CN101713007B - Technique method for directly producing sponge iron by carrying out deep reduction of vanadium-extracted tailings - Google Patents

Technique method for directly producing sponge iron by carrying out deep reduction of vanadium-extracted tailings Download PDF

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Publication number
CN101713007B
CN101713007B CN2009102355464A CN200910235546A CN101713007B CN 101713007 B CN101713007 B CN 101713007B CN 2009102355464 A CN2009102355464 A CN 2009102355464A CN 200910235546 A CN200910235546 A CN 200910235546A CN 101713007 B CN101713007 B CN 101713007B
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iron
tailings
technique
magnetic separation
sponge iron
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CN101713007A (en
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杨慧芬
景丽丽
王静静
忤晓丹
党春阁
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Beijing University of Technology
University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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Abstract

The invention relates to a technique method for directly producing sponge iron by carrying out deep reduction on extracted vanadium tailings, belonging to the field of iron making. The method adopts brown coal as the reducing agent, and simultaneously CaO is added as slag former and used for increasing alkalinity to synergize with Na2O and K2O in the tailings to react with SiO2 and Al2O3 to generate zeolite-like stable mineral so as to boost extraction and separation of sponge iron in products of deep reduction. The products of deep reduction are subject to two-section ore grinding-two-section low intensity magnetic separation technique to obtain sponge iron with iron grade larger than 90% and TiO2 smaller than 0.20%. The invention is simple in technique and easy to control, and has large reserves of raw materials and low price; the product can be used as raw material for steel making; other impurities meet steel making requirements, the technique flow of processing iron ore into rolled steel is shortened, the environment pollution caused by sintering, pelletizing and blast furnace iron making of iron ore concentrate obtained by other methods can be avoided, and the invention has obvious environment benefit and energy conservation and consumption reduction effects.

