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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 and unfavorable environmental protection, and achieve the effects of avoiding environmental pollution, reducing energy consumption and reducing resource waste.

Inactive Publication Date: 2012-10-03
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 500 mL of the red mud raffinate, add 4 mL of hydrogen peroxide, add the prepared extractant according to the ratio of 1:1, shake for 15 minutes, stand for layering, and separate after the liquid level is clear. The organic phase is back-extracted with 0.01mol / L hydrochloric acid heated to 50°C. The weight ratio of the hydrochloric acid to the organic phase is 1:1. The separatory funnel is shaken. After shaking for 15 minutes, it is allowed to stand for layering and wait for the liquid level. After the separation is clear, the lower inorganic phase is collected. The inorganic phase is neutralized with 0.5mol / L ammonia water until the PH value reaches 8.0~9.0, there is a large amount of Fe(OH) 3 Precipitation is generated, filtered with suction and dried. Fe(OH) 3 The precipitate is calcined at 500℃ for 1h to obtain Fe 2 O 3 6.14g, the recovery rate was 98.5%.

Embodiment 2

[0052] Take 500 mL of the red mud raffinate, add 4 mL of hydrogen peroxide, add the prepared extractant according to the ratio of 1:1, shake for 15 minutes, stand for layering, and separate after the liquid level is clear. The organic phase is back-extracted with 0.01mol / L hydrochloric acid heated to 50°C. The weight ratio of the hydrochloric acid to the organic phase is 1:1. The separatory funnel is shaken. After shaking for 15 minutes, it is allowed to stand for layering and wait for the liquid level. After the separation is clear, the lower inorganic phase is collected. The inorganic phase is neutralized with 1mol / L ammonia water until the PH value reaches 8.0~9.0, there is a large amount of Fe(OH) 3 Precipitation is generated, filtered with suction and dried. Fe(OH) 3 The precipitate is calcined at 500℃ for 1h to obtain Fe 2 O 3 6.22g, the recovery rate is 99.9%.

Embodiment 3

[0054] Take 500 mL of the red mud raffinate, add 4 mL of hydrogen peroxide, add the prepared extractant according to the ratio of 1:1, shake for 15 minutes, stand for layering, and separate after the liquid level is clear. The organic phase is back-extracted with 0.01mol / L hydrochloric acid heated to 50°C. The weight ratio of the hydrochloric acid to the organic phase is 1:1. The separatory funnel is shaken. After shaking for 15 minutes, it is allowed to stand for layering and wait for the liquid level. After the separation is clear, the lower inorganic phase is collected. The inorganic phase is neutralized with 1.5mol / L ammonia water until the PH value reaches 8.0~9.0, there is a large amount of Fe(OH) 3 Precipitation is generated, filtered with suction and dried. Fe(OH) 3 The precipitate is calcined at 500℃ for 1h 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 raffinateafter 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 present invention is a method for separating iron from the raffinate of extracting scandium from red mud, belonging to the technical field of recovering iron from the 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 leachate in the form of ferric chloride. After the rare earth elements are extracted from the acid leachate with an extractant, the red mud raffinate is due to the large amount of iron. The liquid is difficult to recycle; and the iron in the red mud raffinate is a precious secondary resource. Recycling it has important practical significance. [0003] At present, there are several ways to recover iron from red mud. One is to reduce more than 80% of the iron oxide into metallic iron by reducing and sintering at 1000℃ in a rotary kiln; the other is to directly smelt the red mud through an electric furnace. Born iron; the third is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/38C01G49/06
CPCY02P10/20
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