Showing papers on "Sodium silicate published in 1984"

The nature of dissolved water in sodium silicate glasses and its effect on various properties

Abstract: Sodium silicate glasses with a wide range of water contents were prepared. For water contents up to twelve wt% the specimens were prepared by melting Na 2 O·3 SiO 2 glass and varied amounts of water in hydrothermal pressure vessels. A few higher water content samples were synthesized by hydrating glasses in an autoclave under a steam atmosphere. The concentration of different species of water was analyzed by infrared spectroscopy. Density refractive index and the induced absorption due to γ-irradiation were analyzed in terms of the different water species present in the glasses. It has been observed that the effect of water on all these properties can be explained in terms of the different contributions of hydroxyls and molecular water.

Process for the production of tablet form detergent compositions

Abstract: A process for the production of tablet form detergent compositions is afforded, comprising: (a) the partial hydration of from 10 to 60 parts by weight of an anhydrous sodium polyphosphate to form from 30 mole percent to less than 80 mole percent of tripolyphosphate hexahydrate; (b) mixing the partial hydrate with from 20 to 70 parts by weight of a powder-form, substantially anhydrous sodium silicate (Na 2 O: SiO 2 =1:1 to 1:4); (c) spraying the mixture with water or an aqueous silicate solution; and (d) granulation by agitation, followed by crystallization, other detergent ingredients optionally being added along with bleaches or enzymes, and adding from 1 to 5% by weight of sodium acetate or from 0.5 to 3% by weight of dicalcium phosphate dihydrate or a mixture thereof as a tableting aid, followed by tableting under a pressure of more than 70 kp/cm 2 , leading to mechanically strong, but rapidly dissolving tablet form detergent compositions.

Heat storage material

Abstract: The present invention relates to a heat storage material for air conditioning or for waste heat recovery, principally containing magnesium chloride hexahydrate which is doped as a nucleator with synthetic zeolite, magnesium silicate, sodium metasilicate, sodium silicate, calcium silicate, alumina, silicic anhydride, silicon carbide, calcium carbonate, or/and calcium fluoride, whereby the heat storage material can be effectively used over a long period of time.

29 Si n.m.r spectroscopy reveals dynamic SiO44–group exchange between silicate anions in aqueous alkaline silicate solutions

Abstract: Temperature dependent line broadening is observed in the 29Si n.m.r spectra of sodium silicate solutions which indicates dynamic exchange of SiO44– groups between different silicate anion species with the free SiO44– anion life time in the order of milliseconds.

Process for the production of a pourable anti-foamer preparation

Abstract: To produce homogeneous, readily-flowable granules having a content of (a) a water-insoluble anti-foamer active substance, preferably a silicon anti-foamer, an aqueous solution containing 0.5 to 8% by weight of cellulose ether is allowed to swell at temperatures of 15-60 DEG C until its viscosity is at least 75% of the final viscosity. The cellulose ethers (b) are composed of a mixture of carboxymethyl cellulose and methyl cellulose in the ratio 80:20 to 40:60. After mixing the anti-foamer and inorganic water-soluble or water-dispersible carrier salts (c), the solution is homogenised and spray-dried. The granular sprayed product contains 1 to 10% by weight of the component (a), 0.2 to 2% by weight of the component (b), 70 to 90% by weight of the component (c) and residual amounts of water. Sodium sulphate and/or sodium tripolyphosphate and mixtures thereof with sodium silicate preferably serve as carrier salts (c).

Heat capacity of sodium silicate liquids

Abstract: Drop calorimetry measurements for four Na20-Si02 liquids indicate that, to within ±0.5%, the heat capacities are temperature-independent between 900 and 1800 K and additive functions of composition for liquids containing from 50 to 100 mol% Si02. In this composition interval, the partial molar heat capacities of Si02 and Na20 are 81.37 and 100.6 J /mole-K, respectively.

One-component alkali metal silicate cement composition

Abstract: A dry one-component alkali metal silicate cement composition contains the following components: (a) condensed aluminum phosphate or condensed aluminum/iron phosphate as hardener in amounts between 2-10% by weight, (b) rounded quartz sand having a grain size between 0.01 and 0.5 mm in amounts of 30-70% by weight, (c) clay constituents in amounts of 10-40% by weight, (d) kieselguhr in amounts of 1-5% by weight, (e) mineral oil in amounts of 0.05-1% by weight and (f) solid pulverulent sodium silicate, potassium silicate or mixtures thereof in amounts of 10-25% by weight. The composition is free of surfactant. When combined with water the cement is slow to set into an acid-resistant mortar.

