CN102618718B - Method for preparing high strength green pellets from steel plant iron-containing dust - Google Patents
Method for preparing high strength green pellets from steel plant iron-containing dust Download PDFInfo
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- CN102618718B CN102618718B CN2012100150851A CN201210015085A CN102618718B CN 102618718 B CN102618718 B CN 102618718B CN 2012100150851 A CN2012100150851 A CN 2012100150851A CN 201210015085 A CN201210015085 A CN 201210015085A CN 102618718 B CN102618718 B CN 102618718B
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Abstract
The present invention relates to a method for preparing high strength green pellets from steel plant iron-containing dust. The method comprises the following steps: taking sludge, dry dust, sulfuric acid residue, dry coal fines, and quick lime to prepare the materials; uniformly stirring the sludge, mixing the sludge with the dry dust, the sulfuric acid residue, the dry coal fines, and the quick lime, stirring and uniformly dispersing, and carrying out piling-ripening for 8-24 hours to obtain a mixed clinker; and carrying out damp milling and balling on the mixed clinker. The method of the present invention has the following advantages that: the process is simple, the production cost is low, and the technical indicators are advanced. The prepared green pellets have characteristics of water content of 10-15%, falling strength of 4-8 times/0.5 m, compressive strength of 10-15 Newton/per pellet, and granularity of 5-16 mm, and provide high-quality raw materials for the subsequent successful metal pellets sintered roasting dezincification. In addition, the method is suitable for industrial application.
Description
Technical field:
The invention discloses the method that a kind of steel mill iron dust containing prepares the high strength green-ball; Belong to technical field of ferrous metallurgy.
Background technology
Iron dust containing is the accessory substance that produces in Steel Plant's ironmaking and the steelmaking process, mainly from sintering, blast furnace ironmaking and converter steelmaking dedusting and coking furnace sewage disposal, the main valuable element such as iron content and charcoal, in addition, harmful elements such as leaded, zinc, arsenic also, wherein zinc has certain recycling and is worth.In addition, sulfate slag also is a kind of important iron content secondary resource.Therefore, such dust and slag have important comprehensive utilization value for iron and steel enterprise, but directly reclaim to use and easily cause again the enrichment of harmful element in blast furnace, affect the steady running of main production line, even cause a serious accident, simultaneously arsenic is owing to being difficult to remove in smelting process, is unfavorable for smelting fine steel grade after entering molten iron, thereby can't recycles these reclaimed materials.Adopt pelletizing metallization sintering process can the effective elimination starting material in the harmful elements such as zinc, arsenic; Prerequisite is at first pelletizing of the compound that forms of such dust and sulfate slag, guarantees that the bed of material has good ventilation property in process is baked with agglomeration in the pelletizing metallization.But the size composition of such dust, sulfate slag and coking furnace mud, moisture and surface hydrophilic gender gap are very large, and balling-up is poor, the pelletizing difficulty.Therefore, limited the regeneration of such dust, sulfate slag and coking furnace mud etc.
Summary of the invention
The object of the invention is to overcome the deficiency of prior art and but the iron dust containing balling-up of simple, the easy to operate Effective Raise of a kind of processing method steel mill is provided, steel mill's iron dust containing that the quality of green pellets of manufacturing is good prepares the method for high strength green-ball.
Steel mill of the present invention iron dust containing prepares the method for high strength green-ball, comprises the steps:
The first step: batching
Get respectively by mass percentage mud (pressing the butt weighing scale), 20-25% dry type dust, the sulfate slag of 10-20%, 10%-25% dry pulverized coal, the 5%-10% unslaked lime of 20%-35%; Described mud moisture (the quality percentage composition of water in the mud) 30%-40%;
Second step: batch mixing
Sludge agitation evenly mixed with dry type dust, sulfate slag, dry pulverized coal, unslaked lime also dispersed with stirring is even, stored up slaking 8-24 hour; Obtain mixing grog;
The 3rd step: pelletizing
To mix grog profit mill and pelletizing.
