CN102899436A - Method for directly reducing iron with intermediate frequency furnace - Google Patents
Method for directly reducing iron with intermediate frequency furnace Download PDFInfo
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- CN102899436A CN102899436A CN2012103599491A CN201210359949A CN102899436A CN 102899436 A CN102899436 A CN 102899436A CN 2012103599491 A CN2012103599491 A CN 2012103599491A CN 201210359949 A CN201210359949 A CN 201210359949A CN 102899436 A CN102899436 A CN 102899436A
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Abstract
The invention discloses a method for directly reducing iron with an intermediate frequency furnace, which is characterized by comprising the following steps: mixing a desulfurizer, a dephosphorizer and a reducer, drying until the water content of the material is lower than 3%, and pulverizing until the particle size of the material is less than 1.5mm, thereby obtaining a reducing additive; pulverizing iron ores, and drying until the water content of the material is lower than 3%; heating the reducing additive and the iron ores in an intermediate frequency furnace to reduce iron oxide, thereby obtaining the simple substance iron; and cooling the material in the intermediate frequency furnace, pulverizing, and carrying out magnetic separation to separate out the reduced iron. According to the invention, any grade of iron ores and right amounts of carbon blocks as a reducer can be mixed to directly reduce the solid-state iron ores into spongy iron in the intermediate frequency furnace, and the metallization rate is up to higher than 96%.
Description
Technical field
The present invention relates to a kind of method of intermediate frequency furnace direct-reduced iron, belong to the direct-reduced iron processing technique field.
Background technology
System for blast furnace ironmaking (comprising coking, sintering, blast furnace), application and development through the centuries, its technology is quite perfect, but long because of its technical process, investment is large, environmental pollution is serious, and flexibility of operation is poor, be only suitable for the country in those industrial initial developments, produce conventional products, elementary steel, and added value is very low.In developed country, blast furnace technology is faced with superseded, and living space more greatly reduces.
Society enters material after the epoch, and the steel of market demand no longer are traditional materials, and the electric furnace ironmaking take steel scrap as main raw material can promote steel product quality and property, can shorten the steel smelting cycle, reduces starting material and power wastage.But according to the statistics of national steel scrap association, China's steel scrap total demand was 12,000 ten thousand tons in 2008, increased by 1,000 ten thousand tons than total amount consumed in 2007, and resource gap is larger.2,000 ten thousand tons of the self-produced steel scraps of annual iron and steel enterprise, society produces useless 4,000 ten thousand tons, 1,200 ten thousand tons of import steel scraps, aggregate resource is tight slightly.Annual steel scrap market presents the operation situation that rises and fall unceasingly continuously.Also because steel products are advanced towards miniaturization and, function in recent years, the Composite future development, therefore non-metallic material and non-ferrous metal usage ratio increase in the steel, cause waste steel quality constantly to descend.Steel scrap is as the electric furnace raw material, because its source is different, chemical component fluctuation is very large, detrimental impurity Sn, As, Cu etc. are almost in the 100% residual steel, and be difficult to grasp, control, this has brought great difficulty for the electric steel operation, and the domestic price run at high level, especially the raising of bottom line price has announced to use the termination in cheap iron and steel scrap resource steel-making epoch.
And direct-reduced iron is the low-carbon (LC) vesicular material that smart iron powder or ferric oxide form through low-temperature reduction in stove, the impurity such as sulphur, phosphorus, arsenic, zinc, copper are all very low in the direct-reduced iron, if with a certain proportion of direct-reduced iron (30-50%) as thinner and steel scrap collocation not only can increase steel homogeneity, improve the physical properties of steel, thereby reach the purpose of production high-quality steel, Clean Steel, can also improve electric furnace throughput, reduce power consumption and production cost.Therefore, direct-reduced iron is not only the surrogate of high-quality steel scrap, or the pure raw material of production high-quality steel, special steel.Therefore increasingly vigorous to the demand of direct-reduced iron, market capacity strengthens day by day, and also there are a lot of problems in China's direct-reduced iron:
(1) industrial scale is too small, and method is ancient, production capacity is little, energy consumption is high, seriously polluted;
(2) starting material of direct-reduced iron requirement must be the pure iron ores of higher-grade, low gangue, and China is very rare, therefore lack stable raw material supply channel;
(3) owing to limited by natural gas source, the gas base directly reducing slower development;
(4) lack unified planning, fail to build large scale commercial product DRI(direct-reduced iron) manufacturing enterprise.
World's metallurgy industry is decided to be zero to the direct-reduced iron of China (sponge iron) output.In the September, 2007, the General Secretary of the People's Republic of China (PRC) in person visits and has investigated Australian sponge iron company sponge iron production line, the attention of China to sponge iron has been described, June 20 nineteen ninety-five, State Planning Commission, State Economic and Trade Commission, the Ministry of Foreign Trade and Economic Cooperation ordered " direct-reduced iron " classified as the foreign investment industry of encouraging jointly, in the ferrous metals industry first, 2004,2005 every year by National Development and Reform Committee and State Economic and Trade Commission, classifies country's project of encouraging investment as.From the demand for development of national economy and development and the market requirement of Iron And Steel Industry, China has become the first consumption steel big country, always relies on import DRI/HBI(direct-reduced iron/hot wafering) be unpractical, impossible.
