcium ions are slowly leached from the carrier for reaction with the silicate during the foaming process, improving the water-insolubility and firmness characteristics of the resulting foamed structure. The rate of leaching is sufficiently slow, however, so as not to cause premature and rapid reaction with the silicate tending to reduce expansion of the structure. As a result, a low density foamed structure having a density of from about 3 to about 15, preferably less than 10, lbs/ft3 is obtained. The aqueous alkali metal silicate preferably comprises a combination of sodium silicate and potassium silicate, with the potassium silicate comprising from about 5 percent to about 10 percent by weight based on the total weight of alkali metal silicate employed.

Patent
08 Jun 1972
TL;DR: In this paper, the authors describe a process for preparing a granular detergent compositions, which consists of spraying spray and spraying spraying a slurry of 70-40% by using a mixture of mixture of SODIUM, OLEFIN SULFONATE, and MIXTURES.
Abstract: 1. A PROCESS FOR PREPARING A GRANULAR DETERGENT COMPOSITION WHICH COMPRISES SPRAY DRYING A SLURRY OF 70-40% BY WEIGHT OF A MIXTURE OF 10-40% BY WEIGHT OF AN ANIONIC SURFACE ACTIVE AGENT SELECTED FROM THE GROUP CONSISTING OF SODIUM ALKYLARYL SULFONATE (C8-C18), SODIUM OLEFIN SULFONATE (C8-C20), SODIUM ALKYL SULFONATE (C8-C20), SODIUM ALKYL SULFATE (C8-C20) AND MIXTURES THEREOF, 1540% BY WEIGHT OF SODIUM TRIPOLYPHOSPHATE, 15-40% BY WEIGHT OF SODIUM SILICATE HAVING AN NA2O TO SIO2 RATIO OF 0.5 -3, 0.5-10% BY WEIGHT OF MAGNESIUM SULFATE IN 3060% BY WEIGHT OF WATER.

Journal ArticleDOI
TL;DR: In this article, the wet interaction between sodium silicate and sodium aluminate has been studied with respect to the experimental variables such as concentration of the ingredient solutions, temperature during mixing, alkalinity and ratio of Al2O3:SiO3, in the mixture.
Abstract: With the object of preparing high exchanging homogeneous alkali alumino-silicate hydrogel wet interaction between sodium silicate and sodium aluminate has been studied with respect to the experimental variables such as concentration of the ingredient solutions, temperature during mixing, alkalinity and ratio of Al2O3: SiO3, in the mixture. It has been possible to arrive at an optimum condition for homogeneous gel formation.

Patent
07 Jul 1972
TL;DR: In this article, a mix-ture of ETHYLENE GLYCOL MONOACETATE (EGMA) and EGCDICETATE was used in a Sand/Sodium SILICATE and ANALOGOUS MIXTURES.
Abstract: SAND/SODIUM SILICATE AND ANALOGOUS MIXTURES ARE HARDENED BY A MIXTURE OF ETHYLENE GLYCOL MONOACETATE (EGMA) AND ETHYLENE GLYCOL DIACETATE (EGDA) IN WHICH THE WEIGHT RATIO OF EGMA TO EGDA IS 1:1 TO 1:9.

Patent
19 Jan 1972
TL;DR: In this paper, a process for the production of a bonded particulate material comprises forming a mixture of the said material with aqueous alkali metal silicate and a mix of glycerol diacetate (diacetin) and glycerolic triacetate(triacetin), and allowing it to harden in the said shape.
Abstract: 1,260,439. Foundry mould compositions. FOSECO INTERNATIONAL Ltd. 31 Dec., 1969, No. 63536/69. Addition to 1,150,541. Heading C3N. A process for the production of a bonded particulate material comprises forming a mixture of the said particulate material with aqueous alkali metal silicate and a mixture of glycerol diacetate (diacetin) and glycerol triacetate (triacetin) and allowing it to harden in the said shape. The particulate material may be sand whilst the alkali metal silicate is preferably sodium silicate in which the molar ratio of SiO 2 to Na 2 O is 2 to 3A3 : 1. It is preferred to employ a mixture of diacetin and triacetin comprising 1-10 parts, more preferably 2-2A5 parts, by weight of triacetin per part by weight of diacetin. The mixture of diacetin and triacetin is preferably present in the range 0A1 to 1% by weight and most preferably 0A2 to 0A5% by weight of the composition. The composition employed in the process may also contain silicon, dicalcium silicate or anhydride, of which dicalcium silicate is a preferred additive. Foundry cores or moulds may be made by this process.

