CN102719665B - Process method for producing slag-forming agent for making steel by utilizing steel making sludge - Google Patents
Process method for producing slag-forming agent for making steel by utilizing steel making sludge Download PDFInfo
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- CN102719665B CN102719665B CN2012102255684A CN201210225568A CN102719665B CN 102719665 B CN102719665 B CN 102719665B CN 2012102255684 A CN2012102255684 A CN 2012102255684A CN 201210225568 A CN201210225568 A CN 201210225568A CN 102719665 B CN102719665 B CN 102719665B
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Abstract
The invention discloses a process method for producing a slag-forming agent for making steel by utilizing steel making sludge. The process method comprises the following steps of: conveying the steel making sludge to a rotary-drum drying machine to carry out drying to form a dry sludge material; carrying out coextrusion on the dry sludge material and adhesive bentonite by the weight ratio of 1:0.03 to form green balls; conveying the green balls into a medium-temperature shaft furnace for roasting to obtain finished ripe sludge balls; and adding the ripe sludge balls into into a converter in asteel making workshop by twice as the slag forming agent and a cooling agent for steel making of the converter. The production process disclosed by the invention has the advantages that the process problems of sludge drying, discontinuous production, secondary environmental pollution, high production cost, high water content and high sulfur content and the like are effectively solved, the production equipment is simple, the assembly is convenient, and the production process is simple. The invention is suitable for various-scale production and implementation.
Description
Technical field
The invention belongs to the recycling field of iron and steel metallurgy enterprise dedusting dirt mud, relate to a kind of processing method of utilizing steel-smelting sewage sludge production steel-making to use slag former, particularly utilize mud produced by wet dust removal of converter, the production technique of production converter steelmaking slag former and refrigerant and equipment.
Background technology
Iron and steel enterprise produces a large amount of dust in convertor steelmaking process, become mud after wet dedusting.1 ton of steel of the every refining of iron and steel enterprise's converter steelmaking produces the ion dust mud contaning of 10-30Kg, and it contains full iron more than 50%, is good steelmaking feed.At present, the most of iron and steel enterprises of China do raw materials for sintering with steel making dust slime and use, but bof sludge is used for sintered material and has problems, mainly be moisture height (through behind the filter-press dehydration moisture about 34%), fine size (＜5 μ m account for 70%), viscosity greatly, good utilisation not, can worsen the ventilation property of sintered material, influence the SINTERING PRODUCTION technical indicator, sinter quality is descended.Volatile Elements such as the zinc lead that contains in the dirt mud also can be at the blast furnace circulating enrichment, causes in the blast furnace gas zinc content constantly to raise and in blast furnace top dross, gas line stops up, and influences the direct motion of blast furnace.Simultaneously in the transportation of dirt mud, can cause secondary environmental pollution.Therefore, need the new Technology of exploitation to realize harmless treatment and the recycling of steel-smelting sewage sludge.
Present stage, the most effective recycling was that steel-smelting sewage sludge is produced the steel-making slag former, at present the production technique that adopts steel-smelting sewage sludge to produce steelmaking slag agent mainly contains following several: a kind of technology is to pulverize-to add lime powder and stirring-through high pressure pressure ball mechanism ball-normal temperature airing-transport to converter after mud raw material drying or the airing, the cold ball intensity low (300N) of rolling into a ball admittedly that goes out through this kind explained hereafter, water ratio 〉=6%, be unfavorable for the requirement of converter steelmaking, and the airing of group's ball needs bigger airing place, can cause secondary environmental pollution in the airing process; Second kind of technology is similar to first kind, just lime powder is become water glass, moulding is by oven drying at low temperature (below 300 ℃), this kind processing method has solved the problem of group's ball intensity low (800N), and its water ratio 〉=1%, do not need the airing place, but the production cost of this production technique is not suitable for small-scale steelworks and uses than the first method height; The third method is to add bentonite in mud in proportion, ball processed is by 1000 degree high-temperature roastings, the sludge ball intensity height of this kind explained hereafter, water ratio is low, but high temperature vertical kiln laid down cost height, and because sludge ball particle big (diameter 40mm) is difficult for grilling thoroughly, bonding had been melted in the outside when grilled thoroughly inside, shaft furnace is scrapped the bad grasp of technological temperature when serious.
