CN103100546A - Stainless steel slag dry and wet combination treatment process - Google Patents
Stainless steel slag dry and wet combination treatment process Download PDFInfo
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- CN103100546A CN103100546A CN2011103703132A CN201110370313A CN103100546A CN 103100546 A CN103100546 A CN 103100546A CN 2011103703132 A CN2011103703132 A CN 2011103703132A CN 201110370313 A CN201110370313 A CN 201110370313A CN 103100546 A CN103100546 A CN 103100546A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/20—Waste processing or separation
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Abstract
According to stainless steel slag property, an EAF slag and AOD slag are separately treated, the EAF slag adopts wet type treatment, and the AOD slag adopts dry type treatment. In an EAF slag wet innocent treatment metal recovery process, stainless steel slag is screened and crushed to enter a rod mill for fine crushing, ferrous sulfate solution is quantitatively added so that Cr<+6> is reduced to Cr<+3>, muddy water is separated from steel slag particles containing metals through a spiral classifier, water in the muddy water is removed, and the steel slag particles containing metals are separated in a jigger so as to separate out magnetic oxidized metals through a permanent magnetic separator; and particle metal recovery of steel slag is over 90%, the slag content of the recovered luppen is below 1%, the recovered metal is used for steel making, the slag particles are widely applied to a building field, and economy is good. In an AOD slag dry innocent treatment metal recovery process, bulk steel slag of below 5mm through screening enters a sealed negative-pressure belt conveyer to supply materials for a wind mill, dust is not generated at negative pressure, the steel slag is crushed through a wind separation mill, stainless steel metals are separated out at a mill head, the inlet and outlet of the wind separation mill are at negative pressure, the stainless steel metal gravity is large and is not absorbed by negative pressure wind, the dust is absorbed without pollution, air and dust are separated through an efficient dust remover, the dust is collected through a cloth bag, and the component containing magnetic metals is separated out during the dust conveying process; and particle metal recovery of steel slag is over 90%, the recovered ferric oxide dust volume is below 1%, the specific surface area of the fine dust after dry type treatment of the steel slag is 350 m<2>/kg, and the steel slag can be directly added as a concrete raw material without any processing.
Description
(1) technical field
The present invention relates to the technology of a kind of stainless steel slag metal recovery and comprehensive utilization of resources.
(2) technical background
The character of stainless steel slag is: general stainless steel slag contains the 4-8% metal, contains 1% magnetic oxygenated metal, and recovery value is arranged.Electric furnace (EAF) slag becomes block after meeting water cooling, and the naturally cooling rear efflorescence of converter (AOD) slag is powdered.200 be, 300 be that stainless steel does not have magnetic, 400 is that stainless steel is magnetic.
Stainless steel slag is processed present situation: (1) and straight carbon steel mixed processing, shortcoming is: the straight carbon steel slag is to process with magnetic selection method, but 200 is, 300 to be that stainless steel is nonmagnetic can't reclaim, and reclaims not thorough.(2) electric furnace (EAF) slag and converter (AOD) slag mix the employing wet processed, shortcoming is: pulverous AOD slag major part enters water treatment system need to consume a large amount of water resource increase processing costs, and Water treatment pressure mud cake caught on a filter easily causes secondary pollution without value.
(3) summary of the invention
The present invention separately processes electric furnace (EAF) slag and converter (AOD) slag according to the character of stainless steel slag, and electric furnace (EAF) slag adopts wet processed, and converter (AOD) slag adopts dry process.Advantage of the present invention: metal recovery rate is high, and running cost is low, discharges without any refuse, and all output objects can rationally be utilized.
1 EAF slag wet processed flow process
During broken piece slag, larger metal manual sorting out again as raw material for making steel.After manual sorting's bulk metal and refuse, then slag enters wet rod mill and carries out fine grinding by twice fragmentation.Separate by vibratory sieve through the metallic particles after the wet type rod milling, obtain rod mill and select metal derby.Residue on sieve enters into water treatment system through the spiral classifier partition size less than the 0.2mm slime water, and granularity is greater than being separated into the metallic particles tailings after granule metal slime water enters jigging machine and magnetic separator containing of 0.2mm.
