A method for preparing arsenic pentoxide by pressure oxidation of antimony soot
A technology of arsenic pentoxide and soot, which is applied in the direction of improving process efficiency, can solve the problems of large consumption of sodium sulfide and oxidant, poor industrial economy, etc., and achieves low production cost, low consumption of chemical reagents, and labor intensity. small effect
Inactive Publication Date: 2018-10-23
CENT SOUTH UNIV
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Embodiment 1
[0028] Example 1: The main components of antimony soot are (%) by weight percentage: Sb48.5, As18.4 and Pb5.7. Antimony soot is slurried by adding water at a liquid-solid ratio of 4 / 1. The slurry is added to a stainless steel high-pressure reactor, and oxygen gas is introduced into the reactor to discharge the residual air. The oxygen partial pressure is controlled to be 0.4MPa and ventilated for 2 minutes, and then heated up to High temperature to 200°C, control the partial pressure of oxygen to 0.8MPa and react for 2.0h. When the reaction is completed, cool down and lower the temperature to 75°C, use vacuum filtration to achieve liquid-solid separation. After the leached residue is dried, the arsenic content is reduced to 2.4%. The removal rate reached 91.32%. Raise the temperature of the leaching solution to 75°C, and then introduce hydrogen sulfide gas to purify and remove antimony and lead. The amount of hydrogen sulfide is 1.0 times the theoretical amount. When 25.0% of...
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Abstract
The invention discloses a method for preparing arsenic pentoxide through pressurized oxidation of antimony soot. According to the method, oxygen is introduced and pressurized oxidation leaching is carried out on the antimony soot in a high-temperature aqueous solution to ensure that various arsenic oxides are dissolved into the solution in an arsenic acid form; hydrogen sulfide is introduced into the leaching liquid to purify and remove impurity metals; arsenic pentoxide products are prepared through carrying out spray pyrolysis on the purified liquid; and the cooled water is returned to the pressurized oxidation leaching process. The essence of method disclosed by the invention is that the effective dissolving of arsenic in the antimony soot is realized in the pressurized oxidation leaching way and the leaching rate of the arsenic can be up to above 85.0%; and the arsenic pentoxide in the solution is recovered in the spray pyrolysis way and the purity of the arsenic pentoxide is up to above 99.0%. The method disclosed by the invention has the advantages that the technical index in the technical processes is stable; the chemical reagent consumption is low; the production cost is low and the like.
Description
technical field [0001] The invention relates to heavy metal metallurgical processes in the field of nonferrous metallurgy, in particular to a hydrometallurgical method for effectively preparing arsenic pentoxide from antimony soot under pressure and oxidation. Background technique [0002] Antimony is a silvery-white metal that is brittle and has poor electrical and thermal conductivity. It is mainly used in alloys, military industry, flame retardants and glass industries. my country is the country with the largest antimony output in the world. In 2010, the world's antimony output was 167,000 tons, while China's antimony output reached 150,000 tons in 2010, accounting for more than 89% of the world's antimony output. my country's antimony resources and production All have irreplaceable advantages. The mineral raw materials for antimony smelting mainly include stibnite, antimony gold ore and brittle lead antimony ore, etc., while antimony soot is an important secondary raw ma...
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IPC IPC(8): C22B7/02C22B30/04
CPCC22B7/006C22B7/02C22B30/04Y02P10/20
Inventor 刘伟锋刘亮强孙百奇杨天足陈霖张杜超
Owner CENT SOUTH UNIV