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Method for preparing reductive iron powder and high-purity refined iron powder by using iron ores

A technology for reducing iron powder and iron ore, applied in the field of mineral processing, can solve the problems of not wide application range, increased operation difficulty, long production cycle, etc., and achieve the effects of wide application range, stable product quality and simple process

Inactive Publication Date: 2011-12-14
昆明晶石矿冶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The scope of adaptation is not too wide
[0007] (2) The product obtained is relatively simple
[0008] (3) There are many types of additives, and the actual operation is more difficult
[0009] (4) The production cycle is relatively long

Method used

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  • Method for preparing reductive iron powder and high-purity refined iron powder by using iron ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The ore samples come from the Huimin area of ​​Yunnan, and the iron content of the raw ore is 42-48%, which belongs to weathered fine-grained red limonite. Crush the ore until the particle size is less than 20mm, then put it into the drying equipment for drying, the drying temperature is 400°C, and the external moisture is controlled to be less than 5%; the dried sample is dry ground to -100 mesh powder by Raymond mill Like sample, add dry ore mass fraction 30% CaCl 2 , 15% coke (grain size -1mm), mix with the powder sample, use the pelletizer to pellet the mixed sample to -20+10mm pellets, put the pellets into the drying equipment , dried until the external moisture is less than 5%, the drying temperature is 400°C, the dried pellet sample is transported to the roaster for chlorination reduction roasting, the roasting temperature is 1000°C, the roasting time is 60min, and the grinding fineness is - 0.038mm accounts for 95%, and then carry out two stages of magnetic sep...

Embodiment 2

[0036] The ore sample comes from a certain area in Sichuan. The raw ore contains 32-43% iron. The ore composition is relatively complex, and the embedded particle size is quite fine. Crush the ore until the particle size is less than 20mm, then put it into the drying equipment for drying, the drying temperature is 400°C, and the external moisture is controlled to be less than 5%; the dried sample is dry ground to -100 mesh powder by Raymond mill Like sample, add 40% CaCl in mass fraction of dry ore 2 , 25% coke (grain size -1mm), mix with the powdery sample, use a pelletizer to pellet the mixed sample to -20+10mm pellets, put the pellets into the drying equipment , dried until the external moisture is less than 5%, the drying temperature is 400°C, the dried pellet sample is transported to the roaster for segregation roasting, the roasting temperature is 950°C, the roasting time is 90min, and the grinding fineness is -0.038mm Accounting for 95%, the magnetic field strength of ...

Embodiment 3

[0040]The ore samples come from a certain area in Guangxi, and the raw ore contains about 48-53% iron, which is a typical limonite ore. Crush the ore until the particle size is less than 20mm, then put it into the drying equipment for drying, the drying temperature is 400°C, and the external moisture is controlled to be less than 5%; the dried sample is dry ground to -100 mesh powder by Raymond mill Like sample, add 10% CaCl in mass fraction of dry ore 2 , 10% coke (grain size -1mm), mix with the powdery sample, use a pelletizer to pellet the mixed sample to -20+10mm pellets, put the pellets into the drying equipment , dried until the external moisture is less than 5%, the drying temperature is 400°C, the dried pellet samples are transported to the roaster for segregation roasting, the roasting temperature is 1100°C, the roasting time is 45min, and the grinding fineness is -0.038mm Accounting for 95%, the magnetic field strength of the first section of magnetic separation H ...

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Abstract

The invention discloses a method for preparing reductive iron powder and high-purity refined iron powder by using iron ores. The method comprises the following steps of: ore crushing, dry grinding for preparing powder, reducing agent preparation, uniform mixing of pellet materials, pellet preparation, pellet roasting, water quenching, grinding and classification, magnetic separation, product dehydration and drying and the like so as to obtain the high-purity refined iron powder. The method has the advantages of simple process, wide application range and strong operability; the products are diversified, and the reductive iron powder and the high-purity refined iron powder can be obtained; the waste gas is reclaimed for recycling, the tailings are used as raw materials for slag cement and the tail water is used in a closed cycle mode, so the method belongs to an environment-friendly process; and the products have stable quality. The method is particularly adaptive to chlorination and reduction of the iron ores with characteristics of thin disseminated grain size, complex ore composition, high impurity (sulfur, phosphorus, arsenic and silicon) content and the like.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a method for preparing reduced iron powder and high-purity iron fine powder by iron ore chlorination reduction-fine grinding magnetic separation. Background technique [0002] With the rapid development of my country's iron and steel industry, the demand for iron ore shows an increasing trend. my country's iron ore generally has the characteristics of low iron content, high impurity content, complex ore composition, and fine particle size of ore embedding. It is difficult to obtain ideal iron concentrate for this type of refractory iron ore by traditional beneficiation methods. Single, it is difficult to meet the needs of different iron and steel smelters and related enterprises. [0003] At present, the beneficiation of iron ore mainly includes magnetic separation process, gravity separation process, magnetization roasting process, and direct reduction process. Due to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F9/20
Inventor 肖军辉张昱
Owner 昆明晶石矿冶有限公司
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