Method for efficiently removing fluorine-chlorine impurities in zinc oxide smoke

A zinc oxide and removal technology, applied in the field of metallurgy, can solve the problems of large fuel consumption, difficult wastewater treatment, and large water resource consumption, and achieve the effects of improving bed capacity, improving recovery, and improving heat utilization rate

Inactive Publication Date: 2017-05-17
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-temperature roasting removal method has a fluorine removal rate of over 90%, a chlorine removal rate of over 80%, and a good removal effect, but the equipment investment is large, the fuel consumption is large, and the processing cost is high; the alkali washing method defluorination The rate can reach 90%, the equipment and operation are simple, but the loss of zinc is large, the consumption of water resources is large, and the wastewater is difficult to treat; the removal of zinc sulfate solution will cause a certain amount of metal loss, and the defluorination effect is not good

Method used

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  • Method for efficiently removing fluorine-chlorine impurities in zinc oxide smoke
  • Method for efficiently removing fluorine-chlorine impurities in zinc oxide smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for efficiently removing fluorine and chlorine impurities in zinc oxide smoke dust comprises the following steps:

[0027] (1) Open the slag inlet 10, add 40t of reduced slag (Pb1-6%, Zn5-12%) into the smelting chamber 1, and close the slag inlet 10;

[0028] (2) Open the tuyere 8 and tertiary tuyere 9 of the smelting-volatilization compound furnace, pulverized coal and oxygen-enriched air are blown into the tuyere 8, air is blown into the tertiary tuyere 9, and the air volume blown in by the tuyere 8 of the smelting chamber 1 is adjusted to 8000m 3 / h, wind pressure 180KPa, oxygen-enriched concentration 23%, pulverized coal volume 1.3t / h; adjust the air volume blown into the volatilization chamber 2 blast outlet 8 to 10000m 3 / h, wind pressure 180KPa, oxygen enrichment concentration 23%, pulverized coal amount 2.0t / h;

[0029] (3) Add acid leaching residue (containing 3-8% of lead, 8-18% of zinc, and 6-12% of sulfur) from the cold feed inlet 11 at a rate of 1...

Embodiment 2

[0034] A method for efficiently removing fluorine and chlorine impurities in zinc oxide smoke dust comprises the following steps:

[0035] (1) Open the slag inlet 10, add 30t of reduced slag (Pb2-5%, Zn6-14%) into the smelting chamber 1, and close the slag inlet 10;

[0036] (2) Open the tuyere 8 and tertiary tuyere 9 of the smelting-volatilization compound furnace, pulverized coal and oxygen-enriched air are blown into the tuyere 8, air is blown into the tertiary tuyere 9, and the air volume blown into the 1st tuyere 8 of the smelting chamber is adjusted to 10000m 3 / h, wind pressure 160KPa, oxygen enrichment concentration 21%. The amount of pulverized coal is 1.5t / h; adjust the air volume blown into the volatilization chamber 2 blast outlet 8 to 12000m 3 / h, wind pressure 160KPa, oxygen enrichment concentration 21%, pulverized coal amount 2.2t / h;

[0037] (3) Add acid leaching residue (containing 3-10% of lead, 4-12% of zinc, and 8-10% of sulfur) from the cold feed inlet 1...

Embodiment 3

[0042] A method for efficiently removing fluorine and chlorine impurities in zinc oxide smoke dust comprises the following steps:

[0043] (1) Open the slag inlet 10, add 60t of reduced slag (Pb3-7%, Zn8-14%) into the smelting chamber 1, and close the slag inlet 10;

[0044] (2) Open the tuyere 8 and the tertiary tuyere 9 of the smelting-volatilization compound furnace, the tuyere 9 blows in pulverized coal and oxygen-enriched air, and the tertiary tuyere 9 blows in air. Adjust the air volume blown into the smelting chamber 1 blast outlet 8 to 12000m 3 / h, wind pressure 200KPa, oxygen-enriched concentration 25%, pulverized coal volume 1.6t / h; adjust the air volume blown into the volatilization chamber 2 blast outlet 8 to 14000m 3 / h, wind pressure 200KPa, oxygen enrichment concentration 25%, pulverized coal amount 2.2t / h;

[0045] (3) Add acid leaching slag lead (4-8%, zinc 6-18%, sulfur-containing 4-8%) from the cold feed inlet 11 at a rate of 18t / h;

[0046] (4) Adjust the ...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a method for efficiently removing fluorine-chlorine impurities in zinc oxide smoke. The method for efficiently removing the fluorine-chlorine impurities in the zinc oxide smoke comprises the following steps of (1) oxidization smelting, (2) reductive volatilization, and (3) furnace slag discharging. According to the method for efficiently removing the fluorine-chlorine impurities in the zinc oxide smoke, after acid-leached slag is subjected to oxidization smelting, the impurities such as fluorine, chlorine and sulfur in the zinc oxide smoke can be removed in the smelting stage, fluorine and chlorine in the zinc oxide smoke can be effectively removed, the treatment cost of the zinc oxide smoke is reduced, energy is saved, the purposes of environmental friendliness and comprehensive utilization of resources are achieved, and melting of the acid-leached slag is accelerated in the smelting stage; volatilization of valuable metal such as zinc is reduced while the impurities such as fluorine and chlorine are effectively removed; and the interior of a volatilization chamber is in a reducing atmosphere, a large amount of CO is generated, high reducibility is kept, the volatilization efficiency for lead and zinc is improved easily, and the recovery rate of the valuable metal is increased.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for efficiently removing fluorine and chlorine impurities in zinc oxide dust. Background technique [0002] The methods for removing fluorine and chlorine from zinc oxide fume mainly include: high-temperature roasting to remove fluorine and chlorine (multiple hearth furnace, rotary kiln), alkali washing method to remove fluorine and chlorine, zinc sulfate solution to remove fluorine and chlorine, etc. The high-temperature roasting removal method has a fluorine removal rate of over 90%, a chlorine removal rate of over 80%, and a good removal effect, but the equipment investment is large, the fuel consumption is large, and the processing cost is high; the alkali washing method defluorination The efficiency can reach 90%, the equipment and operation are simple, but the loss of zinc is large, the consumption of water resources is large, and the wastewater is d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B19/30C22B13/02
CPCC22B7/001C22B7/02C22B13/025C22B19/30Y02P10/20
Inventor 马雁鸿贾著红罗永光蒋荣生张良红李衍林俞兵吴红林代龙果薛灿马绍斌王瑞山
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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