Summary of the invention
The object of the invention is to, a kind of method of intermediate frequency furnace direct-reduced iron is provided.In China's low-grade iron ore resource and enrich on the basis of coal resources, after the iron ore of any grade and an amount of reductive agent being mixed, become sponge iron through intermediate frequency furnace with direct-reduction.
Technical scheme of the present invention.The method of intermediate frequency furnace direct-reduced iron comprises the steps,
A, sweetening agent, dephosphorizing agent, reductive agent mixed after, dry again to material moisture less than 3%, the material after the oven dry is pulverized, the crushing material granularity obtains reducing additive below 1.5mm;
B, iron ore is pulverized post-drying, dry to material moisture less than 3%;
C, will reduce additive and iron ore and send into heating in the intermediate frequency furnace, iron oxide reduction obtains fe;
Material in d, the intermediate frequency furnace carries out fragmentation after cooling, by magnetic separation, the iron of reduction is selected.
The method of above-mentioned intermediate frequency furnace direct-reduced iron, among the step a, reductive agent is carbon dust.
The method of above-mentioned intermediate frequency furnace direct-reduced iron, among the step c, the intermediate frequency heating process is: be preheated to 300 ℃-500 ℃ at preheating section first, enter the section that heats up and be warming up to 900 ℃-950 ℃, be heated to 950 ℃-1100 ℃ at conversion zone again and carry out reduction reaction, then material is come out of the stove after being cooled to below 200 ℃.
The method of above-mentioned intermediate frequency furnace direct-reduced iron, in the steps d, the iron that magnetic separation obtains is by the briquetting press compound stalk forming.
Existing direct-reduced iron working method can be divided into two large classes: use the gas base directly reducing method of gaseous reducing agent and the coal-based direct reduction method of use solid reductant.No matter be which kind of method, the iron ore raw material grade of reducing is all required too high (TFe 〉=66%).The present invention becomes sponge iron through intermediate frequency furnace with solid-state direct-reduction after the iron ore of any grade can being mixed as reductive agent with an amount of charcoal piece, and degree of metalization can reach more than 96%.Needed energy is to be inputted by external electric energy in the production process, in whole technological process, there is not outside air to enter, carbon institute's expellant gas in the process of reduced iron only has CO gas, whole flue gas obtains pure CO gas after purifying, can be directly used in generating, for reduction intermediate frequency furnace self.Method of the present invention has been broken away from the restriction to iron ore grade and colliery quality and kind, reductive agent both can be coking coal, brown coal, it also can be the carbon dust of enrichment in large trade waste degree of depth resource utilization removal process, whole technique is drawn materials abundant, technique is simple, technology is reliable, environmental-protecting performance is good, significantly reduced production cost, particularly improved the added value in the production process, can be very low initial amount, the ultralow grade valuable metal ore deposit that at all can not be referred to as ore deposit enrichment of ore-forming in slag or in the off-gas recovery thing in the production process of direct-reduced iron forms new resource.
Embodiment
Embodiments of the invention 1.The method of intermediate frequency furnace direct-reduced iron comprises the steps,
A, sweetening agent, dephosphorizing agent, reductive agent mixed after, dry again to material moisture less than 3%, the material after the oven dry is pulverized, the crushing material granularity obtains reducing additive below 1.5mm; Wherein sweetening agent is that used sweetening agent, the dephosphorizing agents of existing Iron industry such as lime or rhombspar are that the used dephosphorizing agent of Iron industry, reductive agent are carbon dust.
B, iron ore is pulverized post-drying, material moisture is less than 3%;
C, will reduce additive and iron ore and send into heating in the intermediate frequency furnace, iron oxide reduction obtains fe; The proportioning of reduction additive and iron ore is determined according to the content of the iron in the iron ore, sulphur, phosphorus.The intermediate frequency heating process is: be preheated to 300 ℃-500 ℃ at preheating section first, enter the section that heats up and be warming up to 900 ℃-950 ℃, be heated to 950 ℃-1100 ℃ at conversion zone again and carry out reduction reaction, then material is come out of the stove after being cooled to below 200 ℃.
Material in d, the intermediate frequency furnace carries out fragmentation after cooling, by magnetic separation, the iron of reduction is selected, again by the briquetting press compound stalk forming.
Embodiments of the invention 2.The method of intermediate frequency furnace direct-reduced iron comprises the steps,
A, sweetening agent, dephosphorizing agent, reductive agent mixed after, dry again to material moisture less than 3%, the material after the oven dry is pulverized, the crushing material granularity obtains reducing additive below 1.5mm; Wherein sweetening agent is that used sweetening agent, the dephosphorizing agents of existing Iron industry such as lime or rhombspar are that the used dephosphorizing agent of Iron industry, reductive agent are carbon dust.
B, iron ore is pulverized post-drying, material moisture is less than 3%.
