35results about "Chromium halides" patented technology

Disclosed is an aqueous solution of a chromium salt, in which the oxalic acid content is 8% by weight or less relative to chromium. In the aqueous solution of the chromium salt, the total organic carbon content is 4% by weight or less relative to chromium. The chromium salt is preferably a chromium chloride, a chromium phosphate, or a chromium nitrate. The chromium chloride preferably contains a basic chromium chloride represented by the composition formula Cr(OH)_xCl_y (wherein 0<x≦2, 1≦y<3, and x+y=3). The chromium phosphate is preferably one represented by the composition formula Cr(H_3−3/nPO₄)_n (wherein n is a number satisfying 2≦n≦3). The chromium nitrate is preferably a basic chromium nitrate represented by the composition formula Cr(OH)_x(NO₃)_y (wherein 0<x≦2, 1≦y<3, and x+y=3).

The invention relates to a process for preparing chromic anhydride and dichromate by a carbon ferrochrome liquid phase method and belongs to the technical field of preparation of chromic compounds, ferrum-series pigments, silicone new materials, photovoltaic new materials and new-energy chemical-industry new materials from industrial metallurgical products. The process disclosed by the invention is advanced, energy-saving and environment-friendly and is free of emission of waste residues, waste gases and waste water. Products such as the chromic compounds, the pigments, new energy sources and new-energy-source silicon-carbon battery materials are produced from ferrochrome by a liquid phase method in one time without high pressure and high temperature, so that a series of novel high-end industry chains are formed, and the original situation that the ferrochrome is single in use and pure in production is thoroughly changed; the out-of-date production process that heavy pollution generated by the original chromate compound roasting production heavily harms environment is changed, and the production of chromic anhydride, dichromate and the chromic compounds can be in a energy-saving, environment-friendly and high-benefit development path; and the field of diversified development and application of ferrochrome industry is extremely extended, the international competitiveness of enterprises is greatly enhanced, and the optimized upgrading and developing of national industries are promoted, so that the process is of far reaching importance. The process meets the modern requirements on environment-friendly development of economy and has very good enterprise economic benefit, perfection benefit and social benefit.

The invention discloses a production method of chromic chloride hexahydrate, which comprises the following steps that chromic anhydride is added to a reaction vessel; water with 60-80% of the mass of chromic anhydride is added for dissolving chromic anhydride; alcohol with 10-20% of the theory quantity is slowly added for prereducing chromic anhydride; hydrochloric acid with 1.1-1.3 times the theory quantity and residual alcohol with 90% of the theory quantity are uniformly mixed, and then slowly added to the reaction vessel; stirring and reaction are performed for 1h; a reacted material is evaporated and concentrated until a concentration reaches 45 baume; after the concentration of the material is qualified by evaporation, heating is stopped; natural cooling to a room temperature is performed; crystallization is performed for 8h in a slow stirring state; after the material is crystallized, a chromic chloride hexahydrate product is obtained by centrifugal separation; a mother solution is collected, returns to an evaporation system, and is continued to be condensed; and the product is crystallized and separated again. The method is clean in production, environment-friendly in product and simple in technology; and chromic chloride hexahydrate can replace heavy-pollution hexavalent chromic salt, is widely applied to the industries of electroplating, mordanting, catalysts and the like, and is a revolution of chromic salt development.

The invention discloses a production method for the coproduction of chromium chloride and chromic carbonate, and the production method is used for solving the problems that the chromic carbonate produced through the existing method is easy to age, and the solubility of the chromic carbonate in acidic aqueous solutions is greatly reduced after the chromic carbonate is subjected to long-term storage. According to the production method, an alkaline solution of sodium chromate is taken as a raw material, sulfur and alkali sulfide are taken as reducing agents to be subjected to redox reaction in a reaction tank so as to obtain chromic hydroxide, the obtained chromic hydroxide is filtered and washed and then reacts with hydrochloric acid to produce the chromium chloride, and the chromic carbonate is produced in a manner that the chromium chloride is subjected to the precipitation of a soda solution. The production method has the advantages that the process flow is short, the operation is simple, the redox reaction is complete, the chromium yield is high, and hexavalent chromium is not detected in the filtrate, so that the pollution to the environment cannot be caused.

