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Preparation method and application of modified sub-zinc oxide slag composite particles for arsenic-alkali slag to fix arsenic
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A technology of secondary zinc oxide and composite particles, which is applied in the field of arsenic fixation in arsenic-alkali slag, can solve the problems of low utilization rate of secondary resources, environmental pollution, waste of resources, etc. Effect
Active Publication Date: 2019-07-12
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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Problems solved by technology
Due to the relatively backward production technology in our country and the low utilization rate of secondary resources, a considerable part of secondary zinc oxide slag has changed from available resources to pollutants, which not only causes waste of resources, but also causes serious environmental pollution.
Method used
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[0029] Using sub-zinc oxide slag as raw material, add 5% of the mass of sub-zinc oxide slag to polymerized ferric sulfate, stir evenly to form a mixture, add 10% of water and 5% of the mass of potassium dihydrogen phosphate to the mixture, and prepare a 0.5mm-1.5 mm modified secondary zinc oxide slag composite particles.
[0030] Thermal activation treatment of modified suboxide zinc slag: roast the obtained modified suboxide zinc slag particles at 420° C. for 90 minutes, and use them after cooling.
[0031] 2. Method for fixing arsenic in arsenic-alkali slag:
[0032] First crush and sieve 500g of arsenic-alkali slag to obtain particles with a particle size of ≤1cm; then stir in a stirring reactor; add 20% modified suboxide zinc slag composite particles and 15% water, stir for 60 minutes, and cure for 7 days. Determination of arsenic leaching concentration. The water immersion concentration ...
[0035] Using sub-zinc oxide slag as raw material, add 2% iron salt polyferric sulfate by the mass of sub-zinc oxide slag, stir evenly to form a mixture, add 10% water and 3.8% potassium dihydrogen phosphate to the mixture, and prepare a 0.5mm -1.5mm modified secondary zinc oxide slag composite particles.
[0036] Thermal activation treatment of modified suboxide zinc slag: roast the obtained modified suboxide zinc slag particles at a temperature of 350° C. for 90 minutes, and use them after cooling.
[0037] 2. Method for fixing arsenic in arsenic-alkali slag:
[0038] First crush and sieve 500g of arsenic-alkali slag to obtain particles with a particle size of ≤1cm; then stir in a stirring reactor; add 12% modified suboxide zinc slag composite particles and 15% water, stir for 30 minutes, and cure for 7 days. Determination of arsenic leaching concentration. The water immersion concentration ...
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Abstract
The invention discloses a preparation method and application of modified zinc hypoxide slag composite particles for arsenic fixation of arsenic alkali slag. The preparation method of the modified zinc hypoxide slag composite particles for the arsenic fixation of the arsenic alkali slag comprises the steps that zinc hypoxide slag, ferric salt, water and monopotassium phosphate are mixed and granulated, calcination activation and cooling are conducted on the obtained particles, and then the modified zinc hypoxide slag composite particles are obtained. When used as an arsenic fixation additive to be applied to the arsenic fixation of the arsenic alkali slag, the modified zinc hypoxide slag composite particles show the advantages of good arsenic fixation effect and high stability. By the adoption of the preparation method and application of the modified zinc hypoxide slag composite particles for the arsenic fixation of the arsenic alkali slag, waste is treated by waste, and therefore cost is reduced.
Description
technical field [0001] The invention relates to a preparation method of modified secondary zinc oxide slag composite particles and its application in arsenic-alkali slag fixing arsenic, which belongs to the field of arsenic-alkali slag fixing arsenic. Background technique [0002] Arsenic exists widely in various non-ferrous metal minerals in nature. In the process of mining, smelting and extracting non-ferrous metals, arsenic is usually removed as a harmful impurity. Since arsenic is easily oxidized, the method of adding alkali to oxidize is generally used to remove arsenic. Antimony ore often contains arsenic, and soda ash is often added to remove arsenic during the antimony smelting process. The arsenic-containing slag obtained after removing arsenic is called arsenic-alkali slag. Arsenic in arsenic-alkali slag mainly exists in the form of sodium arsenate, which is highly toxic and easily soluble in water, and easily pollutes the environment. It is a kind of hazardous w...
Claims
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