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Method for extracting scandium from modified red mud by using composite extractant

A composite extractant and red mud technology, applied in the field of scandium extraction, can solve the problems of no industrial production, large acid consumption, low recovery rate, etc., and achieve the effects of high recovery rate, reduced acid consumption and high product purity

Inactive Publication Date: 2011-05-18
TAIYUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many reports on extracting scandium from red mud, but there are many disadvantages in extracting scandium directly from red mud, such as: large acid consumption during acid leaching; serious emulsification during organic phase extraction; low recovery rate, etc. Therefore, not industrially produced

Method used

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  • Method for extracting scandium from modified red mud by using composite extractant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for extracting scandium from modified red mud with a composite extractant is carried out in the following steps:

[0024] In the first step, the preparation of modified red mud, the following raw materials are configured in parts by weight:

[0025] First, take red mud, Na 2 CO 3 powder, CaO powder and water, red mud: Na 2 CO 3 : CaO: water = 10: 3: 2: 20; red mud, Na 2 CO 3 Put the powder, CaO powder and water into the crucible and stir evenly; then put the mixed liquid into the crucible boiler and roast it at 1080°C for 45min; then cool it to room temperature naturally; then, use 1mol / L of The NaOH solution was dissolved at 80°C, the weight ratio of the calcined product to the NaOH solution was 1:5, and the dissolution time was 30 minutes. The obtained dissolved product was washed twice with water, and then filtered and dried to obtain modified red mud;

[0026] In the second step, the modified red mud obtained in the first step is leached with 6.5mol / L...

Embodiment 2

[0036] A method for extracting scandium from modified red mud with a composite extractant is carried out in the following steps:

[0037] In the first step, the preparation of modified red mud, the following raw materials are configured in parts by weight:

[0038] First, take red mud, Na 2 CO 3 powder, CaO powder and water, red mud: Na 2 CO 3 : CaO: water = 10: 3: 2: 30; red mud, Na 2 CO 3 Put powder, CaO powder and water into the crucible, stir evenly; then put the mixed liquid into the crucible boiler and roast at 1050°C for 30min; The NaOH solution was dissolved at 75°C, the weight ratio of the calcined product to the NaOH solution was 1:4, and the dissolution time was 20 minutes. The obtained dissolved product was washed three times with water, and then filtered and dried to obtain modified red mud;

[0039] In the second step, the modified red mud obtained in the first step is leached with 6.5mol / L hydrochloric acid, the weight ratio of the modified red mud to hydr...

Embodiment 3

[0048] A method for extracting scandium from modified red mud with a composite extractant is carried out in the following steps:

[0049] In the first step, the preparation of modified red mud, the following raw materials are configured in parts by weight:

[0050] First, take red mud, Na 2 CO 3 powder, CaO powder and water, red mud: Na 2 CO 3 : CaO: water = 10: 4: 3: 50; red mud, Na 2 CO 3 Put the powder, CaO powder and water into the crucible and stir evenly; then put the mixed liquid into the crucible boiler and roast at 1100°C for 60min; The NaOH solution was dissolved at 90°C, the weight ratio of the calcined product to the NaOH solution was 1:6, and the dissolution time was 40 minutes. The obtained dissolved product was washed twice with water, and then filtered and dried to obtain modified red mud;

[0051] The second step to the seventh step are the same as in Embodiment 2.

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Abstract

The invention relates to a method for extracting scandium from modified red mud by using a composite extractant, belonging to the technical field of extraction and preparation methods of rare-earth metal scandium. The method for extracting the scandium from the modified red mud ensures good extracting effect, high recovery rate and product purity and is suitable for industrialized production. The method comprises the following steps of: a first step: preparing the modified red mud; a second step: leaching the modified red mud by using hydrochloric acids so as to obtain an acid leaching solution; a third step: preparing the composite extractant; a fourth step: mixing the acid leaching solution obtained from the second step with the composite extractant for extraction and separation; a fifth step: washing extracted upper organic phases by using the hydrochloric acids, then washing by using water, and then carrying out back extraction by using a NaOH solution to obtain an Sc(OH)3 solution; a sixth step: precipitating the Sc(OH)3 solution by using oxalic acids, and filtering, and drying; and a seventh step: roasting a solid obtained from the sixth step at high temperature to obtain white scandium oxide powder. The invention can be widely used for the technical field of extraction and preparation of the rare-earth metal scandium.

Description

technical field [0001] The invention discloses a method for extracting scandium from modified red mud by using a composite extractant, and belongs to the technical field of extraction and preparation methods of rare earth metal scandium. Background technique [0002] Red mud is the residue produced when bauxite is leached by strong alkali during the alumina production process. For every ton of alumina produced, 0.8 to 1.5 tons of red mud are produced. It is estimated that the world's aluminum industry produces about 90 million tons of red mud every year. The Ministry of Industry and Information Technology and the Ministry of Science and Technology of my country jointly issued the "Guidelines for the Comprehensive Utilization of Red Mud" in November 2010, and pointed out that "my country is As a big country producing alumina, it produced 23.78 million tons of alumina in 2009, accounting for about 30% of the world's total output, and produced nearly 30 million tons of red mud."...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/04C22B3/40C22B59/00
CPCY02P10/20
Inventor 李爱秀王克勤王皓白英彬张晓芸邓海霞朱国海弓庆珍张美林
Owner TAIYUAN UNIV OF TECH
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