CN103555966B - Method for producing zinc hypoxide powder in rotary kiln by taking blast furnace smoke as raw material - Google Patents
Method for producing zinc hypoxide powder in rotary kiln by taking blast furnace smoke as raw material Download PDFInfo
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- CN103555966B CN103555966B CN201310490196.2A CN201310490196A CN103555966B CN 103555966 B CN103555966 B CN 103555966B CN 201310490196 A CN201310490196 A CN 201310490196A CN 103555966 B CN103555966 B CN 103555966B
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Abstract
The invention provides a method for producing zinc hypoxide powder in a rotary kiln by taking blast furnace smoke as a raw material. The method comprises a step of performing high-temperature fuming treatment on a furnace inlet raw material to produce zinc hypoxide powder in the rotary kiln, and is characterized in that the furnace inlet raw material is prepared by the following steps: uniformly mixing the following raw materials in percentage by mass: 50-60 percent of blast furnace smoke dust, 20-40 percent of settlement powder, 8-15 percent of returned dust and 5-8 percent of lime, and controlling the moisture content of the mixture to be 16-22 mass percent; preparing pellets according to a conventional method, thus obtaining the pelletized furnace inlet raw material. Therefore, the blast furnace smoke becomes a renewable resource, a valuable zinc element is recovered, the problem that environmental pollution is caused because the blast furnace smoke is discharged outwards and stored is properly solved, the air permeability of materials in the rotary kiln is obviously improved due to the prepared pellets, the comprehensive energy consumption is reduced, ring forming in the kiln is avoided, the service life of the kiln is effectively prolonged, the production efficiency is improved, and the production cost is reduced.
Description
Technical field
The present invention relates to a kind of production method of oxide powder and zinc, especially one is with iron-smelting blast furnace flue dust-gas plaster for raw material, and the method for oxide powder and zinc produced by rotary kiln, belongs to blast furnace dust technical field of comprehensive utilization.
Background technology
In blast furnace production process, usually supervene a large amount of blast furnace dusts-gas plaster.Due to the zinc containing recoverable in blast furnace dust, therefore, how effectively fully utilizing blast furnace dust, reclaim valuable element, is the problem that manufacturing enterprise makes great efforts tackling key problem for a long time.Wherein a technology is after being mixed with coke powder by blast furnace dust, sends in rotary kiln, after high temperature fuming art breading, obtains this product of Second-rate zinc oxide powder, make the zinc in blast furnace dust obtain efficient recovery and utilization.But there is following deficiency in this technology existing: one, because the grade of blast furnace dust is thinner, in roasting process in rotary kiln, because of material ventilation property extreme difference, cause coke powder fuel in roasting process, because of incomplete combustion, and be difficult to the reduction reaction envrionment temperature providing 1100 DEG C, be difficult to the effect playing reductive agent simultaneously, can not effectively improve thermo-efficiency and reaction efficiency, in addition expecting grain clinkering rolling situation for improving in kiln, more breeze need be had to check melt polymerization and absorb meltable FeS, cause energy consumption to remain high.Two, because material component is complicated, especially containing SiO
2and have plumbous existence, can low melting point eutectic be formed, the rolling of material after fusing, will be hindered; Simultaneously there is sulphur to exist because of the iron containing volume, iron sulphide FeS can be formed, and FeS is meltable, make the clinkering of material grain and increase rolling difficulty, add that grain size of raw material is comparatively thin, be easy to be attached on the material grain of semi-melting state, cause in preheating zone and reaction zone, (i.e. temperature range junction) between reaction zone and cooling zone, form ring junction material strip, the normal production run of serious obstruction, and uncontrollable, therefore, knot kiln is serious, and work-ing life kiln phase shortens.
Summary of the invention
The object of the present invention is to provide a kind of good permeability, furnace charge does not tie kiln, and thermo-efficiency utilizes high, reaction efficiency good with iron-smelting blast furnace flue dust-gas plaster for raw material, produce the method for oxide powder and zinc with rotary kiln.
The present invention is completed by following technical proposal: a kind of method taking blast furnace dust as raw material rotary kiln and produce oxide powder and zinc, comprise the step that rotary kiln high temperature fuming process feed stock for blast furnace produces Second-rate zinc oxide powder, it is characterized in that feed stock for blast furnace obtains through the following step:
A, by following masses % for raw material:
Blast furnace dust 50 ~ 60%
Sedimentation powder 20 ~ 40%
Back powder 8 ~ 15%
Lime 5 ~ 8%;
B, fully mixed by the standby raw material of steps A institute, controlling mixture moisture content is 16 ~ 22% mass ratioes;
C, the compound of step B is made pelletizing routinely, stove pellet feed must be entered.
