67results about "Chromium sulfates" patented technology

A method for the synthesis of compounds of the formula C-LixM1-yM'y(XO4)n, where C represents carbon cross-linked with the compound LixM1-yM'y(XO4)n, in which x, y and n are numbers such as 0<=x<=2, 0<=y<=0.6, and 1<=n<=1.5, M is a transition metal or a mixture of transition metals from the first period of the periodic table, M' is an element with fixed valency selected among Mg<2+>, Ca<2+>, Al<3+>, Zn<2+> or a combination of these same elements and X is chosen among S, P and Si, by bringing into equilibrium, in the required proportions, the mixture of precursors, with a gaseous atmosphere, the synthesis taking place by reaction and bringing into equilibrium, in the required proportions, the mixture of the precursors, the procedure comprising at least one pyrolysis step of the carbon source compound in such a way as to obtain a compound in which the electronic conductivity measured on a sample of powder compressed at a pressure of 3750 Kg.cm<-2 >is greater than 10<-8 >S.cm<-1>. The materials obtained have excellent electrical conductivity, as well a very improved chemical activity.

A method of preparing metal chalcogenides from elemental metal or metal compounds has the following steps: providing at least one elemental metal or metal compound; providing at least one element from periodic table groups 13-15; providing at least one chalcogen; and combining and heating the chalcogen, the group 13-15 element and the metal at sufficient time and temperature to form a metal chalcogenide. A method of functionalizing the surface of semiconducting nanoparticles has the following steps: providing at least one metad compound; providing one chalcogenide having a cation selected from the group 13-15 (B, Al, Ga, In, Si, Ge, Sn, Pb, P, As, Sb and Bi); dissolving the chalcogenide in a first solution; dissolving the metal compound in a second solution; providing and dissolving a functional capping agent in at least one of the solutions of the metal compounds and chalcogenide; combining all solutions; and maintaining the combined solution at a proper temperature for an appropriate time.

The present invention includes pure single-crystalline metal oxide and metal fluoride nanostructures, and methods of making same. These nanostructures include nanorods and nanoarrays.

The present invention relates to a method for preparing an electroactive metal polyanion or a mixed metal polyanion comprising forming a slurry comprising a polymeric material, a solvent, a polyanion source or alkali metal polyanion source and at least one metal ion source; heating said slurry at a temperature and for a time sufficient to remove the solvent and form an essentially dried mixture; and heating said mixture at a temperature and for a time sufficient to produce an electroactive metal polyanion or electroactive mixed metal polyanion. In an alternative embodiment the present invention relates to a method for preparing a metal polyanion or a mixed metal polyanion which comprises mixing a polymeric material with a polyanion source or alternatively an alkali metal polyanion source and a source of at least one metal ion to produce a fine mixture and heating the mixture to a temperature higher than the melting point of the polymeric material, milling the resulting material and then heating the milled material. It is another object of the invention to provide electrochemically active materials produced by said methods. The electrochemically active materials so produced are useful in making electrodes and batteries.

An antibacterial agent composed of silver-containing aluminum sulfate hydroxide particles represented by the following formula (X-I) or (Y-I).

(Ag_aB_b-a)_bAl_cA_x(SO₄)_y(OH)_z.pH₂O  (X-I)

[Ag_aB_b-a]_b[Ti_3-cAl_c](SO₄)_y(OH)_z.pH₂O  (Y-I)

The above antibacterial agent of the present invention provides antibacterial molded articles and further antifungal agents, cosmetics, antibacterial paper, antibacterial deodorizing sprays and agricultural chemicals when it is mixed with a resin.