Description

A kind of processing method of directly producing sponge iron by carrying out deep reduction on extracted vanadium tailings
Technical field
The invention belongs to the ironmaking field, relate to a kind of solid waste---the processing method of directly producing sponge iron by carrying out deep reduction on extracted vanadium tailings, this method is directed to high-content Na especially 2O, K 2O and high-content TiO 2The drastic reduction-ore grinding-low intensity magnetic separation of industrial waste tailings obtain sponge iron, with as the high-quality steelmaking feed.
Background technology
Tailings in vanadium extraction is the vanadium titano-magnetite blast-furnace smelting, add Na 2CO 3Remaining residue after the roasting vanadium extraction wherein contains the TFe more than 30%, about 10% TiO 2And a spot of V 2O 5, be a kind of important extraction TFe, TiO 2Waste resource.But because the vanadium extraction process has added a large amount of Na 2CO 3, cause the Na that remains tailings 2O, K 2O content is very high.Na 2O content can be up to more than 4%, K 2O content can be up to more than 1.5%.The waste residue utilization difficulty of high basicity like this is very big, causes nobody shows any interest in so far, have to store up the havoc surrounding enviroment for a long time in the open.In order to reduce pollution, make full use of TFe, TiO in the tailings 2Two kinds of valuable constituents, University of Science ﹠ Technology, Beijing is being studied on the basis the tailings in vanadium extraction process mineralogy, and to the research and the accumulation of refractory iron ore and iron content Waste recovery iron, front and back have been carried out several different methods to tailings in vanadium extraction and have been extracted wherein TFe, TiO in conjunction with in recent years 2Research.Remove Na as 1. first water elution 2O, K 2O, the method for magnetizing roasting-magnetic separation again; 2. spiral chute-magnetic selection method; 3. the iron method is put forward in flotation, or the like.Wherein,, produce a large amount of alkaline waste waters though 1. method can reclaim iron wherein preferably, simultaneously washing back tailings to filter, oven dry etc., technological process is loaded down with trivial details; Though 2. method can select the iron ore concentrate of part grade about 52%, the rate of recovery is very low, ability about 20%; Though 3. method can strengthen the separation of iron mineral by the effect of medicament, but because iron mineral most of form with sosoloid in tailings exists, even granularity is milled down to-10 μ m, the iron mineral of monomer dissociation still seldom, therefore iron mineral wherein also can't be well extracted in flotation from tailings, must seek more suitably method.
Summary of the invention
The present invention seeks to from tailings in vanadium extraction, to extract the difficulty of iron mineral, carry successful Application Na in the iron dephosphorization at the Wuhan Iron and Steel Plant high-phosphor oolitic hematite according to University of Science ﹠ Technology, Beijing at existing method 2CO 3Put forward the experience that phosphorus falls in iron, adopt the processing method of gushing drastic reduction-ore grinding-magnetic separation and from tailings in vanadium extraction, directly obtain sponge iron to use as raw scrap material.More traditional ore dressing-the pelletizing of this processing method-ironmaking obtains molten iron, and steelmaking process is simple again, cost of investment is low, energy consumption is low.
A kind of processing method of directly producing sponge iron by carrying out deep reduction on extracted vanadium tailings, its step, condition are: be raw material with tailings in vanadium extraction, brown coal, CaO 1,, raw material is mixed, weight percent in the raw material is: tailings in vanadium extraction 60-80%, brown coal 20-30%, CaO10-20%, contain TiO at iron content 32-40% in the tailings in vanadium extraction 26-15% contains Na 2O3-6%.2, be not higher than roasting 40~60min under 1100 ℃ of conditions in temperature; Primary grinding, one section low intensity magnetic separation are carried out in the cooling back in grinding machine.Primary grinding concentration is 60~80% (solid weight accounts for the gross weight of solid and water), and product granularity-0.074mm accounts for about 85~90%, ore milling product magnetic separation under magneticstrength 80kA/m condition.3, magnetic separation product continues secondary grinding, and ore milling concentration is 50~60%, and product granularity-0.030mm accounts for about 80~90%, and ore milling product magnetic separation under two sections magneticstrength 64kA/m conditions obtains sponge iron.
The reductive agent that drastic reduction adopts in the processing method of the present invention is brown coal, adds CaO simultaneously as the Na in slag former and the collaborative tailings of increase basicity 2O, K 2O and SiO 2, Al 2O 3Reaction generates the resistant mineral of class zeolite, the extraction that promotes sponge iron in the drastic reduction product with separate.The drastic reduction product is handled through secondary grinding-two section weak magnetic separation process, can obtain the iron grade greater than 90%, TiO 2Sponge iron less than 0.20%, this product can be directly as steelmaking feed.
The inventive method has following characteristics: 1. products obtained therefrom is a steelmaking feed, and wherein iron content is more than 90%, and the rate of recovery 75%~80% contains TiO 2Below 0.20%, other impurity satisfy steel-making requirements.Therefore, shorten the technical process of being processed into steel from iron ore, avoided the environmental pollution that the additive method gained is iron ore concentrate sintered, pelletizing, blast furnace ironmaking produced, had tangible environmental benefit and energy conservation and consumption reduction effects; 2. processing method itself is simple than additive method, easily control; 3. adding reductive agent is brown coal, and reserves are big, and price is low; 4. slag former is CaO, and reserves are big, and price is low; What 5. utilize is waste resource, has great importance for the valuable metals such as iron that make full use of in the waste resource.
Description of drawings
Figure 1 shows that carrying out deep reduction on extracted vanadium tailings-ore grinding-weak magnetic separation process flow process.
Embodiment
Embodiment 1
Tailings in vanadium extraction iron content 36.51%, contain TiO 29.65%, contain Na 2O 4.38%.The drastic reduction condition is: tailings in vanadium extraction: brown coal: CaO=100: 40: 15, behind the mixing in retort furnace 1100 ℃ of following reducing roasting 40min; Cooling; Be milled to granularity-0.074mm at ore milling concentration 70% and account for 87%, in magneticstrength 80kA/m magnetic separation.Magnetic separation product at ore milling concentration be 55% be milled to-0.030mm accounts for about 90%, magnetic separation obtains sponge iron under magneticstrength 64kA/m condition.Obtain iron level 90.85%, TiO 2Content 0.17%, other foreign matter contents satisfy the sponge iron of steel-making requirements.
Embodiment 2
Tailings in vanadium extraction iron content 32.84%, contain TiO 212.21%, contain Na 2O 4.90%.The drastic reduction condition is: tailings in vanadium extraction: brown coal: CaO=100: 30: 20, behind the mixing in retort furnace 1050 ℃ of following reducing roasting 50min; Cooling; Be milled to granularity-0.074mm at ore milling concentration 70% and account for 85%, in magneticstrength 80kA/m magnetic separation.Magnetic separation product at ore milling concentration be 55% be milled to-0.030mm accounts for about 88%, magnetic separation obtains sponge iron under magneticstrength 64kA/m condition.Obtain iron level 91.24%, TiO 2Content 0.15%, other foreign matter contents satisfy the sponge iron of steel-making requirements.
Embodiment 3
Tailings in vanadium extraction iron content 35.67%, contain TiO 210.15%, contain Na 2O 4.58%.The drastic reduction condition is: tailings in vanadium extraction: brown coal: CaO=100: 33: 20, behind the mixing in retort furnace 1000 ℃ of following reducing roasting 60min; Cooling; Be milled to granularity-0.074mm at ore milling concentration 70% and account for 88%, in magneticstrength 80kA/m magnetic separation.Magnetic separation product at ore milling concentration be 55% be milled to-0.030mm accounts for about 90%, magnetic separation obtains sponge iron under magneticstrength 64kA/m condition.Obtain iron level 91.64%, TiO 2Content 0.14%, other foreign matter contents satisfy the sponge iron of steel-making requirements.

