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Oxidation roasting method of hard zinc vacuum smelting slag

A technology of vacuum smelting and oxidative roasting, applied in the direction of improving process efficiency, can solve the problems of heavy alloy proportion, large amount of oxidant, less than 20%, etc., and achieve high heat utilization rate, high oxidation efficiency and strong uniformity. Effect

Active Publication Date: 2020-02-07
六盘水中联工贸实业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the rotary kiln is better than the reverberatory furnace, the turning is not thorough, especially when there is a molten state or agglomeration, it is difficult to turn the material
[0005] Therefore, when the rotary kiln or reverberatory furnace is used to oxidize and roast vacuum smelting slag, there are problems such as large amount of oxidant, long roasting time and low efficiency.
Some people have studied this kind of material without oxidation treatment, directly using high acid leaching at a temperature above 90°C, adding an oxidant above 150g / L, the leaching rate of germanium and indium is less than 20% after leaching for 4 hours, and the leaching rate of germanium and indium is less than 20% after leaching for 8 hours. less than 40%
Moreover, the alloy has a large specificity, and strong stirring is required for leaching

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The hard zinc vacuum smelting slag produced by an electric furnace zinc smelting plant contains 10-30% iron, 5-8% lead, 1-2% zinc, 0.5-2.5% germanium, 1-5% indium, and 200-500g / t silver . Through phase analysis, 90% of iron exists in the state of iron alloy, and more than 98% of lead exists in the state of lead alloy. Germanium, indium, silver, zinc, etc. 90-95% exist in iron alloys and lead alloys. Grind to a particle size of 1mm, then add 27.5% hydrogen peroxide to mix evenly according to hydrogen peroxide / iron+lead=1.2. Put it into a microwave oven, adjust the microwave frequency to 2.5-5GHz, the power is 750-1000W, and the radiation time is 30 minutes, and take samples for phase analysis. The iron alloy phase is reduced to 5.2%, the lead alloy phase is reduced to 8.5%, leaching with hydrogen peroxide at liquid / solid=5, 90-95°C for 1 hour, the leaching rate of germanium and indium is 85.3%, the leaching rate of zinc is 95.2%, and the leaching lead slag contains Ir...

Embodiment 2

[0025] The vacuum smelting slag produced by a zinc pyrometallurgy enterprise contains 25-35% iron, 2.5-6.5% lead, 3% zinc, 1.5-3% germanium, and 5-6% indium. Through phase analysis, germanium, indium 85% of iron, lead and zinc exist in an alloy state. After crushing to 0.5-1mm, add manganese dioxide according to manganese dioxide / iron+lead=1.5 and mix evenly. Then put it in a microwave oven and adjust the microwave frequency to 5-10GHz. The power is 1000-1500W, and the irradiation time is 50 minutes. Samples are taken for phase analysis. The iron alloy phase is reduced to 2.3%, and the lead alloy phase is reduced to 4.8%. Using 8-10N hydrochloric acid for chlorination distillation, the chlorination distillation rate of germanium is 98.5%, and the chlorination leaching rate of indium is 98.2%. The chloride leaching rate of lead and silver is 95.3%.

Embodiment 3

[0027] Use the vacuum smelting slag of Example 1 to carry out natural stacking without mixing oxidants for 30 days, carry out phase analysis, the natural oxidation rate of iron and lead alloys is all less than 5%, after mixing hydrogen peroxide / iron+lead=1.5, normal temperature stacking is natural for 30 days, According to the phase analysis, the oxidation rate of iron and lead alloys is 10-15%. According to the above ratio, after mixing hydrogen peroxide and roasting in an electric furnace at 500-600°C for 2 hours, the oxidation rate of iron and lead alloys is 15-18%. The hourly oxidation rate increases to 25-26.3%. The oxidation rate increased to 30% after roasting for 8 hours. Continue roasting for 12 hours, and the oxidation rate increases to 31.5%. After 16 hours, the oxidation rate was 32%. Using manganese dioxide as the oxidant, the oxidation rate was only 25.3% after 16 hours. Increase the roasting temperature to 800-1000°C, use hydrogen peroxide as the oxidizing age...

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PUM

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Abstract

The invention discloses an oxidizing roasting method of hard zinc vacuum smelting furnace slag. Based on the characteristic that hydrogen peroxide, manganese dioxide, chlorate and other oxidants havehigh microwave absorbability and the principle that the low-frequency microwave radiation penetrating power is high, ferric oxide and lead oxide are also matter with high microwave absorbability, hydrogen peroxide or manganese dioxide or chlorate is added into the broken hard zinc vacuum smelting furnace slag according to the quantity being 1-1.5 times of the total quantity of iron and lead, the materials are mixed to be uniform, microwaves with the frequency of 2-10 GHz and the power of 500-2,000 W are used for radiation for 20-60 min, the temperature is controlled to be 300-500 DEG C, and the oxidation rate of ferric alloy and lead alloy in the vacuum smelting furnace slag reaches 95% or above. After the vacuum smelting furnace slag in an alloy state is mixed with the oxidants, microwaves can be efficiently absorbed, instant high temperature is generated, and the alloy is rapidly and uniformly oxidized into metal oxides, so that hydrometallurgy leaching is promoted. The oxidizing roasting method has the characteristics that in microwave fields, the heat utilization rate is high, the time is short, the energy consumption is low, cleanliness is achieved, and materials and environments cannot be polluted.

Description

technical field [0001] The invention belongs to the technical field of microwave metallurgy, and in particular relates to a method in which hard zinc containing germanium, indium, zinc, iron and lead, which is a by-product of pyrometallurgy, is oxidized and roasted by using microwave radiation to oxidize and roast the remaining slag after evaporating zinc in a vacuum furnace. Background technique [0002] Materials containing germanium, indium, zinc, iron, and lead are smelted in pyroelectric furnace or vertical tank, so that germanium, indium, zinc, and lead are enriched in metal crude zinc, and then smelted by silicon carbide tray pyrolysis to purify While obtaining refined zinc, hard zinc containing germanium, indium, zinc, iron, and lead is also produced by-product, and the hard zinc is in an alloy state. Melting in a vacuum furnace is the best way to process this alloy. After vacuum distillation of more than 99% of metallic zinc, the resulting slag is mainly ferroalloy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B7/04C22B41/00C22B58/00C22B13/02
CPCC22B1/02C22B7/04C22B13/025C22B13/045C22B41/00C22B58/00Y02P10/20
Inventor 刘洪波王振杰刘安荣钟先杰钟波李世平
Owner 六盘水中联工贸实业有限公司
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