CN116727403A - 一种从含铬铁不锈钢渣中回收铬铁的方法 - Google Patents
一种从含铬铁不锈钢渣中回收铬铁的方法 Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 79
- 229910000604 Ferrochrome Inorganic materials 0.000 title claims abstract description 44
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 37
- 239000010935 stainless steel Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004064 recycling Methods 0.000 title abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000003723 Smelting Methods 0.000 claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 33
- 239000010959 steel Substances 0.000 claims abstract description 33
- 229910052742 iron Inorganic materials 0.000 claims abstract description 27
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000007885 magnetic separation Methods 0.000 claims abstract description 16
- 238000012216 screening Methods 0.000 claims abstract description 7
- 230000006698 induction Effects 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
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- 239000002245 particle Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 239000002440 industrial waste Substances 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract 1
- 239000011651 chromium Substances 0.000 description 14
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 6
- 238000000926 separation method Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 229910052729 chemical element Inorganic materials 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- 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
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- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/32—Obtaining chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
- C22C35/005—Master alloys for iron or steel based on iron, e.g. ferro-alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
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- B09B2101/55—Slag
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
本发明涉及一种从含铬铁钢铁工业废渣中回收金属铬铁资源的方法,具体涉及一种从铬铁不锈钢钢渣中回收铬铁的方法。将不锈钢钢渣通过筛分、一次破碎、五次干式磁选、熔炼、除渣的工艺流程,可实现不锈钢钢渣中铬铁品位从Cr1.0%‑2.0%、Fe8~10%富集到Cr:5%‑8%、Fe:80%‑85%。本发明具有金属铁回收品位高、工艺流程新颖、操作方便、生产成本低以及适用于处理多种含铬铁元素钢渣等优点。
Description
技术领域
本发明涉及一种从钢铁工业废渣中回收铬铁资源的方法,具体涉及一种从含铬铁不锈钢钢渣中回收铬铁的方法。
背景技术
钢渣作为冶炼工艺流程的衍生物随着钢产量的提高,钢渣每年堆存产量不断递增,每吨钢产生的渣量为钢量的10~15%左右。我国钢渣利用率仅为25%左右,国内堆放量已达几亿吨。钢渣分为含铬铁不锈钢钢渣、电炉钢渣以及平炉钢渣,目前所产生的含铬铁不锈钢钢渣因含有铬元素回收利用较低,大部分堆存在冶金渣厂,只有少量的大块渣钢用于回供炼钢工序,这部分含有铬铁的工业废渣目前仍没有得到很好的综合利用。
发明内容
本发明目的在于提供一种从含铬铁不锈钢钢渣中回收铬铁的方法,以实现铁资源的二次利用。
为实现上述目的,本发明采用如下技术方案:
一种从含铬铁不锈钢钢渣中回收铬铁的方法,包括以下步骤:
S1:筛分,将含铬铁不锈钢钢渣中的大块渣铁利用除铁器进行筛分去除;所述含铬铁不锈钢钢渣的铬铁品位为Cr:1.0%~2.0%;Fe:8~10%。
S2:破碎,将S1中去除大块渣铁的含铬铁不锈钢钢渣利用破碎机进行破碎,使破碎后的含铬铁不锈钢钢渣粒度在5mm以下,该粒度下金属物质和尾渣分离效果较好,尾渣中金属含量较低;