The preparation process of chromium subsulfate with chromite as material includes grinding; reacting with sulfuric acid at 110-170deg.c via stirring and under the presence of catalyst for 1-8 hr; filtering to separate filtrate and slag silica; regulating the free acid value of the filtrate with alkali to 0.8-3.1 %, adding crystal seed calcium salt, magnesium salt or chromium oxide and ferric oxide under stirring at 130-190 deg.c for 30-120 min; filtering to eliminate iron-containing slag, neutralizing the filtered mother liquid with sodium carbonate to base content of 33 %, and drying the mother liquid to obtain product chromium subsulfate; with the iron-eliminating filtered slag being produced into iron oxide red via conventional technological process. The said process is short, exhausts no toxic effluent, no slag and no waste gas, and has no environmental pollution.

The invention discloses a method for preparing chromium sulfate basic by utilizing residual liquor obtained during menadione production. The method comprises the following steps: uniformly mixing the concentrated residual liquor with industrial sugar according to a certain molar ratio, and reacting in a pressure reactor for 0.5-4 hours at the temperature of 100 to 300 DEG C under the pressure of 0 to 4MPa; completely reducing a small amount of unreacted hexavalent chromium in the feed liquid into trivalent chromium by using a reducing agent after the reaction is ended; regulating the basicity of the feed liquid by using an alkaline solution, filtering, performing spray drying on the filtrate, thus obtaining the chromium sulfate basic product. According to the method disclosed by the invention, a pressure-conditioned curing reaction is adopted, residual organic matters in the menadione residual liquor can be effectively removed, and the quality of chromium powder is improved. The method disclosed by the invention is simple in process, high in reaction rate, low in energy consumption, clean and environment-friendly.

The invention provides a method for separating chromium ions and iron ions in a multicomponent solution, comprising the following steps of: with a mixed solution of chromic sulfate and ferric sulfate, generated by leaching out chromite by using sulfuric acid, as a raw material, adding an extractant to carry out extraction; obtaining an inorganic phase of a chromic sulfate solution and obtaining organic phases of the extractant and the ferric sulfate after extraction; then carrying out back extraction on the organic phases by using a sodium hydroxide solution and regulating a pH value to be 9-10 to obtain ferric hydroxide, a sodium sulfate solution and an extractant; recycling the extractant, and preparing the chromic sulfate by utilizing the extracted chromic sulfate solution and adopting a direct crystallization method; and preparing iron oxide red pigment by utilizing the ferric hydroxide as a raw material through a high-temperature crystallization method. Compared with the traditional technology for removing iron from the mixed solution of the chromic sulfate and the ferric sulfate, the invention has the most remarkable advantages that a process flow is short without three waste emission and extractant is recycled. Iron oxide red as a by-product does not contain hexavalent chromium and can be applied to industries of buildings, coatings, vehicles and the like.

The invention relates to a method for utilizing a chrome-vanadium solution to produce a vanadium product and chromium sulfate basic. Through the steps of hydrolysis vanadium depositing, a calcification reaction, enriching of chrome, preparing of chromium sulfate basic and the like, a high-purity vanadium product and a chromium sulfate basic product are obtained, the concentration of the obtain vanadium product can reach 99.5% or above, the content of Cr2O3 in chromium sulfate basic can reach 24-26%, the content of a sundry Fe is smaller than 0.1%, the recovery rate of chrome and vanadium can reach 99.5% or above, and the purposes of efficiently extracting and separating chrome and vanadium are achieved. The production process is clean, saline water and NaOH mother liquor generated in the preparing process can return to a system for use, and no ammonia-nitrogen wastewater is generated in the whole process. The technology is feasible, the equipment is simple, the production cost is low,the automation is easy to implement, the economic benefit is high, and the application prospect is good.

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 relates to a method for preparing basic chromium sulfate by using vanadium extraction chromium slag, which adopts vanadium extraction chromium slag as raw materials; certain amounts of water and sulfuric acid are added; and the basic chromium sulfate is prepared by steps of reaction, curing, filtration, vacuum concentration, drying, and the like. The Cr2O3 content in the product is stabilized at 27%; the basicity is 30%-45%; the iron content is less than 0.1%. The whole process of the invention is short in flow, causes no discharge of toxic waste water, waste residues, and waste gas, and solves the problem of environment harm in the prior art.

