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A method for removing iron in the process of extracting aluminum from coal gangue

A technology for removing iron from coal gangue and magnetic separation, applied in chemical instruments and methods, iron halide, magnetic separation, etc. The effect of reducing the content and increasing the contact area

Active Publication Date: 2014-10-22
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for removing iron in the process of extracting aluminum from coal gangue in view of the problems that the iron content in gangue is high and the conventional magnetic separation method cannot meet the requirements of the aluminum extraction process

Method used

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  • A method for removing iron in the process of extracting aluminum from coal gangue

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Experimental program
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Effect test

Embodiment 1

[0018] A horizontal fluidized magnetic separation device, such as figure 1 Shown: including magnetic separation bin 9, feed inlet 1, blower 2, air branch pipe 3, gas distribution plate 4, discharge outlet 5, exhaust outlet 8, dust collector 7, induced draft fan 6, electromagnet 10, blowing pipe 11; the inner bottom of the magnetic separation chamber 9 is provided with a gas distribution plate 4 at 10° to the horizontal direction, and the feed inlet 1 is on the side wall of the magnetic separation chamber 9 on the higher side of the gas distribution plate 4, and is connected with the horizontal blowing pipe 11 Connected, the discharge port 5 is located on the other side wall of the magnetic separation bin 9, and the position of the discharge port 5 is consistent with the height of the lower side of the gas distribution plate 4 to ensure smooth discharge; the magnetic separation bin 9 Five electromagnets 10 are arranged on the inner top, and a row of air branch pipes 3 are arran...

Embodiment 2

[0021] The coal gangue with an alumina content of 25.9%, an iron oxide content of 2.4%, and a carbon content of 21% was crushed and ground to below 60 mesh, and the material was placed in the horizontal fluidized magnetic separation device of Example 1 for magnetic separation for 5 minutes. After magnetic separation, the content of iron oxide in the material was reduced to 1.30%, the content of aluminum oxide was 26%, and the removal rate of iron oxide was 51.25%. After calcination and activation at 750°C for 2 hours, the content of aluminum oxide in the material was 31.14%, and the content of iron oxide was 1.65%; the material after magnetic separation is iron-removed under the following acid leaching conditions: the concentration of hydrochloric acid is 12mol / L (mass fraction is 36%), the solid-liquid ratio is 1:3, acid leaching at 40°C for 40min, this step of acid leaching The iron oxide removal rate of the process is 48%; the total iron oxide removal rate of the two-step ir...

Embodiment 3

[0023] The coal gangue with an alumina content of 21.18%, an iron oxide content of 2.53%, and a carbon content of 25% was crushed and ground to 80 mesh, and the material was placed in the horizontal fluidized magnetic separation device of Example 1 for magnetic separation for 3 minutes, and the magnetic separation The iron oxide content in the final material was reduced to 1.62%, the alumina content was 22%, and the removal rate of iron oxide was 42.37%. After calcination and activation at 750°C for 2 hours, the alumina content was 29.33%, and the iron oxide content was reduced to 2.16%. ; The material after magnetic separation should be iron-removed under the following acid leaching conditions. According to the solid-to-liquid ratio of 1:3, add hydrochloric acid with a concentration of 10mol / L (mass fraction: 30%), and pickle at 50°C for 30 minutes. The iron oxide removal rate of the process is 49%; the total iron oxide removal rate of the two-step iron removal is 70.61%, and ...

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Abstract

The invention provides an iron removing method during the process of extracting aluminum from coal gangue, and is used for solving the problems that the iron content in the coal gangue is high while the conventional magnetic separation method cannot meet the requirement of the aluminum extracting process. The method comprises the following steps of: firstly pretreating the coal gangue by using a horizontal-type fluidized magnetic separation device; calcining and activating the pretreated coal gangue; and removing residual iron by adopting an acid leaching process at a low temperature and in short time as well as under the action of an concentrated acid. After the two-step iron removing method is performed, the obtained material is leached in the acid to extract the aluminum, so that the mass ratio of Al / Fe being above 25 in a filtrate can be obtained; and thus the preparation of subsequent crystallized aluminum chloride or alumina is not influenced. According to the method, the high iron removing efficiency is achieved; the filtrate obtained by the acid soluble iron removing process can serve as a building material additive after being treated; the simple equipment is required; and the secondary pollution is avoided.

Description

technical field [0001] The invention relates to a resource utilization technology of coal series solid waste, in particular to an iron removal method in the process of extracting aluminum from coal gangue. Background technique [0002] Coal gangue is the largest solid waste produced by the coal industry, and its alumina, silica, and carbon contents account for more than 90% of the total gangue. With the reduction of metal mineral resources and the reduction of grades, the utilization of coal gangue resources to extract aluminum to prepare chemical products has become a research hotspot, which can not only alleviate the shortage of bauxite resources, but also reduce solid waste stockpiling and realize Its high value utilization is of great significance. Due to the influence of the aluminum-silicon ratio, acid extraction is generally used to extract the alumina, but due to the presence of iron-containing minerals in gangue, the leaching of iron in the process of acid leaching...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C1/02C01G49/10
Inventor 程芳琴肖亚宁崔莉王东飞张俊才
Owner SHANXI UNIV
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