31results about How to "Reduce break down cost" patented technology

The invention relates to a method for extracting wolfram through pressurizing and decomposing of wolframite or scheelite and wolframite mixed ore by sulfuric and phosphoric mixed acid. Main improved points of the method lie in that in the process of extracting wolfram from the wolframite or the scheelite and wolframite mixed ore through a phosphoric acid and sulfuric acid mixture, a reaction system is subjected to pressurizing treatment, so that the temperature is 110-250 DEG C. Through pressurizing, the wolfram in the wolframite or the scheelite and wolframite mixed ore can be directly extracted without adding of calciferous compounds to convert the wolframite during wolfram extracting, the production procedure is simplified, and the production cost is reduced.

The invention relates to the field of emission reduction and conversion of carbon dioxide, in particular to a trapping and pyrolysis method for carbon dioxide. The carbon dioxide in smoke is converted into a sodium bicarbonate solution by a sodium carbonate solution in a carbonizer, and a pyrolyzer resolves high-purity carbon dioxide quickly. The pollution due to excessive carbon dioxide generated when fossil fuel is burnt is avoided, and energy conservation, environmental protection, energy crisis reduction and greenhouse effect reduction are realized. The method has the benefits that (1) the trapping rate of the carbon dioxide is significantly increased by the synergistic action of sodium carbonate, a catalyst and an activating agent; (2) the solution decomposes the carbon dioxide quickly, and the dissociation cost is lowered; and (3) the equipment investment is low, a large amount of carbon dioxide can be trapped and pyrolyzed, near zero release of the carbon dioxide can be realized, and the method is suitable for key coal-consumption industries of coal power, coal chemistry, steel, cement, papermaking, metallurgy, printing and dyeing, chemical engineering and the like to trap, recover and apply carbon dioxide resources on a large scale, and reduces the greenhouse effect.

The invention relates to a method for preparing tungsten oxide and tungsten powder by acid decomposition of scheelite. With the scheelite as raw materials, the method comprises the following steps: (1) the leaching reaction is performed; (2) the filtration washing is performed; (3) hydrogen peroxide is extracted; and tungsten is decomposed and extracted; (4) the hydrogen peroxide is dissolved by multiple times; and tungsten acid is decomposed and purified; (5) tungsten trioxide is prepared through calcining of pure tungsten acid; and (6) tungsten acid peroxide solution is sprayed and pyrolyzedto prepare the tungsten oxide and the tungsten powder. The method consumes no hydrochloric acid or nitric acid, and only consumes cheap and easy-obtained sulfuric acid, so that the scheelite decomposition cost is greatly reduced; the acid decomposition is adopted; decomposition slag is gypsum, and can be used as construction materials; dangerous and waste alkali boiling slag is not generated, sothat the enterprise production and operation cost is greatly reduced; the hydrogen peroxide is adopted as an extracting agent of the tungsten acid, so that ammonia and nitrogen waste water is not generated, a process for generating the ammonia and nitrogen waste water for tungsten smelting by many years is abolished, and the environmental protection cost is greatly reduced; and various tungsten terminal products and the tungsten powder are directly prepared, so that the product additional value of tungsten smelting enterprises is improved.

The invention relates to a method for preparing tungsten products through acid decomposition of wolframite and scheelite mixed ore. The wolframite and scheelite mixed ore serves as a raw material in the method, the method comprises the following steps that firstly, the leaching reaction is conducted; secondly, filtering and washing are conducted; thirdly, hydrogen peroxide extraction-decompositionare conducted for tungsten extraction; fourthly, multi-time hydrogen peroxide dissolving-decomposition are conducted for tungstic acid purification; fifthly, tungsten trioxide is prepared through pure tungstic acid roasting; and sixthly, a peroxotungstic acid solution is subjected to spray pyrolysis, and tungsten oxide and tungsten powder are prepared. According to the method, only the cheap sulfuric acid easy to obtain is consumed, and the wolframite and scheelite mixed ore decomposition cost is greatly reduced; the sulfuric acid is adopted for decomposition, decomposition slag is gypsum andcan be used as building materials, dangerous waste alkali boiling slag is not generated, and the enterprise producing and operating cost is greatly reduced; hydrogen peroxide is adopted as an extraction agent for tungstic acid, ammonia-nitrogen waste water is not produced, an ammonia-nitrogen waste water production technology used for many years for tungsten smelting is removed, and the environment protection cost is greatly reduced; and various tungsten terminal products and tungsten powder are directly produced, and the product added value of the tungsten smelting enterprise is improved.

