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Method for extracting tungsten from scheelite and producing high-quality calcined gypsum

A scheelite, high-quality technology, applied in the direction of improving process efficiency, calcium/strontium/barium sulfate, etc., can solve the problem of tungsten ore affecting the decomposition rate, etc., to overcome the serious problem of HCl volatilization, reduce costs, and leaching equipment simple effect

Active Publication Date: 2011-04-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method realizes the high-efficiency decomposition of scheelite, solves the problem that the tungsten ore is wrapped and affects the decomposition rate during the decomposition process, and can directly obtain high-quality plaster of paris, which improves the economic and environmental benefits of the process

Method used

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  • Method for extracting tungsten from scheelite and producing high-quality calcined gypsum
  • Method for extracting tungsten from scheelite and producing high-quality calcined gypsum

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Further description will be made below in conjunction with examples, and the following examples are intended to illustrate the present invention rather than further limit the present invention.

[0035] Example 1

[0036] Scheelite (including WO 3 70.6%) 1kg, prepared P 2 o 5 Phosphoric acid solution with a content of 15%, then add sulfuric acid, control SO in the process 4 2- The concentration is stable at 0.03g / ml, the liquid-solid ratio is 6:1ml / g, the reaction temperature is 60°C, and the reaction time is 4 hours. After sampling and analysis, the leaching rate of tungsten is 94.3%, and the filter residue contains P 2 o 5 was 5.3%. Then transfer the slurry into a crystallization reaction tank for crystallization transformation. The amount of hemihydrate gypsum seed crystals added is 50g, the temperature is raised to 110°C, the crystallization transformation time is 6h, and the tungsten leaching rate is 99.6%. A Buchner funnel with a specification of 200mm was ...

Embodiment 2

[0038] Scheelite (including WO 3 70.6%) 1kg, prepared P 2 o 5 Phosphoric acid solution with a content of 25%, then add sulfuric acid, control SO in the process 4 2- The concentration is stable at 0.05g / ml, the liquid-solid ratio is 5:1ml / g, the reaction temperature is 55°C, and the reaction time is 2h. After the decomposition reaction, the slurry is transferred to the crystallization reaction tank for crystallization transformation. The amount of hemihydrate gypsum seed crystals is 100g, the temperature is raised to 120°C, the crystallization transformation time is 6h, and the tungsten leaching rate is 99.8%. A Buchner funnel with a specification of 200mm was used to filter the slurry, and the time required for filtration was 15 minutes. Then, the filter cake was washed three times with pure water, and the water consumption was 300ml each time. After washing, the filter cake contained P 2 o 5 down to 0.3%. The filtrate uses a secondary amine-based alkaline extractant to ...

Embodiment 3

[0040] Scheelite (including WO 3 70.6%) 1kg, prepared P 2 o 5 10% phosphoric acid solution, then add sulfuric acid, control SO in the process 4 2- The concentration is stable at 0.02g / ml, the liquid-solid ratio is 8:1ml / g, the reaction temperature is 75°C, and the reaction time is 3h. After the decomposition reaction, the slurry is transferred to the crystallization reaction tank for crystallization transformation. The amount of hemihydrate gypsum seed crystal is 1g, the temperature is raised to 100°C, the crystallization transformation time is 4h, and the tungsten leaching rate is 99.5%. A Buchner funnel with a specification of 200mm was used to filter the slurry, and the time required for filtration was 12 minutes. Then, the filter cake was washed with pure water three times, and the water consumption was 300ml each time. After washing, the filter cake contained P 2 o 5 down to 0.2%. The filtrate uses a tertiary amino-based alkaline extractant to extract tungsten, and ...

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Abstract

The invention provides a method for extracting tungsten from scheelite and producing high-quality calcined gypsum, comprising the following steps: adding a mixed acid of phosphoric acid and sulphuric acid to decompose scheelite; and after decomposition, adding hydrated gypsum seed crystals to finish the dewatering conversion process of dihydrate gypsum to obtain hydrated gypsum with good properties. The invention has the following advantages: the efficient atmospheric pressure leaching of scheelite is realized, the resource and energy consumption is saved, and the decomposition rate of scheelite can reach over 98%; the serious problems of Cl<-> corrosion and HCl volatilization in the traditional acid decomposition process can be overcome; the recycling of phosphoric acid is basically realized, and the leaching cost and the wastewater discharge are greatly reduced; the leaching device is simple, the operation is convenient and industrialization is easy to realize; the obtained byproduct gypsum has pure quality and can be used to produce gypsum boards, and can be used in retarder, plaster and the like produced by using cement; and due to the recrystallization process, the P2O5 content in gypsum is further reduced to below 0.5%.

Description

technical field [0001] The invention relates to the extraction of rare high-melting metal tungsten in the field of hydrometallurgy, in particular to a method for extracting tungsten from scheelite and producing high-quality plaster of paris. Background technique [0002] At present, the main resource consumed by tungsten smelting in my country is black tungsten ore (easy to smelt, and the output accounts for more than 90%), while the basic reserves of black tungsten resources are only about 491,300 tons, which will be exhausted within a few years. In addition, the newly discovered tungsten Most of the resources are complex scheelite resources, and scheelite has shown an absolute advantage (the reserves of scheelite resources are about 1.737 million tons, accounting for 72.1% of the basic reserves of tungsten ore in my country). Therefore, developing scheelite resources to replace black tungsten is a strategic choice for the sustainable development of my country's tungsten ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/06C01F11/46C22B26/20C22B34/36
CPCY02P10/20
Inventor 赵中伟李江涛陈爱良刘旭恒孙培梅李洪桂
Owner CENT SOUTH UNIV
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