More than several processing methodes have following defective jointly: one, wet mud adopts the method for airing, and production efficiency is low, the place takies greatly, cause secondary environmental pollution; Two, all adopt the forced action type mixing and blending machine can only be interrupted material loading and be interrupted discharging, can not produce continuously, the low output of plant factor is little, can not satisfy the needs that large-scale steel-making enterprise sludge treatment is utilized; The mud group ball water ratio height 〉=1%(converter steelmaking of three, producing requires moisture≤1%); Four, sulfur-bearing height (sulphur content is between the 0.113-0.18%) does not have the technological process of desulfurization, and converter steelmaking requires sulfur content of raw material≤0.045%, can not satisfy the requirement of steel-making.
Summary of the invention
The present invention is in order to solve the deficiency of existing technology of steel-smelting sewage sludge being made slag former and products thereof, a kind of patent steel-making wet dedusting mud coldmoulding group ball, production technique of warm shaft furnace baked for producing converter steelmaking usefulness slag former in the warp again utilized to be provided.
Realize above-mentioned purpose by the following technical solutions: a kind of processing method of utilizing steel-smelting sewage sludge production steel-making to use slag former, it carries out according to following steps:
A, steel-smelting sewage sludge is delivered to rotary drum drying machine dry, to being dried into the dewatered sludge raw material that water ratio is 15%-18%;
B, the dewatered sludge raw material being mixed with the weight ratio of 1:0.03 with the caking agent bentonite, stirred by horizontal-type biaxial rneader earlier, is green-ball by the extrusion molding of high pressure ball press after bipolar crusher carries out fragmentation again;
Warm shaft furnace carried out roasting during c, green-ball were admitted to, and maturing temperature is 500-700 ℃, and roasting time is no more than 30 minutes, made finished product ripe sludge ball;
D, ripe sludge ball join converter interior slag former and the refrigerant as converter steelmaking of steelshop at twice; Add opening to blow in the 2min for the first time, add-on control 10-15Kg t; Repeatedly add on a small quantity when the second time is neat on fire door charcoal fire, add-on is controlled at 15-20Kg t in batches.
The described applied equipment of processing method that utilizes steel-smelting sewage sludge production steel-making to use slag former of a kind of claim 1, discharge port for the wet sludge bin that holds wet mud is connected with the feeding mouth of screw feeder, the discharge port of screw feeder places the feeding end inside of cylinder dryer, the discharge port of cylinder dryer is connected with the dewatered sludge storehouse through conveying belt, the discharge port in dewatered sludge storehouse links to each other with disk feeder, and the outlet of disk feeder links to each other with first endless belt conveyor of quantitative conveying; The outlet of additive bin links to each other with the entrance of quantitative screw feeder, and quantitatively screw feeder links to each other with first endless belt conveyor; First endless belt conveyor is connected with horizontal-type biaxial rneader, the outlet of horizontal-type biaxial rneader links to each other with bipolar crusher through chute, the outlet of bipolar crusher is slipped through chute and is linked to each other with second endless belt conveyor, second endless belt conveyor is connected with the sub-material chute, the sub-material chute links to each other with ball press respectively, ball press links to each other with first chapelet respectively through chute, first chapelet links to each other with the green-ball storehouse on middle temperature shaft furnace kiln top, discharge machine and belt chain mat machine at the bottom of the kiln are oppositely arranged, the belt chain mat machine links to each other with second chapelet through chute, second chapelet links to each other with ripe ball warehouse, and ripe ball warehouse bottom is provided with discharge valve 25; Warm shaft furnace is equipped with wet cleaner in described.
Technological problemses such as a kind of production technique disclosed in this invention effectively overcome the mud airing, producing can not be continuously, secondary environmental pollution, production cost height, water ratio height, sulphur content height, production unit is simple, easy to assembly, and production technique is simple, is fit to various scale production and implements.
Description of drawings
Fig. 1 is process flow sheet of the present invention.
Fig. 2 is each device distribution synoptic diagram of the present invention.
Embodiment
Below the present invention will be further described.
