CN111285405A - Method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings - Google Patents
Method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 91
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 88
- 239000010959 steel Substances 0.000 title claims abstract description 88
- 238000007885 magnetic separation Methods 0.000 title claims abstract description 70
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 title claims abstract description 45
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 43
- 239000011777 magnesium Substances 0.000 title claims abstract description 43
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 41
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 98
- 229910052742 iron Inorganic materials 0.000 claims abstract description 49
- 239000002245 particle Substances 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000012043 crude product Substances 0.000 claims abstract description 10
- 239000012467 final product Substances 0.000 claims abstract description 3
- 239000000047 product Substances 0.000 claims description 21
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 14
- 239000011707 mineral Substances 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims 1
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 0.000 claims 1
- 239000012141 concentrate Substances 0.000 abstract description 6
- 238000009628 steelmaking Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 5
- 239000010419 fine particle Substances 0.000 abstract 1
- 230000008929 regeneration Effects 0.000 abstract 1
- 238000011069 regeneration method Methods 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 25
- 238000000926 separation method Methods 0.000 description 23
- 239000006148 magnetic separator Substances 0.000 description 7
- 238000000227 grinding Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005191 phase separation Methods 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 238000010494 dissociation reaction Methods 0.000 description 5
- 230000005593 dissociations Effects 0.000 description 5
- 239000000395 magnesium oxide Substances 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 238000009837 dry grinding Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005243 fluidization Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000001238 wet grinding Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Food Science & Technology (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
技术领域technical field
本发明属于再生资源领域，涉及一种从钢渣磁选尾矿中分离铁酸钙和铁酸镁的方法。The invention belongs to the field of renewable resources, and relates to a method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings.
背景技术Background technique
铁酸钙和铁酸镁生产工序复杂，对原料品质的要求高，在化学工业和电子工业中有众多应用。与此同时，我国钢渣堆存量和产量都十分巨大，但综合利用率仅为17％左右。不仅影响钢铁生产，还容易造成周边环境污染。铁酸钙和铁酸镁是钢渣中RO相的重要组成部分，属于惰性组分。从钢渣中精细分离铁酸钙和铁酸镁具有现实的应用价值。The production process of calcium ferrite and magnesium ferrite is complex and requires high quality of raw materials, and has many applications in chemical industry and electronic industry. At the same time, the stock and output of steel slag in my country are huge, but the comprehensive utilization rate is only about 17%. It not only affects steel production, but also easily causes environmental pollution. Calcium ferrite and magnesium ferrite are important components of RO phase in steel slag and are inert components. The fine separation of calcium ferrite and magnesium ferrite from steel slag has practical application value.
中国发明专利CN107721211A公开了一种钢渣中RO相的高效分离回收方法，其中包括以下步骤：步骤1)钢渣破碎；步骤2)电荷加载；步骤3)RO相分选；步骤4)分离回收；本发明以钢渣为处理对象，首先对钢渣进行破碎筛分，粒径小于100目，然后使钢渣微粉通过电荷加载装置，使细粉颗粒带上同性电荷，从而产生相斥静电斥力，实现超分散处理，再鼓风使细粉颗粒在悬浮状态下通过电磁分选器，RO相被分选去除，剩余物料回收利用。Chinese invention patent CN107721211A discloses a high-efficiency separation and recovery method of RO phase in steel slag, which includes the following steps: step 1) steel slag crushing; step 2) charge loading; step 3) RO phase separation; step 4) separation and recovery; The invention takes the steel slag as the treatment object. First, the steel slag is crushed and screened, and the particle size is less than 100 mesh, and then the steel slag micropowder is passed through a charge loading device, so that the fine powder particles are charged with the same sex, thereby generating repulsive electrostatic repulsion, and realizing hyperdispersion treatment. , and then blow air to make the fine powder particles pass through the electromagnetic separator in a suspended state, the RO phase is separated and removed, and the remaining materials are recycled.
