Method for reinforcing preparation and reduction of carbon-containing pellets in iron ore

A technology of internal carbon and iron ore, which is applied in the field of metallurgical technology and comprehensive utilization of mineral resources, can solve the problems of complex preparation process, low direct reduction efficiency, and short treatment process of high-quality internal carbon pellets, and achieve enhanced subsequent reduction Effect, good product quality, short processing process

Inactive Publication Date: 2017-04-26
CENT SOUTH UNIV
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Problems solved by technology

[0004] In view of the existing coal-based direct reduction efficiency is low, it is difficult to go smoothly, and the preparation process of high-quality internal carbon pellets is complicated and difficult, and a method for strengthening the preparation and reduction of iron ore internal carbon pellets is dev

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  • Method for reinforcing preparation and reduction of carbon-containing pellets in iron ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The 1# iron ore was mixed with coal particles prepared according to the mass ratio of C / Fe of 0.3, NaCl prepared according to 3.0% of the total mass of iron ore dry basis and bentonite prepared according to 1.0% of the total mass of iron ore dry basis. Batching; the mixed material after batching is sent to the ball mill together for crushing, grinding and mixing to obtain a mixed material with a particle size of less than 0.074mm accounting for 80% of the mass percentage; the mixed material is pelletized by a disc pelletizer to obtain Internal carbon pellets with a diameter of about 6mm; after drying the internal carbon pellets (the obtained dry pellets are dropped from a height of 0.5m, after repeating 3 times, the mass fraction of powder with a particle size less than or equal to 1.0mm is 1.6%) Enter the rotary kiln, reduce and roast at 1000°C for 0.5 hours, and obtain reduced pellets with a metallization rate of 82.5%, and the rotary kiln can achieve stable forward mo...

Embodiment 2

[0048] The 2# iron ore is mixed with the coal particles according to the C / Fe mass ratio of 0.2, and the Na 2 CO 3 Carry out batching; the mixed material after batching is sent to the ball mill for crushing, grinding and mixing to obtain a mixed material with a particle size of less than 0.074mm accounting for 70% of the mass percentage; the mixed material is pelletized by a disc pelletizer, Obtain the internal carbon pellets with a diameter of about 8mm; the internal carbon pellets are dried (gained dry balls fall from a height of 0.5m, after repeating 3 times, the mass fraction of powder with a particle size less than or equal to 1.0mm is 2.0% ) enters the rotary kiln, and is reduced and roasted at 800° C. for 4 hours to obtain reduced pellets with a metallization rate of 51.2%, and the rotary kiln can achieve stable forward movement.

Embodiment 3

[0050] The 2# iron ore was mixed with coal particles prepared according to the mass ratio of C / Fe of 0.2, NaCl prepared according to 5.0% of the total mass of dry basis of iron ore and bentonite prepared according to 2.0% of the total mass of dry basis of iron ore. Batching; the mixed material after batching is sent to the ball mill together for crushing, grinding and mixing to obtain a mixed material with a particle size of less than 0.074mm accounting for 85% of the mass percentage; the mixed material is pelletized by a disc pelletizer to obtain Internal carbon pellets with a diameter of about 12mm; after drying the internal carbon pellets (the obtained dry pellets are dropped from a height of 0.5m, after repeating 3 times, the mass fraction of powder with a particle size less than or equal to 1.0mm is 3.2%) Enter the rotary kiln, reduce and roast at 900°C for 2 hours, and obtain reduced pellets with a metallization rate of 64.3%, and the rotary kiln can achieve stable forwar...

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Abstract

The invention relates to a method for reinforcing preparation and reduction of carbon-containing pellets in iron ore. The method for reinforcing preparation and reduction of the carbon-containing pellets in the iron ore comprises the following steps that (1) the iron ore, a reducing agent, a bonding agent and an additive are prepared according to a certain proportion; (2) prepared mixtures are sent into a ball mill to be crushed, fine ground, evenly mixed and the like, so that fine-sized evenly-mixed materials are obtained; (3) pelletizing or briquetting is conducted by means of the fine-sized evenly-mixed materials, so that the carbon-containing pellets in the iron ore are obtained; and (4) the prepared carbon-containing pellets in the iron ore are subjected to reducing roasting treatment, and thus metallized pellet products can be obtained. According to the method for reinforcing preparation and reduction of the carbon-containing pellets in the iron ore, in the way that the raw materials including the iron ore, the reducing agent, the bonding agent, the additive and the like enter the mill simultaneously after being prepared, the dual effects of fine grinding and sufficient and even mixing of the raw materials are achieved at the same time in the single ore grinding procedure, and the procedure links of fine grinding raw materials separately in advance, then preparing the raw materials in proportion and finally conducting even mixing of traditional operation are greatly simplified; and the quality of the carbon-containing pellets in the iron ore is remarkably improved, and the subsequent reduction process is reinforced.

Description

technical field [0001] The invention relates to the field of metallurgical technology and comprehensive utilization of mineral resources, in particular to a method for strengthening the preparation and reduction of carbon pellets in iron ore. Background technique [0002] With the development of the iron and steel industry, the problem of insufficient supply of high-quality iron ore in my country has become increasingly serious. Mineral resources have become the "bottleneck" of the development of China's iron and steel industry. The demand for iron ore in China has increased sharply. Since 2009, China has imported iron ore The average annual growth rate is 21.8%, and the continuous increase in import volume also makes China's iron ore import dependence continue to increase. In 2012, China's iron ore import dependence was about 63%. In 2014, the foreign import dependence rose again to 78.5%. At the same time, the huge pressure on coke resources seriously restricts the developm...

Claims

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Application Information

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IPC IPC(8): C22B1/245
CPCC22B1/245
Inventor 易凌云黄柱成姜涛郭宇峰李光辉杨永斌范晓慧张元波钟荣海梁之凯
Owner CENT SOUTH UNIV
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