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Method for separating iron from raffinate in process of extracting scandium from red mud

A technology for raffinate and iron separation, applied in the field of iron separation, can solve problems such as large energy consumption, unfavorable environmental protection, etc., and achieve the effects of avoiding environmental pollution, reducing energy consumption, and reducing resource waste.

Inactive Publication Date: 2011-05-25
TAIYUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods consume a lot of energy and are not conducive to environmental protection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Take 500mL of red mud raffinate, add 4mL of hydrogen peroxide, and add the prepared extraction agent according to the ratio of 1:1, shake for 15min, let it stand for stratification, and separate after the liquid surface is clear. The organic phase was back-extracted with 0.01mol / L hydrochloric acid heated to 50°C, the ratio of the weight parts of the hydrochloric acid to the organic phase was 1:1, and the separatory funnel was shaken for 15 minutes, then allowed to stand for stratification, until the liquid level After the separation was clear, the lower inorganic phase was collected. The inorganic phase is neutralized with 0.5mol / L ammonia water until the pH value reaches 8.0-9.0, and there is a large amount of Fe(OH) 3 A precipitate formed, was filtered off with suction and dried. Fe(OH) 3 The precipitate was calcined at 500°C for 1 h to obtain Fe 2 o 3 6.14g, the recovery rate is 98.5%.

Embodiment 2

[0052] Take 500mL of red mud raffinate, add 4mL of hydrogen peroxide, and add the prepared extraction agent according to the ratio of 1:1, shake for 15min, let it stand for stratification, and separate after the liquid surface is clear. The organic phase was back-extracted with 0.01mol / L hydrochloric acid heated to 50°C, the ratio of the weight parts of the hydrochloric acid to the organic phase was 1:1, and the separatory funnel was shaken for 15 minutes, then allowed to stand for stratification, until the liquid level After the separation was clear, the lower inorganic phase was collected. The inorganic phase is neutralized with 1mol / L ammonia water until the pH value reaches 8.0-9.0, and there is a large amount of Fe(OH) 3 A precipitate formed, was filtered off with suction and dried. Fe(OH) 3 The precipitate was calcined at 500°C for 1 h to obtain Fe 2 o 3 6.22g, the recovery rate is 99.9%.

Embodiment 3

[0054]Take 500mL of red mud raffinate, add 4mL of hydrogen peroxide, and add the prepared extraction agent according to the ratio of 1:1, shake for 15min, let it stand for stratification, and separate after the liquid surface is clear. The organic phase was back-extracted with 0.01mol / L hydrochloric acid heated to 50°C, the ratio of the weight parts of the hydrochloric acid to the organic phase was 1:1, and the separatory funnel was shaken for 15 minutes, then allowed to stand for stratification, until the liquid level After the separation was clear, the lower inorganic phase was collected. The inorganic phase is neutralized with 1.5mol / L ammonia water until the pH value reaches 8.0-9.0, and there is a large amount of Fe(OH) 3 A precipitate formed, was filtered off with suction and dried. Fe(OH) 3 The precipitate was calcined at 500°C for 1 h to obtain Fe 2 o 3 6.20g, the recovery rate is 99.5%.

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Abstract

The invention relates to a method for separating iron from raffinate in the process of extracting scandium from red mud and belongs to the technical field of recovering iron from red mud raffinate. The problem to be solved is the method for separating iron from waste liquid of rear earth extraction by using tri-butyl-phosphate (TBP). The technical scheme is that: the method comprises the following steps of: 1, pretreating the TBP; 2, preparing an extracting agent from the TBP and sulphonated kerosene; 3, pretreating the red mud raffinate by using 30 percent hydrogen peroxide; 4, performing extraction; 5, performing backextraction by using 0.01 mol / L of hydrochloric acid at the temperature of 50 DEG C; 6, neutralizing precipitate by adding 0.5 to 1.5 mol / L of ammonia water to obtain iron hydroxide; and 7, roasting the iron hydroxide at the temperature of between 500 and 550 DEG C for 40 to 60 minutes to obtain iron oxide. By the method, the iron is recovered from the residual raffinate after rare-earth elements are separated from the red mud, so the red mud raffinate is effectively utilized and waste of resources is reduced.

Description

technical field [0001] The invention discloses a method for separating iron from a raffinate obtained by extracting scandium from red mud, and belongs to the technical field of iron recovery from red mud raffinate. Background technique [0002] In the process of separating rare earth elements from red mud, iron generally exists in a large amount in the acid leaching solution in the form of ferric chloride. The iron in the red mud raffinate is difficult to recycle; and the iron in the red mud raffinate is a precious secondary resource, and its recycling has important practical significance. [0003] At present, there are several ways to recover iron from red mud. One is to reduce and sinter more than 80% of iron oxide into metallic iron through rotary kiln at 1000°C; The third is to dissolve the red mud in two stages at a certain temperature, the recovery rate of iron can only reach 50% to 60%, and the melting process is long, and the grade of iron ore recovered is not high....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38C01G49/06
CPCY02P10/234Y02P10/20
Inventor 王克勤李爱秀王保成崔杏雨王皓张风林陈津弓永昌弓永刚张美林弓永盛
Owner TAIYUAN UNIV OF TECH