中国发明专利CN106755650A公开了钢渣生产高活性钢渣粉和惰性矿物产品的工艺。该工艺包括干法粉磨、气力分选、干法磁选、湿法粉磨、湿法磁选、脱水六个步骤。干法粉磨是将回收渣铁后的尾渣粉磨制成钢渣粉，实现惰性矿物解离；气力分选是用超细选粉机将钢渣粉以粒度分级来实现惰性矿物在粗粉中富集，细粉即为高活性钢渣粉产品；干法磁选是利用惰性矿物磁性将粗粉提纯为粗精矿，粗尾渣返回到干法粉磨；粗精矿经湿法粉磨制成细矿浆；由湿法磁选分选细料浆为湿惰性矿物和湿水泥铁质原料；两种湿料分别经脱水制成惰性矿物产品和水泥铁质原料，水返回到湿法粉磨；该发明将钢渣加工成高活性钢渣粉和高铁品位的惰性矿物产品以及水泥铁质原料。Chinese invention patent CN106755650A discloses a process for producing high-activity steel slag powder and inert mineral products from steel slag. The process includes six steps of dry grinding, pneumatic separation, dry magnetic separation, wet grinding, wet magnetic separation and dehydration. Dry grinding is to grind the tailings after recovering slag iron into steel slag powder to realize the dissociation of inert minerals; pneumatic separation is to use an ultra-fine powder separator to classify the steel slag powder by particle size to realize the inert minerals in the coarse powder. After enrichment, the fine powder is the high-activity steel slag powder product; dry magnetic separation is to use inert mineral magnetism to purify the coarse powder into coarse concentrate, and the coarse tailings are returned to dry grinding; the coarse concentrate is ground by wet grinding into fine ore pulp; the fine slurries are separated into wet inert minerals and wet cement iron raw materials by wet magnetic separation; the two wet materials are dehydrated to make inert mineral products and cement iron raw materials respectively, and the water is returned to wet grinding The invention processes the steel slag into high-activity steel slag powder, high-grade iron-grade inert mineral products and cement-iron raw materials.
中国发明专利CN104888948A公开了一种流态化钢渣微粉专用RO相磁选机，它包括流态化部分和磁选部分，所述流态化部分包括流态化槽、进料斗、出料口、气泵、进气口、抽气口和除尘器。磁选部分包括回转磁盘、外壳体、磁系盘、立轴、轴套、传动部和电机，所述立轴竖向设置，所述立轴下端延伸至分选腔内，在立轴的下端固定一个静止的磁系盘，在磁系盘上镶嵌有磁块形成磁系，轴套套置在立轴下段并通过齿轮传动由电机驱动，其中轴套与立轴之间设有回转组件，并设有不锈钢材质的外壳体。应用该发明后，RO相分选后钢渣微粉中的惰性物含量可由原来的35％左右降低到15％，选别RO相后的钢渣微粉活性指标大幅提高，可满足建材市场对钢渣微粉的质量需求。Chinese invention patent CN104888948A discloses a special RO phase magnetic separator for fluidized steel slag micropowder, which includes a fluidization part and a magnetic separation part, and the fluidization part includes a fluidization tank, a feed hopper, and a discharge port , air pump, air inlet, air outlet and dust collector. The magnetic separation part includes a rotating magnetic disk, an outer casing, a magnetic system disk, a vertical shaft, a shaft sleeve, a transmission part and a motor. The vertical shaft is arranged vertically, and the lower end of the vertical shaft extends into the sorting cavity. The magnetic system disk is inlaid with magnetic blocks to form a magnetic system. The shaft sleeve is sleeved on the lower section of the vertical shaft and is driven by a motor through gear transmission. There is a rotary assembly between the shaft sleeve and the vertical shaft, and a stainless steel shell is provided. body. After applying the invention, the content of inerts in the steel slag micropowder after RO phase separation can be reduced from about 35% to 15%, and the activity index of the steel slag micropowder after RO phase separation is greatly improved, which can meet the quality of the steel slag micropowder in the building materials market. need.
