Vacuum smelting method of zinc oxide ore

A technology for vacuum smelting and zinc oxide ore, applied in the field of metallurgy, can solve the problems of high environmental protection treatment cost, low zinc alkali leaching rate and high production cost, and achieve the effects of short smelting time, reduced reduction smelting temperature and high sealing degree

Active Publication Date: 2018-10-12
GUIZHOU HONGDA ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkaline leaching of low-grade zinc oxide ore is directly carried out with sodium hydroxide or ammonia water. Although the process requirements for beneficiation and rotary kiln redox volatilization and enrichment are avoided, the alkaline leaching rate of zinc is low, and the recovery rate of zinc is only 70-80%. , the alkali consumption is large, and the obtained zinc products are mainly zinc powder or small broken zinc pieces, and the casting rate is low
Production costs are high, and alkaline leaching solutions containing silicates are not easy to handle after zinc extraction
Although the hydrometallurgy of zinc oxide materials is superior to pyrometallurgy, for low-grade zinc oxide ore, the process is long, the amount of three wastes (waste residue, waste water, waste gas) is large, and the cost of environmental protection treatment is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: Fabrication and installation of vacuum smelting furnace

[0022] Process and manufacture a vacuum smelting furnace, the shell is made of iron material, the furnace is equipped with a vacuum smelting chamber and a metal zinc liquid collection pool, the upper side walls are all made of porcelain bricks, and the lower part is processed with a layer of silicon carbide material on the porcelain plate. Three groups of microwave radiation elements are installed on the upper part of the vacuum smelting chamber, with a total power of 20kW. A zinc vapor corrosion-resistant metal condensation plate and a vacuum exhaust pipe are installed on the upper part of the liquid collection tank. The bottom is connected with each other and zinc sealing bricks are installed. The vacuum furnace is also equipped with a feeding port, a slag outlet, an inspection furnace door and a molten zinc ingot casting furnace door. Two 5kW vacuum pumps are installed to connect with the exhaust ...

Embodiment 2

[0023] Embodiment 2: the vacuum smelting method of zinc oxide ore

[0024] Zinc oxide material with a zinc grade of 30-40% is used, coke powder is added according to carbon / zinc = 1.2, and then pulp with a weight of 6% of the raw material is added, mixed and granulated, and dried. Then put it into the vacuum smelting furnace 50mm below the height of the silicon carbide partition wall, seal the vacuum furnace, and vacuumize to 400Pa-600Pa, then turn on the microwave radiation, adjust the microwave radiation frequency to 200GHz, power 15kW, when the temperature in the furnace reaches 500℃ , turn on the condensing circulating water, and control the smelting temperature to 600-700°C. After the smelting time reaches 120 minutes, turn off the microwave power supply, cool down to 480°C-500°C, turn off the vacuum pump and feed nitrogen to relieve the vacuum, and take the slag and metal zinc liquid for analysis and testing . The slag contains 1.2% zinc, the metal zinc quality is 98.75...

Embodiment 3

[0025] Embodiment 3: the vacuum smelting method of zinc oxide ore

[0026] Grind to 100 meshes with low-grade zinc oxide ore containing 11.3% zinc, then mix with carbon black powder of carbon / zinc=1.5, granulate and dry with 6% pulp, join in the vacuum furnace of example 1, press vacuum The temperature is 200-400pa, the microwave frequency is 50GHz, the power is 20kW, the vacuum smelting temperature is 700-800℃, and the smelting time is 180 minutes for vacuum smelting. After smelting, the obtained slag contains 0.35% zinc, the quality of metal zinc is 96.3%, the recovery rate of zinc smelting is 95.2%, and the energy consumption of smelting is 3200kWh / ton of zinc.

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Abstract

The invention provides a vacuum smelting method of zinc oxide ore. The vacuum smelting method comprises the steps of mounting vacuum microwave smelting equipment and conducting smelting operation. Byutilizing the characteristics that the melting boiling point of metal zinc in a vacuum state is greatly reduced and a zinc oxide material can absorb microwave radiation to produce instantaneous high temperature and catalyze reduction reaction of zinc oxide after mixing carbon powder, the method reduces the reduction smelting temperature of zinc oxide and can uniformly do the reduction reaction from the inner part of a granulating briquette together inside and outside, and no heat conduction process exists. Meanwhile, when microwaves radiate in a vacuum, no energy loss exists, and the microwaves can be quickly absorbed by zinc oxide particles. Thus, the method can perform low-energy high-efficiency smelting.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a vacuum smelting method of zinc oxide ore. Background technique [0002] At present, there are two smelting methods and technologies for zinc oxide materials: pyro-smelting and hydro-smelting. Pyrometallurgical smelting mainly includes reduction smelting in electric furnace, reduction smelting in horizontal tank and vertical tank, and reduction smelting in climbing furnace or gossip furnace for pottery clay shells. Reduction smelting using electric arc, coal gas, natural gas, and coal as heating energy. Due to external heating, there is a gradient in heat conduction, low heat utilization rate, high energy consumption, and when the temperature is below 1000 ℃, it is easy to form silica glass on the surface of the material to wrap the material, and the recovery rate of zinc smelting is low. In order to improve the recovery rate, the smelting temperature must be in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/00
CPCC22B19/00
Inventor 李世平卢宇王志斌韦国龙
Owner GUIZHOU HONGDA ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
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