Method for preparing ammonium tetramolybdate product through reverse extraction and impurity removal

Abstract

The invention relates to a method for preparing an ammonium tetramolybdate product through reverse extraction and impurity removal, and belongs to the technical field of chemical impurity removal. The method specifically comprises the steps that tungsten in molybdenum is removed by adjusting the concentration of a reverse extraction reagent, and silicon and other impurities in reverse extraction liquid are removed through a precipitation method. The preparation and purification integration of the molybdenum product can be realized. According to the method, a molybdenum-loaded organic phase is subjected to reverse extraction, an alkaline solution with the pH value of 6-10 is adopted for reverse extraction, and the alkaline solution comprises ammonia water, sodium hydroxide, sodium bicarbonate or ammonium chloride and sodium hydroxide buffer solution and other alkaline solutions. The phase ratio of the reverse extraction is 10 / 1-1 / 10, the number of the reverse extraction stages is 1-10, and the reverse extraction stages are adjusted according to different compositions of the loaded organic phase. The application range on molybdenum raw materials is wide, and industrialization is easy to achieve. According to changes of raw materials and fluctuation of element content, preparation of molybdenum products can be achieved by adjusting process parameters, and the method is a universal integrated process and has practical application value.

Description

technical field [0001] The invention belongs to the technical field of chemical impurity removal, and relates to a method for back-extracting molybdenum from a molybdenum-loaded organic phase and deeply removing impurities such as silicon in the back-extraction solution. Background technique [0002] Molybdenum is an important strategic rare metal. Because of its good thermal conductivity, electrical conductivity, high temperature resistance, wear resistance and corrosion resistance, it is widely used in the fields of steel, chemical industry, electronics, aerospace, biomedicine, agriculture and national defense construction. . With the increase of molybdenum consumption, the development and utilization grade of molybdenum concentrate is getting lower and lower. At the same time, more and more attention has been paid to the utilization of secondary resources containing molybdenum. In the process of recycling secondary resources, the impurity content is complex Diverse, espe...

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Problems solved by technology

U.S. Patent U.S.Pat.No.3,969,478 proposes a method for separating tungsten and molybdenum: adding H to the acidic tungsten and molybdenum mixed solution 2 o 2 Make tungsten and molybdenum form peroxo complexes of tungsten and molybdenum respectively, and then use phosphoric acid ester (such as tributyl phosphate TBP) or trialkylphosphine oxide (such as tributylphosphine oxide TBPO, trioctylphosphine oxide TOPO ) or tertiary amines (such as trioctylamine TOA) or quaternary ammonium salts (such as tetraoctyl ammonium sulfate) and other extractants under certain conditions preferentially extract molybdenum peroxygen complexes and separate them from tungsten. The extraction process of this method is especially Difficulties in phase separation during stripping

U.S. Patent U.S.Pat.No.4,275,039, in order to improve the phase separation problem in the extraction process, use the three-component mixed extractant to replace the single-component extractant, that is, by D 2 EHPA, TBP, and TBPO are mixed in a certain proportion to form a three-component mixed extractant, which effectively solves the problem of phase separation, but the composition of the organic phase is too complicated, which is not conducive to industrialization.

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