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Method for extracting valuable metals from high-iron bauxite with step-by-step acid leaching

A high-iron bauxite and valuable metal technology, applied in the field of mineral processing, can solve the problems of large red mud discharge and low comprehensive utilization rate of valuable elements

Active Publication Date: 2012-08-22
DONGDA NONFERROUS SOLID WASTE TECH RES INST LIAOLING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the present invention provides a method for extracting valuable metals by stepwise acid leaching of high-iron bauxite, the purpose of which is to overcome the low comprehensive utilization rate of valuable elements and the large discharge of red mud existing in the prior art and other shortcomings

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  • Method for extracting valuable metals from high-iron bauxite with step-by-step acid leaching
  • Method for extracting valuable metals from high-iron bauxite with step-by-step acid leaching
  • Method for extracting valuable metals from high-iron bauxite with step-by-step acid leaching

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Experimental program
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Effect test

Embodiment 1

[0036] The high-iron bauxite is crushed and finely ground to a particle size of less than 250 μm, and a sulfuric acid solution with a mass concentration of 50% is used to conduct a one-step leaching reaction under the conditions of a leaching temperature of 120°C, a solid-liquid ratio of 1:3, and a leaching time of 240 minutes. The leaching rate of iron element is 97.05%. One-step leach solution and one-step leach slag are obtained. The one-step leach solution is crystallized to obtain ferric sulfate, and iron red is obtained through pyrolysis;

[0037] After the one-step leaching solution after crystallization is supplemented with acid to a sulfuric acid mass concentration of 30%, the alumina in the one-step leaching residue is leached in a second step under the leaching conditions of leaching temperature 170°C, solid-liquid ratio 1:20, and leaching time 240min. , to obtain the two-step leaching solution and the two-step leaching residue, the leaching rate of alumina in the tw...

Embodiment 2

[0041] The high-iron bauxite is crushed and finely ground to a particle size of less than 74 μm, and a sulfuric acid solution with a mass concentration of 30% is used to conduct a one-step leaching reaction at a leaching temperature of 60°C, a solid-liquid ratio of 1:20, and a leaching time of 60 minutes. The leaching rate of elements is 98.63%, and the one-step leachate and one-step leach residue are obtained, and the one-step leachate is crystallized to obtain ferric sulfate, and iron red is obtained through pyrolysis;

[0042] After adding acid to the sulfuric acid mass concentration of the one-step leaching solution to 60%, the alumina in the one-step leaching slag was subjected to two-step leaching under the leaching conditions of leaching temperature 190°C, solid-liquid ratio 1:10, and leaching time 120 minutes to obtain two One-step leaching liquid and two-step leaching slag, the leaching rate of alumina in the two-step leaching process is 99.45%, the second-step leachin...

Embodiment 3

[0046] The high-iron bauxite is crushed and finely ground to a particle size of less than 144 μm, and a sulfuric acid solution with a mass concentration of 10% is used to conduct a one-step leaching reaction under the conditions of a leaching temperature of 100°C, a solid-liquid ratio of 1:5, and a leaching time of 120 minutes. The leaching rate of elements is 99.16%, and the one-step leachate and one-step leach residue are obtained, and the one-step leachate is crystallized to obtain iron sulfate, and iron red is obtained through pyrolysis;

[0047] After adding acid to the sulfuric acid mass concentration of the one-step leaching solution to 60%, the alumina in the one-step leaching slag was subjected to two-step leaching at a leaching temperature of 200°C, a solid-liquid ratio of 1:5, and a leaching time of 240 minutes to obtain a two-step The leaching solution and the second-step leaching residue, the leaching rate of alumina in the second-step leaching process is 98.17%, t...

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Abstract

The invention belongs to the field of mineral processing, and specifically relates to a method for extracting valuable metals from high-iron bauxite with step-by-step acid leaching. The technical scheme of the invention is to extract multiple valuable metal elements in minerals with a step-by-step acid leaching method by taking high-iron bauxite as a raw material. The method comprises the following steps of: firstly, leaching the elements of scandium, gallium, iron and the like in the minerals at low temperature by use of low-concentration sulfuric acid; adding the aluminum-containing mineralphase into the first-step leached slag, and crystallizing the first-step leached liquid to obtain ferric sulfate; in the second-step leaching, extracting aluminum in the first-step leached slag underthe pressure leaching condition by use of the first-step leached liquid after iron removal and acid supplement; crystallizing the second-step leached liquid to obtain the aluminum sulfate product, and returning the second-step leached liquid after the crystallization to the first-step leaching for circular use; and after multiple times of circular enrichment of the elements of scandium, gallium and the like in the leached liquid, separating by an extraction method to obtain the scandium and gallium products. In the invention, the comprehensive utilization, acid and water circulation and zero discharge of wastes of the valuable elements in high-iron bauxite are realized through a step-by-step extraction method.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to a method for extracting valuable metals by step-by-step acid leaching of high-iron bauxite. Background technique [0002] my country is a country with large aluminum resources. As of 2009, the proven reserves of bauxite in my country have reached more than 2.3 billion tons, and the estimated reserves are more than 5 billion tons, mainly concentrated in Shanxi, Guizhou, Henan and Guangxi. Bauxite resources in the region are characterized by high iron content, and the content of rare precious metals in the minerals, such as scandium and gallium, is much higher than that of bauxite resources in other regions. Relevant studies have shown that: oxidation in high-iron bauxite in Guangxi The aluminum content is 45%~60%, the iron oxide content is 6%~40%, the scandium content is 0.0047%~0.012%, and the gallium content is 0.008%~0.014%. If the traditional Bayer method is used t...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/40C22B58/00C22B59/00C22B21/00
CPCY02P10/20
Inventor 张廷安吕国志豆志河刘燕赵爱春朱晓峰牛丽萍赵秋月蒋孝丽
Owner DONGDA NONFERROUS SOLID WASTE TECH RES INST LIAOLING CO LTD
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