A method of processing scheelite

A technology of scheelite and magnesium salts, applied in the field of efficient leaching of tungsten in scheelite, can solve problems such as difficulty in extracting tungsten, reduce costs, avoid potential safety hazards, and improve leaching efficiency of tungsten ore

Active Publication Date: 2019-10-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems existing in the existing methods for processing scheelite, the first object of the present invention is to provide a CaWO which is difficult to be leached by acid and alkali in scheelite by using magnesium salt at high temperature. 4 Transformation to MgWO that is easy to conventional acid-base leaching 4 , a method for improving the leaching efficiency of scheelite, which solves the problem of difficulty in extracting tungsten directly from calcium tungstate

Method used

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  • A method of processing scheelite
  • A method of processing scheelite
  • A method of processing scheelite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A certain scheelite contains WO 3 : 61.72%, the particle size is less than 200μm. Weigh 5g of the ore, add 4 times the theoretical amount of magnesium chloride, mix evenly, put it into a muffle furnace and roast at 670°C for 4 hours to obtain calcined sand; add 300mL deionized water to the calcined sand, stir at room temperature for 2 hours, filter, and wash to obtain Filter cake: Add 30 mL of hydrochloric acid with a concentration of 6 mol / L to the filter cake, react at 60°C for 3 hours, and then filter to obtain tungstic acid, the extraction rate of metal W is 99.4%.

[0035] Control experiment: A certain scheelite contains WO 3: 61.72%, the particle size is less than 200μm. Weigh 5 g of the ore, add 30 mL of hydrochloric acid with a concentration of 6 mol / L, react at 60° C. for 3 hours, and then filter to obtain tungstic acid. The extraction rate of metal W is 72.3%.

Embodiment 2

[0037] A certain scheelite contains WO 3 : 43.89%, the particle size is less than 200μm. Weigh 5g of the ore, add 3 times the theoretical amount of magnesium nitrate, mix evenly, put it into a muffle furnace and roast at 650 degrees for 6 hours to obtain calcined sand; add 200mL deionized water to the calcined sand, stir at room temperature for 3 hours, filter, wash, Obtain a filter cake; add 40 mL of nitric acid with a concentration of 3 mol / L to the filter cake, react at 80° C. for 4 hours, and then filter to obtain tungstic acid. The extraction rate of metal W is 98.6%.

Embodiment 3

[0039] A certain scheelite contains WO 3 : 26.45%, the particle size is less than 200μm. Weigh 5g of the ore, add 6 times the theoretical amount of magnesium nitrate, mix evenly, put it into a muffle furnace and roast at 670°C for 8 hours to obtain calcined sand; add 400mL deionized water to the calcined sand, stir at room temperature for 3 hours, filter, wash, Obtain a filter cake; add 40 mL of hydrochloric acid with a concentration of 8 mol / L to the filter cake, react at 30° C. for 5 hours, and then filter to obtain tungstic acid. The extraction rate of metal W is 98.2%.

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Abstract

The invention discloses a method of treating scheelite, comprising: mixing scheelite and a magnesium salt, and roasting at high temperature; washing the roasted product via water; performing acid leaching or alkali leaching to obtain tungstic acid or tungstate solution. The magnesium salt is utilized in the method to convert CaWO4, difficult to extract by acid or alkali leaching, in scheelite intoMgWO4 easy to extract by acid or alkali leaching; tungsten ore leaching rate is increased. The method helps solve the problem tungsten is difficult to extract directly from calcium tungstate.

Description

technical field [0001] The invention relates to a treatment method of scheelite, in particular to a method for converting calcium tungstate in scheelite into magnesium tungstate which is easy to leach by using magnesium salt under high temperature conditions to realize efficient leaching of tungsten in scheelite , belonging to the field of metallurgy technology. Background technique [0002] In nature, there are more than 20 types of tungsten minerals that have been discovered, such as wolframite ((Fe,Mn)WO 4 ), scheelite (CaWO 4 ), Tungsten China (WO 3 ·H 2 O), sulfur tungsten ore (WS 2 ), Wolframite (PbWO 4 )etc. Wolframite and scheelite are the main raw materials for industrial tungsten smelting. Because wolframite is easy to mine, select and smelt, for a long time, smelting wolframite has been used as the main raw material in industry, while scheelite is rarely used as raw material. With the continuous depletion of wolframite, refractory scheelite has become the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B34/36
Inventor 周康根龚丹丹彭长宏陈伟李俊杰
Owner CENT SOUTH UNIV
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