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Iron ore roasting technique

A roasting process and iron ore technology, applied in the field of iron ore roasting process, can solve the problems of Qijiang iron ore not being mined and used, Qijiang iron ore roasting treatment, etc., achieve good roasting effect and reduce roasting cost , the effect of stable quality

Inactive Publication Date: 2008-01-16
CHONGQING IRON & STEEL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that Qijiang iron ore cannot be roasted and processed in the prior art, and Qijiang iron ore cannot be mined and used for a long time, and provides a roasting treatment method, which can effectively mix red (brown) iron ore-siderite Roasting treatment of high-grade iron ore, providing qualified and high-quality roasted ore used in steel plants

Method used

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Experimental program
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Effect test

Embodiment 1

[0037] Embodiment 1, adjust siderite and hematite weight ratio, mix according to the ratio of siderite and hematite weight ratio greater than 1, actual ratio is about 1.1; Weigh -2mm ore 1.2kg, pack into metal container, When the temperature of the resistance furnace rises to the set temperature, put it into the roasting furnace. When the furnace temperature rises to the set temperature, record the roasting time and carry out magnetization roasting. After the set time, take out the container and quickly seal it with water to cool it. After the ore is cooled, grind ore (fineness-0.043mm98.54%) by 50% concentration again, divide the sample, get about 20g small sample and do magnetic separation tube test, check the content of strong magnetic iron minerals in the roasted ore, To test the quality of roasted ore.

[0038] The experimental indicators obtained are as follows:

[0039] Test Index Table (%) Table 1

[0040] temperature(℃)

[0041] Test conclusion: It is feas...

Embodiment 2

[0042] Embodiment 2, (1), take respectively 600 tons of adit samples and 300 tons of Shitan ore samples in a ratio of 2: 1 in the Qijiang Iron Mine Pingdong mining area and Baishitan mining area, a total of 900 tons. The weight ratio of siderite to hematite is about 1.05 to 1.25. After mixing, crushing, and screening to two particle sizes of 75-15mm and 15-0mm, the 75-15mm was put into the furnace for roasting. The iron grade of the ore in the furnace was 41.08%, and the loss on ignition was 21.83%. The ore sample has a good representativeness. Siderite and hematite are mixed, crushed and screened, and processed to two particle sizes of 0-15mm and 15-75mm, and the 15-75mm particle size is put into the roasting furnace. It falls into the heating zone, and enters the cooling zone at the bottom after the decomposition reaction is completed in the heating zone (780°C). It is discharged out of the furnace by the ore discharge roller and the unloading machine and fed into the produc...

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Abstract

The invention discloses an iron ore calcinations process, which comprises (1) detecting and regulating the weight proportions of siderite (FeCO3) and hematite (Fe2O3) in the iron ore, if the content of siderite (FeCO3) in the iron ore is low, the siderite (FeCO3) is added to allow the weight ratio of siderite to hematite is larger than or equal to 0.725; (2) crushing iron ore or a mixture of iron ore and siderite, sieving, and collecting ore particles with a grain size of 10-75mm; and (3) calcining at a temperature ranging from 720 DEG C to 900 DEG C under a negative pressure larger than 100mm water column. The inventive iron ore calcinations process has the advantages that the magnetic roasting of siderite is completed in a neutral atmosphere without using reducers and the CO gas with reducing capacity is released and serves as a reducer for the magnetic roasting of hematite; and the procedure of adding reducer is omitted, so that the consumption of reducer such as powdered coal is reduced and the calcinations cost is saved. The invention can better utilize the siderite (limonite)-siderite mixed iron ore, provide a basis for developing the iron ore in Qijiang technically and theoretically.

Description

technical field [0001] The invention relates to a roasting process method of iron ore, in particular to a roasting process method of red (brown) iron ore-siderite mixed type iron ore. Background technique [0002] In Qijiang County, Chongqing City, a red (brown) iron ore-siderite mixed iron ore (called Qijiang iron ore in this article) is stored, which was once supplied to Chongqing Iron and Steel (Group) Co., Ltd. Qijiang iron ore is an acidic high-silicon and low-sulfur phosphorus-containing iron ore. The natural type of the ore is red (brown) iron ore-siderite mixed ore; the occurrence state of iron in the ore is complex, and various minerals are symbiotic. It is famous all over the world for its extremely fine particle size, difficulty in dissociation of monomers and difficulty in dehydration of iron concentrate. In order to develop and utilize this part of resources, Chongqing Iron and Steel Group invested a total of more than 1 million yuan in test funds from the earl...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B1/14
Inventor 舒西刚赖维远康健邓彬魏红琼
Owner CHONGQING IRON & STEEL (GRP) CO LTD
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