Process for manufacturing bentonite-containing particulate fabric softening detergent composition

Abstract: A fabric softening particulate synthetic organic detergent composition is made by mixing together a minor proportion of a finely divided bentonite powder and a major proportion of larger sized built synthetic organic detergent composition particles, spraying onto the surfaces of the moving mixture a dilute sodium silicate solution so that a small proportion of sodium silicate and a larger proportion of moisture are deposited on the mixing materials, and continuing mixing of the materials after cessation of the spraying of the silicate solution onto them.

The effective binary diffusivity of silica in sodium silicate melts: A review and recommendation

Abstract: Revue des informatons publiees sur la dissolution de la silice dans le verre fondu. On propose une equation de diffusivite de la silice dans une fonte de silicate de sodium en fonction de la temperature et de la teneur en silice

Process and composition for cementing wells passing through salt formations

Abstract: The present invention relates to a composition for cementing, containing a small amount of NaCl and from 35 to 150 l/t of sodium silicate. A cement-salt bond having good characteristics such as rheology, fluid loss, etc. . . . is obtained.

EXAFS Studies of Sodium Silicate Glasses Containing Dissolved Actinides

Abstract: Sodium silicate glasses containing dissolved Th, U, Np, and Pu have been studied using the EXAFS technique. Th4+, U4+, Np4+, and Pu4+ ions in the silicate glasses are 8-fold coordinated to oxygen neighbors. The. higher valent U6+ and Np5+ ions have complex local symmetries. The U6+ ions appear in a uranyl configuration with 2 oxygen atoms at 1.85A and 4 at 2.25A from the U ion. The Np5+ local symmetry is more complex and difficult to determine uniquely. The U6+ glasses show substantial clustering of the uranium atoms. A structural model, with nearly planar uranyl sheets sandwiched between alkali and silica layers, is used to. explain the U6+ EXAFS data. This model allows us to understand why U6+ ions are much more soluble in the glasses than the actinide 4+ ions.

Granular detergent compositions containing sodium aluminosilicate or other phosphorus-free detergency builders

Abstract: Granular detergent compositions containing sodium aluminosilicate or other phosphorus-free detergency builders with reduced caking and hygroscopicity tendencies are dis­ closed. The compositions contain not more than 4.5% sodium silicate and from about 0.3% to about 6.0% of polyethylene glycol or other polymers containing at least about 50% ethylene oxide by weight, the polymer having a melting point not less than about 35°C.

Detergent powders and processes for producing them

Abstract: The formation of poorly-dispersible material by interaction between sodium silicate and sodium aluminosilicate in a detergent powder can be reduced by acidification of the slurry prior to spray-drying. An acid in an amount equivalent to from 1.5 to 3 parts by weight of hydrogen chloride per 6 parts of sodium silicate of sodium oxide to silica ratio 1 to 1.6 is added to precipitate at least part of the silicate. Optionally, a powder-structurant is present.

Sodium silicate composition

Abstract: A mineralized sodium silicate solution for the application to wood has a composition causing it to penetrate the wood and jell within the wood so as to give the wood the non-burning characteristics of petrified wood.

Production of high purity silica gel

Abstract: PURPOSE: To produce a high-purity silica gel with simple operation, by mixing an aqueous solution of an alkali metal silicate with a mineral acid keeping the system to an alkaline state, and mixing the produced product with a mineral acid to keep the mixture to a strongly acidic state. CONSTITUTION: An aqueous solution of an alkali metal silicate is mixed with a mineral acid, and the pH of the mixture is maintained at ≥7 to obtain the primary silica gel. The aqueous solution of alkali metal silicate is prepared by diluting sodium silicate, etc. with water to a volume about 1.5W5 times the volume of the silicate (SiO 2 concentration of about 7W22wt%), and the mineral acid is e.g. about 4W6N sulfuric acid, etc. The produced primary silica gel having the form of a semi-transparent cake is mixed within about 24hr with a mineral acid same to or different from the acid in the above mixture, e.g. about 3W 8N sulfuric acid to keep the pH of the mixture to ≤1. The temperature of the system is maintained at about 60W95°C. The produced secondary silica gel is washed with a mineral acid and pure water to obtain a silica gel having a purity of ≥99.99wt%. COPYRIGHT: (C)1985,JPO&Japio

Raman spectroscopic study of scandium in sodium silicate glasses

Abstract: Glasses in the Na2OSiO2Sc2O3 system have been studied by Raman and difference Raman spectroscopy. Addition of Sc2O3 to sodium silicate glasses results in new vibrational bands at 1025 cm−1 and 360 cm−1. The high frequency band is interpreted to be due to Sc+3 quasi-complexes formed by Sc+3 ions coordinated by SiO4−4 tetrahedra having non-bridging oxygens. The discrete character of the scandium-produced bands implies incipient separation of Sc+3-enriched silicate structures from purely silicate structures.