中国发明专利CN109554552A公开了一种炉渣RO相分选系统及工作方法。该发明储料装置下面配合设置有出料装置；出料装置下面配合设置有磁选装置，磁选装置下面分别配合设置有第一出口和第二出口，第一出口对应设置有第一搅拌装置，第二出口配合设置有第一研磨装置，第一研磨装置下面设置有磁选装置、磁选装置下面设置有前侧出口和后侧出口，前侧出口和后侧出口的下面分别设置有压滤装置；压滤装置下面设置有收集装置；第二搅拌装置对应设置有输出装置：该发明能够对炉渣中的RO相进行快速的分选，并在分选之前对炉渣进行烟气处理，提高该分选系统的稳定性，同时也有利于对炉渣进行回收利用。Chinese invention patent CN109554552A discloses a slag RO phase separation system and a working method. The storage device of the invention is equipped with a discharging device; the discharging device is equipped with a magnetic separation device; the magnetic separation device is provided with a first outlet and a second outlet respectively, and the first outlet is correspondingly provided with a first stirring device , the second outlet is equipped with a first grinding device, the first grinding device is provided with a magnetic separation device, the magnetic separation device is provided with a front side outlet and a rear side outlet, and the front side outlet and the rear side outlet are respectively provided with pressure A filter device; a collection device is arranged under the filter press device; an output device is correspondingly arranged on the second stirring device: the invention can quickly sort the RO phase in the slag, and perform flue gas treatment on the slag before the separation, so as to improve the The stability of the sorting system is also beneficial to the recycling of slag.
中国发明专利CN108031539A公布了一种热闷、热泼钢渣加工金属回收工艺，选用电磁吸盘、重落锤、液压翻转筛、液压鄂式破碎机和棒磨机、新型宽带磁选机、宽布料器等组成的钢渣破碎、除铁、预处理和钢渣磁选、除铁预粉磨两个闭路循环工艺技术，实现对由热泼和热闷多种冷却方式得到的钢渣的金属回收工艺。本发明的优点在于：本发明可同时进行热闷钢渣、热泼钢渣的加工和金属回收生产工艺，使生产线产量倍增达到100万吨/年，尾渣的品质满足国产立磨机生产高价值的钢渣微粉要求。Chinese invention patent CN108031539A discloses a hot stuffy, hot-splashing steel slag processing metal recovery process, using electromagnetic chuck, heavy drop hammer, hydraulic tumbling screen, hydraulic jaw crusher and rod mill, new broadband magnetic separator, wide distributor Steel slag crushing, iron removal, pretreatment and steel slag magnetic separation, iron removal and pre-grinding two closed-loop process technologies, which are composed of steel slag crushing, iron removal, and pre-grinding. The advantages of the present invention are: the present invention can simultaneously carry out the processing of hot stuffy steel slag and hot splashed steel slag and the metal recovery production process, so that the output of the production line can be doubled to 1 million tons/year, and the quality of the tailings can meet the requirements of domestic vertical mills to produce high-value products. Steel slag micropowder requirements.
中国发明专利CN109365106A公开了一种不锈钢钢渣干式磁选装置及工艺，属于冶金和矿物工程技术领域，装置包括原料仓、废钢收集装置、破碎筛选装置和磁选装置包括磁选机组、筛分机构和磨料机构，破碎筛选装置包括破碎机构、分离机构和打散机构；工艺包括一次破碎筛分、二次破碎筛分及除铁、物料打散、一次磁选筛分、二次磁选分离。该发明在不锈钢钢渣处理过程中，58～60％的不锈钢钢渣不需进行磨细，处理中不消耗水、不需要设置尾矿库。Chinese invention patent CN109365106A discloses a stainless steel slag dry magnetic separation device and process, belonging to the technical field of metallurgy and mineral engineering. The crushing and screening device includes a crushing mechanism, a separation mechanism and a dispersing mechanism; the process includes primary crushing and screening, secondary crushing and screening and iron removal, material scattering, primary magnetic separation screening, and secondary magnetic separation. In the process of treating the stainless steel slag, 58-60% of the stainless steel slag does not need to be ground, no water is consumed during the treatment, and no tailings pond is required.
