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

The invention relates to a method for extracting tungsten and molybdenum through acid decomposition of high-molybdenum scheelite. The method comprises the following steps: leaching the high-molybdenumscheelite with an acid solution, and extracting a leachate to extract molybdenum; extracting a leaching residue with hydrogen peroxide to obtain a solution containing peroxotungstic acid and peroxymolybdic acid, and heating or introducing SO2 to obtain tungstic acid and a solution containing the peroxomolybdic acid; extracting the tungstic acid with hydrogen peroxide, and heating or introducing SO2 to obtain tungstic acid and a solution containing the peroxomolybdic acid; repeating for several times till pure tungstic acid is obtained; preparing tungsten trioxide or tungsten powder from the pure tungstic acid; and heating or introducing SO2 into the solution containing the peroxomolybdic acid, dissolving obtained molybdic acid in a hydrogen peroxide solution to prepare a peroxomolybdic acid solution, and performing ultrasonic spraying pyrolysis to prepare molybdenum trioxide powder or molybdenum powder. By the method, the separation effect is good and the operation process is simple and easy to control, so that the method is easy to popularize and apply industrially.

The invention discloses a method for producing ammonium sulfur and potassium-calcium-silicon fertilizer by using phosphogypsum. The method comprises the followings steps of: adding solution of ammonium carbonate and dried phosphogypsum into a reaction kettle, and performing solid-liquid separation of the obtained pulp by a filter press after reaction; adjusting a pH value of filtrate to 5.6 to 6.0, performing concentration and crystallization of the filtrate and drying the crystals to obtain the fertilizer-graded ammonium sulfate products; washing filter cakes by water, putting the filter cakes in drying equipment, introducing tail gas in a roller kiln furnace to dry the materials, performing heat-exchange drying of the materials in the drying equipment, and using the dried filter cakes a raw material for producing the potassium-calcium-silicon fertilizer; and drying and grinding potassium feldspar and the phosphogypsum, mixing the powder of the potassium feldspar and the phosphogypsum and the dried filter cakes, putting the mixture in a ball mill, putting the mixture in the drying equipment for drying, continuously putting the mixture in the roller kiln furnace for calcining, performing a solid-phase reaction, cooling the reaction products, and dry-grinding and granulating the cooled reaction products to obtain the potassium-calcium-silicon fertilizer, wherein the tail gas in the roller kiln furnace enters the drying equipment to perform the heat-exchange drying of the materials. The method has the advantages of simple process, low raw material cost and low energy consumption.

The invention relates to a method for extracting tungsten-molybdenum from high-molybdenum scheelite. The method comprises the following steps: leaching high-molybdenum scheelite with a sulfuric acid solution, and extracting molybdenum from the leaching liquid; extracting leaching residues with hydrogen peroxide so as to obtain a solution with peroxy-tungstate and peroxy-molybdate, and heating or introducing SO2 so as to obtain a solution with tungstate and peroxy-molybdate; dissolving the tungstate with hydrogen peroxide, heating the obtained solution, and introducing SO2 so as to obtain tungstate and a solution with peroxy-molybdate; repeating the operation for multiple times till pure tungstate is prepared; preparing tungsten trioxide or tungsten powder from the pure tungstate; heating the solution with the peroxy-molybdate, or introducing SO2, dissolving the obtained molybdate with a hydrogen peroxide solution so as to obtain a peroxy-molybdate solution, and performing ultrasonic spray pyrolysis, so as to obtain a molybdenum trioxide powder or a molybdate powder. The method is good in separation effect, simple in operation process, easy in operation process control, and easy inindustrial popularization and application.

The invention relates to a method for decomposing scheelite through pressurizing by adopting phosphorus-sulfur mixed acid. According to the main improved point, in the process of extracting the tungsten from the scheelite by using the mixed acid of phosphoric acid and sulfuric acid, pressurization treatment is carried out on a reaction system, so that the temperature of the reaction system is higher than 100 DEG C. According to the method, pressurized high-temperature treatment is carried out on the reaction system of extracting the tungsten from the scheelite by the phosphoric acid and the sulfuric acid, under the condition that the extraction rate of the tungsten is guaranteed, the addition amount of the phosphoric acid and the sulfuric acid is reduced, and the addition of calcium sulfate crystal seeds is omitted; and compared with an existing non-pressurization method, the method still has the advantages of being high in decomposition rate, free of generation of hazardous waste decomposition slag and low in decomposition cost.

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 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.

The invention relates to a hard alloy waste recovery method. Hard alloy waste contains elemental tungsten and/or tungsten carbide. The method comprises the following steps that 1, the hard alloy waste is mixed with sodium silicate and an additive to obtain a mixture, wherein the additive contains at least one of calcium element or magnesium element; 2, the mixture is roasted at the temperature of 400-1000 DEG C for 1-24 h, a roasted material is obtained, and in the roasting process, the elemental tungsten and/or the tungsten carbide in the hard alloy waste, the sodium silicate and the additive react under the high-temperature condition to generate sodium tungstate and calcium silicate and/or magnesium silicate; and 3, the roasted material is subjected to water leaching, a solid-liquid mixture is obtained, filter residues are removed after solid-liquid separation, and a sodium tungstate solution is obtained. The method is simple to operate, low in input cost, low in reagent consumption, low in decomposition cost, free of the problem of a roasting furnace bonding at the same time, high in tungsten recovery rate, suitable for industrial production and great in popularization significance.

The invention discloses a recovery device for waste mobile terminals. The device comprises an outer shell, wherein a circulation cavity is arranged in the outer shell; racks are arranged in the frontend wall and the rear end wall of the right side of the circulation cavity in a sliding manner; gears are connected with the racks on the right side of the racks and are fixedly arranged on a shaft; and a motor is fixedly arranged in the front end wall of the circulation cavity. The device is small in dependence on manual operation, and high in efficiency; when a large number of waste mobile terminals are accumulated, the waste mobile terminals can be conveyed into a separating chamber through a conveying channel in order to be decomposed through the pressure of gravity, so that the decomposing cost is greatly saved; and moreover, a circulation assembly is arranged, and an air purifying device for filtering toxic gas is arranged at an exhausting part.