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Method for decomposing scheelite

A technology of scheelite and mass percentage, which is applied in the field of hydrometallurgy, can solve the problems of difficult to achieve satisfactory decomposition effect, can not solve the problems of tungstic acid wrapping, HCl volatilization, etc., to overcome the serious problem of Cl-corrosion, and save the cost of phosphorus removal reagents , the effect of simplifying the operation

Active Publication Date: 2011-06-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the actual addition of sodium chloride is still difficult to achieve a satisfactory decomposition effect, and the introduction of Cl - It will also bring problems of equipment corrosion and HCl volatilization, and cannot solve the problem of tungstic acid wrapping, so the present invention intends to develop a process scheme for decomposing scheelite by acid method without adding sodium chloride

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Scheelite (including WO 3 70.6%) 1kg, prepared with P 2 O 5 Phosphoric acid solution with a content of 20%, then add sulfuric acid to control SO 4 2- The concentration is 0.15g / ml, the liquid-solid ratio is 6:1ml / g, the reaction temperature is 80°C, and the reaction time is 6h. The tungsten leaching rate was 98.7%. The filter slurry adopts a Buchner funnel with a specification of 200mm, and the time required for filtration is 2h. Then the filter cake is washed three times with pure water, and the water consumption is 300ml each time. After washing, the filter cake contains P 2 O 5 Reduce to 4.5%. The filtrate is adsorbed by quaternary amine anion exchange resin, and the adsorption rate of tungsten is 99.1%. In the process of ion exchange, the total loss of phosphorus in the form of phosphotungstic heteropoly acid and entrainment loss is 3.7%, and the mother liquor makes up the lost phosphoric acid and sulfuric acid and returns to the leaching ore.

Embodiment 2

[0031] Scheelite (including WO 3 70.6%) 1kg, prepared with P 2 O 5 35% phosphoric acid solution, then add sulfuric acid to control SO 4 2- The concentration is 0.10g / ml, the liquid-solid ratio is 8:1ml / g, the reaction temperature is 100°C, and the reaction time is 1h. The tungsten leaching rate was 98.3%. The filter slurry adopts a Buchner funnel with a specification of 200mm, and the time required for filtration is 4h. Then the filter cake is washed three times with pure water, and the water consumption is 300ml each time. After washing, the filter cake contains P 2 O 5 Reduced to 6.2%. The filtrate was adsorbed by primary amine-based anion exchange resin, and the adsorption rate of tungsten was 99.3%. In the process of ion exchange, the total loss of phosphorus in the form of phosphotungstic heteropoly acid and entrainment loss is 2.9%. The mother liquor makes up the lost phosphoric acid and sulfuric acid and returns to the leaching ore.

Embodiment 3

[0033] Scheelite (including WO 3 70.6%) 1kg, prepared with P 2 O 5 Phosphoric acid solution with a content of 5%, then add sulfuric acid to control SO 4 2- The concentration is 0.40g / ml, the liquid-solid ratio is 5:1ml / g, the reaction temperature is 70°C, and the reaction time is 5h. The tungsten leaching rate was 99.2%. The filter slurry uses a Buchner funnel with a specification of 200mm, and the time required for filtration is 1h. Then the filter cake is washed three times with pure water, and the water consumption is 300ml each time. After washing, the filter cake contains P 2 O 5 Decrease to 2.2%. The filtrate is adsorbed by a secondary amine-based anion exchange resin, and the adsorption rate of tungsten is 98.7%. In the ion exchange process, the total loss of phosphorus in the form of phosphotungstic heteropoly acid and entrainment loss is 2.6%, and the mother liquor is added to the lost phosphoric acid and sulfuric acid and then returned to the leaching ore.

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Abstract

The invention discloses a method for decomposing scheelite. The method has the following specific operations of: preparing the solution of phosphoric acid and adding sulfuric acid; after heating to a temperature required for decomposing, adding the scheelite into a reaction tank for reacting; after finishing reacting, extracting tungsten from a filtrate obtained by filtering; and adding the phosphoric acid and the sulfuric acid to an initial level, and returning for performing mineral leaching. The method has the advantages that: the phosphorus content of the scheelite is not required strictly; floated rough concentrate of the scheelite does not need to be directly conveyed for smelting for removing phosphorus specifically any longer, so the cost of a phosphorus removing agent and the loss of the tungsten are saved; one-step high-efficiency normal-pressure leaching of the scheelite is realized; resource and energy consumption are saved; the decomposition rate of the scheelite can reach over 98 percent; the problem that Cl<-> and HCl in a conventional decomposing process is volatized seriously is solved; the cyclic utilization of the phosphoric acid is basically realized; leaching cost and wastewater discharge amount are reduced extremely; leaching equipment is simple and is convenient to operate; and industrialization is easy to realize.

Description

Technical field [0001] The invention relates to the extraction of the rare high melting point metal tungsten in the field of hydrometallurgy, in particular to a method for decomposing scheelite. Background technique [0002] The tungsten industry is my country’s dominant industry. my country’s tungsten resource reserves are the largest in the world, and its output and exports are also the largest. [0003] At present, the main resource consumed by tungsten smelting in my country is wolframite (easy to be smelted, and the output accounts for more than 90%). The basic reserves of wolframite resources are only about 491,300 tons, which will be exhausted within a few years, plus newly discovered tungsten. The resources are mostly complex scheelite resources, and scheelite has an absolute advantage (the reserves of scheelite resources are about 1,737,700 tons, accounting for 72.1% of the basic reserves of tungsten ore in my country). Therefore, the development of scheelite resources to ...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B34/36
CPCY02P10/20
Inventor 赵中伟李江涛
Owner CENT SOUTH UNIV
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