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 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 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.