Technical Research On Deep Removal Of Arsenic And Antimony From High-impurity Blister Copper Fire Refining

The content of arsenic and antimony in a copper smelter at a copper smelter is very high,after blister copper refining,the anode copper produced cannot meet the requirements of the anode copper enterprise standard.Therefore,it is urgent to take measures to solve the problem of excessive arsenic and antimony content in the blister copper refining stage.Arsenic and antimony have an adverse effect on the properties of copper,arsenic and antimony can reduce the electrical conductivity of copper,arsenic can cause cracks in the interior of the hot-worked copper profiles,antimony can worsen copper’s cold workability.Arsenic,antimony,and copper are mutually soluble in the liquid state,and As₂O₅ and Sb₂O₅combine with oxides such as Ni O,Cu₂O,and Pb O to produce compounds such as arsenate and nickel mica that can be dissolved in the copper solution,making it difficult to remove arsenic and antimony.The topic of this topic has a strong pertinence,and the research results have practical significance in promoting the progress of blister copper refining technology in this plant.Analyze the phase of the samples such as matte copper,white metal,converter slag,blister copper,anode copper,and anode slag taken from this plant,to study the presence,phase structure,and distribution of arsenic and antimony in the sample,mastered the transformation of the presence,phase structure and distribution of arsenic and antimony in the refining stage of copper-copper converter and blister copper anode furnace.In the matte copper there is a high concentration of antimony and lead combined phases.In white metal,arsenic and lead grow closely.Most of arsenic and antimony in blister copper and anode copper exist as oxides and are mostly distributed on the edge of cuprous oxide.Arsenic and antimony oxides in blister copper are combined with lead oxide and bismuth oxide.The oxides of arsenic and antimony in the anode copper are separated from the lead oxide;the boundaries of the arsenic and antimony oxide particles are not clear and are mainly diffuse or cloudy.No arsenic or antimony was found in converter slag or anode slag by either optical microscope or electron microscope.Finally,a mixture of calcium carbonate and sodium carbonate was used as a decontaminant,the optimum ratio was determined through experiments,and suitable experimental parameters were explored.（1）Remover formula:the mass fraction of calcium carbonate is 80%,and the mass fraction of sodium carbonate is 20%.（2）Experimental parameters:crude copper mass for the experiment:about 250 g;impurity removing agent amount:0.6%of crude copper mass;experimental temperature:1200 to 1220°C;gas flow rate:0.118 Nm³/h;air stirring time:10 min.（3）Experimental results:the removal rates of arsenic and antimony were 99.54%and 50.88%,respectively.From the phase diagram,it can be seen that at the temperature of copper smelting,the magnesia-chromium brick can react with the added demisitioning agent to form solid solution,Ca Cr₂O₄ and Na₂Cr₂O₄.According to calculations,the amount of Ca Cr₂O₄ and Na₂Cr₂O₄ produced will not be large.The removal of the miscible agent at the temperature of blister copper refining does not reduce the refractoriness of the magnesite-chrome brick,and the addition of the demisting agent does not affect the normal production of the copper smelter.