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Mineral leaching process of bastnaesite

A bastnaesite and process technology, applied in the field of bastnaesite leaching technology, can solve the problems of high labor cost, waste of water resources and high energy consumption, and achieve the effects of saving consumption, easy dehydration and easy treatment

Active Publication Date: 2014-02-05
LESHAN SHENGHE RARE EARTH CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a bastnaesite leaching process to solve the problems of waste of water resources, high energy consumption and large labor cost in the above process

Method used

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Examples

Experimental program
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Embodiment

[0026] (1) Put 2t of bastnaesite into the reaction tank, add 3m?? flocculant, and then add hydrochloric acid to make the acidity H + =12-15 g / L, raise the temperature to 80-90°C, and react for 1.5 hours to obtain a leaching residue and an immersion liquid; the concentration of the first immersion liquid is 180g / L.

[0027] (2) Carry out alkali transfer to the leaching residue obtained in step (1) with sodium hydroxide: add NaOH in the alkali transfer tank to adjust the value so that 0H - =90—100, enter the high-pressure alkali transfer tank for 8 hours, and obtain the alkali transfer slag after washing with water;

[0028] (3) Carry out secondary leaching with hydrochloric acid to the alkali conversion slag obtained in step (2), add 3m? + =15-20 g / L, react for 1.5 hours to obtain the secondary immersion solution and the second immersion residue; the concentration of the second immersion solution is 100g / L.

[0029] (4) Wash the secondary leaching slag obtained in step (3) w...

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Abstract

The invention discloses a mineral leaching process of bastnaesite. The mineral leaching process comprises the following steps of: (1) leaching bastnaesite with hydrochloric acid for the first time, and adding a flocculating agent to obtain first leaching residue and first leaching liquid; (2) performing alkaline transfer on the first leaching residue obtained in step (1) by using sodium hydroxide to obtain alkaline transfer residue; (3) leaching the alkaline transfer residue obtained in step (2) by hydrochloric acid for the second time, and adding the flocculating agent to obtain second leaching liquid and second leaching residue; (4) washing the secondary leaching residue obtained in step (3) by using clean water to obtain secondary leaching residue washing water; (5) preparing the flocculating agents used in step (1) and (3) through the secondary leaching residue washing water obtained in step (4); (6) mixing the first leaching liquid obtained in step (1) and the second leaching liquid obtained in step (3); and extracting and separating rare earth. The mineral leaching process is mainly applied to bastnaesite.

Description

technical field [0001] The invention belongs to the technical field of rare earth smelting and separation, and in particular relates to an ore leaching process of bastnaesite. Background technique [0002] Bastnaesite is the second largest rare earth resource in my country. At present, the industry mainly adopts oxidative roasting-hydrochloric acid primary leaching, and then defluorides through alkali decomposition, and then secondary leaching of the primary leaching residue with hydrochloric acid. Both the above-mentioned primary leaching and secondary leaching need to add flocculants, and after leaching, the secondary leaching residue is washed, and the obtained washing water is mixed with the primary immersion liquid and the secondary leaching liquid, and steam heating and concentration treatment is carried out after mixing. The processed high-concentration material The solution is used for rare earth extraction and separation. There are several problems in the process o...

Claims

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Application Information

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IPC IPC(8): C22B3/10C22B3/22C22B59/00
CPCY02P10/20
Inventor 夏磊杜元忠汤朝文曾明金占云陈雪松黄浩徐亚林蔡红艳刘艳
Owner LESHAN SHENGHE RARE EARTH CO LTD
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