Steel mill of the present invention iron dust containing prepares in the method for high strength green-ball, and described mud is at least a in converter mud, blast furnace gas mud, the coke oven mud.
Steel mill of the present invention iron dust containing prepares in the method for high strength green-ball, and described dry type dust is at least a in sintering plant electro-precipitating dust and the blast furnace dust.
Steel mill of the present invention iron dust containing prepares in the method for high strength green-ball, and described mud adopts to stir and blocks mixing machine and stir; Described mud mixes with siccatives such as dry type dust, sulfate slag, dry pulverized coal, unslaked limes and adopts the stirrer dispersed with stirring even.
Steel mill of the present invention iron dust containing prepares in the method for high strength green-ball, and described mixing grog adopts damp mill to moisten mill, profit grind materials moisture (the quality percentage composition of water in the profit grind materials) 7-9%, profit time consuming 2-5min.
Steel mill of the present invention iron dust containing prepares in the method for high strength green-ball, pelletizing time 10-15min, green-ball moisture (the quality percentage composition of water in the green-ball) 10-15%.
The present invention is owing to adopting above-mentioned processing method, very large for such dry dust, dried sulfate slag, dry pulverized coal and mud size composition, moisture and surface hydrophilic gender gap, balling-up is poor, the pelletizing hard problem, the compound that before pelletizing such raw material is consisted of carries out from dehydration and the pre-treatment of thermochemistry effect strengthen dewatering, then carry out surperficial mechanical activation treatment, improve its balling-up, strengthen pelletizing.To guarantee when adopting the pelletizing metallization to bake with agglomeration dezincify, in process is baked with agglomeration in the pelletizing metallization, the pelletizing bed of material has good ventilation property, strengthen reduction of ferrous oxide and reduction volatilization dezincify dearsenification, improve pellet agglomerate output and quality, for blast furnace ironmaking provides the high-quality furnace charge, comprehensively reclaim the valuable elements such as zinc.
The converter steeling sludge that water content is too high, blast furnace gas mud class ion dust mud contaning, coking furnace mud (containing charcoal dirt mud), transportation and use difficulty often adopt filter press technique to dewater, filtration difficulty, the filter cake moisture fluctuation is large, and filter cleans difficulty, and production cost is high.But the dry dust of steel mill, coal dust and the sulfate slag porosity is high, surface hydrophilicity is poor often need to need to add in advance water before pelletizing, carry out long-time wetting to improve balling-up.The present invention utilizes dry dust, dry pulverized coal and the high characteristics of sulfate slag porosity, in the compound that wet type dirt mud directly adds the poor dry dust of wetting ability, does the reduction coal dust, dried sulfate slag and unslaked lime consist of, utilize porous dry material strong absorptive, quicklime slaking suction and exothermic effect thereof, carry out the dewatering tank by heating of compound, dehydration and in advance wetting combination of dry material with wet stock, greatly improve dewatering efficiency, improve dispersiveness and the material surface hydrophilicity of compound, save production cost.Then compound is moistened mill and Forced Dispersion, the dish pelletizer carries out pelletizing in the garden, can prepare the high-quality green-ball.
The reinforcement pellet forming process that the present invention adopts stirs various mud stirring to block in the mixing machine, is sprayed onto the surface of various dry mixs, disperses and mixing by mixing machine, and the mixing material is carried out 8-24 hour storing up and maturation process.Mixing material after the slaking enters damp mill again and moistens mill, further mixes, Forced Dispersion, grinding and reduce moisture, improves surfactivity.Material feeds pelletizer and carries out pelletizing and screening behind the profit mill, can prepare the qualified green-ball of high-quality (granularity 5-16mm), returns profit grinder order less than 5mm with greater than the green-ball of 16mm.Wherein key is to utilize porous dry material strong absorptive, quicklime slaking suction and exothermic effect thereof, carry out the dewatering tank by heating of compound, dehydration and in advance wetting combination of dry material with wet stock, greatly improve dewatering efficiency, improve dispersiveness and the material surface hydrophilicity of compound, save production cost.