中国发明专利CN106694517B公开了一种钢渣磁选粉提纯协同制备钢渣微粉的生产工艺，属于钢渣综合利用技术领域。步骤为：将磁选粉倒入受料斗中，依次经振动给料机、皮带秤和斗式提升机进入烘干选粉工序；在选粉机中与热风逆流换热，然后进入粗破工序或后续粉磨工序；粗破后的物料进入打散分级工序，产生的粗料采用磁选机进行磁选；用蒸汽磨进行粉磨；粉磨工序后的细粉平均粒径≤30微米，然后采用钢渣微粉专用RO相磁选机进行磁选，最后收粉。可在将钢渣磁选粉中的金属资源提纯的同时，将其中的非金属物质进行处理，分离出高活性的钢渣微粉和非活性的钢渣微粉，利于后续分类利用。Chinese invention patent CN106694517B discloses a production process of steel slag magnetic separation powder purification and synergistic preparation of steel slag micropowder, which belongs to the technical field of comprehensive utilization of steel slag. The steps are: pour the magnetic separation powder into the receiving hopper, enter the drying powder separation process through the vibrating feeder, the belt scale and the bucket elevator in turn; exchange heat with the hot air in the powder separator countercurrently, and then enter the coarse crushing process Or the subsequent grinding process; the coarsely crushed material enters the dispersing and grading process, and the generated coarse material is subjected to magnetic separation by a magnetic separator; it is ground by a steam mill; the average particle size of the fine powder after the grinding process is ≤30 microns, Then use the RO phase magnetic separator for steel slag powder to conduct magnetic separation, and finally collect the powder. While purifying the metal resources in the steel slag magnetic separation powder, the non-metallic substances in it can be treated to separate the highly active steel slag fine powder and the inactive steel slag fine powder, which is beneficial to the subsequent classification and utilization.
可见，现有的钢渣RO相分选工艺只能利用磁选分离RO相粗产品，不能进一步从RO相中分离出较高品质的铁酸钙和铁酸镁产品。It can be seen that the existing steel slag RO phase separation process can only use magnetic separation to separate the crude RO phase products, and cannot further separate higher-quality calcium ferrite and magnesium ferrite products from the RO phase.
中国发明专利CN108862402A公开了一种回收钢渣中铁资源的方法，包括有如下步骤：步骤一、对钢渣进行熔融操作，采用可调控的氧化性气体，喷吹至所述钢渣的液面上，将钢渣中FeO进行氧化；步骤二、对反应后的钢渣进行降温操作，待温度稳定后进行保温；步骤三、对保温后的钢渣冷却。经过上述步骤后，最终生成的MgFe2O4尖晶石相与Fe3O4均为本发明中利用的钢渣中主要的含铁物相。通过本发明提供的处理步骤，(1)磁选后钢渣中的铁品位提高，可作为铁矿资源用于钢铁生产；(2)相比于目前常用的钢渣铁资源回收处理方法，该方法提高了钢渣中铁的收得率；(3)降低了后处理的钢渣量，起到了钢渣固废减量化的作用。Chinese invention patent CN108862402A discloses a method for recovering iron resources in steel slag, which includes the following steps: Step 1, carry out melting operation on steel slag, use a controllable oxidizing gas, spray it on the liquid level of the steel slag, and melt the steel slag. The middle FeO is oxidized; the second step is to cool the reacted steel slag, and after the temperature is stabilized, the temperature is maintained; the third step is to cool the heat-insulated steel slag. After the above steps, the finally generated MgFe 2 O 4 spinel phase and Fe 3 O 4 are both the main iron-containing phases in the steel slag used in the present invention. Through the processing steps provided by the present invention, (1) the iron grade in the steel slag after magnetic separation is improved, which can be used as iron ore resources for iron and steel production; (2) compared with the currently commonly used steel slag iron resource recovery and treatment methods, the method improves the The recovery rate of iron in the steel slag is improved; (3) the amount of post-processing steel slag is reduced, which plays a role in reducing the amount of steel slag solid waste.
