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Method for transforming wolframite into scheelite

A technology of wolframite and scheelite, applied in the direction of improving process efficiency, etc., can solve the problems of economical and effective separation of precipitation, generation of acid-base waste liquid, pollution of the environment, etc., to increase surface area, improve decomposition rate, improve The effect of economic benefits

Inactive Publication Date: 2012-08-29
CHONGYI ZHANGYUAN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because sodium hydroxide and hydrochloric acid are used in these processes, the chemical properties of sodium ions and chloride ions are active, and it is impossible to separate the precipitates by economical and effective methods.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In a muffle furnace, add WO to 500 g 3 65% by weight of wolframite concentrate with a particle size of -320 mesh was added with 1.2 times the theoretical amount (ie, 168 g) of calcium carbonate, the reaction temperature was 1000 degrees Celsius, and the calcination time was 2 hours to obtain a fired product. The sintered product was crushed by hand - after wet grinding with a ball mill, the particle size was -320 mesh. ) ammonium phosphate was decomposed for 3 hours, and the decomposition rate could reach 98.2%.

Embodiment 2

[0035] In a muffle furnace, add WO to 500 g 3 65% by weight of wolframite concentrate with a particle size of -320 mesh was added with 1.5 times the theoretical amount (ie, 210 g) of calcium carbonate, the reaction temperature was 1000 degrees Celsius, and the calcination time was 2 hours to obtain a fired product. The sintered product was crushed by hand - after wet grinding with a ball mill, the particle size was -320 mesh. ) ammonium phosphate is decomposed for 3 hours, and the decomposition rate can reach 99.5%.

Embodiment 3

[0037] In a muffle furnace, add WO to 500 g 3 65% by weight of wolframite concentrate with a particle size of -320 mesh was added with 1.4 times the theoretical amount (ie, 110 g) of calcium oxide, the reaction temperature was 1000 degrees Celsius, and the calcination time was 2 hours to obtain a fired product. The sintered product was crushed by hand - after wet grinding with a ball mill, the particle size was -320 mesh. ) ammonium phosphate was decomposed for 3 hours, and the decomposition rate could reach 99.1%.

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PUM

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Abstract

The invention relates to a method for transforming wolframite into scheelite. The method comprises the steps as follows: mixing the wolframite with a calcium salt, and calcining to obtain a scheelite-containing calcined product. The method for transforming the wolframite into the scheelite provided by the embodiment of the invention can transform the wolframite into the scheelite with high efficiency, is jointed with the closed smelting and wastewater zero discharge smelting processes for the scheelite so as to realize the closed smelting and wastewater zero discharge of the wolframite; and the production cost can be reduced while the economic benefit is improved.

Description

technical field [0001] The invention belongs to the field of wolframite smelting. More specifically, the present invention relates to a method of converting wolframite to scheelite. Background technique [0002] Traditionally, wolframite is mainly smelted by classical processes, extraction processes and ion exchange processes. Due to the use of sodium hydroxide and hydrochloric acid in these processes, the chemical properties of sodium ions and chloride ions are active, so they cannot be separated and precipitated by an economical and effective method, and it is difficult to open a circuit in the process, which will produce acid-base waste liquid and pollute the environment. SUMMARY OF THE INVENTION [0003] The present invention aims to solve at least one of the above-mentioned technical problems. [0004] In one aspect of the present invention, a method for converting wolframite to scheelite is proposed. The method includes mixing wolframite and calcium salt and calci...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B3/14C22B34/36
CPCY02P10/20
Inventor 赵立夫李红超徐国钻万林生章秋霖
Owner CHONGYI ZHANGYUAN TUNGSTEN
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