By above processing, can reach following effect:
1. the Fe-Ni rate of recovery 〉=90%, after processing in tailings residual metal less than 1%.
2. the metal recovery thing is for steel-making, and magnetic oxygenated metal is made bulk and again smelted.
3. tailings granularity 0.2～7mm, can be applicable to produce construction material, and the medium and small slime water in 0.2mm of slag powder seldom reduces waters 50% than two kinds of slag mixed processing.
The AOD slag does not advise adopting the reason of wet processed: the AOD slag has the characteristic powdered state of cooling rear natural degradation, if the AOD slag adopts the wet type flow processing, 90%AOD slag particle degree is all less than 0.2mm, all be slurry mud shape and enter depositing reservoir, water treatment, press filtration, drying and processing cost are high, and press filtration mud cake does not out have value, so suggestion AOD slag adopts the processing of dry type.
2 AOD slag dry process flow processs
After fully cooling converter (AOD) slag natural degradation, larger metal sorts out again and uses as steelmaking feed, after manual sorting's bulk metal and other refuse, by loading machine, complete cooling converter (AOD) granulated slag of process is added in hopper, granulated slag enters the pneumatic grinding mill fine grinding through primary fragmentation is laggard, Stainless Steel metal in selection by winnowing mill can not pulverized, and metal sieve from out by bistrique, and in the selection by winnowing mill, out dust is through the high-efficiency dust remover collection.
By above processing, can reach following effect:
1. the Fe-Ni rate of recovery 〉=90%, after processing in tailings residual metal less than 1%.
2. the metal recovery thing is for steel-making, and magnetic oxygenated metal is made bulk and again smelted.
3. after reclaiming, the fine dust specific area can reach 350m
2/ kg processes the raw material that can directly add as cement without any need for processing.
4. the advantage of dry process: the rate of recovery is high, and processing cost is low, saves a large amount of water resources, and reducing affects the rear portion water treatment.
3 the technical solution adopted for the present invention to solve the technical problems are
1. the processing of 6 valency chromium in stainless steel slag wet processed technique: add copperas solution that 6 valency chromium in slag are reduced into 3 valency chromium in waste water.
2. in stainless steel slag dry process technique, dust solves: using the closed negative pressure belt feeder to carry the steel-making slag powder free from dust to reveal and pollute, is negative pressure in pneumatic grinding mill, and dust can be siphoned away the pollution that can not leak outside timely.
4 description of drawings
It is stainless steel slag wet processed process chart in Fig. 1.
in Fig. 1: loading machine is the A101/1 feed bin of packing into through the slag that tentatively smashes, bar screen is established at A101/1 feed bin top, granularity is slid down greater than the slag of 300mm to be needed to reinstall feed bin after fragmentation, bulk metal is also here directly selected, granularity enters feed bin less than the slag of 300mm, carry uniformly upper A103/1 belt conveyor by the A102 oscillating feeder, set up on this belt feeder and manually select the iron platform, fineness ratio larger or the metal that separates of slag iron manually select thus, metal derby is delivered to A103/3pit through the A103/2 belt conveyor and 1. expects the hole, no longer enter subsequent handling.slag is delivered to the A104 jaw crusher through the A103/1 belt conveyor and carries out primary fragmentation to 80mm, then be delivered to the A106 jaw crusher by the A105 belt conveyor and carry out second-time breakage to 30mm, then be delivered to the A108 feed bin through the A107 belt conveyor and carry out intermediate storage, then by the A108/2 oscillating feeder, the A109 belt conveyor, the A110 oscillating feeder is given A111 rod mill feed equably, add a certain proportion of copperas solution in rod mill, reduce 6 valency chromium, slag particle degree after the process rod milling is less than 7mm, after the A112 vibratory sieve, the reguline metal of selecting is transported to pit through the A113 belt conveyor and 2. expects the hole, other granularity is transported to the A115 vibrating-dewatering screen less than the slag of 7mm by the A114 spiral classifier, slag after dehydration enters the A116 bucket elevator slag is transported in the A117 storage bin hopper, be transported to the A119 distribution chute by the A118 oscillating feeder, slag enters A120/1, 2 other dynamic formula jigging machines begin separating metal, the metal of separating separates moisture by the A121 spiral classifier, metal is transported to pit by the A122 belt feeder and 3. expects the hole, jigging machine slag out enters A123 magnetic separator separation of oxygenated metal, the oxidized metal of separating enters the A124 spiral classifier, the A124 spiral classifier is transported to pit to the oxidized metal of separating by the A125 belt feeder and 4. expects the hole, metal-free slag that the A123 magnetic separator is separated enters the A126 spiral classifier, the A126 spiral classifier separates slag and water, slag is transported to pit after the A127 vibrating-dewatering screen dehydration and 5. expects the hole, whole slag wet processed is completed.
