![]() ![]() Chromium (III) acetate is used to fix certain textile dyes, to harden photographic emulsions and as a catalyst. More specifically, chromium (III) oxide is used as a paint pigment, a fixative for certain textile dyes and as a catalyst. ![]() Chromium (III) compounds are employed as pigment, as catalyst, as tanning agent in the tanning industry, in the production of pure chromium metal and chromium (VI) compounds, and in the production of refractory bricks. More applications are in the photographic industry (sensitiser), in industrial water treatment (including treatment of cooling tower water), as medicinal astringents and antiseptics, and in nuclear and high temperature research. protective coatings for automotive and equipment accessories), as dyes, as inorganic paint pigments, for leather tanning, as fungicides and wood preservatives, and as catalysts. Chromium compounds are used for chrome plating (e.g. according to claims 1 described method, it is characterized in that described preparation method is a raw material with the analytical pure chromic anhydride, use a certain amount of water dissolution, slowly add the sulfuric acid that the reaction First Astronautic Research Institute for Measurement and Test needs, dropwise add formaldehyde under 90~100 ℃ of water-baths, magnetic agitation, it is excessive 80% that the consumption of formaldehyde is controlled to be 180% of reaction metering Dropwise the back and continue heating 10 minutes, make the chromic anhydride reduction fully.Chromium metal is used as an alloying element to harden steel and to manufacture stainless steel. ![]() Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Guilin University of Technology filed Critical Guilin University of Technology Priority to CN 200510053373 priority Critical patent/CN1298635C/en Publication of CN1718545A publication Critical patent/CN1718545A/en Application granted granted Critical Publication of CN1298635C publication Critical patent/CN1298635C/en Status Expired - Fee Related legal-status Critical Current Anticipated expiration legal-status Critical LinksĬhromium sulphate is a kind of main raw material in the trivalent chromium electrodeposited chromium, and environmental pollution is less, reaction conditions is gentle, electrolytic efficiency causes people's very big concern than advantages such as height owing to it has.But because the chromium sulphate price is higher, and market supply deficiency.And chromic anhydride purity height, ample supply of commodities on the market, price is cheaper, thereby obtains trivalent chromium source can yet be regarded as a kind of economy, method fast and efficiently with reduction chromic anhydride method.At present, reduction chromic anhydride reductive agent commonly used has FeSOĢ, hydrazine hydrate, sucrose, methyl alcohol etc.But these method of reducing often exist introducing harmful ion, reaction to be difficult to control, use the defectives such as gas that environment had pollution, are difficult to satisfy the requirement in electrodeposited chromium source.The method research for preparing chromium sulphate about formaldehyde reduction chromic anhydride is not reported.Ģ. Original Assignee Guilin University of Technology Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) ![]() ( en Inventor 钟福新 杜荣斌 李晓菲 Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number CN 200510053373 Other languages Chinese ( zh) Google Patents CN1298635C - Method of preparing chromium sulphate CN1298635C - Method of preparing chromium sulphate ![]()
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