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Method for producing iron ore concentrate by magnetizing and reducing limonite through biomass

A biomass raw material, limonite technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of iron ore concentrate grade difficult to reach 60%, high metal recovery rate, difficult to obtain, etc. Achieve the effect of facilitating equipment fabrication and maintenance, saving investment, and preventing sticking problems

Inactive Publication Date: 2011-07-27
TSINGHUA UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because limonite is rich in crystal water, it is difficult to achieve 60% iron ore concentrate grade by physical beneficiation method
Limonite is very easy to muddy during the grinding process, and it is difficult to obtain a high metal recovery rate

Method used

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  • Method for producing iron ore concentrate by magnetizing and reducing limonite through biomass

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Take 200kg of poor limonite powder in Chongzuo, Guangxi (crushed to 100 mesh) and mix with 40kg of rice straw crushed to 10 mesh, and then mix evenly with 8kg of initiator additive (firewood and coal crushed to 80 mesh), and place the uniformly mixed material in the reaction In the furnace, roast at 420°C for 2 hours, cool the roasted material to below 80°C, and adopt dry magnetic separation to obtain iron concentrate with a grade of 61% and a recovery rate of 72%.

Embodiment 2

[0033] Take 200kg of lean brown ore powder in Chongzuo, Guangxi (crushed to 100 mesh), mix with 20kg of wheat straw crushed to 10 mesh and 20kg of corn stalks crushed to 10 mesh, and then mix evenly with 4kg of initiator additive (coal gangue crushed to 80 mesh), and mix well The raw material was placed in a reaction furnace and roasted at 550°C for 1 hour. The roasted raw material was cooled to below 80°C, and dry magnetic separation was used to obtain iron concentrate with a grade of 62% and a recovery rate of 75%.

Embodiment 3

[0035] Get Yunnan Qujing limonite powder 200kg (crushed to 100 mesh) and be crushed to 20 mesh 20kg sawdust and crush to 20 mesh 20kg corn stalks and mix, then mix with 4kg initiation additive (brown coal crushed to 80 mesh), mix The uniform material is placed in a reaction furnace and roasted at 500°C for 1 hour. The roasted material is cooled to below 80°C and wet magnetic separation is used to obtain iron concentrate with a grade of 65% and a recovery rate of 85%.

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Abstract

The invention discloses a method for producing iron ore concentrate by magnetizing and reducing limonite through biomass, and belongs to the technical field of production of iron ore concentrate from low-grade limonite. The method comprises the following steps of: weighing raw materials of low-grade limonite, biomass raw material powder and an initiating additive in a weight ratio of 100:(10-30):(0.5-4), and uniformly mixing; and roasting the mixed material at the temperature of between 400 and 600DEG C, and performing dry-process or wet-process magnetic separation on roasting sand to obtain the iron ore concentrate. In the method for preparing fine iron powder by magnetizing and reducing lean iron ore through biomass, renewable energy of biomass replaces coal to reduce and magnetize the lean iron ore, the lean iron ore resources widely distributed in China can be utilized, the reduction temperature can be reduced to below 600 DEG C when the biomass is adopted for reduction, the problem of caking of silicate in the reduction process is prevented, equipment manufacture and maintenance are facilitated, the investment is saved, and the aims of saving energy and reducing production cost are fulfilled.

Description

technical field [0001] The invention belongs to the technical field of producing iron ore concentrate from low-grade limonite, in particular to a method for producing iron ore concentrate through the magnetization reduction of limonite by biomass. Background technique [0002] Iron and steel is an important basic industry of my country's national economy and an important supporting industry to promote industrialization. In recent years, my country's steel output has maintained an average annual growth rate of around 20%. In 2008, the national crude steel output was 3.7 times that of 2000, accounting for 37.7% of the global crude steel output (1.33 billion tons). Although affected by the financial crisis in 2008, my country's steel output still reached 502 million tons, which has been 12 consecutive years. It ranks first in the world and is the sum of the steel output of Japan, the United States and Russia, which ranks No. 2 to No. 4. my country is already the world's larges...

Claims

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Application Information

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IPC IPC(8): C22B1/02B03C1/00B03C1/015
Inventor 朱国才李云波李学军谭周时
Owner TSINGHUA UNIV
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