It is stainless steel slag dry process process chart in Fig. 2.
In Fig. 2: loading machine is through the slag that tentatively the smashes C101 feed bin of packing into, and bar screen is established at C101 feed bin top, and granularity is slid down feed bin greater than the slag of 100mm, and bulk metal is also here directly selected, and enters the wet type flow processing greater than the slag piece of 100mm.granularity enters feed bin less than the slag of 100mm, carry equably upper C102/2 drag conveyor by the C102/1 oscillating feeder, slag is through C102/2, 3 drag conveyors are delivered to the C103/1 impact breaker and are crushed to below 5mm, then be delivered to the C104/1 bucket elevator by the C103/2 drag conveyor, the C104/2 distribution is delivered in the C105/1 storage bin hopper, then be delivered to the C107/1 pneumatic grinding mill through the C106/1 conveyer in small, broken bits, metal sieves from coming out to 1. stockpile of pit by bistrique, in the selection by winnowing mill, dust is collected by the C108/1 dust removal machine, the C109/1 conveyer carries out magnetic separation, the magnetic granulated metal is to 2. stockpile of pit, after magnetic separation, dust enters the C110/1 bucket elevator and delivers to C111/1 storehouse bucket storage.Line is processed on another road: be that processing is broken rear less than 5mm magnetic steel ground-slag end, magnetic steel ground-slag end is transported in the C105/2 storage bin hopper by the C104/2 distributor, then be delivered to the C107/2 magnetic belt separator through the C106/2 auger conveyor and carry out magnetic separation, the metal of selecting is to 3. stockpile of pit, slag powder after magnetic separation is transported in the bucket of C110/2 storehouse by the C109/2 bucket elevator and stores, and whole slag dry process flow process is completed.
Claims (4)
1. a stainless steel slag (electric furnace) wet type harmless treatment, the technological process of metal recovery, slag is controlled diagrid, control the device of slag granularity, the broken slag of rod mill and elimination 6 valency chromium harm, add ferrous sulfate to eliminate the harm of 6 valency chromium in rod mill, spiral classifier is the equipment that separates thin slag and slime water, the metal-free slime water of energy sub-department, jigging machine is by vibration, screening, collect, intermittent take-offs etc. separate the following stainless steel metal of 7mm, can reclaim the metal of different specific weight fully, permanent magnetic separator is isolated the oxide of magnetic in water, there is no environmental pollution, the spiral grader separates slag and slime water. the slag commodity selling of separating.
2. stainless steel slag harmless treatment according to claim 1 and metal recovery, it is characterized in that: described steel slag particle degree is controlled, rod mill is broken, eliminate 6 valency chromium, spiral classifier separates slag and slime water, jigging machine separates stainless steel metal, permanent magnetic separator separates magnetic oxide, and the spiral grader is to separate slag and slime water.
