Method for decomposing scheelite

A scheelite and mineral technology, applied in the field of decomposing scheelite, can solve the problems of deterioration of calcium sulfate crystallization environment, affecting tungsten extraction and rising, etc., and achieve the effects of reducing leaching cost and waste water discharge, convenient operation and simple equipment

Active Publication Date: 2013-09-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] This type of method has achieved satisfactory results in the treatment of minerals such as scheelite concentrate, high-phosphorus scheelite, and high-molybdenum scheelite. However, the control requirements for the decomposition process conditions are strict, and a little carelessness may lead to sulfuric acid The calcium crystallization environment deteriorates, thus forming a dense package on the undecomposed scheelite, res

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Cyclic complexation decomposition containing WO 3 72.6% scheelite concentrate. First prepare 3L of mixed solution of nitric acid and phosphoric acid, wherein the mass fraction of nitric acid is 25%, and the amount of phosphoric acid is equal to the contained P and the WO contained in the mineral to be decomposed. 3 The molar ratio of scheelite is 1:6. After heating the solution to 20°C, add 1 kg of scheelite concentrate, and then filter for 1 hour. Under the experimental conditions, the decomposition rate of scheelite is 99.89%. The filtrate is adsorbed by primary amine-based anion exchange resin, and the adsorption rate of tungsten is 99.31%. After adsorption, the nitric acid is regenerated by adding concentrated sulfuric acid, and the amount of sulfuric acid added is SO 4 2- Ca in solution 2+ The molar ratio was 0.9:1, and the calcium sulfate precipitate was filtered after 2 hours of reaction. The filtered solution is added with phosphoric acid and nitric acid to...

Embodiment 2

[0025] Cyclic complexation decomposition containing WO 3 72.6% scheelite concentrate. First prepare 10L of mixed solution of nitric acid and phosphoric acid, wherein the mass fraction of nitric acid is 5%, and the amount of phosphoric acid is equal to the contained P and the WO contained in the mineral to be decomposed. 3 The molar ratio of the solution is 2:1, the temperature of the solution is raised to 80°C, and 1 kg of scheelite concentrate is added, and then filtered after reacting for 6 hours. Under the experimental conditions, the decomposition rate of scheelite is 99.92%. The filtrate is adsorbed by secondary amine-based anion exchange resin, and the adsorption rate of tungsten is 99.15%. After adsorption, the nitric acid is regenerated by adding concentrated sulfuric acid, and the amount of sulfuric acid added is SO 4 2- with Ca in solution 2+ The molar ratio of the solution was 1:1, and the precipitated calcium sulfate was filtered after 1 h of reaction. The fil...

Embodiment 3

[0027] Cyclic complexation decomposition containing WO 3 72.6% scheelite concentrate. First prepare 5L of mixed solution of nitric acid and phosphoric acid, wherein the mass fraction of nitric acid is 10%, and the amount of phosphoric acid is equal to the contained P and the WO contained in the mineral to be decomposed. 3The molar ratio of scheelite is 1:2. After heating the solution to 40°C, add 1 kg of scheelite concentrate, and then filter for 4 hours. Under the experimental conditions, the decomposition rate of scheelite is 99.94%. The filtrate is adsorbed by tertiary amine-based anion exchange resin, and the adsorption rate of tungsten is 99.02%. After adsorption, the nitric acid is regenerated by adding concentrated sulfuric acid, and the amount of sulfuric acid added is SO 4 2- Ca in solution 2+ The molar ratio was 0.9:1, and the calcium sulfate precipitate was filtered after 2 hours of reaction. The filtered solution is added with phosphoric acid and nitric acid t...

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Abstract

The invention provides a method for decomposing scheelite. The scheelite is decomposed by employing nitric acid, so that Ca in the scheelite can enter the solution in a form of soluble calcium nitrate; meanwhile, phosphoric acid or phosphorite (the phosphorite is decomposed into phosphoric acid through the nitric acid) serve as a tungsten complexing agent, so that WO3 in the scheelite enters the solution in a form of soluble phosphotungstic acid, the generation of solid tungstic acid membrane and slightly soluble calcium salt is avoided in the whole decomposition process, the calcium nitrate solution containing phosphotungstic acid, which is generated after decomposition, is extracted by employing a solvent and is subjected to ion exchange or ammonium salt precipitation method so that the phosphotungstic acid is recovered from the calcium nitrate solution; and sulfuric acid is added into the calcium nitrate solution from which tungsten is extracted and is combined with calcium ion in the solution so as to generate slightly soluble calcium sulfate precipitate, so that the nitric acid is regenerated; and the regenerated nitric acid return to a new round of mineral leaching process. The method has the advantages that tungsten in the tungsten mineral can be completely decomposed; the regenerated nitric acid is recycled, and the leaching cost and wastewater discharge are greatly reduced; and moreover, the treatment equipment is simple, the operation is convenient, and industrialization is easily realized.

Description

technical field [0001] The invention relates to the extraction process of tungsten in the field of hydrometallurgy, in particular to a method for decomposing scheelite. Background technique [0002] Tungsten and its alloys are widely used in various fields such as national defense and military industry, machining, and electronics industry due to their excellent physical and chemical properties, and have become important strategic materials. The tungsten industry is a dominant industry in my country, and its resource reserves, output and export volume all rank first in the world. More than 2 / 3 of the basic reserves of tungsten ore in my country are scheelite resources, forming an absolute advantage. [0003] At present, the mainstream process for processing scheelite is based on the alkaline process that generates insoluble calcium salts. For example, Na 2 CO 3 Pressure cooking process is used to decompose scheelite, while in China, the treatment technology of wolframite N...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/28C22B3/42C22B3/44C22B34/36
CPCY02P10/20
Inventor 李江涛赵中伟陈星宇刘旭恒
Owner CENT SOUTH UNIV
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