Advantage of the present invention and positively effect:
Technical process of the present invention is simple, production cost is low, technical indicator is advanced, the green-ball moisture 10%-15% for preparing, 4 times/0.5m-8 time/0.5m of shatter strength of green pellet, compression strength of green pellet 10Newton/-15Newton/ is individual, green-ball granularity 5mm-16mm is for the dezincify of baking with agglomeration of follow-up successful metallized pellet provides high quality raw material.Be suitable for industrial applications.
Description of drawings
Accompanying drawing 1 is process flow sheet of the present invention.
Embodiment
Embodiment 1:
Proportioning raw materials (pressing the butt weighing scale): converter mud 20%, gas mud 5%, coking furnace mud 10%, dry type dust 15%, gas ash 10%, sulfate slag 20%, unslaked lime 10%, coal dust 10%.Compound is undertaken three times by flow process to be mixed, store up slaking after 8 hours, add damp mill and moisten mill, profit grind materials moisture 8%, profit time consuming 3min, pelletizing time 12min, pelletizing moisture 15%, prepare the high-quality green-ball: green-ball moisture 13.3%, 4.2 times/0.5m of shatter strength of green pellet, compression strength of green pellet 11.0Newton/, green-ball granularity 5-16mm.
Embodiment 2:
Proportioning raw materials (pressing the butt weighing scale): converter mud 25%, gas mud 5%, dry type dust 8%, gas ash 17%, sulfate slag 20%, unslaked lime 10%, coal dust 15%.Compound is undertaken three times by flow process to be mixed, store up slaking after 8 hours, add damp mill and moisten mill, profit grind materials moisture 7.3%, profit time consuming 3min, pelletizing time 12min, pelletizing moisture 15%, prepare the high-quality green-ball: green-ball moisture 12.3%, 4.2 times/0.5m of shatter strength of green pellet, compression strength of green pellet 11.0Newton/, green-ball granularity 5-16mm.
Embodiment 3:
Proportioning raw materials (pressing the butt weighing scale): converter mud 20%, gas mud 5%, dry type dust 10%, gas ash 15%, sulfate slag 25%, unslaked lime 10%, coal dust 15%.Compound is undertaken three times by flow process to be mixed, store up slaking after 8 hours, add damp mill and moisten mill, profit grind materials moisture 8.8%, profit time consuming 3min, pelletizing time 12min, pelletizing moisture 14%, prepare the high-quality green-ball: green-ball moisture 15.3%, 6.3 times/0.5m of shatter strength of green pellet, compression strength of green pellet 12.0Newton/, green-ball granularity 5-16mm.
Embodiment 4:
Proportioning raw materials (pressing the butt weighing scale): converter mud 15%, gas mud 5%, dry type dust 10%, gas ash 15%, sulfate slag 20%, unslaked lime 10%, coal dust 25%.Compound is undertaken three times by flow process to be mixed, store up slaking after 8 hours, add damp mill and moisten mill, profit grind materials moisture 7.5%, profit time consuming 3min, pelletizing time 12min, pelletizing moisture 14%, prepare the high-quality green-ball: green-ball moisture 12.8%, 5.5 times/0.5m of shatter strength of green pellet, compression strength of green pellet 15.0Newton/, green-ball granularity 5-16mm.
Embodiment 5:
Proportioning raw materials (pressing the butt weighing scale): converter mud 25%, gas mud 5%, coking furnace mud 5%, dry type dust 15%, gas ash 10%, sulfate slag 25%, unslaked lime 5%, coal dust 10%.Compound is undertaken three times by flow process to be mixed, store up slaking after 24 hours, add damp mill and moisten mill, profit grind materials moisture 7.9%, profit time consuming 3min, pelletizing time 15min, pelletizing moisture 15%, prepare the high-quality green-ball: green-ball moisture 14.8%, 7.9 times/0.5m of shatter strength of green pellet, compression strength of green pellet 12.1Newton/, green-ball granularity 5-16mm.