The invention relates to a method for extracting tungsten by acid-decomposing wolframite. The method uses wolframite as a raw material and comprises the following steps: (1) leaching reaction; (2) filtering and washing; (3) hydrogen peroxide extraction-decomposition extraction Tungsten; (4) Multiple dissolution of hydrogen peroxide-decomposition and purification of tungsten acid; (5) Calcination of pure tungstic acid to prepare tungsten trioxide; (6) Spray pyrolysis of peroxytungstic acid solution to prepare tungsten oxide and tungsten powder. In fact, only a small amount of nitric acid or hydrochloric acid is consumed in the decomposition process of the method of the present invention, and cheap and easily available sulfuric acid is mainly consumed, which greatly reduces the cost of tungsten ore decomposition; the present invention uses hydrogen peroxide as the extraction agent of tungstic acid, and does not produce ammonia nitrogen Wastewater eliminates the process of producing ammonia nitrogen wastewater that has been used for many years in tungsten smelting, greatly reducing environmental protection costs; the invention directly produces various tungsten end products (tungsten oxide and tungsten powder), which improves the added value of products for tungsten smelting enterprises.

The invention relates to a method for extracting tungsten and molybdenum from high-molybdenum scheelite, comprising: leaching high-molybdenum scheelite with sulfuric acid solution, extracting molybdenum from the leaching solution; extracting leaching slag with hydrogen peroxide to obtain peroxide-containing Solution of tungstic acid and peroxymolybdic acid, heating or passing through SO 2 , to obtain tungstic acid and a solution containing peroxymolybdic acid; dissolve tungstic acid with hydrogen peroxide, and heat the resulting solution or pass through SO 2 , to obtain tungstic acid and a solution containing peroxymolybdic acid; repeat several times until pure tungstic acid is obtained; prepare tungsten trioxide or tungsten powder from pure tungstic acid; heat the solution containing peroxymolybdic acid or pass through SO 2 , dissolving the obtained molybdenum acid with hydrogen peroxide solution to obtain a peroxymolybdenum acid solution, and ultrasonic spray pyrolysis to prepare molybdenum trioxide powder or molybdenum powder. The method has good separation effect, simple and easy-to-control operation process, and easy industrial popularization and application.

The invention relates to a method for extracting tungsten by decomposing wolframite or black-and-white tungsten mixed ore under pressure with hydrochloric acid-phosphoric acid. During the process of extracting tungsten from China, the reaction system is pressurized so that the temperature is higher than 100°C. The present invention can directly extract tungsten from wolframite or the mixed ore of black and white tungsten without adding additional calcium-containing compounds to transform wolframite during the process of extracting tungsten by applying pressure, which simplifies the production process. Reduced production costs.

The invention relates to a method for circularly removing ammonia and recycling gypsum by using struvite. The method comprises the following steps: S1: dissolving calcium hydroxide and struvite in water, and stirring while heating until water is all evaporated, to obtain solid; S2: dissolving the solid in water, stirring and adding sulfuric acid to obtain a solid-liquid mixture; S3: separating the solid-liquid mixture; taking the supernate and adding into ammonia-nitrogen wastewater for treatment; performing solid-liquid separation, and cleaning to obtain solid which is gypsum; S4: adding ammonia-nitrogen wastewater into the supernate after the solid-liquid separation in S3, and stirring; adding magnesium oxide; standing for solid-liquid separation to obtain solid which is struvite, namely the source of struvite in S1; S5: repeating S1 to S4 for circular removal of ammonia as well as recovery of gypsum. By adopting the method provided by the invention in treatment of ammonia-nitrogen wastewater, the concentration of ammonia and nitrogen in the yielding water is stable, the removal rate of ammonia and nitrogen can reach 90% or more, and the concentration of phosphorous in the yielding water is less than 1mg / L; moreover, a high-purity gypsum product can be recycled.