C, will reduce additive and iron ore and send into heating in the intermediate frequency furnace, iron oxide reduction obtains fe.The intermediate frequency heating process is: be preheated to 400 ℃ at preheating section first, enter the section that heats up and be warming up to 950 ℃, be heated to 1000 ℃ at conversion zone again and carry out reduction reaction, then material is come out of the stove after being cooled to below 200 ℃.
Material in d, the intermediate frequency furnace carries out fragmentation after cooling, by magnetic separation, the iron of reduction is selected, again by the briquetting press compound stalk forming.
Embodiments of the invention 3.The method of intermediate frequency furnace direct-reduced iron comprises the steps,
A, sweetening agent, dephosphorizing agent, reductive agent mixed after, dry again to material moisture less than 3%, the material after the oven dry is pulverized, the crushing material granularity obtains reducing additive below 1.5mm; Wherein sweetening agent is that used sweetening agent, the dephosphorizing agents of existing Iron industry such as lime or rhombspar are that the used dephosphorizing agent of Iron industry, reductive agent are carbon dust.
B, iron ore is pulverized post-drying, material moisture is less than 3%.
C, will reduce additive and iron ore and send into heating in the intermediate frequency furnace, iron oxide reduction obtains fe.The intermediate frequency heating process is: be preheated to 450 ℃ at preheating section first, enter the section that heats up and be warming up to 920 ℃, be heated to 1050 ℃ at conversion zone again and carry out reduction reaction, then material is cooled to come out of the stove behind the normal temperature.
Material in d, the intermediate frequency furnace carries out fragmentation after cooling, by magnetic separation, the iron of reduction is selected, again by the briquetting press compound stalk forming.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, any technical solution of the present invention content that do not break away from,, all still belong in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment does according to technical spirit of the present invention.
Claims (4)
1. the method for an intermediate frequency furnace direct-reduced iron is characterized in that: comprises the steps,
A, sweetening agent, dephosphorizing agent, reductive agent mixed after, dry again to material moisture less than 3%, the material after the oven dry is pulverized, the crushing material granularity obtains reducing additive below 1.5mm;
B, iron ore is pulverized post-drying, dry to material moisture less than 3%;
C, will reduce additive and iron ore and send into heating in the intermediate frequency furnace, iron oxide reduction obtains fe;
Material in d, the intermediate frequency furnace carries out fragmentation after cooling, by magnetic separation, the iron of reduction is selected.
2. the method for intermediate frequency furnace direct-reduced iron according to claim 1, it is characterized in that: among the step a, reductive agent is carbon dust.
3. the method for intermediate frequency furnace direct-reduced iron according to claim 1, it is characterized in that: among the step c, the intermediate frequency heating process is: be preheated to 300 ℃-500 ℃ at preheating section first, enter the section that heats up and be warming up to 900 ℃-950 ℃, be heated to 950 ℃-1100 ℃ at conversion zone again and carry out reduction reaction, then material is come out of the stove after being cooled to below 200 ℃.
4. the method for intermediate frequency furnace direct-reduced iron according to claim 1, it is characterized in that: in the steps d, the iron that magnetic separation obtains is by the briquetting press compound stalk forming.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103937923A (en) * | 2014-03-26 | 2014-07-23 | 沪东重机有限公司 | Desulphurization method for base iron of nodular cast iron |
| CN113265507A (en) * | 2021-06-28 | 2021-08-17 | 王恩礼 | Oxygen-free reduction process for iron oxide ore and closed reduction converter thereof |
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| CN101538634A (en) * | 2009-02-05 | 2009-09-23 | 丁家伟 | Smelting process and device of pure iron |
| CN102559976A (en) * | 2011-12-20 | 2012-07-11 | 沈阳博联特熔融还原科技有限公司 | Preparing method for direct reduced iron using low grade high phosphorus iron ore as raw materials |
| CN102634621A (en) * | 2012-04-09 | 2012-08-15 | 北京神雾环境能源科技集团股份有限公司 | Device and method for treating refractory iron ore |
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2012
- 2012-09-25 CN CN2012103599491A patent/CN102899436A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101538634A (en) * | 2009-02-05 | 2009-09-23 | 丁家伟 | Smelting process and device of pure iron |
| CN102559976A (en) * | 2011-12-20 | 2012-07-11 | 沈阳博联特熔融还原科技有限公司 | Preparing method for direct reduced iron using low grade high phosphorus iron ore as raw materials |
| CN102634621A (en) * | 2012-04-09 | 2012-08-15 | 北京神雾环境能源科技集团股份有限公司 | Device and method for treating refractory iron ore |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103937923A (en) * | 2014-03-26 | 2014-07-23 | 沪东重机有限公司 | Desulphurization method for base iron of nodular cast iron |
| CN103937923B (en) * | 2014-03-26 | 2016-06-29 | 沪东重机有限公司 | A kind of sulfur method of spheroidal graphite cast-iron base iron |
| CN113265507A (en) * | 2021-06-28 | 2021-08-17 | 王恩礼 | Oxygen-free reduction process for iron oxide ore and closed reduction converter thereof |
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