Journal ArticleDOI
01 Dec 1972

Patent
Iler Ralph Kingsley1
12 Apr 1972
TL;DR: In this paper, the authors show that the size of SILICA particles in a HOT ALKALINE COLLOIDAL SILICA SOL can be increased by adding SODIUM SILICATE to the sol and removing SODIAIONS from the sol through a CATION EXCHANGE MEMBRANE into an ACID.
Abstract: THE SIZE OF SILICA PARTICLES IN A HOT ALKALINE COLLOIDAL SILICA SOL CAN BE INCREASED BY ADDING SODIUM SILICATE TO THE SOL AND REMOVING SODIUM IONS FROM THE SOL THROUGH A CATION EXCHANGE MEMBRANE INTO AN ACID. SALT FORMED BY MIGRATION OF ANIONS FROM THE ACID INTO THE SOL MUST BE MAINTAINED WITHIN A CONCENTRATION RANGE DETERMINED BY THE CONCENTRATION OF SILICA IN THE SOL.

Patent
29 Mar 1972
TL;DR: The storage stability is good; there is no caking tendency as discussed by the authors, and the hollow spheres dissolve in water rapidly, and the three builder components are prepd. in oneration by spray-dring their soln of dispersion.
Abstract: Mixt. of water-sol. free-flowing spherical hollow granules having a heaping wt of 120-300 g/l consists of sodium tripolyphosphate, sodium silicate and sodium sulphate, the wt. ratio P2O5:SiO2:Na2SO4 being 9:1:1.5 to 1.5:1:0.25, with addition of 18-19 wt. % (pref. 15-19 wt. %) of water. The three builder components are prepd. in oneration by spray-dring their soln of dispersion The hollow spheres dissolve in water rapidly. The storage stability is good; there is no caking tendency.

Patent
02 Feb 1972
TL;DR: In this article, a dry composition for the production of acid resistant cement or mortar compositions comprising an inert filler, a water-soluble solid sodium silicate and a condensed aluminium phosphate having a molar ratio of P 2 O 5 : Al 2 O 3 of from 1A1 : 1 to 3 : 1, which has been obtained from an acid aluminium phosphate, having the said molar composition by heating it in a first stage at a temperature not exceeding 400
Abstract: 1,262,162. Silicate compositions. FARBWERKE HOECHST A.G. 30 May, 1969, No. 27445/69. Heading C3N. A dry composition for the production of acidresistant cement or mortar compositions comprising an inert filler, a water-soluble solid sodium silicate and a condensed aluminium phosphate having a molar ratio of P 2 O 5 : Al 2 O 3 of from 1A1 : 1 to 3 : 1, which has been obtained from an acid aluminium phosphate having the said molar composition by heating it in a first stage at a temperature not exceeding 400‹ C. until its weight remains constant, and in a second stage at a temperature not exceeding 750‹ C. until its weight remains constant. The inert filler may be quartz sand, quartz meal, coke, graphite powder, titanium dioxide, and heavy spar all of which may have a minor proportion of kaolinitic clay. Both the sodium silicate and the condensed aluminium phosphate may be rendered hydrophobic by treatment with a mineral oil. The composition may also contain an anionic or non-ionic surface-active substance, e.g. ethoxylated polypropylene glycol ethers, preferably in an amount of 0A05-3% by weight, calculated on the total weight of the mixture. The composition preferably comprises 10-30% by weight of solid watersoluble sodium silicate and 3-10% by weight of the condensed aluminium phosphate, calculated on the total weight of the composition, whilst the composition of the water-soluble solid sodium silicates used preferably fall within the range 27-18A5% by weight Na 2 O, 54- 62A5% by weight SiO 2 and 19% H 2 O.

