Research On Separating Copper And Arsenic From Black Copper Slag

Black copper slag produced in electrolyte purification process in copper electrolysis refining, the mass fraction of copper 50%, and arsenic 4-11% in the black copper slag,Because the arsenic in black copper slag is higher, the traditional method of melting process will result in great environmental pollution, and pose a threat to the quality of cathode copper.In order to deal with this part of the black copper slag,the study was carried out by the separation of copper and arsenic in black copper slag, In order to finding a suitable process for dealing with the black copper slagproduct in my company andfitting the present situation of production. Eventually this part arsenic would get out the copper smelting system.This research adopts two technologies for separating copper and arsenic in black copper slag.the first route: the black copper slag was leached with sulfuric acid, Afterwards,the arsenic was separated from the Leach liquor. At the same time, The leaching residue was roasted with sodium hydroxide for further separation of copper and arsenic. the second route: the black copper slag was roasted with sodium hydroxide directly, then the slag of copper was leached with sulfuric acid, the production is Copper sulfate solution was delivered to produce Copper salt. Comprehensive analysis of the two technologies route, it was organized production can make the arsenic(about 98%) separated from the copperaccording to the second route,process short, production organization easily, low reagent consumption, With the company’s existing process morereasonable.By the experiment,we Obtained the economicindicators and technicalindicators.(1).the optimum process conditions of roasting black copper slag: the Calcination temperature is 550℃, the alkali charge is 2.0, the roasting time is 2.0 h; the ratio of liquid to solid in water immersion is 5-6,the reaction temperature in water immersion is 60-65℃, the reaction time is 1 h. the ratio of liquid to solid in acid leaching is 9-10:1, acid coefficient is 1.2,the leaching temperature is 78-85℃, the leaching time is 3 h. Technical indicators: the black copper slag was roasted after water leaching, the removing rate of arsenic could reach more than 99%, the antimony and bismuth didn’t enter the solution, the copper’s leaching rate is above 98%, the Copper sulfate solution can be sent to the production of copper salt product.(2).Arsenic was precipitated from Water leach liquor.Process conditions: the reaction time is 1 hour, the temperature is 65℃, the dosage of lime is 2.0.Technical indicators: the Precipitation rate Of arsenic can reach more than 99%.