The invention relates to a clean, energy-saving and environment-friendly chromium compound manufacturing technology by utilizing carbon ferrochrome. The clean, energy-saving and environment-friendly chromium compound manufacturing technology disclosed by the invention is advanced, energy-saving and environment-friendly, fuel coal, high temperature and high pressure are not needed, products such as chromium compound, pigment, new energy and silicon carbon battery new materials can be produced in one time by taking ferrochrome as a raw material and adopting a liquid phase method, a series of new high-end industry chains can be formed, and the situations of single application and simple production of original products can be completely changed; a backward production technology which can generate high pollution during original chromate compound production and has great harm to the environment can be changed, and an energy-saving, environment-friendly and high-efficiency development way is guided for chromium compound production; the diversified development and application field of ferrochrome industry are greatly expanded, the international competitiveness of enterprises is greatly enhanced, and important significance is obtained in promoting the optimization, the upgrading and the development of national industries.

The invention discloses a method for preparing basic chromium sulfate from chromium-contained wastewater. The method includes: adding excessive oxidizing agent into the chromium-contained wastewater to heat the chromium-contained wastewater up, adding alkaline liquor to adjust the pH (potential of hydrogen) value to be alkaline, filtering to remove heavy metal sediments in the chromium-contained wastewater, adding sulfuric acid into obtained filter liquor to adjust the pH value to be acidic, and adding oxalic acid till a chromium sulfate solution is obtained; adding alkaline liquor into the chromium sulfate solution with stirring so as to react to obtain syrup type viscous liquid, cooling to crystallize, centrifuging to obtain liquid basic chromium sulfate, and subjecting the liquid basicchromium sulfate to concentrating, washing, drying, smashing and screening to obtain solid basic chromium sulfate. According to the method, minute amount of heavy metal ions is removed by extracting principal components in the chromium-contained wastewater, and suitable conditions are furtherly chosen to prepare the basic chromium sulfate finally. The method for preparing the basic chromium sulfate from the chromium-contained wastewater is simple in technology, low in cost and high in product yield, and is not only capable of providing a new technical solution for recovery of the chromium-contained wastewater, but also is capable of preparing the basic chromium sulfate which is stable in state, high in purity and less in impurities.

The invention provides a new method for recycling vanadium, iron and chromium elements from vanadium and chromium-containing sludge. The method comprises the steps of completely migrating valuable metal elements in the vanadium and chromium-containing sludge into leaching solutions with an enhanced leaching method by taking sulfuric acid as leaching agents, and then performing iron and vanadium removal treatment at high temperature under high pressure to obtain relatively pure chromium sulfate solutions; performing drying treatment to the chromium sulfate solutions to obtain chromium sulfate products; alkaline-leaching iron and vanadium removal products to obtain ferric hydroxide and sodium vanadate solutions; and crystallizing the sodium vanadate solutions to obtain sodium vanadate products, and preparing iron oxide red products through high temperature drying of the ferric hydroxide. The new method is high in resource utilization rate, has no three-waste discharge problem, and is a clean and resource recovery new production technology.

The invention discloses a method for producing basic chrome sulphate with dichromiumtris (chromate) slag. The method for producing basic chrome sulphate with the dichromiumtris (chromate) slag comprises the following steps of completely dissolving the dichromiumtris (chromate) slag with concentrated sulfuric acid, that is, adding 1.93t sulfuric acid per ton of Cr2O3 according to a Cr2O3 content in a raw material, adding 0.37-0.42t urea per ton of Cr2O3 to prepare a 10% urea solution and a 50% sodium bichromate solution, slowly adding the prepared urea solution and the sodium bichromate solution into acid soluble dichromiumtris (chromate) slag slurry, heating the slurry to be boiled, performing continuous reaction for 2-3h, filtering the reacted slurry, and after alkalinity of liquid basic chrome sulphate is detected to be qualified, obtaining a basic chrome sulphate finish product through a spray dryer. The method takes the waste dichromiumtris (chromate) slag as a raw material, is environment-friendly, saves resources, reduces unit consumption, produces obvious economic benefits, and provides an energy-saving, environment-friendly and synergetic novel production technology.

