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Iron removal method in acid aluminum smelting process

A technology of acid method and process, which is applied in the field of iron removal in the acid method aluminum smelting process, can solve the problems of unsatisfactory recovery and purification, and achieve the effect of good iron removal effect and easy industrial practice

Active Publication Date: 2016-03-02
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When pH>3.0, Ga 3+ It will start to precipitate from the acidic solution, which cannot meet the requirements of "one-step acid solution method" to purify the resin eluent to remove iron, recover and purify gallium

Method used

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  • Iron removal method in acid aluminum smelting process
  • Iron removal method in acid aluminum smelting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Take 1000ml of water or liquid after iron removal, pour it into a 1300ml stainless steel reaction tank, adjust the pH=2.0 with hydrochloric acid, adjust the temperature of the super constant temperature water bath to 90°C, start the stirrer, and stir slowly;

[0043] (2) When the temperature rises to 90°C, increase the stirring speed to 500r / min, take 2ml of purified resin eluent from the bottom of the reaction tank and add it to the bottom solution at one time, after 10min of reaction, add 1mol / L Na 2 CO 3 Adjust pH=2.0 with 12ml of solution;

[0044] (3) Repeat the feeding step until 80ml of purified resin eluent is added to obtain a goethite seed slurry of about 3g / L;

[0045] (4) Take 20ml of purified resin eluent from the bottom of the reaction tank and add it to the above-mentioned goethite seed slurry at one time. After 10 minutes of reaction, add 1mol / L Na 2 CO 3 Adjust pH=2.0 with 24ml of solution;

[0046] (5) Repeat the feeding step until 400ml of pur...

Embodiment 2

[0051] Except for step (2), the process conditions of other steps are the same as in Example 1. The process conditions of step (2) are adjusted to:

[0052] (2) When the temperature rises to 90°C, increase the stirring speed to 500r / min, take 4ml of the purified resin eluent from the bottom of the reaction tank and add it to the bottom solution at one time, and after 10min of reaction, use 1mol / L Na 2 CO 3 12ml of the solution was adjusted to pH=2.0.

[0053] It has been determined that in the solution after iron removal, the removal rate of iron is 99.7%, and the loss rate of gallium is less than 5.0%.

Embodiment 3

[0055] Except for step (2), the process conditions of other steps are the same as in Example 1. The process conditions of step (2) are adjusted to:

[0056](2) When the temperature rises to 90°C, increase the stirring speed to 500r / min, take 10ml of purified resin eluent from the bottom of the reaction tank and add it to the bottom solution at one time, after 10min of reaction, use 1mol / L Na 2 CO 3 12ml of the solution was adjusted to pH=2.0.

[0057] It has been determined that in the solution after iron removal, the removal rate of iron is 99.5%, and the loss rate of gallium is less than 5.0%.

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Abstract

The invention discloses an iron removal method in an acid-process aluminum metallurgy process. The iron removal method comprises the step of removing iron from purified resin eluant, wherein the step of removing iron from purified resin eluant comprises the following sub-steps: 1, preparing a goethite seed crystal through a quasi homogeneous nucleating method through an integral reaction device by adopting the purified resin eluant; and 2, hydrolyzing to remove the iron in the purified resin eluant in the presence of the goethite seed crystal by adopting a differential reaction device. According to the method, the iron ion in the purified resin eluant can be converted into goethite slag in a process for producing aluminum oxide through coal ash one-step acid dissolution method, on one hand, the problem of separation between gallium and iron is solved, and recovery and purification of the gallium are promoted; on the other hand, iron-containing wastewater is not generated, and the generated goethite slag has high utilization value. The method is simple in industry practice and good in iron removal effect.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to an iron removal method in an acid aluminum smelting process. Background technique [0002] In the "one-step acid-dissolving method" of fly ash to produce alumina, Ga / Fe selective resin is used to remove iron-rich gallium to obtain purified resin eluent. When gallium is recovered from the purified resin eluate, the method of reduction masking is usually used to solve the separation problem of gallium and iron. Among them, iron is discharged in the wastewater in the form of ferrous ions. If the iron-containing wastewater is directly discharged, the hydrolyzable iron ions in the wastewater will cause the dissolved oxygen in the water to decrease rapidly, and the drainage will be reddish orange and turbid, causing serious pollution to the environment. Finding a technically feasible and economically reasonable treatment method to recycle iron in wastewater is a part of enviro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/24C22B21/00
CPCY02P10/20
Inventor 张维世刘延红池君洲郭志峰赵飞燕张云峰秦兴东刘瑞平
Owner CHINA SHENHUA ENERGY CO LTD
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