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Method for recovering metal by use of APT (ammonium paratungstate) waste slag

A waste slag and metal technology, applied in the field of resource recovery and reuse, can solve the problems of resin poisoning, increase labor intensity, waste copper and tungsten, etc., and achieve the effects of improving economic efficiency, reducing resource waste and improving utilization rate.

Inactive Publication Date: 2013-05-15
陈泉兴
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the waste slag containing copper, tungsten and molybdenum in the APT production process is mainly sold to molybdenum manufacturers in the form of by-products for single molybdenum recovery, which wastes copper and tungsten to a large extent, or returns the waste slag to the ball milling process. Co-processing with tungsten concentrate
The disadvantages of this treatment method are: ① a large amount of impurity elements in the waste residue will cause great damage to the resin in the subsequent ion exchange process, which will easily cause resin poisoning and bring greater economic losses; ② increase the labor intensity; ③ not Facilitates efficient recovery of molybdenum and copper
[0004] After searching, there are literatures reporting a method of extracting and separating tungsten and molybdenum from the tungsten-molybdenum slag produced in the production process of ammonium paratungstate and obtaining qualified APT products and molybdenum-containing slag, specifically, the method of sulfiding the ammonium paratungstate production process containing Tungsten and molybdenum slag are immersed in ammonia solution, and water vapor is passed into the crystallization pot to maintain the pressure of 0.1-0.2MPa. After the reaction, it is filtered and cooled through the plate frame, and directly enters the vulcanization tank for molybdenum removal to obtain qualified APT products and molybdenum slag; this method The disadvantage is that the copper and molybdenum metals contained in the waste residue cannot be recovered, which reduces the utilization rate of resources, and also requires another pressure equipment crystallization pot, which increases equipment investment

Method used

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  • Method for recovering metal by use of APT (ammonium paratungstate) waste slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of method utilizing APT waste slag to recover metal, its steps are as follows:

[0029] a. Waste residue grinding: take 100kg of waste residue, of which WO 3 The content is 6%, the Mo content is 15%, and the Cu content is 24%. The waste residue containing copper, tungsten and molybdenum produced in the production process of ammonium paratungstate is ground to -325 mesh ≥ 90%;

[0030] b. Recovering copper by alkali leaching: filter the waste slag in step a with a water softening material with a pH value of 7.5 to separate the slag containing copper from the filtrate containing tungsten and molybdenum, and leave the filtrate containing tungsten and molybdenum until the next step. The slag material that contains copper carries out alkali boiling leaching, and wherein alkali is NaOH, and when the concentration of alkali is in 35g / L scope, stop adding alkali, boil and keep warm for 1.5h, obtain copper sulfide 23.11kg after washing, in this step Cu The recovery rate ...

Embodiment 2

[0036] A kind of method utilizing APT waste slag to recover metal, its steps are as follows:

[0037] a. Waste residue grinding: take 100kg of waste residue, of which WO 3 The content is 6%, the Mo content is 15%, and the Cu content is 24%. The waste residue containing copper, tungsten and molybdenum produced in the production process of ammonium paratungstate is ground to -325 mesh ≥ 90%;

[0038]b. Copper recovery by alkali leaching: filter the waste slag in step a with a softening material with a pH value of 8.5, filter the slag containing copper and the filtrate containing tungsten and molybdenum, and leave the filtrate containing tungsten and molybdenum until the next step. The slag material that contains copper carries out alkali boiling leaching, and wherein alkali is NaOH, when the concentration of alkali is in 45g / L scope, stop adding alkali, boil and keep warm for 2.5h, obtain copper sulfide 23.472kg after washing, in this step Cu The recovery rate is 97.8%;

[003...

Embodiment 3

[0044] A kind of method utilizing APT waste slag to recover metal, its steps are as follows:

[0045] a. Waste residue grinding: take 100kg of waste residue, of which WO 3 The content is 6%, the Mo content is 15%, and the Cu content is 24%. The waste residue containing copper, tungsten and molybdenum produced in the production process of ammonium paratungstate is ground to -325 mesh ≥ 90%;

[0046] b. Copper recovery by alkali leaching: filter the waste slag in step a with a demineralized material with a pH value of 8.0 to separate the slag containing copper from the filtrate containing tungsten and molybdenum, and leave the filtrate containing tungsten and molybdenum until the next step. The slag material that contains copper carries out alkali boiling leaching, and wherein alkali is NaOH, when the concentration of alkali is in 40g / L scope, stop adding alkali, boil and keep warm 2.0h, obtain copper sulfide 23.352kg after washing, in this step Cu The recovery rate is 97.3%; ...

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Abstract

The invention belongs to the field of resource recycling, and particularly relates to a method for recovering metal by the use of APT (ammonium paratungstate) waste slag. The invention discloses a method for recovering metal by the use of APT waste slag, and comprises the following steps of: (a) waste slag grinding: grinding the waste slag containing copper, tungsten and molybdenum generated in an ammonium paratungstate production process until the particles of -325 meshes account for at least 90%; (b) alkaline leaching and copper recovery; (c) oxidation and impurity removal; (d) acid decomposition and tungsten recovery; (e) ammonia leaching and molybdenum recovery; and (f) preparation of APT and ammonium paramolybdate: preparing APT and ammonium paramolybdate from the tungstic acid and ammonium molybdate obtained in step d and step e respectively by subsequent traditional process. The method provided by the invention can recover copper, tungsten and molybdenum in the APT waste slag so as to effectively reduce resource waste and improve the utilization rate of resources; the recovery rate of copper, tungsten and molybdenum is as high as about 95%; by recovering the elements copper, tungsten and molybdenum in waste slag, the economic benefits of an enterprise can be increased; and a major part of the solution generated by the method is treated in subsequent processes, causing little environmental pollution.

Description

technical field [0001] The invention belongs to the field of resource recovery and reuse, and in particular relates to a method for recovering metals by using APT (ammonium paratungstate) waste residue. Background technique [0002] Metal copper, tungsten and molybdenum are important non-ferrous metals, among which tungsten and molybdenum are not only used to make alloy steel, but also widely used in other fields such as chemical industry. Copper is used more widely, and copper is an indispensable conductive material in the electronics industry. At present, many tungsten concentrates in China contain a certain proportion of molybdenum. The resource utilization of the copper-containing tungsten-molybdenum slag produced in the APT production process can not only create profits for enterprises, but also create wealth for the country. [0003] At present, the waste slag containing copper, tungsten and molybdenum in the APT production process is mainly sold to molybdenum manufac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B15/00C22B34/34C22B34/36
CPCY02P10/20
Inventor 陈泉兴张中山
Owner 陈泉兴
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