Method for regenerating APT (ammonium paratungstate) by use of APT waste low-grade tungsten slag

A technology of tungsten slag and concentration, which is applied in the field of recycling and reuse of tungsten resources, can solve the problems of high requirements for the impurity removal process, affecting the stability of process parameters, and relatively large process impact, so as to extend the service life, reduce emissions, and improve The effect of recovery

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

AI Technical Summary

Problems solved by technology

[0006] At present, the waste low-grade tungsten slag produced in the domestic APT production process is mainly sold to other resource recycling companies in the form of by-products for the recovery of other trace metal elements such as copper, tin, zinc, etc., which is largely wasted Tungsten resources, or return the waste slag to the ball milling process, and process it with tungsten concentrate. The disadvantage of this process is that there are a large number of impurity elements in the waste slag, which has a great impact on the subsequent process, and the operational requirements for the impurity removal process Very high, affecting the stability of process parameters, and will cause greater pollution to the environment

Method used

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  • Method for regenerating APT (ammonium paratungstate) by use of APT waste low-grade tungsten slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Abrasives and ingredients: Grind APT waste low-grade tungsten slag to -125 mesh ≥ 90%, take WO 3 The grade is allocated to 100kg of 4% waste low-grade tungsten slag material, and then the batching is carried out. The addition of soda in the batching is 5.4kg, and the addition of saltpeter in the batching is 0.08kg;

[0023] b. Slag calcining: Calcining the slag prepared in step a in a rotary kiln, the temperature of the firing zone is 1000-1100°C, the rotating speed of the rotary kiln is 0.3r / min, and the temperature of the kiln tail smoke chamber is 800—850°C, pressure -110——150Pa; outlet temperature of preheater is 230—245°C, inlet pressure is -120——160Pa, outlet pressure is -7000——7100Pa; kiln head cover temperature is 700 -750°C; the calcination time is 1.6h, and the sintered material is generated after the calcination is completed;

[0024] c. Wet grinding and filtering: Add demineralized water to the sintered material for wet grinding, the liquid-solid ratio i...

Embodiment 2

[0029] a. Abrasives and ingredients: Grind APT waste low-grade tungsten slag to -125 mesh ≥ 90%, take WO 3 The grade is allocated to 100kg of waste low-grade tungsten slag material of 8%, and then the batching is carried out. The addition of soda in the batching is 11.6kg, and the addition of saltpeter in the batching is 0.224kg;

[0030] b. Slag calcining: Calcining the slag prepared in step a in a rotary kiln, the temperature of the firing zone is 1250-1350°C, the rotating speed of the rotary kiln is 1.3r / min, and the temperature of the kiln tail smoke chamber is 900—950°C, pressure -180——190Pa; outlet temperature of preheater: 270—280°C, inlet pressure: -190——200Pa, outlet pressure: -7300——7500Pa; kiln hood temperature: 780 —800°C; the calcination time is 2.5h, and the sintered material is generated after the calcination is completed;

[0031] c. Wet grinding and filtering: Add demineralized water to the sintered material for wet grinding, the liquid-solid ratio is 1.85:1,...

Embodiment 3

[0036] a. Abrasives and ingredients: Grind APT waste low-grade tungsten slag to -125 mesh ≥ 90%, take WO 3 100kg of waste low-grade tungsten slag material with a grade of 6% is blended, and then the batching is carried out. The addition of soda in the batching is 8.4kg, and the addition of saltpeter in the batching is 0.126kg;

[0037] b. Calcining of slag: Calcining the slag prepared in step a in a rotary kiln, the temperature of the firing zone is 1100-1250°C, the rotating speed of the rotary kiln is 0.9r / min, and the temperature of the kiln tail smoke chamber is 850—900°C, pressure -150——180Pa; outlet temperature of preheater is 245—270°C, inlet pressure is -140——190Pa, outlet pressure is -7100——7300Pa; kiln head cover temperature is 750 —780°C; the calcination time is 1.8h, and the sintered material is formed after the calcination is completed;

[0038] c. Wet grinding and filtering: Add demineralized water to the sintered material for wet grinding, the liquid-solid ratio...

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Abstract

The invention belongs to the field of tungsten resource recycling, and particularly relates to a method for regenerating APT (ammonium paratungstate) by the use of waste low-grade tungsten slag in an APT production process. The invention discloses a method for regenerating APT by use of APT waste low-grade tungsten slag, which is realized by improving the technological parameters of the traditional soda sintering method and comprises the following steps of: (a) grinding and dosing; (b) slag calcining; (c) wet grinding and filtering; (d) two-secondary ion exchange and impurity removal; and (e) evaporating and crystallizing to generate APT. The method provided by the invention can reduce resource waste, improve the utilization rate of resources, and can increase the economic benefits of an enterprise by recycling the APT waste low-grade tungsten slag; the method is suitable for treating the waste low-grade tungsten slag of which the WO3 grade is 2-10%, overcomes the shortcomings of the technology matching the waste and the tungsten concentrate raw material, and can effectively improve the recovery rate of tungsten and reduce environmental pollution; and through the invention, the service life of the tungsten resource of the country can be prolonged, the current situation of shortage in tungsten resource is relieved, the emission of waste can be effectively reduced, and environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the field of recovery and reuse of tungsten resources, and specifically relates to a method for regenerating APT by using waste low-grade tungsten slag produced in the production process of APT (ammonium paratungstate). Background technique [0002] Tungsten ore is one of the advantageous mineral resources in our country. Due to the blind expansion of the tungsten industry, the indiscriminate mining of tungsten enterprises and the emergence of a large number of new tungsten smelting enterprises, the predatory exploitation of tungsten ore resources has made the advantages of tungsten ore resources in our country increasingly Gradually disappear, the resource crisis is highlighted. At present, as tungsten resources become more and more complex and difficult to select, all kinds of high-impurity and low-grade tungsten ores will become the main source of raw materials for tungsten smelting enterprises in the future. [0003] Ammon...

Claims

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Application Information

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