Embodiment 6:
Proportioning raw materials (pressing the butt weighing scale): converter mud 25%, gas mud 5%, coking furnace mud 5%, dry type dust 10%, gas ash 10%, sulfate slag 25%, unslaked lime 10%, coal dust 10%.Compound is undertaken three times by flow process to be mixed, store up slaking after 12 hours, add damp mill and moisten mill, profit grind materials moisture 7.9%, profit time consuming 3min, pelletizing time 15min, pelletizing moisture 15%, prepare the high-quality green-ball: green-ball moisture 14.2%, 6.6 times/0.5m of shatter strength of green pellet, compression strength of green pellet 13.3Newton/, green-ball granularity 5-16mm.
Claims (4)
1. steel mill's iron dust containing prepares the method for high strength green-ball, comprises the steps:
The first step: batching
Get respectively by mass percentage mud, 20-25% dry type dust, the sulfate slag of 10-20%, 10%-25% dry pulverized coal, 5%-10% unslaked lime by butt weighing scale 20%-35%; The moisture 30%-40% of described mud; Described mud is at least a in converter mud, blast furnace gas mud, the coke oven mud; Described dry type dust is at least a in sintering plant electro-precipitating dust and the blast furnace dust;
Second step: batch mixing
Sludge agitation evenly mixed with dry type dust, sulfate slag, dry pulverized coal, unslaked lime also dispersed with stirring is even, stored up slaking 8-24 hour; Obtain mixing grog;
The 3rd step: pelletizing
To mix grog profit mill and pelletizing.
2. steel mill according to claim 1 iron dust containing prepares the method for high strength green-ball, it is characterized in that: described mud adopts to stir and blocks mixing machine and stir; Described mud mixes with dry type dust, sulfate slag, dry pulverized coal, unslaked lime siccative and adopts the stirrer dispersed with stirring even.
3. steel mill according to claim 2 iron dust containing prepares the method for high strength green-ball, it is characterized in that: described mixing grog adopts damp mill to moisten mill, profit grind materials moisture 7-9%, profit time consuming 2-5min.
4. the described steel mill of any one iron dust containing prepares the method for high strength green-ball according to claim 1-3, it is characterized in that: pelletizing time 10-15min, green-ball moisture 10-15%.
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| CN2012100150851A CN102618718B (en) | 2012-01-18 | 2012-01-18 | Method for preparing high strength green pellets from steel plant iron-containing dust |
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| WO2014157949A1 (en) * | 2013-03-26 | 2014-10-02 | 주식회사 포스코 | Method for recycling iron-containing by-products discharged from coal-based ironmaking process, system used therefor, and direct-reduced iron agglomeration system |
| CN103710531B (en) * | 2013-12-20 | 2015-09-09 | 攀钢集团成都钢钒有限公司 | A kind of method improving vanadium titanium sinter mixture temperature |
| CN104341087A (en) * | 2014-10-30 | 2015-02-11 | 唐山首钢京唐西山焦化有限责任公司 | Method for treating coking biochemical sludge |
| CN106148685A (en) * | 2016-07-28 | 2016-11-23 | 重庆大学 | A kind of municipal sludge and iron-containing waste prepare the method for acid pellet |
| CN110317950B (en) * | 2019-08-05 | 2021-06-08 | 中南大学 | Reduction dezincification method for zinc-containing dust |
| CN110317949B (en) * | 2019-08-05 | 2021-06-08 | 中南大学 | Preparation method of zinc-containing dust pellets |
| CN111118283B (en) * | 2020-01-07 | 2021-10-08 | 云南云铜锌业股份有限公司 | Method for granulating zinc leaching residues, zinc leaching residue material and application thereof |
| CN111733323A (en) * | 2020-07-21 | 2020-10-02 | 张家港宏昌钢板有限公司 | Method for reducing water consumption for pelletizing of iron-containing dust and mud |
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| CN101476032B (en) * | 2009-02-12 | 2011-06-08 | 重庆科绿威科技开发有限公司 | Metallurgy sintering processing method for urban domestic garbage incineration flyash |
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