Process for preparing high-purity ammonium paratungstate

A technology of ammonium paratungstate and ammonium tungstate, which is applied in the technical field of producing high-purity ammonium paratungstate, can solve the problems of not being able to satisfy tungsten deep-processing products, and achieve the effect of improving technical content and product added value

Inactive Publication Date: 2010-02-10
JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP
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Problems solved by technology

[0010] With the continuous development of the tungsten industry, the ammonium paratungstate product produced by the existing ion exchange method only reaches the national standard zero-level standard, which is increasingly unable to meet the needs of the production of deep-processed tungsten products.

Method used

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  • Process for preparing high-purity ammonium paratungstate
  • Process for preparing high-purity ammonium paratungstate

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Embodiment Construction

[0032] Such as Figure 1-5 Shown, according to the technique for producing parahigh-purity ammonium tungstate of the present invention, be with black tungsten concentrate (Fe, Mn) WO 4 , scheelite (CaWO 4 ), or tungsten ore as raw material, the main steps include:

[0033] 1. Process of preparing crude sodium tungstate solution

[0034] (1) Put the tungsten minerals 10 and 21 into the hopper of the ball mill, send the tungsten minerals into the vibrating ball mill at a quantitative and uniform speed through the screw feeder, and add an appropriate amount of phosphorus salt and water 221 at the same time, and carry out the fine grinding of the ball mill 11 and 22, Make the sieving particle size of the tungsten mineral after the ball milling reach -320 mesh ≥ 95%, add the slurry solution 23 after the ball milling: caustic soda (NaOH) 241, the amount of alkali is not less than 1.8 times of the theoretical amount, preferably 2.1 times; 3 PO 4 ) 241, phosphorus salt (Na 3 PO ...

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Abstract

The invention relates to a process for preparing high-purity ammonium paratungstate, which can obtain a non-ferrous metal product, namely the ammonium paratungstate with low impurity content, whereinthe impurity content of the ammonium paratungstate is low and is lower than 70 ppm, and the ammonium paratungstate can be directly used for preparing deep processed products of tungsten, such as tungsten powder with low impurity content and the like. The process comprises the following four process steps: (1) a process step of preparing a sodium tungstate solution by using a tungsten concentrate (Fe, Mn)WO4, white tungsten (CaWO4) or a tungsten middling product as a raw material; (2) a process step of performing ion exchange on the sodium tungstate solution; (3) a process step of performing impurity removal and filtration by using an ammonium tungstate solution; and (4) a process step of performing crystallization, washing, drying and screening. The process for preparing the high-purity ammonium paratungstate optimizes the technological processes, improves the quality of a product, and reduces the preparation cost of the product.

Description

technical field [0001] The invention relates to a process for preparing ammonium paratungstate, in particular to a process for preparing high-purity ammonium paratungstate. [0002] In this patent specification, the term "high-purity ammonium paratungstate" refers to ammonium paratungstate whose total amount of impurities can be controlled within 70ppm, that is, ammonium paratungstate with low impurity content. [0003] The so-called "ammonium paratungstate" is also called APT. [0004] The term "sieving particle size" refers to the particle size of minerals passing through -320 mesh ≥ 95% after ball milling. [0005] The term "supernatant from pressure filtration" refers to the crude sodium tungstate solution, which is the crude sodium tungstate solution obtained after many times of pressure filtration. [0006] The term "post-delivery solution" refers to the solution discharged after the sodium tungstate solution passes through the ion exchange column adsorption operation....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
Inventor 余欢荣李锦华王光明谢金明肖健全
Owner JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP
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