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Treatment method for ammonium paratungstate oversize material

A technology of ammonium paratungstate and sieve, which is applied in the fields of tungsten compounds, chemical instruments and methods, inorganic chemistry, etc., and can solve the problems of increased production costs and environmental protection costs, failure to meet particle size specifications and water content, crystal lattice, and morphology damage and other problems, to achieve the effect of maintaining good crystal lattice morphology, reducing material particle size, and good looseness

Inactive Publication Date: 2018-09-14
CHINA MOLYBDENUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to particle size specifications and water content that do not meet the national standard requirements, the content of chemical impurities fully meets the process requirements, resulting in a reduction in primary yield
[0003] The known treatment methods are: 1. Mechanical crushing method, which can lead to the destruction of crystal lattice and morphology, which will bring genetic influence and increase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 100ml of pure water, add 20g of the sieve under stirring, the solid-liquid ratio is 1:5, heat to boil, keep warm for 60min, and get 75ml of filtrate, the evaporation volume is 25ml, and the solution contains tungsten 48g / l. Cool to room temperature, the solution contains tungsten 40g / l, molybdenum is less than 0.001g / l, the yield of filter cake is 87.5%, the crystal dissociation is sufficient, the looseness is good after filtration, impurity Na is reduced from 5ppm to 2ppm, and S is reduced from 7ppm to 5ppm .

Embodiment 2

[0036] Add 160ml of pure water, add 80g of the sieve under stirring, the solid-to-liquid ratio is 1:2, heat to boiling, keep warm and heat for 60-90min, get 70g of dry filter cake, the yield is 85%, the crystal dissociation is sufficient, and the looseness after filtration Well, impurity Na is reduced from 3ppm to 2ppm, and S is reduced from 7ppm to 6ppm.

[0037] The invention has the following advantages:

[0038] First, the present invention is based on the principle that the solubility of ammonium paratungstate in water is small, the operation method used is simple and easy, the process has no reagent consumption, and the production cost can be greatly reduced by short-flow operation, and the loss rate of the process can be reduced by 1-2%. The looseness is good, and the process yield is high, which can be explained by the following comparative examples;

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PUM

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Abstract

The invention relates to a treatment method for an ammonium paratungstate oversize material. The operation method is simple and practicable, can greatly lower the production cost by short process operation, at the same time reduces the process loss rate by 1-2%, the oversize material has good looseness, the process yield is high, the pure physical hydrolysis method realizes zero discharge of wastegas and wastewater, and is in line with the clean production requirements. The method realizes fast yield increase by 3-5%, at the same time the obtained tungsten-containing feed liquid can be directly used for preparation of a stripping agent for the extraction process and ammonia-dissolving configured ammonia water, therefore the method avoids later treatment of tungsten-containing feed liquid,is more energy-saving and more environmentally friendly, and meets the requirements of short process high efficiency production. At the same time, the method can further lower the content of hydrolyzable impurities in crystals, the crystal lattice morphology is well kept, and the material particle size is further reduced, therefore the method provided by the invention is a scientific method for treatment of ammonium paratungstate and similar oversize materials.

Description

Technical field: [0001] The invention belongs to the field of hydrometallurgy of nonferrous metals, and in particular relates to a method for treating ammonium paratungstate oversize by using a physical hydrothermal method. Background technique: [0002] In the crystal drying and screening process of the ammonium paratungstate production process in the prior art, due to the discomfort of the solid-liquid separation of the ammonium paratungstate crystal free water control or the influence of the temperature gradient generated during the drying process, 3~8 % of oversize. The ammonium paratungstate sieve refers to a crystal bond formed due to physical agglomeration in the drying and sieving process, a kind of ammonium paratungstate agglomerate or high free A mixture of water and wet ammonium paratungstate crystals. Except that the particle size specification and water content do not meet the requirements of the national standard, the content of chemical impurities fully meet...

Claims

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Application Information

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IPC IPC(8): C01G41/00
CPCC01G41/00C01P2006/80
Inventor 朱要武琚成新琚向东杜开亮郑灿辉谭晓飞
Owner CHINA MOLYBDENUM