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Method for extraction of scandium in titanium chloride smoke dusts and fused salt chloride residues by using compound extraction agent

A composite extraction agent and molten salt chloride slag technology, applied in the field of scandium extraction, can solve the problems of low extraction rate, low recovery rate of scandium, large pollution and other problems, and achieve the convenience of industrial production and high total recovery rate of scandium , Improve the effect of leaching rate

Inactive Publication Date: 2013-12-11
连云港市丽港稀土实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the technical problems such as large pollution, low extraction rate, low purity of water leaching extraction method and low recovery rate of scandium in the current acid leaching extraction method, the present invention provides a method of using a composite extraction agent to remove titanium chlorination smoke and / or molten salt chlorination slag. The method of extracting scandium from the slag, which uses the high carbon content in the slag and then roasts the leaching slag to increase the total leaching rate of scandium, and uses a mixed extractant to extract scandium. The selectivity of scandium is good, and the leaching rate is high. High extraction rate and stripping rate, high total yield of scandium, lower cost and less damage to the environment, etc.

Method used

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  • Method for extraction of scandium in titanium chloride smoke dusts and fused salt chloride residues by using compound extraction agent
  • Method for extraction of scandium in titanium chloride smoke dusts and fused salt chloride residues by using compound extraction agent
  • Method for extraction of scandium in titanium chloride smoke dusts and fused salt chloride residues by using compound extraction agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add 200L of water to 100kg of titanium chloride fume (scandium content is 0.080%) for leaching for 8 hours, filter to obtain 190L of filtrate and 45kg of filter residue;

[0033] (2) Add 45kg of calcium chloride to the filter residue for roasting, then add 90L of 6M hydrochloric acid solution to the roasted filter residue for leaching for 8 hours, and filter to obtain 85L of filtrate and 24kg of filter residue (scandium content is 0.0092%), scandium leaching rate 97.24%;

[0034] (3) Combine the filtrates (chlorine content is 325g / L), add 150L of composite extractant to the filtrate for extraction, and obtain raffinate 275L (scandium content is 12mg / L), scandium extraction rate is 95.69%; The weight ratio is 10% P350, 35% TBP, 20% 2-octanol, and the balance is kerosene

[0035] (4) Add 40L of 5.0M nitric acid to the extractant for back extraction, the scandium content of the back extraction solution is 1.75g / L, and the scandium back extraction rate is 95.51%; add 1...

Embodiment 2-10

[0040] Method is with embodiment 1, and concrete parameter and effect are shown in the following table:

[0041]

[0042]

[0043]In the table, A represents titanium chloride fume, B represents titanium molten salt chloride slag (scandium content 0.11%), and the total amount of raw materials is 100kg; the ratio of composite extractant refers to P350: TBP: 2-octanol: kerosene.

Embodiment 11

[0044] Embodiment 11 Composite extractant comparative test

[0045] Using different extractants and proportions, the extraction test was carried out. The extract was selected from the combined extract of steps 1 and 2 in the above-mentioned embodiment 1. The specific composition and extraction rate are shown in the following table:

[0046] serial number

[0047] P507

[0048] No. 1-3 is the composition of the extractant of the present invention, and No. 4-10 is the contrast extractant. As can be seen from the above table, the extraction rate of the extractant of the present invention is obviously higher than that of the contrast extractant. It should be noted that the data in the above table are only exemplary data to show the superiority of the extractant of the present invention, and the applicant's large number of screening test data are not listed here one by one.

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Abstract

The invention relates to a method for the extraction of scandium in titanium chloride smoke dusts and fused salt chloride residues by using a compound extraction agent, and belongs to the technical field of rare-earth metals. The weight percent of particular components of the compound extraction agent is that: 5%-35% of P350, 15%-45% of TBP, 5%-35% of secondary-octyl alcohol, and 5%-35% of kerosene oil. According to the invention, a high purity scandium oxide is obtained through twice leaching, extraction, nitric acid reverse extraction, oxalic acid sedimentation, and scorching. The extraction method adopts once direct water leaching, and twice hydrochloric acid leaching after roasting to improve the leaching rate; the leaching rate of scandium surpasses 96%, meanwhile the using of acid is reduced, the industrialized production is facilitated, and the total recovery of scandium is high and surpasses 85%.

Description

technical field [0001] The invention relates to a method for extracting scandium from titanium chloride fume and molten salt chloride slag by using a composite extractant, and belongs to the technical field of rare earth metals. Background technique [0002] Scandium is located in the third subgroup of the periodic table of elements. Because its physical and chemical properties are similar to those of rare earth elements, and it often coexists together, scientists include it in the rare earth category and are called one of the rare earth elements. Scandium has excellent physical and chemical properties such as good thermal stability and light specific gravity, and is an important strategic material. Scandium and its compounds have many excellent properties and are widely used in national defense, metallurgy, chemical industry, aerospace, superconductivity, nuclear energy, laser, electronics and other fields. High-purity scandium oxide can be used in electron emission materi...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00B01D11/04
CPCY02P10/20
Inventor 李斌龚凌云
Owner 连云港市丽港稀土实业有限公司
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