The slow-cooling slag of a copper smelting company in Gansu Province contains 1.65％copper,and the contents of MgO and Al2O3 are relatively high,which are 3.22％and 4.23％respectively.When the content of MgO and Al2O3 is large,it is easy to lead to large foam viscosity,poor copper enrichment effect,but also promote the formation of slag amorphous,hinder the precipitation growth of sulfide particles,adverse to the copper recovery effect,resulting in copper phase granulari-ty.In the stage grinding stage separation process,the addition of sodium hexametaphosphate in roughing Ⅰ operation and sodi-um sulfide in roughing Ⅱ operation can achieve qualified copper concentrate in roughing Ⅰ operation,and at the same time,the floating speed of copper ores can be significantly increased.When the fineness of the second stage grinding is increased to-325 mesh 98％,the copper grade of the copper separation tailings can be further reduced.The test results show that copper concentrate with 20.64％copper grade and 84.34％copper recovery was obtained in the closed circuit process,and the copper tailings contained 0.239％copper.The product meets the requirements of copper smelting and the test index is good.
维普
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