Described sedimentation powder is the dust reclaimed from the fly-ash separator conventional stove production line.
Described back powder is the dust reclaimed from the surface cooler conventional stove production line.
The add-on of described lime is with SiO in compound
2: CaO=2: 1 weight ratio is advisable, to improve the temperature of fusion of material, avoid ramming material in kiln.
The control of described mixture moisture content, is advisable with 16 ~ 22% mass ratioes, and moisture content is large lower than 16% airborne dust, and cause loss of material, moisture content very easily sticks on ball die wall in balling process higher than 22% material, and affects normal pelletizing.
Select add CaO, can effectively in gas mud middle acid substance SiO
2, avoid ramming material in kiln, the chemical erosion of raw material to kiln lining can be slowed down simultaneously.
The present invention not only makes blast furnace dust---and gas plaster becomes renewable resource, solve zinc element in iron manufacturing process, because of circulation collection to the disadvantageous effect that blast furnace causes, simultaneously also properly settled blast furnace dust---gas plaster because of outer row, store up and cause the problem of environmental pollution, the pellet feed made significantly improves the material permeability in rotary kiln, comprehensive energy consumption is obviously reduced, kiln condition is stablized controlled, no longer ring formation in kiln, effectively extend work-ing life kiln phase, improve production efficiency, reduce production cost.
The economic benefit realized is as follows:
1, breeze 0.185 ton saved by pure ball material per ton, reduces production cost 138.75 yuan/ton, cost declining 184.8 ten thousand yuan/year;
2, after entering kiln roasting, breeze consuming cost 34.6 ten thousand yuan/year (3.46 ten thousand yuan/month × October) is saved;
3, increase material treatment capacity 18%, improve product recovery rate 4%, increase income 10.47 ten thousand yuan/year (1.87 tons/month × 5600 yuan/ton × October).
More than add up to cost declining 219.4 ten thousand yuan/year, increase income 10.47 ten thousand yuan/year, economic benefit and social benefit remarkable.
Embodiment
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1
Blast furnace dust used---gas mud chemical composition is as follows:
A, by following masses % for raw material:
Lime is added to SiO in compound
2: CaO=2: 1
Blast furnace dust 50%
Sedimentation powder 40%
Back powder surplus;
B, fully mixed by the standby raw material of steps A institute, controlling mixture moisture content is 16% mass ratio;
C, the compound of step B is made pelletizing routinely, stove pellet feed must be entered;
D, the stove pellet feed that enters of step C to be sent in rotary kiln, under following reduction volatilization condition: temperature is 1150 DEG C, rotating speed is 1 turn/2 minutes, roasting 2 hours, the volatilization such as valuable metal Zn, Pd, Cd, In, Bi enters in gas phase, by reclaiming surface cooler, bagroom, obtains Second-rate zinc oxide powder, obtain the kiln slag of the rotary kiln by-product that can again utilize, the chemical composition of gained Second-rate zinc oxide powder sees the following form simultaneously:
Embodiment 2
Blast furnace dust used---gas mud chemical composition is as follows:
A, by following masses % for raw material:
Lime is added to SiO in compound
2: CaO=2: 1
Blast furnace dust 60%
Sedimentation powder 20%
Back powder surplus;
B, fully mixed by the standby raw material of steps A institute, controlling mixture moisture content is 22% mass ratio;
C, the compound of step B is made pelletizing routinely, stove pellet feed must be entered;
D, the stove pellet feed that enters of step C to be sent in rotary kiln, under following reduction volatilization condition: temperature is 1250 DEG C, rotating speed is 1 turn/2 minutes, roasting 2 hours, the volatilization such as valuable metal Zn, Pd, Cd, In, Bi enters in gas phase, by reclaiming surface cooler, bagroom, obtains Second-rate zinc oxide powder, obtain the kiln slag of the rotary kiln by-product that can again utilize, the chemical composition of gained Second-rate zinc oxide powder sees the following form simultaneously:
Claims (2)
1. be the method that Second-rate zinc oxide powder produced by raw material rotary kiln with blast furnace dust, comprise the step that rotary kiln high temperature fuming process feed stock for blast furnace produces Second-rate zinc oxide powder, it is characterized in that through the following step:
A, by following masses % for raw material:
Lime is added to SiO in compound
2: CaO=2: 1
Blast furnace dust 50%
Sedimentation powder 40%
Back powder surplus;
Described sedimentation powder is the dust reclaimed from the fly-ash separator conventional stove production line;
Described back powder is the dust reclaimed from the surface cooler conventional stove production line;
B, fully mixed by the standby raw material of steps A institute, controlling mixture moisture content is 16% mass ratio;
C, the compound of step B is made pelletizing routinely, stove pellet feed must be entered;
D, the stove pellet feed that enters of step C to be sent in rotary kiln, under following reduction volatilization condition: temperature is 1150 DEG C, rotating speed is 1 turn/2 minutes, roasting 2 hours, valuable metal Zn, Pd, Cd, In, Bi volatilization enters in gas phase, by reclaiming surface cooler, bagroom, obtaining Second-rate zinc oxide powder, obtaining the kiln slag of the rotary kiln by-product that can again utilize simultaneously.