S3:五次连续干式磁选,将S2中所得粒度在5mm以下的含铬铁不锈钢钢渣进行干式磁选抛尾,每次得到的精矿继续干式磁选抛尾,经过连续五次干选磁选后最终得到磁性粗钢渣;所述五次干式磁选的磁感应强度依次为0.15T、0.15T、0.18T、0.18T、0.20T,逐步提高磁感应强度,以便获得品位更高的磁性粗钢渣,最终得到磁性粗钢渣的铬铁品位为Cr:2.8%~3.0%;Fe:37.0~41.0%;
S4:熔炼,将S3中所得磁性粗钢渣加入还原剂煤粒,混合后放入石墨坩埚中,在高频感应加热电炉中进行熔炼,将熔炼产物置于空气中冷却;还原剂煤粒的加入量为磁性粗钢渣加入量的10%~30%,熔炼时长为100min~120min,熔炼温度为1500℃~1700℃。
S5:除渣,将S4中所得熔炼产物加入颚式破碎机进行二次破碎,使破碎后的熔炼产物粒度在20mm~25mm。
本发明的有益效果如下:
1.通过将破碎加磁选后铬铁品位为Cr 2.8%-3.0%、Fe37.0~41.0%的磁性粗钢渣放置高频感应加热电炉中,同时加入还原剂煤粒进行高温熔炼,可实现铁与渣的高效分离;
2.含铬铁不锈钢钢渣经过高频感应加热电炉获得的磁性产物,铬铁品位在5%-8%、Fe:80%-85%,并且粒度为20mm~25mm之间,同时由于铁铬品位高、粒度大,有利于钢渣的直接回收使用;
3.所述方法相比于传统工艺方法,不仅所得产物铁品位更高,而且采用干磨干选的工艺流程更简单,操作更方便,具有较好的经济性和实用性。
附图说明
图1为本发明的工艺流程图。
具体实施方式
下面结合附图和具体实施方式对本发明作进一步解释说明。
实施例1
S1:筛分,取钢渣铬铁品位在Cr:1.30%、Fe 8.49%的含铬铁不锈钢钢渣30kg,利用除铁器将大块渣铁分离,得到去除大块渣铁的含铬铁不锈钢钢渣28.95kg,其中大块渣铁的粒度≥100mm,并且分离出的大块渣铁铁品位含量高,可直接作为精矿回收利用。
S2:破碎,将S1中去除大块渣铁的含铬铁不锈钢钢渣利用颚式破碎机进行破碎,使破碎后的含铬铁不锈钢钢渣粒度在5mm以下;
S3:干式磁选,将S2中所得粒度在5mm以下的含铬铁不锈钢钢渣利用皮带式永磁滚筒进行干式磁性分选,得到磁性粗钢渣1.15kg和弱磁性尾渣27.80kg;其中皮带式永磁滚筒表面的磁感应强度为0.15T,得到的磁性粗钢渣的品位为Cr 2.86%、Fe39.50% 。
S4:熔炼,将S3中所得磁性粗钢渣称取1kg放置在φ25mm的石墨坩埚中,加入200g煤粒作为还原剂,采用GP-160型高频感应加热电炉进行熔炼,熔炼频率为2100HZ,熔炼时间为110min,熔炼温度为1700℃,并采用循环冷却水的方式对炉体降温。熔炼结束后,将坩埚放在空气中自然冷却。
S5:除渣,将S4中所得熔炼产物加入颚式破碎机进行二次破碎,使破碎后的熔炼产物粒度在20~25mm。目的在于经过反复挤压破碎使渣粉脱离,以获得铁品位较高的熔炼产物,最终获得的熔炼产物铬铬铁品位在Cr 6.92%、Fe 84.7%,数据如下表1所示:
表1 实施例1处理前后产物化学元素对比
上述过程中分选出的弱磁性尾渣铁品位含量低,可合并处理后作为公路基建材料,实现固体废弃物零堆存的目标。
实施例2
S1:筛分,钢渣铬铁品位在Cr 1.05%、Fe 9.06%的含铬铁不锈钢钢渣40kg,利用除铁器将大块渣铁分离,得到去除大块渣铁的含铬铁不锈钢钢渣38.25kg,其中大块渣铁的粒度≥100mm,并且分离出的大块渣铁铁品位含量高,可直接作为精矿回收利用。
S2:一次破碎,将S1中去除大块渣铁的含铬铁不锈钢钢渣利用颚式破碎机进行破碎,使破碎后的含铬铁不锈钢钢渣粒度在5mm以下;
S3:干式磁选,将S2中所得粒度在5mm以下的含铬铁不锈钢钢渣利用皮带式永磁滚筒进行干式磁性分选,得到磁性粗钢渣1.75kg和弱磁性尾矿36.50kg;其中皮带式永磁滚筒表面的磁感应强度为0.15T,经分析测定得到的磁性粗钢渣铬铁品位为Cr 2.95%、Fe40.32% 。
S4:熔炼,将S3中所得磁性粗钢渣称取1kg,还原剂煤粒160g混匀,放置在φ25mm的石墨坩埚中,采用GP-160型高频感应加热电炉进行熔炼,熔炼频率为2200HZ,熔炼时间为100min,熔炼温度为1650℃,并采用循环冷却水的方式对炉体降温。熔炼结束后,将坩埚放在空气中自然冷却。
S5:除渣,将S4中所得熔炼产物加入颚式破碎机进行二次破碎,使破碎后的熔炼产物粒度在20~25mm。目的在于经过反复挤压破碎使渣粉脱离,以获得铁品位较高的熔炼产物铬铁品位在Cr 6.00%、Fe 87.6%,具体数据如下表2所示:
表2 实施例2处理前后产物化学元素对比
上述过程中分选出的弱磁性尾渣铁品位含量低,可合并处理后作为公路基建材料,实现固体废弃物零堆存的目标。
Claims (6)
1.一种从含铬铁不锈钢钢渣中回收铬铁的方法,其特征在于:包括以下步骤:
S1:筛分,将含铬铁不锈钢钢渣中的大块渣铁利用除铁器进行筛分去除;
S2:破碎,将S1中去除大块渣铁的含铬铁不锈钢钢渣利用破碎机进行破碎,使破碎后的含铬铁不锈钢钢渣粒度在5mm以下;
S3:五次连续干式磁选,将S2中所得粒度在5mm以下的含铬铁不锈钢钢渣进行干式磁选抛尾,每次得到的精矿继续干式磁选抛尾,经过连续五次干选磁选后最终得到磁性粗钢渣;
S4:熔炼,将S3中所得磁性粗钢渣加入还原剂煤粒,混合后放入石墨坩埚中,在高频感应加热电炉中进行熔炼,将熔炼产物置于空气中冷却;
S5:除渣,将S4中所得熔炼产物加入颚式破碎机进行二次破碎,使破碎后的熔炼产物粒度在20~25mm。
2.根据权利要求1所述一种从含铬铁不锈钢钢渣中回收铬铁的方法,其特征在于:所述S1中含铬铁不锈钢钢渣的铬铁品位为Cr:1.0%~2.0%;Fe:8~10%。
3.根据权利要求1所述一种从含铬铁不锈钢钢渣中回收铬铁的方法,其特征在于:所述S3中干式磁选的磁感应强度为0.15~0.20T。
4.根据权利要求1所述一种从含铬铁不锈钢钢渣中回收铬铁的方法,其特征在于:所述S3中磁性粗钢渣的铬铁品位为Cr: 2.8%~3.0%;Fe:37.0%~41.0%。
5.根据权利要求1所述一种从含铬铁不锈钢钢渣中回收铬铁的方法,其特征在于:所述S4中还原剂煤粒的加入量为磁性粗钢渣加入量的10%~30%,熔炼时长为100min~120min,熔炼温度为1500℃~1700℃。
6.根据权利要求1所述一种从含铬铁不锈钢钢渣中回收铬铁的方法,其特征在于:所述S4中熔炼产物中的铬铁品位Cr:5%~8%、Fe:80%~85%。
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