The invention relates to a method for carrying out acid decomposition on wolframite-scheelite mixed ore to prepare tungsten oxide and tungsten powder. According to the method, the wolframite-scheelitemixed ore is taken as a raw material, and the method comprises the following steps: (1) carrying out a leaching reaction; (2) carrying out filtering and washing; (3) carrying out extraction-decomposition through hydrogen peroxide to extract tungsten; (4) carrying out dissolution-decomposition through hydrogen peroxide for many times to purify tungsten acid; (5) calcining the pure tungsten acid toprepare tungsten trioxide; and (6) carrying out spray pyrolysis on peroxotungstic acid solution to prepare tungsten oxide and tungsten powder. According to the method disclosed by the invention, onlycheap and easily-available sulfuric acid is consumed actually, so that the decomposition cost for the wolframite-scheelite mixed ore is greatly lowered; the acid is used for decomposition, the decomposition slag is gypsum and can be used as a building material, and hazardous waste soda-boiling slag is not generated, so that the production and operation costs of an enterprise are greatly lowered;the hydrogen peroxide is used as an extraction agent for the tungsten acid, ammonia-nitrogen wastewater is not generated, and the process generating ammonia-nitrogen wastewater, which is used for manyyears, in tungsten smelting, is abolished, so that the environmental protection cost is greatly lowered; and the various terminal products of tungsten, and the tungsten powder are directly produced,so that the added value of products in the tungsten smelting enterprise is increased.

The present invention relates to a method for preparing tungsten oxide and tungsten powder from scheelite. The method uses the scheelite as a raw material and comprises the following steps: (1) conducting leaching reaction; (2) conducting filtering and washing; (3) conducting hydrogen peroxide extraction-decomposition to extract tungsten; (4) conducting hydrogen peroxide multiple dissolution-decomposition to purify tungstic acid; (5) pure tungstic acid calcination to prepare tungsten trioxide; and (6) conducting peroxotungstic acid solution spraying pyrolysis to prepare tungsten oxide and tungsten powder. The method only consumes cheap and easily available sulfuric acid, greatly reduces the decomposition cost of the scheelite and uses sulfuric acid to decompose; decomposed residues are gypsum; the gypsum can be used as building materials; the method does not produce dangerous waste alkali cooking residues, greatly reduces production and operation costs of enterprises, uses hydrogen peroxide as an extractant of tungstic acid, does not produce ammonia nitrogen wastewater, eliminates the technology of producing the ammonia nitrogen wastewater for many years in tungsten smelting, greatly reduces environmental protection costs, directly produces various tungsten end products and tungsten powder, and improves added value of products of the tungsten smelting enterprises.

The invention relates to a method for carrying out pressurization and reverse-flow decomposition on wolframite with mixed acid of phosphoric acid and sulfuric acid. According to the method, the main improvements are that a reaction system is pressurized and the temperature is controlled to be higher than 100 DEG C in the process of extracting tungsten from wolframite powder with the mixed acid ofphosphoric acid and sulfuric acid, and a reverse-flow decomposition method is adopted in the operation process. According to the method, by pressurizing, calcium-containing compounds do not need to beadded to conduct conversion on the wolframite in the extracting process of the tungsten, the tungsten can be directly extracted from the high-tin wolframite or a high-tin black and white tungsten mixed ore, so that the production process is simplified, and the production cost is reduced; and through the process of reverse-flow decomposition, the mixed acid can be recycled, and the production costis further reduced.