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Technique and system for preparing fine iron powder from low-grade limonite by wet process

A technology of refined iron powder and limonite, which is applied in the field of comprehensive utilization of ferrous metal resources, can solve the problems that hydrometallurgy with low added value of products is difficult to play a role, etc.

Inactive Publication Date: 2015-03-04
新疆蓝天镁业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the mature and stable technology of the iron and steel industry, but also due to the low added value of the products in the iron and steel industry and the inability to treat wastes formed by other anions and cations in the wet treatment process, it is difficult for hydrometallurgy to play a role in iron ore treatment.

Method used

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  • Technique and system for preparing fine iron powder from low-grade limonite by wet process
  • Technique and system for preparing fine iron powder from low-grade limonite by wet process
  • Technique and system for preparing fine iron powder from low-grade limonite by wet process

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Experimental program
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Effect test

Embodiment 1

[0035] The sample comes from limonite in Shanshan County, Xinjiang, and its content is:

[0036] Single element Fe Al Ca Mg Si

[0037] Content (%) 35.97 1.641 3.22 1.17 14.41

[0038] In the embodiment, 1000 kg of limonite is ground into ore powder of 100 mesh or more with a ball mill, then enters an acid leaching tank, and then adds an excess of 20% hydrochloric acid according to the theoretical ratio, the concentration of concentrated hydrochloric acid is 31%, 45 ° C, 2.35 m3, the reaction Automatic heat generation, the system reaction temperature is about 80 ℃, leaching reaction for 2 hours. After the reaction is over, pump it into a plate-and-frame filter press for pressure filtration. The filtered solution is analyzed, and the filter cake enters the slurry tank. Among them, the results of acid leaching are: solution volume is 1.985 m3; color: reddish brown; slag weight (dry): 366 kg. The analysis is as follows: in the liquid phase: Fe=173.5 g / L; Ca=9.80g / L; Mg=4.07g / L...

Embodiment 2

[0043] The solution enters the pre-concentrator for concentration, wherein the temperature of the flue gas after the hydrolysis is 400°C, and the gas content (mass fraction %) is: HCl, 18.3%; H 2 O, 20.8%; N2, 44.7%; CO 2 , 14.8%. After contact, the volume of the solution shrinks by 20%, and the concentration is 1.2 times of the original. The gas content (mass fraction%) after contact is: HCl, 17.0%; H 2 O, 30.0%; N2, 39.0%. The solution enters the roasting furnace for high-temperature roasting, and the gas generator is a first-stage gas generator, which generates hot dirty gas at 450°C. The bottom of the hydrolysis roasting furnace is 750°C, and the top of the furnace is 400°C. The content of the fine iron powder after the reaction is:

[0044] Single element Fe Al Ca Mg

[0045] Content (%) 67.8 1.46 4.56 1.20

[0046] Wherein the one-time recovery rate of iron is 93%.

Embodiment 3

[0048] The temperature of the pre-concentrated gas material is reduced to 97°C, and then enters the first-stage condenser, the temperature of the first-stage condenser is 70°C, the temperature of the cooling water is 35°C, and the HCl content (mass fraction) in the obtained solution is 26.4%; Enter the secondary condenser, the temperature of the secondary condenser is 55°C, the temperature of the cooling water is 35°C, and the HCl content (mass fraction) in the obtained solution is 28.7%; enter the third-stage condenser, the temperature of the third-stage condenser is 40°C, the cooling water temperature is 35°C, and the HCl content (mass fraction) in the obtained solution is 31.1%.

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Abstract

The invention provides a technique and system for preparing fine iron powder from low-grade limonite by a wet process. The technique comprises steps as follows: limonite is subjected to ball milling to obtain an acid leaching raw material; recycled hydrochloric acid and the prepared powder enter an acid leaching system to be subjected to acid leaching; the product subjected to acid leaching is filtered, the filter cake is subjected to pulping washing, the acid leaching solution enters a preconcentrator to contact high-temperature fume after hydrolysis, and the solution is concentrated and enters a hydrolysis system to be subjected to high temperature hydrolysis; the generated powder and the material recovered by cyclone dust removal are collected as a fine iron powder product; the gas enters the preconcentrator to be cooled, and is subjected to primary, secondary and tertiary condensation; the condensed liquids are mixed and enter an absorption tower to be absorbed; and the gas enters the absorption tower to be subjected to hydrochloric acid absorption until the hydrochloric acid concentration finally reaches 31%. The invention also provides a system for implementing the technique. Only a hydrochloric acid recycling process exists in the whole technical process, and thus, the technique is environment-friendly and clean.

Description

technical field [0001] The invention relates to a process and system for preparing fine iron powder by wet method of low-grade limonite, which belongs to the field of comprehensive utilization of ferrous metal resources. Background technique [0002] Limonite is the oxide and hydroxide of amorphous iron, with goethite (-FeO(OH)), water goethite (-FeO(OH) nH 2 O) mainly, with colloidal, kidney-like, stalactite-like output, amorphous or aphanitic, often developed in hematite-goethite fissures and geodes. Because limonite has special characteristics such as unstable chemical composition, low iron content, large changes in moisture content, and easy muddying in the grinding process, it is extremely difficult to separate iron ore, and the proven limonite in my country has reached 12.3 There are a large number of limonite iron ore resources in China, but they have to rely on a large amount of imported iron ore because they cannot be effectively utilized. [0003] Limonite benefic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/00C22B3/10C22B3/22C22B3/44
CPCY02P10/20
Inventor 王云山戴群
Owner 新疆蓝天镁业股份有限公司
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