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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  • Summary
  • Abstract
  • 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 beneficiatio

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] Take 200kg of lean limonite powder from Chongzuo, Guangxi (crushed to 100 mesh), mix with 40kg of rice straw crushed to 10 mesh, and then mix with 8 kg of initiator additives (crushed to 80 meshes of firewood), and put the evenly mixed material in the reaction In the furnace, it is roasted at 420°C for 2 hours, and the roasted materials are cooled to below 80°C, and dry magnetic separation is used to obtain 61% iron concentrate with a recovery rate of 72%.

Example Embodiment

[0032] Example 2

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

Example Embodiment

[0034] Example 3

[0035] Take 200kg of limonite powder (pulverized to 100 mesh) in Qujing, Yunnan, and mix with sawdust crushed to 20 mesh and 20 kg and 20 kg corn stover crushed to 20 mesh. Then mix with 4 kg of initiator additive (brown coal crushed to 80 mesh). The uniform material is placed in the 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 65% iron concentrate with 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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