Catalyst for synthesis of methanol

Abstract: PURPOSE:To provide a catalyst for synthesis of methanol high in activity and excellent in mechanical strength, obtained by a method wherein copper oxide, zinc oxide and silicon oxide are mixed and the resulting mixture is filtered, dried and baked CONSTITUTION:Sodium carbonate is added to an aqueous solution of a water soluble copper salt and a water soluble zinc salt (these salts are pref nitrate) as a precipitant to precipitate a copper component and a zinc component as insoluble solids In this case, the concn of each water soluble salt in the solution is about 01-1mol/l and the precipitant is used in an equivalent amount of 08 times with respect to the copper salt and the zinc salt A silicon component, for example, oxide obtained from sodium silicate is added to said copper and zinc components The resulting mixture is filtered, dried, and, thereafter, baked at about 300 degC or more under an oxygen-containing gaseous atmosphere to obtain a catalyst which is, in turn, ground to be molded by a tablet machine

Preparation of hydrated silicic acid having electrical conductivity

Abstract: PURPOSE:To produce electrically conductive hydrated silicic acid having white color resistant to discoloration at high temperature, by adding an antimony compound and a tin compound to a solution of an alkali silicate. CONSTITUTION:An antimony compound and a tin compound are added to a solution of an alkali silicate maintained at about 60-100 deg.C to prevent the gela tion, and the final pH of the mixture is adjusted to about 7-10 to obtain a silicic acid slurry. The objective electrically conductive silicic acid can be pre pared by the filtration, washing with water, drying, pulverization and classifica tion of the slurry. The alkali silicate is e.g. sodium silicate having an SiO2/Na2 molar ratio of about 1.5-3.1, and the concentration of the alkali silicate is about 2-10g/100ml. The antimony compound is e.g. antimony chloride, etc., and its amount is about 0.5-12wt% based on SiO2. The thin compound is e.g. tin chloride, etc., and its amount is about 40-100wt% based on SiO2. Both compounds are used by dissolving in water, alcohol, etc.

Production of zeolite Y

Abstract: The present invention relates to a process for producing a crystalline synthetic faujasite of the zeolite Y type wherein a relatively small amount of a zeolite Y seed is thoroughly mixed with sodium silicate at ambient temperature to form an activated sodium silicate system and to such activated system, sodium aluminate is added at ambient temperature. The mixture is then heated and reacted with stirring until the desired cyrstalline product is formed. Zeolite Y is filtered out and then dried.

Preparation of crystalline aluminosilicate

Abstract: PURPOSE:To prepare a fine crystalline aluminosilicate having excellent characteristics, by mixing a water-soluble silicate with a water-soluble aluminate in the presence of a specific acrylic acid oligomer, and crystallizing the resultant gel by hydrothermal treatment. CONSTITUTION:An aqueous solution of a water-soluble silicate such as sodium silicate having a concentration of 35-50wt% is mixed with an aqueous solution of a water-soluble aluminate such as sodium aluminate having a concentration of 35-70wt% at a ratio to obtain molar ratios (Na2O:Al2O3:SiO2:H2O) of (1.5- 2.0):1:(2.0-2.5):(15-30). In the above process, an acrylic acid oligomer having a molecular weight of 300-1,000 is added to the system and made to react at 60- 80 deg.C to cause gelation. The amount of the oligomer is >=0.2wt% based on the produced aluminosilicate. After the completion of gelation, the system is heated at 95-110 deg.C to effect the hydrothermal crystallization and obtain the suspension of crystalline aluminosilicate. A crystalline aluminosilicate having fine particle size and excellent characteristics as the builder for detergent can be prepared from the suspension.

Grout composition and stabilization of ground

Abstract: PURPOSE:To provide a grout composition which gels in a short time, contains a reduced amount of hardener and is easy to store and handle, consisting of an aqueous solution of sodium silicate and an aqueous dispersion of a mineral acid (hardener component) adsorbed by a porous carrier in fine powder. CONSTITUTION:The grout composition consists of an aqueous solution of sodium silicate and an aqueous dispersion of a mineral acid (e.g. sulfuric, hydrochloric or phosphoric acid) adsorbed by a porous carrier in fine powder (e.g. non-crystalline silica, diatomaceous earth or zeolite). The grout composition has a shorter gelling time than any conventional grout composition, and for a given gelling time, it may contain a smaller amount of a hardener component (mineral acid adsorbed by a porous carrier in fine powder). As the hardener component is in a wetted state or in powder, it can be packed in polyethylene, kraft paper bags, etc. for storage which are easy to handle.