中国发明专利CN109225614A公开了一种增强钢渣RO相磁性以及钢渣中分离惰性矿物的方法。具体为将某一粒度范围的内的钢渣粉在一定温度和一定气氛下进行磁化焙烧。焙烧后的钢渣RO相质量磁化率可提高3～10倍，大幅度增加了钢渣RO相的磁力选别性。Chinese invention patent CN109225614A discloses a method for enhancing RO phase magnetism of steel slag and separating inert minerals from steel slag. Specifically, the steel slag powder within a certain particle size range is magnetized and roasted under a certain temperature and a certain atmosphere. The mass magnetic susceptibility of RO phase of steel slag after roasting can be increased by 3 to 10 times, which greatly increases the magnetic separation of RO phase of steel slag.
可见，现有的钢渣RO相化学处理-分选工艺只能通过物相转化提高磁选分离效率，不能进一步生产和分离出较高品质的铁酸钙和铁酸镁产品。It can be seen that the existing steel slag RO phase chemical treatment-sorting process can only improve the magnetic separation separation efficiency through phase transformation, and cannot further produce and separate higher-quality calcium ferrite and magnesium ferrite products.
发明内容SUMMARY OF THE INVENTION
本发明提供了一种从钢渣磁选尾矿中分离铁酸钙和铁酸镁的方法。The invention provides a method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings.
一种从钢渣磁选尾矿中分离铁酸钙和铁酸镁的方法，其特征在于：采用锤式、颚式破碎设备将钢渣磁选尾矿破碎，选择性解离出粗粒单质铁；之后在300Gs～1500Gs场强下磁选，分离出上述粗粒单质铁颗粒；再用辊式破碎设备将尾渣细碎，利用硬度差异选择性解离出粗颗粒铁酸钙和铁酸镁；之后在500Gs～3200Gs场强下磁选，分离出铁酸钙和铁酸镁粗产品；最后以震动床涡电流分选机处理铁酸钙和铁酸镁粗产品、提升产品等级。A method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings, characterized in that: using hammer type and jaw crushing equipment to crush steel slag magnetic separation tailings to selectively dissociate coarse-grained elemental iron; After that, magnetic separation is carried out under the field strength of 300Gs～1500Gs to separate the above-mentioned coarse-grained elemental iron particles; the tailings are then finely crushed by roller crushing equipment, and the coarse-grained calcium ferrite and magnesium ferrite are selectively dissociated by the difference in hardness; Under the magnetic separation of 500Gs～3200Gs field strength, the crude calcium ferrite and magnesium ferrite products are separated; finally, the crude calcium ferrite and magnesium ferrite products are processed by a vibrating bed eddy current separator to improve the product grade.
进一步地，原料为含铁20％～30％的钢渣磁选尾矿，而不是钢渣原颗粒。Further, the raw material is steel slag magnetic separation tailings with iron content of 20% to 30%, rather than the original steel slag particles.
进一步地，磁选分离出含铁量>63％的粗粒单质铁粒后，采用高压辊磨机、辊式破碎机对脆性颗粒具有选择性破碎效果的辊式破碎设备将磁选尾渣破碎至0.5mm～3.5mm。Further, after magnetic separation separates coarse-grained elemental iron particles with iron content > 63%, the magnetic separation tailings are crushed by high-pressure roller mills and roller crushers, which have a selective crushing effect on brittle particles. to 0.5mm～3.5mm.
进一步地，采用震动床涡电流分选机处理粗产品，提升铁酸钙和铁酸镁产品等级，最终产品杂质矿物含量<2.5％。Further, a vibrating bed eddy current separator is used to process crude products to improve the product grade of calcium ferrite and magnesium ferrite, and the final product has an impurity mineral content of <2.5%.
