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Mineral processing technology for reducing, roasting, iron extraction and impurity removal of limonite

A limonite and roasting technology, applied in the directions of magnetic separation, solid separation, chemical instruments and methods, etc., can solve the problems of low iron grade in concentrate, complicated beneficiation process and many operating conditions, etc. The effect of high chemical rate and reduced grinding amount

Active Publication Date: 2014-02-05
中冶北方(大连)工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to make use of Indonesian limonite resources, solve the problems of complex beneficiation process of limonite in current production, many operating conditions, difficulty in sorting, low iron grade in concentrate, and high production cost, and alleviate the contradictions in resource utilization

Method used

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  • Mineral processing technology for reducing, roasting, iron extraction and impurity removal of limonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The main chemical composition of the Indonesian limonite processed by the present invention is: TFe 42.0%, the raw material ratio of the agglomeration mixture: Indonesian limonite 92.0%, coal powder 5.0%, binder cassava starch 1%, additive 2.0% , The additive is a mixture of calcium oxide, sodium carbonate and sodium sulfate, the weight percentage of calcium oxide, sodium carbonate and sodium sulfate is 30%: 30%: 40%. After crushing, mix and agglomerate, put it into the dryer, dry at 250°C for 7 minutes, and then put the dried material into the tunnel kiln for reduction and roasting, the roasting temperature is 1000°C, and the high-temperature roasting time is 6 hours. After roasting, the product is quenched and cooled in water, and sieved. The diameter of the sieve hole is 10 mm. The product under the sieve is wet pre-selected, and the product on the sieve is crushed by a crusher to a size below 10 mm. % of the tailings, the concentrate pre-selected by the wet pre-sele...

Embodiment 2

[0032] The main chemical composition of the Indonesian limonite processed by the present invention is: TFe 45.0%, the raw material ratio of the block mixture: Indonesian limonite 81.0%, coal powder 13.0%, binder cassava starch 4%, additive 2.0% , the additive is a mixture of calcium oxide, sodium carbonate and sodium sulfate, the weight percentage of calcium oxide, sodium carbonate and sodium sulfate is 30%: 30%: 40%). After crushing, mix and make agglomerates, put it into the dryer, dry at 300°C for 6 minutes, and then reduce the dried material to roasting at 1100°C, high-temperature roasting time for 5 hours, and reduce roasting After the end, water quenching and cooling, and then sieving, the sieve diameter of the wet pre-screening screen is 10 mm, the product under the screen is crushed to less than 10 mm by the crusher, and the wet pre-screening yield is 20.45%. , Qualified tailings with an iron grade of 7.88%, feed the concentrate pre-selected by the wet pre-separation m...

Embodiment 3

[0034]The main chemical composition of the Indonesian limonite processed by the present invention is: TFe 50.0%, the raw material ratio of the agglomerate mixture: 90.0% of Indonesian high-alumina limonite, 7.0% of coal powder, 2.0% of adhesive cassava starch, adding Binder 1.0%, the additive is a mixture of calcium oxide, sodium carbonate and sodium sulfate, its calcium oxide, sodium carbonate, sodium sulfate weight percentage is 30%: 30%: 40%, mixed after crushing, agglomeration , put it into the dryer, dry at 380°C for 5 minutes, and then roast the dried material at a temperature of 900°C for 6 hours at a high temperature. The sieve hole diameter of the pre-screening screen is 10 mm. The product under the screen is crushed by the crusher to less than 10 mm. The wet pre-screening, the wet pre-selection discards the qualified tailings with a yield of 16.45% and an iron grade of 8.18%. The concentrate pre-selected by the concentrator is fed into the ball mill for a stage of we...

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PUM

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Abstract

The invention relates to a mineral processing technology for reducing, roasting, iron extraction and impurity removal of limonite. The mineral processing technology is characterized by comprising the steps: raw material preparation, agglomeration, drying treatment, reduction roasting, water quenching of roasted materials, screening wet preconcentration, stage grinding and magnetic separation. With the adoption of the mineral processing technology for reducing, roasting, iron extraction and impurity removal of limonite, the metallization ratio is 90-95 percent, the recovery ratio of iron reaches 90-95 percent, and tailings with the grade of 5-10 percent is final tailings.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a limonite reduction roasting process for iron extraction, impurity removal and ore dressing. Background technique [0002] Limonite, especially Indonesian limonite, is a hydrous oxidized ore, which is formed by the weathering of other ores. It is the most widely distributed in nature, but it is rare to see large deposits. Limonite is actually made of goethite (Fe 2 o 3 ·H 2 O), goethite (2 Fe 2 o 3 ·H 2 O) and a mixture of iron oxides and argillaceous substances containing different water of crystallization. Most of the iron-bearing minerals in limonite are 2Fe 2 o 3 ·H 2 O form exists. Generally, the iron content of limonite ore is 37% to 55%, and sometimes the phosphorus content is higher. Limonite has strong water absorption and generally absorbs a large amount of water. After roasting or heating in a blast furnace, free water and crystal wat...

Claims

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Application Information

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IPC IPC(8): B03C1/02B03C1/005C22B1/02
Inventor 孟光栋闫文光韩卫涛陈江华汪明月
Owner 中冶北方(大连)工程技术有限公司
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