The method of accurate titration of industrial ammonium tungstate solution to solve the product ammonium paratungstate macular

Abstract

The invention discloses a method for accurately titrating industrial ammonium tungstate solution to solve yellow spots of a product ammonium paratungstate, which comprises the following steps of: S1,extracting an industrial ammonium tungstate solution, taking hydrogen peroxide for the industrial ammonium tungstate solution according to a certain proportion to carry out titration, recording the consumption volume of the hydrogen peroxide, and according to a taking proportion, calculating the volume of hydrogen peroxide required by the residual industrial ammonium tungstate solution; S2, addingthe required volume of hydrogen peroxide into the residual industrial ammonium tungstate solution in the step S1, stirring, carrying out centralization and crystallization, filtering, washing crystals with pure water, and drying to obtain the product ammonium paratungstate. The method has the beneficial effects of simplicity in operation and accurate desulphuration for solving the yellow spots ofthe product ammonium paratungstate.

Description

technical field [0001] The invention relates to the field of ammonium paratungstate production. More specifically, the present invention relates to a method for accurately titrating industrial ammonium tungstate solution to solve product ammonium paratungstate macula. Background technique [0002] At present, ammonium paratungstate (APT) is generally produced by alkali decomposition → ion exchange → molybdenum removal by sulfide → concentration and crystallization process in China. Excessive (NH 4 ) 2 S and CuSO 4 Precipitation removes molybdenum, so that the sulfur content in the ammonium tungstate solution after molybdenum removal exceeds the standard, resulting in excessive sulfur in the product ammonium paratungstate, and the color is yellowish. According to relevant reports, there are two methods to remove sulfur in ammonium tungstate solution: recrystallization method and activated carbon adsorption method. The recrystallization method has low yield, complicated pr...

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Problems solved by technology

The recrystallization method has low yield, complex process, and high energy consumption. The activated carbon adsorption method mainly has the disadvantages of reduced sulfur adsorption efficiency after activated carbon regeneration. Moreover, with the development of the industry, traditional APT-0 grade products have been difficult to meet the requirements of high-end tungsten. In order to obtain the ammonium paratungstate product that meets the requirements, a simple and accurate sulfur removal method is required.