Process for extracting iron concentrate by sulfuric slag flotation

A process method and sulfuric acid slag technology, applied in the field of flotation process, can solve the problems of loss of economy, difficulty in fully meeting the quality requirements of iron concentrates, and low recovery rate, and achieve obvious resource utilization, high recovery rate, and land reduction. Effect

Inactive Publication Date: 2005-03-02
杨慧芬 +1
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  • Application Information

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Problems solved by technology

However, due to the inherent defects of the method itself, it is difficult for the obtained iron concentrate to fully meet the quality requirements of ironmaking for the iron concentrate to contain more than 60% iron
Although some methods can obtain iron concentrates containing more than 60% iron, the low recovery rate makes the application of this method lose its due economy

Method used

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  • Process for extracting iron concentrate by sulfuric slag flotation

Examples

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Effect test

Embodiment 1

[0014] 500 g of sulfuric acid slag with an iron grade of 49% is selectively ground in a rod mill with a grinding concentration of 20%, and the obtained grinding product has a particle size of -200 mesh of 70%. Add acidified water glass 1kg / t to the flotation machine and stir for 10 minutes, then add fatty acid collector 1.3kg / t and stir for 8 minutes to keep the flotation concentration at 50%, and finally add alcohol foaming agent 50g / t Stirring for 2 minutes, flotation for 7 minutes to obtain flotation rough concentrate. The rough concentrate is subjected to three times of beneficiation to obtain qualified iron concentrate. The three selected tailings are combined, and the iron concentrate and tailings are obtained by separate screening. The scavenging concentrate was combined with the concentrate III concentrate to obtain a final iron concentrate grade of 60.78%, a recovery rate of 74.84%, and a yield of 62.02%. The flotation tailings contain 19.91% iron and can be used as...

Embodiment 2

[0016] 500g of sulfuric acid slag with an iron grade of 48.2% is selectively ground in a rod mill with a grinding concentration of 50%, and the obtained grinding product has a particle size of -200 mesh of 86%. Add acidified water glass 1.6kg / t to the flotation machine and stir for 10 minutes, then add sulfonic acid collector 3kg / t and stir for 8 minutes to keep the flotation concentration at 30%, and finally add 50g of alcohol foaming agent / t Stirring for 2 minutes, flotation for 7 minutes to obtain flotation rough concentrate. The rough concentrate is subjected to three times of beneficiation to obtain qualified iron concentrate. The three selected tailings are combined, and the iron concentrate and tailings are obtained by separate screening. The scavenging concentrate is combined with the concentrate III concentrate to obtain a final iron concentrate grade of 61.52%, a recovery rate of 72.5%, and a yield of 60.3%. The flotation tailings contain 17.32% iron and can be us...

Embodiment 3

[0018] 500g of sulfuric acid slag with an iron grade of 49.3% is ground in a ball mill with a grinding concentration of 80%, and the obtained grinding product has a particle size of -200 mesh of 95%. Add acidified water glass 10kg / t to the flotation machine and stir for 10 minutes, then add sulfonic acid collector 5kg / t and stir for 8 minutes to keep the flotation concentration at 20%, and finally add alcohol foaming agent 50g / t Stirring for 2 minutes and flotation for 4 minutes to obtain flotation rough concentrate. The rough concentrate is subjected to three times of beneficiation to obtain qualified iron concentrate. The three selected tailings are combined, and the iron concentrate and tailings are obtained by separate screening. The scavenging concentrate was combined with the concentrate III concentrate to obtain a final iron concentrate grade of 60.92%, a recovery rate of 70.55%, and a yield of 58.3%. The flotation tailings contain 23.72% iron and can be used as cemen...

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Abstract

There are many kinds of technological process of extracting sulfuric slag to obtain iron concentrate, and the present invention is one technological process comprising milling sulfuric slag, controlled dispersion and floatation. Compared with other technological processes, the present invention has the advantages of high grade of obtained iron concentrate, high yield, etc. For example, the said technological process can extract sulfuric slag with iron content less than 50 % to obtain iron concentrate with iron content over 60 % and in the iron recovering rate over 70 %. The said technological process is simple, uses conventional apparatus and is easy to use in industrial production.

Description

technical field [0001] The invention relates to a flotation process, in particular to a process for extracting iron concentrate from sulfuric acid slag. Background technique [0002] During the sulfuric acid production process, the sulfur in the pyrite has been extracted and utilized, and the iron and other elements are transferred into the sulfuric acid slag. Generally, the iron content of sulfuric acid slag is directly affected by the pyrite content of raw materials for production. The higher the sulfur content, the higher the pyrite content in the raw material, so the higher the iron content of the obtained sulfuric acid slag. Foreign sulfuric acid production generally uses high-grade sulfur-containing ore with a sulfur content of 40% to 50%. Therefore, the obtained sulfuric acid slag contains more than 60% iron and can be directly used as raw material for ironmaking without any treatment. However, low-grade sulfur-containing ores are generally used in China, and some s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00B03D1/002
Inventor 杨慧芬王智凡
Owner 杨慧芬
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