Claims (1)

1. the processing method of a directly producing sponge iron by carrying out deep reduction on extracted vanadium tailings is characterized in that processing step is:
1), be raw material with tailings in vanadium extraction, brown coal, CaO, raw material is mixed, the weight percent in the raw material is: tailings in vanadium extraction 60-80%, brown coal 20-30%, CaO10-20%, contain TiO at iron content 32-40% in the tailings in vanadium extraction 26-15% contains Na 2O3-6%; Each component concentration sum is absolutely in the raw material;
2), be not higher than roasting 40~60min under 1100 ℃ of conditions in temperature; Primary grinding, one section low intensity magnetic separation are carried out in the cooling back in grinding machine; Primary grinding concentration is 60~80%, and described concentration is the gross weight that solid weight accounts for solid and water, and product granularity-0.074mm accounts for 85~90%, ore milling product magnetic separation under magneticstrength 80kA/m condition;
3), magnetic separation product continues secondary grinding, ore milling concentration is 50~60%, product granularity-0.030mm accounts for 80~90%, ore milling product magnetic separation under two sections magneticstrength 64kA/m conditions obtains sponge iron.
CN2009102355464A 2009-10-12 2009-10-12 Technique method for directly producing sponge iron by carrying out deep reduction of vanadium-extracted tailings Expired - Fee Related CN101713007B (en)

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Publication number Priority date Publication date Assignee Title
CN101838743B (en) * 2010-06-23 2012-05-23 攀枝花学院 Method for recovering ferrum, vanadium, chromium and gallium from vanadium extraction tailings
CN102251119B (en) * 2011-07-04 2013-06-05 中国科学院过程工程研究所 Method for recycling vanadium extraction tailings
CN102424874A (en) * 2011-12-05 2012-04-25 武汉科技大学 Oolitic hematite aluminum and iron separation method
CN102658369A (en) * 2012-05-18 2012-09-12 北京科技大学 Lead slag and coal-based direct reduction method for producing metal iron powder
CN102776364B (en) * 2012-08-16 2013-10-23 中冶北方(大连)工程技术有限公司 Process for recovering titanium and iron from titanomagnetite tailings
CN102851512B (en) * 2012-09-10 2014-09-03 攀钢集团西昌钢钒有限公司 Method for producing iron alloy through vanadium extraction tailing reduction smelting
CN103103341A (en) * 2013-01-29 2013-05-15 东北大学 Control method of iron particle granularity in deep reduction material
CN103276213B (en) * 2013-05-23 2014-08-06 长沙市东新矿冶科技开发有限公司 One-step new technology for separating ferrum, titanium and vanadium in vanadium-titanium-ferrum concentrate
CN103602820A (en) * 2013-10-11 2014-02-26 河北钢铁股份有限公司承德分公司 Method for efficiently recovering iron, vanadium and chromium from extracted vanadium tailings
CN103643033B (en) * 2013-12-06 2015-04-15 北京科技大学 Method for reducing titanium in direct reduction iron of seashore titanomagnetite by utilizing composite additive
CN106086430A (en) * 2016-06-15 2016-11-09 江苏省冶金设计院有限公司 The method of comprehensive utilization vanadium slag
CN106086431A (en) * 2016-06-15 2016-11-09 江苏省冶金设计院有限公司 Vanadium slag is carried out method and the application thereof of integrated treatment
CN106906353A (en) * 2017-03-28 2017-06-30 江苏省冶金设计院有限公司 Process the method and system of schreyerite
CN106893856A (en) * 2017-03-28 2017-06-27 江苏省冶金设计院有限公司 Process the method and system of schreyerite
CN106834728A (en) * 2017-03-31 2017-06-13 江苏省冶金设计院有限公司 Process the method and system of vanadium chromium slag
CN109880957B (en) * 2019-03-18 2020-06-05 东北大学 Molten iron pretreatment composite desiliconizing and dephosphorizing agent and preparation method thereof
CN110699554A (en) * 2019-10-16 2020-01-17 中冶赛迪工程技术股份有限公司 Method for producing vanadium-rich iron from vanadium-rich slag

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