3. a stainless steel slag (refining furnace) dry type harmless treatment, the technological process of metal recovery, slag is controlled diagrid, control the device of slag granularity, the closed negative pressure belt conveyor is to the pneumatic grinding mill feed, negative pressure just dust can not occur, the selection by winnowing mill is isolated stainless steel metal with steel-making slag powder comminution head sieve, selection by winnowing mill charging aperture and discharging opening are all negative pressure, stainless steel metal is than great, can do not siphoned away by the wind of negative pressure, dust can not siphon away and pollute, high-efficiency dust remover carries out air and dust separation, can collect dust by cloth bag, dust is being separated containing magnetic metallic powder in course of conveying.
4. stainless steel slag harmless treatment according to claim 3 and metal recovery, it is characterized in that: described steel slag particle degree is controlled, the closed negative pressure belt conveyor is to the pneumatic grinding mill feed, after the selection by winnowing mill is pulverized slag, the bistrique sieve is isolated stainless steel metal, high-efficiency dust remover carries out air and dust separation, can collect dust by cloth bag, dust is being separated containing magnetic metallic powder in course of conveying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011103703132A CN103100546A (en) | 2011-11-09 | 2011-11-09 | Stainless steel slag dry and wet combination treatment process |
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| CN2011103703132A CN103100546A (en) | 2011-11-09 | 2011-11-09 | Stainless steel slag dry and wet combination treatment process |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404177A (en) * | 2014-11-13 | 2015-03-11 | 酒钢集团吉瑞再生资源开发有限责任公司 | Stainless steel slag drying and air separation device and drying and air separation method |
| CN104550176A (en) * | 2014-12-29 | 2015-04-29 | 苏州米莫金属科技有限公司 | Metal powder recovering device |
| CN104862490A (en) * | 2015-05-28 | 2015-08-26 | 中冶南方工程技术有限公司 | Method and device for recycling stainless steel slags |
| CN105039612A (en) * | 2015-06-29 | 2015-11-11 | 上海宝钢节能环保技术有限公司 | Method for recycling metallic iron from stainless steel slag |
| GB2529876A (en) * | 2014-09-05 | 2016-03-09 | Darlow Lloyd & Sons Ltd | Reuse of by-products from metallurgical processes |
| CN106824513A (en) * | 2017-03-28 | 2017-06-13 | 响水恒生不锈钢铸造有限公司 | Slag crushing screening plant |
| CN114939591A (en) * | 2021-02-08 | 2022-08-26 | 田玉国 | Dry separation process for stainless steel slag |
-
2011
- 2011-11-09 CN CN2011103703132A patent/CN103100546A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2529876A (en) * | 2014-09-05 | 2016-03-09 | Darlow Lloyd & Sons Ltd | Reuse of by-products from metallurgical processes |
| CN104404177A (en) * | 2014-11-13 | 2015-03-11 | 酒钢集团吉瑞再生资源开发有限责任公司 | Stainless steel slag drying and air separation device and drying and air separation method |
| CN104404177B (en) * | 2014-11-13 | 2017-03-01 | 酒钢集团吉瑞再生资源开发有限责任公司 | Stainless steel slag drying, pneumatic separation device and its drying, wind selection method |
| CN104550176A (en) * | 2014-12-29 | 2015-04-29 | 苏州米莫金属科技有限公司 | Metal powder recovering device |
| CN104862490A (en) * | 2015-05-28 | 2015-08-26 | 中冶南方工程技术有限公司 | Method and device for recycling stainless steel slags |
| CN105039612A (en) * | 2015-06-29 | 2015-11-11 | 上海宝钢节能环保技术有限公司 | Method for recycling metallic iron from stainless steel slag |
| CN105039612B (en) * | 2015-06-29 | 2017-09-15 | 上海宝钢节能环保技术有限公司 | A kind of method that metallic iron is reclaimed from stainless steel slag |
| CN106824513A (en) * | 2017-03-28 | 2017-06-13 | 响水恒生不锈钢铸造有限公司 | Slag crushing screening plant |
| CN114939591A (en) * | 2021-02-08 | 2022-08-26 | 田玉国 | Dry separation process for stainless steel slag |
| CN114939591B (en) * | 2021-02-08 | 2024-01-30 | 田玉国 | Dry separation process for stainless steel slag |
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Application publication date: 20130515 |