Process for removing chloride from zinc dross

A zinc scum and removal technology, which is applied in the field of comprehensive utilization of slag, can solve the problems of low efficiency and high production cost, and achieve the effect of comprehensive utilization

Inactive Publication Date: 2005-09-07
云南会泽铅锌矿
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  • Abstract
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Problems solved by technology

However, the efficiency of this method is not high, the produc...

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  • Process for removing chloride from zinc dross

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Embodiment 1

[0029] Add zinc scum with chlorine content of 1.891%, zinc content of 74.51%, dry weight of 5.01 tons, and moisture content of 25% in the rotary kiln, and feed the above-mentioned water gas as fuel, and the amount of gas introduced is calculated according to the amount of gas (Nm 3 ): zinc scum (dry weight, ton)=(400~500): 1. Gas outlet pressure is 30mmH 2 O, the prepared water gas contains 3.5% water vapor, and the blast pressure is 70mmH 2 O, the average total heating (residence) time of zinc scum from the kiln tail to the kiln head in the rotary kiln is 3 hours, the high temperature zone temperature of the rotary kiln is 1150 ℃, and the material is 30 minutes in the high temperature residence time to obtain chlorine content 0.047%, zinc Dechlorinated zinc oxide with a content of 76.15%, the zinc oxide weighs 4.51 tons.

Embodiment 2

[0031] Put chlorine content 2.551%, zinc content 74.48%, dry weight 6.53 tons, water content is 24.5% zinc scum into the rotary kiln, pass into the above-mentioned water gas combustion, gas feed rate according to gas volume (Nm 3 ): zinc scum (dry weight, ton)=(400~500): 1. Gas outlet pressure is 35mmH 2 O, the prepared water gas contains 7.6% water vapor, and the blast pressure is 80mmH 2 O, the total heating (residence) time of zinc scum in the rotary kiln was 3 hours, the high temperature zone temperature of the rotary kiln was 1200 ℃ of temperature, and the high temperature residence time was 45 minutes to obtain the dechlorinated zinc oxide of chlorine content 0.044%, zinc content 76.23%, Zinc oxide weighs 5.88 tons.

Embodiment 3

[0033] Add zinc scum with chlorine content of 2.652%, zinc content of 74.71%, dry weight of 5.65 tons, and moisture content of 27.35% in the rotary kiln, and feed the above-mentioned water gas for combustion. 3 ): zinc scum (dry weight, ton)=(400~500): 1. Gas outlet pressure is 40mmH 2 O, the prepared water gas contains 9.8% water vapor, and the blast pressure is 80mmH 2 O, zinc scum total heating (residence) time 3 hours in rotary kiln, 1100 ℃ of temperature of high temperature band temperature of rotary kiln, high temperature residence time 60 minutes, obtain the dechlorination zinc oxide of chlorine content 0.049%, zinc content 76.33%, Zinc oxide weighs 5.10 tons.

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Abstract

A chlorine peeling method in zinc dross. The steps comprises adding zinc dross, which contains more than 1.8% chlorine and 20-30% water, into rotary kiln; blowing air and fuel of coal gas that contains 3-10% steam, in which inward flux of coal gas accords to coal content (Nm3) : zinc dross (dry weight, t) =(400-500):1, discharge pressure of coal gas is 30-40mmH2O and blast pressure is 30-120mmH2O; using steam in coal gas and partial oxygen to achieve to antichloration and zinc dross staying in rotary kiln for 3h from head to tail, in which when rotary kiln heating-up to 1000-1200 Deg. C, staying in hot zone for 30-90 minutes. The method effectively expels chlorine in zinc dross and achieves comprehensive utilization of zinc dross. The content of chlorine in zinc oxide after antichloration drops to less than 0.05%, ratio of antichloration is more than 98% and content of calcine zine exceeds 77.0% (ZnO>95.0%).

Description

technical field [0001] The invention relates to a process technology for comprehensive utilization of slag produced in a cathode zinc casting process in zinc hydrometallurgy, in particular to a process for removing chlorine in zinc scum. Background technique [0002] At present, more than 75% of zinc in my country is produced by hydrometallurgy. In the zinc hydrometallurgy process, a certain amount of zinc scum is produced as a by-product, which is the slag formed by zinc oxide formed in the process of casting electrolytic cathode zinc into zinc ingots and entraining a certain amount of metallic zinc particles. This kind of oxidized slag reduces the melting and casting yield of zinc due to the entrained part of zinc; in order to improve the direct yield of melting and casting of cathodic electrodeposited zinc sheet, a small amount of NH is also added in the casting process 4 Cl, the purpose is to destroy the zinc oxide wrapped with zinc, so that the zinc can be melted into ...

Claims

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Application Information

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IPC IPC(8): C22B9/05
Inventor 罗恒杨大锦刘建平彭建蓉浦少俊
Owner 云南会泽铅锌矿
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