This processing method of utilizing steel-smelting sewage sludge production steel-making to use slag former disclosed in this invention, carry out according to following steps:
It is about 34% that the water ratio of the mud of wet dedusting generation is adopted in a, general converter steelmaking, steel-smelting sewage sludge is delivered to rotary drum drying machine dry, to being dried into the dewatered sludge raw material that water ratio is 15%-18%; The cylinder dryer adopts reverse-flow cylinder dryer, does not need induced draft fan and dust-removal system, simplified apparatus;
B, the dewatered sludge raw material being mixed with the weight ratio of 1:0.03 with the caking agent bentonite, stirred by horizontal-type biaxial rneader earlier, is green-ball by the extrusion molding of high pressure ball press after bipolar crusher carries out fragmentation again; Bipolar crusher is special-purpose quartering hammer, can reduce sizing;
Warm shaft furnace carried out roasting during c, green-ball were admitted to, and maturing temperature is 500-700 ℃, and roasting time is no more than 30 minutes, increased intensity and the desulfurization of group's ball in the roasting process, made finished product ripe sludge ball;
D, ripe sludge ball join converter interior slag former and the refrigerant as converter steelmaking of steelshop at twice; Add opening to blow in the 2min for the first time, add-on control 10-15Kg t; Repeatedly add on a small quantity when the second time is neat on fire door charcoal fire, add-on is controlled at 15-20Kg t in batches.Can reach the purpose of high-efficient energy-saving environment friendly like this, realize that the resource utilization of the wet mud partial circulating of steel-making is efficiently utilized the purpose of instead of dedicated slag former, lump ore or agglomerate.
As preferred version: in the production process of slag former, the wet mud of 34% water ratio that sludge sump is gathered is grabbed in the sludge bin 2 that wets with grab bucket 1 earlier, the discharge port of wet sludge bin 2 is connected with the feeding mouth of screw feeder 3, the discharge port of screw feeder 3 places the feeding end inside of cylinder dryer 4, wet steel-smelting sewage sludge is dried into the dewatered sludge raw material in the cylinder dryer, the discharge port of cylinder dryer 4 is connected with dewatered sludge storehouse 6 through conveying belt 5, the discharge port in dewatered sludge storehouse 6 links to each other with disk feeder 7, and the outlet of disk feeder 7 links to each other with first endless belt conveyor 8 of quantitative conveying; The outlet of additive bin 10 links to each other with the entrance of quantitative screw feeder 11, and quantitatively screw feeder 11 links to each other with first endless belt conveyor 8, and dewatered sludge raw material and caking agent bentonite are delivered to horizontal-type biaxial rneader 9 by endless belt conveyor 8; First endless belt conveyor 8 is connected with horizontal-type biaxial rneader 9, the outlet of horizontal-type biaxial rneader 9 links to each other with bipolar crusher 12 through chute, the outlet of bipolar crusher 12 is slipped through chute and is linked to each other with second endless belt conveyor 13, the powder that stirs evenly through pulverizing slips to endless belt conveyor 13 by outlet through chute, second endless belt conveyor 13 is connected with sub-material chute 14, sub-material chute 14 links to each other with two ball presses 15 respectively, ball press 15 links to each other with first chapelet 17 respectively through separately chute 16 respectively, first chapelet 17 links to each other with the green-ball storehouse 18 on middle temperature shaft furnace 19 kilns top respectively, the ripe ball of warm shaft furnace 19 roasting finished products in the warp, discharge machine 20 at the bottom of the kiln is oppositely arranged with belt chain mat machine 21, belt chain mat machine 21 links to each other with second chapelet 23 through chute 22, second chapelet 23 links to each other with ripe ball warehouse 24, ripe ball warehouse 24 bottoms are provided with discharge valve 25, and the finished product sludge ball transports steelshop to through discharge valve 25 entruckings.In warm shaft furnace 19 wet cleaner is equipped with, the mud that shaft furnace produces is recycled through being sent between sludge dewatering by sludge pump behind the wet cleaner.In the generative process, how many delivery rates of disk feeder is determined according to turnout.
Production practice through certain steel mill, the process throughput that employing the present invention produces a ball is big, and production technique is simple, and equipment is simple, and production cost is low, no second environmental pollution, product physical and chemical index advantages of higher.The every index of finished product of producing meets the requirement of steelworks patent steelmaking feed, be good slag former and refrigerant, the import substitution ore uses as slag former fully, shortens the steel-making time, realized the utilization of ferrite partial circulating, reached the wet sewage sludge harmlessness of beam guiding principle and handled and recycling.
