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Method for preparing direct reduction iron and gelation materials through low-grade iron ore

A technology for lean iron ore and reduced iron, which is applied in the field of preparing direct reduced iron and cementitious materials by using lean iron ore, and can solve the problem of inability to prepare cementitious materials and iron, low yield of direct reduced iron, and poor iron ore. problems such as low iron content, to achieve the effect of improving the utilization effect and the added value of the product, shortening the preparation cycle and process, and low cost

Inactive Publication Date: 2015-09-30
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But all there are some problems in the above-mentioned existing technology of utilizing lean iron ore: as because the iron content of lean iron ore is few, when producing direct reduced iron, the productive rate of direct reduced iron is not high
However, these methods have certain disadvantages and deficiencies
The disadvantages of producing direct reduced iron from iron concentrate powder are high energy consumption and low economic benefits
Cementitious material is a widely used powdery substance, mainly used as construction materials and mine fillings, but the existing technology cannot prepare cementitious materials and iron through lean iron ore, so the lean iron ore is seriously wasted resource

Method used

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  • Method for preparing direct reduction iron and gelation materials through low-grade iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method of utilizing lean iron ore of the present invention to prepare direct reduced iron and cementitious material comprises the following steps:

[0024] 1) Take lean iron ore, Al 2 o 3 , lignite, and limestone, a mixture of lime and calcium carbonate in any proportion, dry, crush and grind the lean iron ore and add Al 2 o 3 , lignite, and limestone, lime and calcium carbonate mixture in any proportion to obtain the furnace raw materials, and then place the furnace raw materials into the furnace after briquetting, and carry out reduction and roasting reactions under a reducing atmosphere;

[0025] 2) The product of the reduction and roasting reaction is taken out of the furnace, and then cooled, crushed and magnetically separated to obtain directly reduced iron and gelling materials.

[0026] In step 1), dry, crush and grind the poor iron until the particle size is less than 300 mesh, and then add Al 2 o 3 , lignite, and limestone, a mixture of lime and calci...

Embodiment 2

[0032] The method of utilizing lean iron ore of the present invention to prepare direct reduced iron and cementitious material comprises the following steps:

[0033] 1) Take Al 2 o 3 , lean iron ore, coking coal, and a mixture of limestone, lime, calcium carbonate, fluorite and calcium sulfate in any proportion, dry, crush and grind the lean iron ore and add Al 2 o 3 , coking coal and limestone, lime, calcium carbonate, fluorite and calcium sulfate in any proportion of the mixture to obtain the raw materials into the furnace, and then the raw materials into the furnace are compacted and placed in the furnace, and the reduction and roasting reactions are carried out in a reducing atmosphere ;

[0034] 2) The product of the reduction and roasting reaction is taken out of the furnace, and then cooled, crushed and magnetically separated to obtain directly reduced iron and gelling materials.

[0035] In step 1), dry, crush and grind the poor iron until the particle size is les...

Embodiment 3

[0041] The method of utilizing lean iron ore of the present invention to prepare direct reduced iron and cementitious material comprises the following steps:

[0042] 1) Take lean iron ore, Al 2 o 3 , anthracite, and a mixture of limestone, lime, calcium carbonate and fluorite in any proportion, dry, crush and grind the lean iron ore and add Al 2 o 3 , anthracite, limestone, lime, calcium carbonate and fluorite in any proportion of the mixture to obtain the furnace raw materials, and then put the furnace raw materials into the furnace after briquetting, and carry out reduction and roasting reactions in a reducing atmosphere;

[0043] 2) The product of the reduction and roasting reaction is taken out of the furnace, and then cooled, crushed and magnetically separated to obtain directly reduced iron and gelling materials.

[0044] In step 1), dry, crush and grind the poor iron until the particle size is less than 300 mesh, and then add Al 2 o 3, anthracite, and a mixture of...

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Abstract

The invention discloses a method for preparing direct reduction iron and gelation materials through low-grade iron ore. The method comprises the following steps: the low-grade iron ore, Al2O3, a reducing agent and a calcium solvent are taken, the low-grade iron ore is dried, broken and ground, then, the Al2O3, the reducing agent and the calcium solvent are added, charging feed stock is obtained, briquetting is carried out on the charging feed stock, then, the charging feed stock is placed in a furnace, and under the reducing atmosphere, a reduction and roasting reaction is carried out; and (2), a product obtained after the reduction and roasting reaction is taken out of the furnace, and then is cooled, broken and magnetically separated, and the direct reduction iron and the gelation materials are obtained. According to the method, the direct reduction iron and the gelation materials can be prepared through the low-grade iron ore, and the method is low in cost, small in energy consumption and convenient to implement.

Description

technical field [0001] The invention relates to a method for preparing direct reduced iron and gelling material, in particular to a method for preparing direct reduced iron and gelling material by utilizing lean iron ore. Background technique [0002] There are more than 2,000 proven iron ore producing areas in China, and the total resource reserves of iron ore reached 84.028 billion tons by the end of 2014. The proven reserves of iron ore resources are mainly concentrated in 10 provinces (autonomous regions) including Liaoning, Hebei, Sichuan, Shanxi, Anhui, Yunnan, Inner Mongolia, Shandong, Hubei and Xinjiang. More than 95% of the iron ore reserves are lean ore, and the average grade is only about 32%. Due to the constraints of the technical level and economic benefits at that time, on the one hand, a large number of ultra-poor off-surface ores and poor miscellaneous ores stripped from most existing iron mines during the mining process were piled up and not used; A large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C04B7/02
Inventor 施瑞盟葛蓓蕾赵俊学李小明唐雯聃崔雅茹刘诗薇饶衍冰
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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