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Coal gasification-pore iron ore magnetic roasting coupling technique and device

A technology of coal gasification and magnetization roasting, applied in the fields of metallurgy and chemical industry, can solve problems such as S pollution, and achieve the effect of avoiding pollution, avoiding insufficient reduction, and avoiding some excessive reduction problems.

Active Publication Date: 2010-05-12
深圳市中科九台资源利用科技产业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Another object of the present invention is to provide a method for removing sulfur in the coal direct reduction iron ore process, to solve H 2 S pollution problem

Method used

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  • Coal gasification-pore iron ore magnetic roasting coupling technique and device
  • Coal gasification-pore iron ore magnetic roasting coupling technique and device
  • Coal gasification-pore iron ore magnetic roasting coupling technique and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: select Henan Lingbao iron ore, raw ore iron grade 46%, iron ore is ground to 80% less than 71 μ m (200 orders); Select Shanxi lignite for use, sulfur content 1wt%, iron ore powder and coal ratio are 15:1; choose CaO as the desulfurizer, the CaO:coal ratio is 1:40, and the coal gasification temperature is 1000°C. The reduction temperature of the iron ore is controlled at 850°C, and the average residence time of the reaction is controlled at 1 minute. The iron ore obtained by roasting is magnetically separated under a 0.9T magnetic field, and the iron concentrate grade can be 60-65%, the yield is 50-58%, the recovery rate is 85-88%, and the iron grade of the tailings is 8-13%. good indicator.

Embodiment 2

[0034] Embodiment 2: select Jiuquan iron ore, raw ore grade iron 38.8%, iron ore is ground to 80% less than 71 μ m; select Shanxi lignite, sulfur content 1wt%, iron ore powder and coal ratio are 10: 1, select CaO As a desulfurizer, the CaO:coal ratio is 1:40, and the coal gasification temperature is 900°C. The iron ore reduction temperature is controlled at 550°C, and the average residence time of the reaction is controlled at 25 minutes. The iron ore obtained by roasting is magnetically separated under a 0.9T magnetic field, and the grade of iron concentrate can be 62%, the recovery rate is 93%, the metal recovery rate is 86%, and the iron grade of tailings is 7.5%.

Embodiment 3

[0035] Embodiment 3: select Anshan hematite, raw ore grade iron 22%, iron ore is ground to 80% less than 71 μ m; select Shanxi lignite, sulfur content 1wt%, iron ore powder and coal ratio are 10: 1, select CaO As a desulfurizer, the CaO:coal ratio is 1:40, and the coal gasification temperature is 900°C. The iron ore reduction temperature is controlled at 700°C, and the average residence time of the reaction is controlled at 10 minutes. The iron ore obtained by roasting is magnetically separated under a 0.9T magnetic field, and the grade of the iron concentrate is greater than 60%, and the iron recovery rate is more than 85%.

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Abstract

The invention relates to the chemical industry and metallurgy field, in particular to coal gasification - lean iron ore magnetizing roasting coupling technique and a coal gasification - lean iron oremagnetizing roasting coupling device. The invention is characterized in that: gasification reaction of coal and reduction action of iron ores are respectively performed in independent reaction chambers, and coal gasification and iron ore reduction are guaranteed to be able to be performed under independent optimal conditions; simultaneously, a coal gasification chamber and an iron ore reduction chamber are also coupled with each other to form a reaction device; the coal gasification is performed in the gasification chamber on the lower part of the reaction device, and reducing gas obtained after gasification enters into a roasting chamber for reducing roasting reaction together with powdery refractory lean iron ores; three to six abnormal tube sinkings are arranged inside a lean iron ore roasting chamber which is divided into four to seven levels of fluidized beds; residence time distribution of lean iron ore particles is guaranteed to be close to plug flow. The invention has the advantages of simple technique, capability of respectively optimizing the gasification reaction of the coal and magnetizing roasting reaction of lean iron ores in one reaction device, even residence time distribution in the lean iron ore particles of the roasting chamber, capability of improving roasting and magnetic separation efficiency, and obtaining of good grade of iron concentrate and iron recovery rate.

Description

technical field [0001] The invention relates to a coal gasification-lean iron ore magnetization roasting coupling process and device, belonging to the fields of chemical industry and metallurgy. Background technique [0002] The iron and steel industry is a pillar industry of the national economy, supporting many important industries such as automobiles, construction, transportation, and electromechanical. With the rapid development of my country's economy, the demand for iron ore has risen sharply. The current domestic iron ore output has been difficult to meet the production demand, and a large amount of iron ore needs to be imported every year (for example, in 2005, my country imported about 2.7 million tons). In recent years, the price of international iron ore has risen sharply, and the international situation of iron ore imports is not optimistic, which has endangered the safety of my country's iron ore supply. [0003] By the end of 2002, the national iron ore reserv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02F27B19/04
Inventor 朱庆山李洪钟李佑楚姚建中卢旭晨郝志刚张会刚
Owner 深圳市中科九台资源利用科技产业股份有限公司
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