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Method for preparing high purity zinc through calamine vacuum carbothermic reduction

A hemimorphite and vacuum technology, applied in the field of high-purity metal zinc, zinc-containing metal lead, coal tar, and metal cadmium, can solve the problems of low purity of metal zinc, limitations of industrial application, unsatisfactory technology, etc. Achieve the effect of lowering the critical temperature and speeding up the reaction speed

Inactive Publication Date: 2014-10-01
JISHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although calcium fluoride is used as a catalyst to speed up the reaction rate and obtain metal zinc, it cannot effectively reduce the critical temperature of the carbothermal reduction reaction, causing the reaction temperature to reach more than 1100 ° C, and the obtained metal zinc has a low purity. Also did not carry out detection and examination, thus has been subjected to greater restriction in aspect of industrialization application, and existing technology is unsatisfactory

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  • Method for preparing high purity zinc through calamine vacuum carbothermic reduction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Material preparation: Hemimorphite, coking coal, and compound additives are ground to 160 mesh, mixed, added with water, mixed thoroughly, pelletized, and dried.

[0021] The molar ratio of carbon in the coking coal and zinc in the hemimorphite is 1.8; the composite additive is a mixture of calcium fluoride and calcium oxide, and the molar ratio of calcium oxide and calcium fluoride is 2.0; the mass fraction of the composite additive in the total material 15%.

[0022] (2) Sintering: Utilizing the coking characteristics of coking coal, the dried sample was sintered in a muffle furnace at 510 °C for 60 min to make the sample have certain strength and porosity.

[0023] (3) Vacuum carbothermal reduction distillation and graded condensation: put the sintered material into the vacuum furnace, turn on the cooling water to evacuate the system until the system pressure is 6 Pa, start heating and heating, until the reaction temperature is 960 ° C, the pressure in the furnac...

Embodiment 2

[0025] (1) Material preparation: Hemimorphite, coking coal, and compound additives are ground to 80 mesh, mixed, added with water, mixed thoroughly, pelletized, and dried.

[0026] The mol ratio of carbon in the coking coal and zinc in the hemimorphite is 2.9; the composite additive is a mixture of calcium fluoride and calcium oxide, and the mol ratio of calcium oxide and calcium fluoride is 2.1; the mass fraction of the composite additive in the total material is 19%.

[0027] (2) Sintering: Utilizing the coking characteristics of coking coal, the dried sample was sintered in a muffle furnace at 670 °C for 30 min to make the sample have certain strength and porosity.

[0028] (3) Vacuum carbothermal reduction distillation and graded condensation: put the sintered material into the vacuum furnace, turn on the cooling water to evacuate the system until the system pressure is 7 Pa, start heating and heating, until the reaction temperature is 1040 ° C, the pressure in the furnace...

Embodiment 3

[0030] (1) Material preparation: Hemimorphite, coking coal, and compound additives are ground to 120 mesh, mixed, added with water, mixed thoroughly, pelletized, and dried.

[0031] The mol ratio of carbon in the coking coal and zinc in the hemimorphite is 2.1; the composite additive is a mixture of calcium fluoride and calcium carbonate, and the mol ratio of calcium carbonate and calcium fluoride is 1.82; the mass fraction of the composite additive in the total material is 11%.

[0032] (2) Sintering: Utilizing the coking characteristics of coking coal, the dried sample was sintered in a vacuum furnace at 600 °C for 45 min to make the sample have certain strength and porosity.

[0033] (3) Vacuum carbothermal reduction distillation and graded condensation: put the sintered material into the vacuum furnace, turn on the cooling water to evacuate the system until the system pressure is 5 Pa, start heating and heating, until the reaction temperature is 1000 ° C, the pressure in t...

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Abstract

The invention discloses a method for preparing high purity zinc through calamine vacuum carbothermic reduction. The method comprises the following steps: (1) grinding hemimorphite, coking coal and a composite additive to be 60-200 meshes, mixing, adding water to be mixed well, briquetting, and drying; (2) sintering the dried sample in a muffle furnace or a vacuum furnace at 500-700 DEG C for 3-60 min; (3) putting the sintered material into the vacuum furnace, heating when the pressure is 5-10 Pa until the reaction temperature is 950-1050 DEG C, controlling the pressure in the furnace to be 50-2500 Pa, preserving heat for 30-50 min, cooling to the room temperature, and blowing on so as to obtain the high purity metal zinc, metal cadmium, zincy lead and coal tar. Through the addition of compound additives such as calcium fluoride and calcium oxide, the reaction process is accelerated, the reaction temperature is reduced from 1100 DEG C to 950-1050 DEG C, the energy consumption is reduced, the equipment requirements are reduced, and the safety and operability are improved.

Description

Technical field [0001] The present invention involves a method of preparation of high -pure zinc in heterocariac carbon thermal reduction. Specifically refers to the use of coke coal reducing agents and adhesives. After adding composite additives, it is distilled.Cadmium, zinc -containing metal lead and coal tar. Background technique [0002] Zinc is an important non -ferrous metal. my country's zinc resources ranks first in the world. According to statistics at the end of 2004, the geological ownership of zinc in my country is 92 million tons. The resources are widely distributed, almost all over the country, especially Yunnan. [0003] The production and consumption of zinc in my country account for more than 30%of the world, and it is currently the world's largest zinc production and consumer country.However, most of the raw materials of zinc refining are flotal zinc sulfide ore. However, with the development and utilization of zinc ore resources, zinc sulfide ore has become i...

Claims

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Application Information

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IPC IPC(8): C22B19/06
Inventor 熊利芝何则强刘志雄向延红
Owner JISHOU UNIVERSITY
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