Patent
03 May 1972
TL;DR: In this article, the authors defined the residual hydration ability (RHA) as the percentage weight loss on heating a dry sample of the hydrated material at 600 C. for 2 hours.
Abstract: 1,272,845. Mould linings; ingot moulds. FOSECO INTERNATIONAL Ltd. 2 March, 1970 [12 March, 1969; 8 Dec., 1969 (2)], Nos. 13063/69, 59822/69 and 59823/69. Heading B3F. [Also in Division C3] Ferrous metals are cast in an ingot mould whose walls or the base-plate thereof have been coated either with an aqueous liquid refractory dressing comprising particulate refractory material consisting of or including magnesia which particulate refractory material has a "residual hydration ability" of less than 4% by weight and, as binding agent, an alkali metal silicate or a refractory dressing precursor comprising the particulate refractory material previously specified and a solid alkali metal silicate. The percentage residual hydration ability of the material is defined as the percentage weight loss on heating a dry sample of the hydrated material at 600‹ C. for 2 hours. The magnesia should preferably have a low calcium oxide content and preferred magnesias are dead burnt magnesites. The particulate refractory material may also include alumina, titania or zircon whilst the magnesia may contain iron oxide as impurity. The alkali metal silicate used is preferably sodium silicate, most preferably sodium metasilicate. The amount of water used in the liquid dressings should preferably be sufficient to cause hydration of the alkali metal silicate to at least 10 H 2 O. When sodium silicate is used the magnesia and sodium silicate react in use to form the refractory magnesium silicate "forsterite". Optional ingredients specified are a Xanthomonas colloid suspension agent and a particulate suspending agent, e.g. bentonite.

Patent
16 Feb 1972
TL;DR: In this paper, a lithium ion-impregnated exchange resin with an aqueous solution of sodium silicate and recovering the lithium silicate-containing eluent is presented.
Abstract: 1,263,984. Lithium silicate. ESSO RESEARCH & ENG. CO. 28 May, 1969, No. 27026/69. Heading C1A. Water soluble lithium silicate is prepared by eluting.a lithium ion-impregnated exchange resin with an aqueous solution of sodium silicate and recovering the lithium silicate-containing eluent. The resin is an aryl compound -and includes cross-linked polymers of vinyl aromatic compounds and copolymers of styrene and pdivinyl benzene containing strong mineral -acid groups attached to the polymer. By continuation of the elution, lithium and sodium silicate compositions may be obtained. In an example a 10% solution of lithium sulphate is passed through an acidified resin comprising a sulphonated copolymer of styrene and divinyl benzene. The lithium ion impregnated resin is washed to neutral pH with water and eluted with a 5% solution of sodium -silicate to obtain an eluent containing lithium silicate. The resin -may be regenerated using the sulphuric acid formed during the treatment of the resin with the lithium sulphate.

Journal ArticleDOI
TL;DR: A comparatively high steam pressure should be used to give complete sodium silicate formation from the starting materials as discussed by the authors, and a higher steam pressure is required in the case of using sodium carbonate than on using sodium hydroxide.
Abstract: A comparatively high steam pressure should be used to give complete sodium silicate formation from the starting materials. Moreover, a higher steam pressure is required in the case of using sodium carbonate than on using sodium hydroxide. Sodium metasilicate hydrate prepared under a low steam pressure (2.5 atm)a appears to be amorphous in nature while that prepared from sodium hydroxide or sodium carbonate at a higher steam pressure is crystalline and very similar to the metasilicate hydrate with the formula Na2SiO3. 9H2O. However, the metasilicate prepared from sodium carbonate appears to be poorly crystalline due to the presence, in the prepared material, of an appreciable amount of sodium carbonate.