Claims (1)
1. one kind is utilized steel-smelting sewage sludge production steel-making with the processing method of slag former, and it carries out according to following steps:
A, steel-smelting sewage sludge is delivered to rotary drum drying machine dry, to being dried into the dewatered sludge raw material that water ratio is 15%-18%;
B, the dewatered sludge raw material being mixed with the weight ratio of 1:0.03 with the caking agent bentonite, stirred by horizontal-type biaxial rneader earlier, is green-ball by the extrusion molding of high pressure ball press after bipolar crusher carries out fragmentation again;
Warm shaft furnace carried out roasting during c, green-ball were admitted to, and maturing temperature is 500-700 ℃, and roasting time is no more than 30 minutes, made finished product ripe sludge ball;
D, ripe sludge ball join converter interior slag former and the refrigerant as converter steelmaking of steelshop at twice; Add opening to blow in the 2min for the first time, add-on is controlled at 10-15kg/t; Repeatedly add on a small quantity when the second time is neat on fire door charcoal fire, add-on is controlled at 15-20kg/t in batches;
It is characterized in that: the discharge port for the wet sludge bin that holds wet mud in the above-mentioned processing method is connected with the feeding mouth of screw feeder, the discharge port of screw feeder places the feeding end inside of cylinder dryer, the discharge port of cylinder dryer is connected with the dewatered sludge storehouse through conveying belt, the discharge port in dewatered sludge storehouse links to each other with disk feeder, and the outlet of disk feeder links to each other with first endless belt conveyor of quantitative conveying; The outlet of additive bin links to each other with the entrance of quantitative screw feeder, and quantitatively screw feeder links to each other with first endless belt conveyor; First endless belt conveyor is connected with horizontal-type biaxial rneader, the outlet of horizontal-type biaxial rneader links to each other with bipolar crusher through chute, the outlet of bipolar crusher links to each other with second endless belt conveyor through chute, second endless belt conveyor is connected with the sub-material chute, the sub-material chute links to each other with ball press respectively, ball press links to each other with first chapelet respectively through chute, first chapelet links to each other with the green-ball storehouse on middle temperature shaft furnace kiln top, discharge machine and belt chain mat machine at the bottom of the kiln are oppositely arranged, the belt chain mat machine links to each other with second chapelet through chute, second chapelet links to each other with ripe ball warehouse, and ripe ball warehouse bottom is provided with discharge valve; Warm shaft furnace is equipped with wet cleaner in described.
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| CN2012102255684A CN102719665B (en) | 2012-07-03 | 2012-07-03 | Process method for producing slag-forming agent for making steel by utilizing steel making sludge |
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| CN2012102255684A CN102719665B (en) | 2012-07-03 | 2012-07-03 | Process method for producing slag-forming agent for making steel by utilizing steel making sludge |
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| CN102719665B true CN102719665B (en) | 2013-09-25 |
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| CN104630462B (en) * | 2015-02-28 | 2017-05-03 | 北京辰兴旭光环保技术有限公司 | Steelmaking sludge drying ball pressing system and ball pressing method |
| CN108642228A (en) * | 2018-05-07 | 2018-10-12 | 中冶宝钢技术服务有限公司 | A kind of method of lime stone mud cake back mixing steel Commercial cultivation |
| CN113416815A (en) * | 2021-06-18 | 2021-09-21 | 江苏润美新材料有限公司 | Synthetic slag for aluminum killed steel direct slag-feeding washing desulfurization process and production process and equipment thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202626235U (en) * | 2012-07-03 | 2012-12-26 | 唐山东方建工集团有限公司 | Equipment for producing steel-making slag former by virtue of steel-making sludge |
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| CN202626235U (en) * | 2012-07-03 | 2012-12-26 | 唐山东方建工集团有限公司 | Equipment for producing steel-making slag former by virtue of steel-making sludge |
Non-Patent Citations (2)
| Title |
|---|
| "转炉污泥循环利用途径";刁军等;《冶金环境保护》;20071231(第5期);第39、61页 * |
| 刁军等."转炉污泥循环利用途径".《冶金环境保护》.2007,(第5期),第39、61页. |
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