进一步地，所述震动床涡电流分选设备的给料槽震动冲程为1.5mm～35mm、冲次60～900。Further, the vibrating stroke of the feeding trough of the vibrating bed eddy current sorting equipment is 1.5mm-35mm, and the stroke times are 60-900.
进一步地，提取铁酸钙和铁酸镁后残余的尾渣用于生产胶凝材料。Further, the residual tailings after the extraction of calcium ferrite and magnesium ferrite are used to produce a cementitious material.
与现有的RO相分离技术相比较，本发明以钢渣特性为依据，采用选择性解离方法分段破碎钢渣，最终利用颗粒导电性和磁性差异借助涡电流分选技术提升铁酸钙和铁酸镁产品等级。在原料、分选原理、分选设备，分选方法和最终产品等方面都有创新，是一种新的、高效分离方法。Compared with the existing RO phase separation technology, the present invention is based on the characteristics of the steel slag, adopts the selective dissociation method to break the steel slag in sections, and finally utilizes the difference in particle conductivity and magnetic properties to improve calcium ferrite and iron by means of the eddy current separation technology. Magnesium Oxide Product Grade. There are innovations in raw materials, sorting principles, sorting equipment, sorting methods and final products. It is a new and efficient separation method.
附图说明Description of drawings
图1从钢渣磁选尾矿中分离铁酸钙和铁酸镁的工艺流程。Figure 1. Process flow for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings.
具体实施方式Detailed ways
以下实例用于说明本发明的实施过程，但不用来限制本发明的使用方法和适用范围。The following examples are used to illustrate the implementation process of the present invention, but are not intended to limit the use method and applicable scope of the present invention.
实例1：Example 1:
湖北省某钢厂综合钢渣磁选尾矿，主要成分(多次测试范围值)为：TFe26.22％～27.61％，CaO 37.10％～38.98％，MgO 7.50％～8.22％，Al2O3 4.23％～5.24％，SiO211.59％～14.20％，SO3 0.16％～0.27％。The comprehensive steel slag magnetic separation tailings of a steel plant in Hubei Province, the main components (the range of multiple tests) are: TFe26.22%～27.61%, CaO 37.10%～38.98%, MgO 7.50%～8.22%, Al 2 O 3 4.23 %～5.24%, SiO 2 11.59%～14.20%, SO 3 0.16%～0.27%.
使用过程：Use process:
(1)选择性解离粗粒单质铁。取原料钢渣磁选尾矿5kg，首先用颚式破碎机将原料钢渣磁选尾矿破碎至9.8mm～11.2mm(多次测量平均值，下同)，选择性解离出粗粒单质铁粒。(1) Selectively dissociate coarse-grained elemental iron. Take 5kg of raw steel slag magnetic separation tailings, first crush the raw steel slag magnetic separation tailings to 9.8mm～11.2mm with a jaw crusher (the average value of multiple measurements, the same below), and selectively dissociate coarse-grained elemental iron particles .
(2)分离粗颗粒单质铁。在795Gs～810Gs(多次测量平均值，下同)场强下采用干式粉体磁选机磁选，以磁选精矿的形式去除粗粒单质铁，后者含铁69.01％～70.12％(多次测量平均值，下同)、用作炼钢原料。(2) Separation of coarse-grained elemental iron. Under the field strength of 795Gs～810Gs (the average value of multiple measurements, the same below), the dry powder magnetic separator is used for magnetic separation to remove coarse-grained elemental iron in the form of magnetic separation concentrate. The latter contains 69.01% to 70.12% of iron. (The average value of multiple measurements, the same below), used as raw materials for steelmaking.
(3)选择性解离铁酸钙和铁酸镁。利用辊式破碎设备将尾渣细碎至2.5mm～3mm、利用硬度差异选择性解离出铁酸钙和铁酸镁。(3) Selective dissociation of calcium ferrite and magnesium ferrite. The tailings are crushed to 2.5mm-3mm by roller crushing equipment, and calcium ferrite and magnesium ferrite are selectively dissociated by hardness difference.
