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Method for recycling waste slag of fused salt chlorination

A technology of molten salt chlorination and recovery method, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve environmental pressure and other problems, and achieve the effects of saving time and cost, less slag, and simple steps

Active Publication Date: 2015-03-25
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chlorides treated by this method are directly piled up and cannot be fully utilized, which will still cause greater pressure on the environment and have not fundamentally solved the problem of stacking chlorinated waste residues.

Method used

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  • Method for recycling waste slag of fused salt chlorination

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preparation example Construction

[0047] The preparation method of artificial rutile usually includes oxidation-reduction to obtain modified raw materials; acid leaching to obtain leaching solution and leaching solid materials; leaching solid materials washing, filtering, drying and high-temperature calcination steps. Adding the regenerated molten salt slag to the acid leaching step can improve the grade of artificial rutile. Further, in order to improve the grade of rutile, as a preferred solution, by mass, the above-mentioned regenerated molten salt slag:modified raw material=20~50:100; more preferably by mass, the above-mentioned regenerated molten salt slag:modified raw material=40 ~50:100.

[0048] Furthermore, the leaching solution obtained in the above acid leaching step can be recycled and treated by using Ruthner waste acid roasting technology to produce regenerated acid and iron powder, which solves the problem of waste acid recycling.

[0049] Further, every time 100g of regenerated molten salt sla...

Embodiment 1

[0062] Embodiment 1 Preparation of regenerated molten salt slag of the present invention

[0063] a. After roughly crushing 1200 molten salt chlorination waste residue with a jaw crusher, ball mill it to -200 mesh ≥ 90%, then mix it with 3600ml of water, stir at room temperature for 1 hour, and filter to obtain filtrate and filter residue;

[0064] b. Recrystallize the filtrate to obtain 1057g of regenerated molten salt residue 1 with a recovery rate of 88.1%; the quality of the residue after drying is 132g.

[0065] The composition and content of the resulting regenerated molten salt slag and filter residue are shown in Table 2:

[0066] Table 2 Composition and percentage of regenerated molten salt slag and filter residue

[0067]

Embodiment 2

[0068] Embodiment 2 Preparation of regenerated molten salt slag of the present invention

[0069] a. After roughly crushing the 600-g molten salt chlorination waste residue with a jaw crusher, ball mill it to -200 mesh ≥ 90%, then mix it with 1800ml of water, stir at room temperature for 1.5h, and filter to obtain filtrate and filter residue;

[0070] b. Recrystallize the filtrate to obtain 535g of regenerated molten salt slag 2 with a recovery rate of 89.2%; the quality of the filter residue after drying is 60g.

[0071] The composition and content of the resulting regenerated molten salt slag and filter residue are shown in Table 3:

[0072] Table 3 Composition and percentage of regenerated molten salt slag and filter residue

[0073]

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Abstract

The invention relates to the method for recycling waste slag of fused salt chlorination and belongs to the field of resource recycling. The method for recycling the waste slag of fused salt chlorination comprises the following steps that a, the waste slag of fused salt chlorination is mixed with water, and filter liquor and filter residues are obtained after stirring and filtering, wherein the solid-to-liquid ratio of the waste slag of fused salt chlorination and the water is 1: (3-5) g / ml; b, recrystallization is carried out on the filter liquor to obtain regenerated fused salt slag, wherein the waste slag of fused salt chlorination is obtained during production of titanium sponge or titanium dioxide through a salt chlorination method. The invention further discloses application of the regenerated fused salt slag for improving the grade of artificial rutile. The method for recycling the waste slag of fused salt chlorination is simple in procedure and easy to operate, the obtained regenerated fused salt slag can be applied to production of the artificial rutile, and the grade of the artificial rutile can be improved by 3-6 percent.

Description

technical field [0001] The invention relates to a method for recovering molten salt chlorination waste residue, belonging to the field of resource recovery. Background technique [0002] The Panxi area is rich in titanium resource reserves, according to statistics, its reserves account for 35.7% of the world's titanium resources and 92.7% of the domestic titanium resources. However, CaO, MgO, SiO in the produced titanium concentrate 2 High content of impurities such as TiO 2 Low content, good acid solubility, basically used as raw material for sulfuric acid titanium dioxide. The level of comprehensive utilization of titanium resources in my country is relatively low. The output of sponge titanium accounts for only about 5% of the world's production, and titanium dioxide accounts for 9% of the world's production, and almost low-grade sulfuric acid process titanium dioxide. Therefore, how to make full use of high-end titanium products Giving full play to the advantages of ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047
Inventor 吴轩程晓哲缪辉俊叶恩东张溅波张兴勇
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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