Method for efficiently extracting tungsten, molybdenum and copper from molybdenum slag

A molybdenum slag and high-efficiency technology, applied in the field of green extraction of non-ferrous metal smelting waste resources, can solve the problems of low added value and difficult separation of tungsten and molybdenum, and achieve the effects of high-efficiency extraction, reduced loss and solving the problem of heavy metal diffusion.

Inactive Publication Date: 2017-11-14
XINYANG HUARUI MOLYBRENUM NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional utilization process of molybdenum slag is washing-alkali dissolution-adjusting pH value-ion exchange. Tungsten and molybdenum are recovered in the form of sodium tungstate and sodium molybdate respectively, and copper is recovered in the form of copper slag. The advantage of this process is that Simple, but it is difficult to separate the recovered tungsten and molybdenum. At the same time, when adjusting the pH value, due to the presence of S in the alkaline leaching solution 2- , a large part of the leached molybdenum is precipitated in the form of molybdenum sulfide, which brings big problems to the subsequent utilization. At the same time, the copper slag is a semi-finished product with low added value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] ① Leaching: Weigh 200g of dried molybdenum slag, and the slag is tested for WO 3 The Mo content is 8%, the Mo content is 25%, and the Cu content is 23%. The molybdenum slag is pretreated to remove S by hot method 2- , the burning pretreatment temperature is controlled at 573K, the pretreatment time is controlled at 3h, and the pretreatment atmosphere is controlled as an oxygen-enriched atmosphere.

[0029] ② Rod mill crushing: The pretreated molybdenum slag is crushed by a rod mill. After crushing, the particle size of the crushed material is controlled to be 92% of the mass of the material that can pass through the 325-mesh screen;

[0030] ③ Alkaline leaching of tungsten and molybdenum: add the molybdenum slag that has been milled into sodium hydroxide for leaching. The concentration of sodium hydroxide in the leaching solution is controlled at 200g / L, the leaching time is controlled at 3h, the leaching temperature is controlled at 343K, and the stirring speed is con...

Embodiment 2

[0034] ① Leaching, weighing 200g of dried molybdenum slag, the slag is tested for WO 3 Mo content is 8%, Mo content is 25%, Cu content is 23%, and molybdenum slag is pretreated to remove S 2- , the pretreatment temperature is controlled at 623K, the pretreatment time is controlled at 4h, and the pretreatment atmosphere is controlled as an oxygen-enriched atmosphere.

[0035] ② Rod mill crushing, the pretreated slag is crushed by rod mill, and the particle size of the crushed material is controlled so that the mass of the material that can pass through the 325-mesh screen accounts for 95%;

[0036] ③ Alkaline leaching of tungsten and molybdenum, the rod-milled material is added to sodium hydroxide for leaching, the concentration of sodium hydroxide in the leaching solution is controlled at 200g / L, the leaching time is controlled at 3h, the leaching temperature is controlled at 363K, and the stirring speed is controlled at 100r / min, the leaching liquid-solid ratio is controlle...

Embodiment 3

[0040] ① Leaching, weighing 200g of dried molybdenum slag, the slag is tested for WO 3 Mo content is 8%, Mo content is 25%, Cu content is 23%, and molybdenum slag is pretreated to remove S 2- , the pretreatment temperature is controlled at 673K, the pretreatment time is controlled at 3h, and the pretreatment atmosphere is controlled as an oxygen-enriched atmosphere.

[0041] ②Rod mill crushing, the pretreated slag is crushed by a rod mill, and the particle size of the crushed material is controlled so that the mass of the material that can pass through the 325 mesh screen accounts for 91%;

[0042] ③Alkaline leaching of tungsten and molybdenum, the rod-milled material is added to sodium hydroxide for leaching, the concentration of sodium hydroxide in the leaching solution is controlled at 150g / L, the leaching time is controlled at 3h, the leaching temperature is controlled at 343K, and the stirring speed is controlled at 80r / min, the leaching liquid-solid ratio is controlled...

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Abstract

The invention discloses a method for efficiently extracting tungsten, molybdenum and copper from molybdenum slag. Through the technology of pretreatment removal of S2-, alkali dissolution for tungsten and molybdenum leaching, tungsten and molybdenum separation through primary amine extraction, copper leaching through inorganic acid, extraction enrichment purification through a ketoxime and aldoxime compound extraction agent, and copper electrowinnig, efficient extracting of tungsten, molybdenum and copper from molybdenum slag is achieved, losing of valuable metal can be reduced, and heavy metal diffusion in slag can be solved.

Description

technical field [0001] The invention relates to the technical field of green extraction of nonferrous metal smelting waste resources, in particular to a method for efficiently extracting tungsten, molybdenum and copper from molybdenum slag. Background technique [0002] China is one of the first countries in the world to smelt tungsten and molybdenum minerals. After years of development, China has developed a series of technologies with remarkable characteristics, especially the combination of ion exchange adsorption tungsten and molybdenum-selective precipitation purification and impurity removal. The process of O-grade APT has become one of the classic methods for preparing high-purity tungsten compounds. In the process of purifying and removing impurities by selective precipitation, molybdenum, sulfur and copper form a composite salt precipitation, which is called molybdenum slag. The molybdenum slag usually contains 20-30% molybdenum, 5-10% tungsten and 20-30% copper, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/34C22B34/36C22B15/00C25C1/12
CPCC22B7/008C22B15/0065C22B34/34C22B34/36C25C1/12Y02P10/20
Inventor 曾斌江亲义袁善禧胡亦发胡俊杰郭红花
Owner XINYANG HUARUI MOLYBRENUM NEW MATERIALS CO LTD
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