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Sodium dichromate

About: Sodium dichromate is a research topic. Over the lifetime, 421 publications have been published within this topic receiving 6202 citations. The topic is also known as: Disodium salt & sodium bichromate.


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Patent
04 Feb 1998
TL;DR: In this article, a combustion adjuvant for coal is presented, which is composed of boracic mud, carbide slag, limestone, iron ore dressing tailings, manganese dioxide, offscum resulted from production of potassium dichromate, bauxite, sodium hydroxide, sodium carbonate, sodium nitrate, sodium chloride and canebreak according to a certain mixing proportion.
Abstract: The present invention discloses a combustion adjuvant for coal. Said combustion adjuvant is composed of boracic mud, carbide slag, limestone, iron ore dressing tailings, manganese dioxide, offscum resulted from production of potassium dichromate, offscum produced in the course of production of sodium dichromate, bauxite, sodium hydroxide, sodium carbonate, sodium nitrate, sodium chloride and canebreak according to a certain mixing proportion. Said combustion adjuvant is applicable to several varieties of coal, including bituminous coal and anthracite coal etc., and can be added in clinker-sintering coal, and used for sintering clinker by substituing anthracite for high-quality bituminous coal.

5 citations

Journal ArticleDOI
TL;DR: In this article, a self-made electrosynthesis reactor composed of pure titanium and stainless steel, with a multiple-unit metal oxide combination anode, a stainless steel cathode, and a reinforcing combination cation exchange membrane, was used to produce sodium dichromate using an electrochemical synthesis method.
Abstract: In order to address the problems existing in the traditional production techniques for sodium dichromate, a new green technology for producing sodium dichromate using an electrochemical synthesis method was studied. Using a self-made electrosynthesis reactor composed of pure titanium and stainless steel, with a multiple-unit metal oxide combination anode, a stainless steel cathode, and a reinforcing combination cation exchange membrane, the kinetic experiments were carried out on the direct electrochemical synthesis reaction of sodium dichromate from sodium chromate. The kinetic data were experimentally measured at different temperatures and different initial sodium chromate concentrations of anolyte. The results show that the electrochemical synthesis process presents complicated zero-order reaction kinetic characteristics, with the reaction rate constant depending on the initial sodium chromate concentration. The macrokinetic equation of the electrochemical synthesis reaction was established, and some kinetic parameters were calculated. The apparent activation energy is less than that of the ordinary chemical reaction, and this shows that the electrochemical synthesis of sodium dichromate has great development potential.

5 citations

Patent
28 Apr 1954
TL;DR: In this article, a zinciferous surface is passivated by treating it with an aqueous acidulated solution containing 20-90 g/litre hexavalent chromium (calculated as CrO3), not less than 0.25 gram chloride (calculated as NaCl) for each gram of hexavalents chromium, and 0.9-1.8 g/literre complex fluoride (cal calculated as fluorine), said solution having a pH of 1.9 -2.8 and a temperature of 160 DEG -195 DEG F.
Abstract: A zinciferous surface is passivated by treating it with an aqueous acidulated solution containing 20-90 g/litre hexavalent chromium (calculated as CrO3), not less than 0.25 gram chloride ((calculated as NaCl) for each gram of hexavalent chromium (calculated as CrO3) and not less than 0.4 g/litre complex fluoride (calculated as fluorine), said solution having a pH of 1.9-2.8 and a temperature of 160 DEG -195 DEG F. and the treatment time being 2-10 seconds. Preferably, the solution contains chloride in an amount approximately equal to the hexavalent chromium, and 0.9-1.8 g/litre complex fluoride, and its pH may be adjusted by additions of sodium hydroxide or hydrochloric acid. The hexavalent chromium may be introduced as chromic acid or as a salt of chromic acid such as potassium chromate, sodium dichromate or ammonium chromate or dichromate, the chloride may be introduced as hydrochloric acid, sodium chloride or ammonium chloride, and as a source of complex fluoride may be used fluosilicic acid, fluoboric acid, fluozitconic acid fluostannic acid, fluotitannic acid or a soluble salt thereof. The process is stated to be particularly useful in the passivation of galvanized surfaces containing, for example, 4 per cent or more of aluminium. A final siccative finish of paint, lacquer, or japan may be applied to the passivated surface.

5 citations

Patent
Onizuka Masahiro1
18 Nov 1986
TL;DR: A nonflammable electrospark machining solution which provides a high machining rate composed primarily of a saccharide such as cane sugar, fruit sugar or malt sugar with the density of saccharides being 5 to 55% by weight is presented in this paper.
Abstract: A nonflammable electrospark machining solution which provides a high machining rate composed primarily of a saccharide such as cane sugar, fruit sugar or malt sugar with the density of saccharide being 5 to 55% by weight. A preservative may be added such as benzoic acid, salicylic acid, dehydroacetic acid or ethyl para-hydroxybenzoate with the latter being preferred in an amount of 0.01 to 0.1% by weight of the machining solution. Also, an anticorrosive such as sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine is preferably added in an amount of 0.05 to 0.1% by weight of the machining solution.

5 citations

Patent
28 Nov 2012
TL;DR: In this paper, a ternary composite chain scission solution was proposed to improve the chain scissoring and unblocking effects, maintain a long unblocked time, and enhance crude oil recovery.
Abstract: Belonging to fine chemical solutions, the invention relates to a ternary composite chain scission solution used for ternary composite flooding chain scission and unblocking as well as enhancement of crude oil recovery. According to a formula, the chain scission solution comprises by weight: 8%-10% of sodium lauryl sulfate, 3.5%-4% of potassium persulfate, 7%-8% of sodium dichromate, 9%-10% of an imidazoline inhibitor, 10%-12% of sodium hydroxide, 8%-10% of a ferric ion stabilizer, and the balance water. Compared with current common acidification, surfactants and other chemical blockage removal technologies, the chain scission solution not only can effectively improve the chain scission and unblocking effects, maintain a long unblocked time, enhance crude oil recovery, but also is a novel environment-friendly product with a pH value of 8 and without irritating smell and corrosion.

5 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20211
20201
201916
201817
20178
201617