The invention discloses a method and device for producing a chromium tanning agent by using oxidized waste liquid obtained from S wax production. The method comprises the steps of carrying out acidification and two-stage oxidation on raw materials, namely lignite wax, sodium bichromate, chromic anhydride (chromium trioxide, CrO3) and sulfuric acid, so as to obtain the oxidized waste liquid; treating the oxidized waste liquid by using glucose serving as a reducing agent in a manner that glucose cooperates with sodium bichromate, so as to obtain a chromium tanning solution; drying and dewatering the chromium tanning solution, thereby obtaining the chromium tanning agent. The device comprises an oxidized waste liquid storage tank, an oxidized liquid reduction device, a chromium tanning agent recovery device, a high-position liquid supplying device and a supporting liquid distribution device. According to the method, the chromium tanning agent (alkaline chromic sulfate-chromium powder tanning agent) is prepared through reducing the chromium-containing oxidized waste liquid, formed during the production of S wax from lignite wax, by using glucose which cooperates with sodium bichromate, and tanned leather is plump, soft and elastic. According to the method and the device, the process is simple and energy-saving, the consumption of sulfuric acid and glucose is low, and the device is easy to implement, so that the large-scale, continuous and automated production can be realized.

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 method for producing basic chromic sulfate by utilizing tannery waste chromium mud. The method comprises the following steps: airing and drying waste chromium mud, uniformly mixing the dried chromium mud and sodium hydroxide in a rotary kiln, and adding an oxidant for roasting; performing water circulation suction filtration washing on the roasted materials, and removing impurities, thereby obtaining a sodium chromate solution; adding sulfuric acid into the obtained solution for reacting, thereby obtaining sodium dichromate; continuously adding sulfuric acid for reacting, slowly adding cane sugar, and reacting, thereby obtaining liquid basic chromic sulfate; and finally, drying the basic chromic sulfate solution, thereby obtaining the powdered basic chromic sulfate. According to the technical scheme of the invention, the waste chromium mud is fully utilized, and changed into valuable things to be recycled, and the resources and the energy are saved. The problem of chromium pollution in tannery industry is solved, and the tannery cost can be reduced. The chromium pollution is solved, and meanwhile, the economic benefits and social benefits of enterprises are obviously improved.

The invention discloses a method for preparing basic chrome sulphate by magnochromite sulphuric acid leaching solution, which belongs to the technical field of mineral processing. The method disclosed by the invention comprises the following steps of: adjusting the temperature of the magnochromite sulphuric acid leaching solution to 40-90 DEG C and keeping the temperature constant, adding excessive iron chips or iron powder and continuously stirring, and stopping heating and stirring after Fe<3+> is not contained in the reaction solution; filtering and taking the filtrate, and recycling the remainder iron chips; adjusting the pH value of the filtrate to an interval from 1 to 4 by basic solution, slowly adding oxalic acid solids with an amount which is 1.0-1.8 times of amount of substance of a theoretical value, controlling the pH value of the solution, and always keeping the pH value in an interval of an initial level +/-0.5; after adding, continuing to stir for 5-20 minutes, filtering to obtain the residue of metal oxalates, adding the basic solution in the filtrate to neutralize, adjusting until the basicity is 33+/-1%, and drying the mother solution to obtain basic chrome sulphate. The method disclosed by the invention is capable of removing iron and magnesium in the magnochromite sulphuric acid leaching solution simultaneously in a reactor, thus reducing process flow, saving equipment space, and achieving low cost and no Cr(VI) generation.