(4)分离铁酸钙和铁酸镁粗产品。在990Gs～1005Gs场强下磁选，分离出铁酸钙和铁酸镁粗产品。分离后剩余的细粒单质铁含铁71.22％～71.86％、合并入炼钢原料。(4) separation of calcium ferrite and magnesium ferrite crude products. Under the magnetic separation of 990Gs～1005Gs field strength, the crude products of calcium ferrite and magnesium ferrite are separated. The fine-grained elemental iron remaining after separation contains 71.22% to 71.86% of iron, and is incorporated into the steelmaking raw material.
(5)产品提纯。以震动床涡电流分选机提纯铁酸钙和铁酸镁。震动床涡电流分选机的给料槽冲程为3mm、冲次600，产品中杂质矿物含量<2％。分离产生的尾渣用于生产胶凝材料。(5) Product purification. Calcium ferrite and magnesium ferrite are purified by vibrating bed eddy current separator. The stroke of the feeding trough of the vibrating bed eddy current separator is 3mm, the number of strokes is 600, and the content of impurity minerals in the product is less than 2%. The tailings from the separation are used to produce a cementitious material.
实例2：Example 2:
河北省某钢厂综合钢渣磁选尾矿，主要成分为：TFe 22.14％～22.37％，CaO36.15％～37.03％，MgO 8.77％～9.09％，Al2O3 2.22％～2.38％，SiO2 16.35％～16.41％，SO3 0.21％～0.32％。Comprehensive steel slag magnetic separation tailings of a steel plant in Hebei Province, the main components are: TFe 22.14% ~ 22.37%, CaO 36.15% ~ 37.03%, MgO 8.77% ~ 9.09%, Al 2 O 3 2.22% ~ 2.38%, SiO 2 16.35%～16.41%, SO 3 0.21%～0.32%.
使用过程：Use process:
(1)选择性解离粗粒单质铁。取原料钢渣磁选尾矿20kg，首先用颚式破碎机将原料钢渣磁选尾矿破碎至12.82mm～12.96mm，选择性解离出粗粒单质铁粒。(1) Selectively dissociate coarse-grained elemental iron. Take 20kg of raw steel slag magnetic separation tailings, first crush the raw steel slag magnetic separation tailings to 12.82mm-12.96mm with a jaw crusher, and selectively dissociate coarse-grained elemental iron particles.
(2)分离粗颗粒单质铁。在540Gs～552Gs场强下采用干式粉体磁选机磁选，以磁选精矿的形式去除粗粒单质铁，后者含铁68.27％～68.76％、用作炼钢原料。(2) Separation of coarse-grained elemental iron. Under the field strength of 540Gs～552Gs, the dry powder magnetic separator is used for magnetic separation to remove coarse-grained elemental iron in the form of magnetic separation concentrate.
(3)选择性解离铁酸钙和铁酸镁。利用辊式破碎设备将尾渣细碎至2.45mm～2.68mm、利用硬度差异选择性解离出铁酸钙和铁酸镁。(3) Selective dissociation of calcium ferrite and magnesium ferrite. The tailings are crushed to 2.45mm-2.68mm by roller crushing equipment, and calcium ferrite and magnesium ferrite are selectively dissociated by hardness difference.
(4)分离铁酸钙和铁酸镁粗产品。在880Gs～905Gs场强下磁选，分离出铁酸钙和铁酸镁粗产品。分离后剩余的细粒单质铁含铁73.26％～74.44％、合并入炼钢原料。(4) separation of calcium ferrite and magnesium ferrite crude products. Under the magnetic separation of 880Gs～905Gs field strength, the crude products of calcium ferrite and magnesium ferrite are separated. The fine-grained elemental iron remaining after separation contains 73.26% to 74.44% of iron, and is incorporated into the steelmaking raw material.