2. be the method that Second-rate zinc oxide powder produced by raw material rotary kiln with blast furnace dust, comprise the step that rotary kiln high temperature fuming process feed stock for blast furnace produces Second-rate zinc oxide powder, it is characterized in that through the following step:
A, by following masses % for raw material:
Lime is added to SiO in compound
2: CaO=2: 1
Blast furnace dust 60%
Sedimentation powder 20%
Back powder surplus;
Described sedimentation powder is the dust reclaimed from the fly-ash separator conventional stove production line;
Described back powder is the dust reclaimed from the surface cooler conventional stove production line;
B, fully mixed by the standby raw material of steps A institute, controlling mixture moisture content is 22% mass ratio;
C, the compound of step B is made pelletizing routinely, stove pellet feed must be entered;
D, the stove pellet feed that enters of step C to be sent in rotary kiln, under following reduction volatilization condition: temperature is 1250 DEG C, rotating speed is 1 turn/2 minutes, roasting 2 hours, valuable metal Zn, Pd, Cd, In, Bi volatilization enters in gas phase, by reclaiming surface cooler, bagroom, obtaining Second-rate zinc oxide powder, obtaining the kiln slag of the rotary kiln by-product that can again utilize simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310490196.2A CN103555966B (en) | 2013-10-18 | 2013-10-18 | Method for producing zinc hypoxide powder in rotary kiln by taking blast furnace smoke as raw material |
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| CN201310490196.2A CN103555966B (en) | 2013-10-18 | 2013-10-18 | Method for producing zinc hypoxide powder in rotary kiln by taking blast furnace smoke as raw material |
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| CN103555966B true CN103555966B (en) | 2015-07-01 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087947B (en) * | 2015-09-16 | 2018-01-12 | 武汉钢铁有限公司 | The method that zinc is extracted from blast furnace gas mud |
| CN106148728B (en) * | 2016-07-05 | 2019-06-07 | 湖南博一环保科技有限公司 | A method of a variety of hazardous wastes containing zinc are disposed simultaneously using rotary kiln device |
| CN108085511A (en) * | 2017-11-28 | 2018-05-29 | 酒泉钢铁(集团)有限责任公司 | A kind of method that zinc kiln slag production metallized charge is carried using blast furnace dust |
| CN111893295A (en) * | 2020-08-12 | 2020-11-06 | 鑫联环保科技股份有限公司 | Enrichment recovery method for zinc-containing secondary resource volatilization kiln |
| CN113122727A (en) * | 2021-04-22 | 2021-07-16 | 鑫联环保科技股份有限公司 | Method for treating iron and steel smoke dust |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101078053A (en) * | 2007-06-23 | 2007-11-28 | 王树楷 | Method for extracting metal indium, zinc and bismuth from blast furnace gas ash |
| CN101191159A (en) * | 2007-11-27 | 2008-06-04 | 攀钢集团钢城企业总公司 | Technique for extracting zinc from blast furnace gas mud by using rotary kiln |
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- 2013-10-18 CN CN201310490196.2A patent/CN103555966B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101078053A (en) * | 2007-06-23 | 2007-11-28 | 王树楷 | Method for extracting metal indium, zinc and bismuth from blast furnace gas ash |
| CN101191159A (en) * | 2007-11-27 | 2008-06-04 | 攀钢集团钢城企业总公司 | Technique for extracting zinc from blast furnace gas mud by using rotary kiln |
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