Impurity removal method for arsenic trichloride high-boiling residues
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A high-boiler of arsenic trichloride and technology of arsenic trichloride, applied in the field of metallurgy, can solve the problems of secondary pollution of arsenic-containing waste slag, unfriendly environment, high treatment cost, etc., achieve less reagent consumption, environmental friendliness, high purity high effect
Active Publication Date: 2021-07-30
FIRST RARE MATERIALS CO LTD
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[0003]
The current main treatment method for arsenic trichloride high boilers is to hydrolyze arsenic trichloride high boilers. This method produces a large amount of arsenic-containing wastewater and arsenic-containing waste residues. The treatment cost is high, and the arsenic-containing waste residues may cause secondary The risk of secondary pollution, not friendly to the environment
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Embodiment 1
[0026] Step 1, take 1000g of arsenic trichloride high boiler (Fe: 6mg / L, Bi: 133mg / L, Sb: 1008mg / L, Se: 136mg / L) and 200g of 50% sulfuric acid solution and stir after mixing, stirring The rotating speed is 300r / min, and 962g of crude arsenic trichloride solution (Fe: 1mg / L, Bi: 3mg / L, Sb; 371mg / L, Se: 43mg / L, S: 14mg / L) and impurities containing sulfuric acid solution;
[0027] Step 2, distill the crude arsenic trichloride liquid in step 1 at 130°C to 140°C to further remove impurities, and obtain 941g of refined arsenic trichloride liquid (Fe:<1mg / L, Bi:<1mg / L, Sb : 2mg / L, Se: 8mg / L, S: <1mg / L).
Embodiment 2
[0029] Step 1, get 1000g of arsenic trichloride high boiler (Fe: 8mg / L, Bi: 156mg / L, Sb: 986mg / L, Se: 113mg / L) and 200g of 60% sulfuric acid solution and stir after mixing, stirring The rotating speed is 600r / min, and 978g of crude arsenic trichloride solution (Fe: 1mg / L, Bi: 2mg / L, Sb; 324mg / L, Se: 37mg / L, S: 29mg / L) and impurities containing sulfuric acid solution;
[0030] Step 2, distill the crude arsenic trichloride liquid in step 1 at 130°C to 140°C to further remove impurities, and obtain 957g of refined arsenic trichloride liquid (Fe:<1mg / L, Bi:<1mg / L, Sb ; 1mg / L, Se: 6mg / L, S: <1mg / L).
[0031] It can be seen from the examples that sulfuric acid solution is used to wash and remove impurities from the heavy fraction of arsenic trichloride, and the arsenic trichloride obtained after removing sulfur by distillation is of high purity, and the refined arsenic trichloride enters the high-purity arsenic production system for further processing. The reuse reduces the genera...
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Abstract
The invention provides an impurity removal method of an arsenic trichloride high-boiling residue, the impurities of the arsenic trichloride high-boiling residue comprise Se, Sb, Fe and Bi, and the method comprises the following steps: step 1, mixing the arsenic trichloride high-boiling residue with a sulfuric acid solution according to a certain proportion, stirring, and separating to obtain a crude arsenic trichloride solution and a sulfuric acid solution containing impurities; and 2, distilling the crude arsenic trichloride solution obtained in the step 1 at 130-140 DEG C to further remove impurities so as to obtain a fine arsenic trichloride liquid. According to the method, the arsenic trichloride high-boiling residues are washed to remove impurities by adopting the sulfuric acid solution, the purity of the obtained arsenic trichloride is high after sulfur removal in a distillation mode, the refined arsenic trichloride enters a high-purity arsenic production system to be recycled, generation of arsenic-containing wastewater and waste residues is reduced, and the method is easy to operate, small in reagent dosage and environmentally friendly.
Description
technical field [0001] The disclosure relates to the technical field of metallurgy, in particular to a method for removing impurities from arsenic trichloride high boilers. Background technique [0002] High-purity arsenic is mainly used in the manufacture of gallium arsenide, indium arsenide and other compound semiconductors, infrared transmission glass, high-purity hard alloy, medicine and health and other fields. The chlorination-reduction method is a commonly used method for the preparation of high-purity arsenic, which mainly uses 95%-99% crude arsenic as a raw material, and prepares high-purity arsenic through vacuum sublimation, chlorine gas chlorination, rectification purification, and hydrogen reduction. , in the process of its rectification and purification, a part of arsenic trichloride high-boiler will be produced, and the impurity content in it is high, which cannot enter the next production process, and needs to be released from the production system for proces...
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