(5)产品提纯。以震动床涡电流分选机提纯铁酸钙和铁酸镁。震动床涡电流分选机的给料槽冲程为5mm、冲次230，产品中杂质矿物含量<1.63％。分离产生的尾渣用于生产胶凝材料。(5) Product purification. Calcium ferrite and magnesium ferrite are purified by vibrating bed eddy current separator. The stroke of the feeding trough of the vibrating bed eddy current separator is 5mm, the number of strokes is 230, and the content of impurity minerals in the product is less than 1.63%. The tailings from the separation are used to produce a cementitious material.
实例3：Example 3:
辽宁省某钢厂综合钢渣磁选尾矿，主要成分为：TFe 27.31％～27.93％，CaO31.35％～31.08％，MgO 9.77％～9.89％，Al2O3 1.93％～2.16％，SiO2 16.82％～16.97％，SO3 0.30％～0.31％。The comprehensive steel slag magnetic separation tailings of a steel plant in Liaoning Province, the main components are: TFe 27.31% ~ 27.93%, CaO 31.35% ~ 31.08%, MgO 9.77% ~ 9.89%, Al 2 O 3 1.93% ~ 2.16%, SiO 2 16.82%～16.97%, SO 3 0.30%～0.31%.
使用过程：Use process:
(1)选择性解离粗粒单质铁。取原料钢渣磁选尾矿10kg，首先用颚式破碎机将原料钢渣磁选尾矿破碎至12.91mm～13.77mm，选择性解离出粗粒单质铁粒。(1) Selectively dissociate coarse-grained elemental iron. Take 10kg of raw steel slag magnetic separation tailings, first crush the raw steel slag magnetic separation tailings to 12.91mm-13.77mm with a jaw crusher, and selectively dissociate coarse elemental iron particles.
(2)分离粗颗粒单质铁。在1139Gs～1157Gs场强下采用干式粉体磁选机磁选，以磁选精矿形式去除粗粒单质铁，后者含铁70.05％～70.23％、用作炼钢原料。(2) Separation of coarse-grained elemental iron. Under the field strength of 1139Gs～1157Gs, the dry powder magnetic separator is used for magnetic separation to remove coarse-grained elemental iron in the form of magnetic separation concentrate.
(3)选择性解离铁酸钙和铁酸镁。利用辊式破碎设备将尾渣细碎至1.05mm～1.11mm、利用硬度差异选择性解离出铁酸钙和铁酸镁。(3) Selective dissociation of calcium ferrite and magnesium ferrite. The tailings are finely crushed to 1.05mm-1.11mm by roller crushing equipment, and calcium ferrite and magnesium ferrite are selectively dissociated by hardness difference.
(4)分离铁酸钙和铁酸镁粗产品。在990Gs～1110Gs场强下磁选，分离出铁酸钙和铁酸镁粗产品。分离后剩余的细粒单质铁含铁72.11％～72.85％、合并入炼钢原料。(4) separation of calcium ferrite and magnesium ferrite crude products. Under the magnetic separation of 990Gs～1110Gs field strength, the crude products of calcium ferrite and magnesium ferrite are separated. The fine-grained elemental iron remaining after separation contains 72.11% to 72.85% of iron, and is incorporated into the steelmaking raw material.
(5)产品提纯。以震动床涡电流分选机提纯铁酸钙和铁酸镁。震动床涡电流分选机的给料槽冲程为2.5mm、冲次800，产品中杂质矿物含量<2.41％。分离产生的尾渣用于生产胶凝材料。(5) Product purification. Calcium ferrite and magnesium ferrite are purified by vibrating bed eddy current separator. The stroke of the feeding trough of the vibrating bed eddy current separator is 2.5mm, the number of strokes is 800, and the content of impurity minerals in the product is less than 2.41%. The tailings from the separation are used to produce a cementitious material.
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| CN114137060A (en) * | 2021-11-29 | 2022-03-04 | 安徽工业大学 | Method for detecting oxidability of casting residue |
| CN114735954A (en) * | 2022-04-12 | 2022-07-12 | 山东莱钢永锋钢铁有限公司 | Hot disintegration treatment method for converter steel slag |
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