Preparation of powdery raw material of silicon ceramic

Abstract: PURPOSE:To prepare fine powder of silicon ceramic raw material having high purity, easily, at a low cost, by reacting an alkali silicate with a mineral acid, mixing the obtained silica with carbon or a carbon compound, and calcining the mixture in a non-oxidative atmosphere. CONSTITUTION:An alkali silicate such as sodium silicate is mixed with a mineral acid such as sulfuric acid to obtain a mixture having an Si concentration of >=15wt%, and reacted under thorough agitation until the mixture becomes non- viscous liquid. The hydrogel thus obtained is filtered, washed with water, and dried to obtain highly pure silica. The silica is mixed with carbon such as carbon black and/or a carbon compound such as sucrose, and calcined at >=1,400 deg.C in reducing atmosphere or at <=1,600 deg.C in nitrogen gas atmosphere to obtain powdery raw material of ceramic composed of SiC or SiN. As an alternative method, the objective product can be obtained by reacting an alkali silicate with a mineral acid in the presence of a carbon source.

Manufacture of silica gel

Abstract: PURPOSE:To manufacture efficiently high-purity silica gel having a low water content with a compact equipment in a short time, by blending an alkali silicate with a mineral acid so that SiO2 is incorporated at a specified concn. or above and by reacting the blend while violently stirring it. CONSTITUTION:An alkali silicate such as sodium silicate is blended with a mineral acid such as sulfuric acid so that SiO2 is incorporated by >=15wt%, preferably about 20-30%, and the blend is stirred with a mixer which applies strong shearing force such as a kneader. The charged starting material is first converted into lumps like lumps of ice, and in accordance with the progress of stirring, it becomes a nonsticky liq. state through a sleety state and the state of sticky rice cake. The reaction is finished in about 1hr. The reaction product is filtered and washed in water to obtain silica gel of hydrogen having <=about 60% water content. The silica gel can be dried with a small quantity of heat according to demand because of the low water content. The specific surface area of the silica gel can be controlled in some degree by regulating the pH of the starting material and the reaction temp.

Inorganic zinc paint composition

Abstract: PURPOSE:To provide a paint compsn. which does not need mist coating and makes it possible to carry out thick-wall coating, by blending zinc powder and a flake pigment with a paint base compsn. contg. a silicate spreader. CONSTITUTION:An inorg. zinc paint compsn. is obtd. by blending zinc powder and a flake pigment with a paint base compsn. contg. an alkyl silicate such as ethyl silicate and/or an alkali metal silicate such as sodium silicate as spreader. When a coating film is formed by using this paint compsn., zinc powder and the flake pigment are selectively distributed in the coating film 8 so that zinc powder 9 is distributed in the lower layer of the film, the flake pigment 10 is distributed in the upper layer thereof and part of the flake pigment 10 is incorporated in the lower layer composed of zinc powder. When the surface of the so- formed film 8 of the inorg. zinc paint compsn. is coated with an org. paint, the solvent thinner of the org. paint can not reach the voids 7 of the film 8 by the liquid barrier action of the flake pigment so that there is no possibility of forming bubble, pinhole or crater caused by the replacement of gas within the voids with the thinner.

Production of silicic acid

Abstract: PURPOSE:An alkali metal silicate is made to react with a specific metal salt under a strong shear force and the resultant silicate salt is treated with an acid to enable the production of silicic acid with a large specific surface area and a sharp particle size distribution. CONSTITUTION:The reaction between an aqueous solution of an alkali metal silicate having a SiO2/R2O molar ratio (R is an alkalie metal such as sodium) of 1-3.4, such as sodium silicate and at least one selected from chlorides and sulfates of metals in group IIA, IIIB, VIII such as Mg, Ca or Al is carried out under a strong shear force in a colloid mill so that M/R2O becomes 1-1.3 where M is the equivalent of the above metal salt. An acid such as sulfuric or hydrochloric acid is added to the resultant silicate slurry to adjust the pH to give the objective silicic acid with very fine particle sizes and a sharp particle size distribution. It is filtered, washed and dried to the product.