The invention relates to a carbon ferrochrome liquid phase method for preparing a new energy battery raw material and a new energy source hydrogen process. The process is advanced, energy saving and environmentally friendly, free from fire coal and high temperature and high pressure, the new energy source, a plurality of new energy source battery materials, pigments, chemical engineering chromium salt and the like products can be produced in disposable by using ferrochrome as the raw material by using the liquid phase method, a series of new high-end industry chains are formed, the situations that the original product use is single in use and the production is pure are changed, the enterprise international competitiveness is greatly enhanced, the upgrading and optimization and development of the nation industry are promoted, and the process has important significance.

The invention discloses a separating method for chromium and iron in a hydrochloric acid system. The separating method comprises the following technology steps that firstly, a chromic chloride and ferrous chloride mixed solution is obtained through carbon ferrochrome leaching via hydrochloric acid, all Fe<2+> is oxidized into Fe<3+> through hydrogen peroxide firstly, then an extraction agent is added for extraction according to the content of iron in the solution and the proper phase ratio, a water phase obtained after extraction is a chromic chloride solution, reextraction is conducted on an organic phase through water, a ferric chloride solution and an extraction agent are obtained, and the extraction agent is circularly used; secondly, chromic chloride crystals are obtained from the chromic chloride solution via a direct crystallization method, chromic hydroxide can be prepared through an alkali adding neutralization and sedimentation method as well, the chromic hydroxide is then subjected to high-temperature roasting, and chromic oxide is obtained; and thirdly, the ferric chloride solution can be directly used as a water purifying agent, ferric hydroxide can be prepared through the alkali adding neutralization and sedimentation method, the ferric hydroxide is subjected to high-temperature roasting, and iron oxide red pigment is obtained. The technology is simple, operation is easy, and the iron removal rate reaches up to 99.95% or above.

The invention relates to a one-off manufacturing technology of chromium compounds and new products in many industries by a liquid phase method of ferrochromium and belongs to the technical field of new chemical materials with metallurgical products used as raw materials to manufacture chromium compounds, iron series pigments, new silicon materials, new photovoltaic materials and new energy. The technology provided by the invention is advanced, energy-saving and environmentally friendly, and there is no discharge of waste residues, exhaust gas or wastewater. High temperature and high pressure are not required. Ferrochromium is used as a raw material to produce products such as chromium compounds, pigments, new energy, new silicon carbon battery materials and the like by a liquid phase method at a time, thus forming a series of new high-end industrial chains and thoroughly changing situations of single application and pure production of ferrochromium in the prior art. The backward production technology that original chromate compound roasting production generates high pollution which is greatly harmful to the environment is changed. Production of chromate compounds has embarked on an energy-saving and high-efficiency development road. Diversified development and application fields of the ferrochromium industry are greatly expanded, international competitiveness of enterprises is greatly enhanced and national industrial upgrading and optimization and development are promoted. The technology provided by the invention is of great significance. The technology accords with requirements of modern green economic development and has great enterprises economic benefits, perfection benefits and social benefits.

The invention relates to a method for improving the quality of industrial chromic chloride. The method comprises the following steps: adding industrial chromic chloride as a raw material into high purity water for dissolving; carrying out membrane filtration on a dissolving solution by a modified kynoar polyvinylidene fluoride membrane to obtain a filtrate in which metal ion impurities are removed; removing water and cooling under normal pressure; drying a separated crystal to obtain chromic chloride with improved quality. Through detection, the purity of chromic chloride reaches 99.5% or more and meets the quality standard of HG3-935-81. The method is good in effect of removing the metal ion impurities, and an obtained chromic chloride product has stable quality and is suitable for industrial production.

The invention discloses a system and a method for producing a high-purity energy storage material for liquid flow batteries by using high chromium type vanadium residue. According to the present invention, through selective chlorination in a circulating fluidized bed, vanadium, chromium and iron in high chromium vanadium residue are converted into corresponding gaseous chlorides, and most of impurities such as manganese, titanium, silicon and the like in the vanadium residue are remained in the chlorinated residue so as to separate the valuable elements from other impurities; the gaseous chloride is subjected to high temperature dust collection to separate crude chromium trichloride, is subjected to medium temperature dust collection to separate crude ferric chloride, and is subjected to low temperature leaching to separate crude vanadium oxytrichloride; the crude chromium trichloride is subjected to volatilization purification to obtain high-purity chromium trichloride; the crude ferric chloride is subjected to volatilization purification to obtain high-purity ferric chloride; the crude vanadium oxytrichloride is subjected to rectification purification and catalytic oxidation to obtain high-purity vanadium pentoxide powder; and with the system and the method, the high-value comprehensive utilization of the high chromium type vanadium residue is achieved, and the high-purity energy storage material for liquid flow batteries is obtained through the one-step chlorination multi-stage recovery method.