For the gold locked within hematite in the twostage calcination,which leads to a low gold leaching rate,the present work is aiming at pretreating the calcination to selectively dissolve hematite.The calcination was pretreated by sulfuric acid with cosolvent B.The factors influencing the hematite dissolution rate were studied,and the pretreatment parameters considered were H_2SO_4 content,B dosage and added time,leaching temperature and time.Simultaneously,mineralogy analysis of the calcination,H_2SO_4 pretreatment residue and cyanide leaching residue were also carried out.Results indicate that the hematite dissolution rate is quicker,the dissolution temperature is lower and the dissolution time is shorter in the role of cosolvent B than without B.At the same time,the gold locked within hematite is effectively released,so the leaching rate of gold cyanide increases about 10%than that in actual factory production.The results have an actual significance in guiding industrial production. For the gold locked within hematite in the twostage calcination, which leads to a low gold leaching rate, the present work is aiming at pretreating the calcination to selective dissolve hematite. The calcination was pretreated by sulfuric acid with cosolvent B. The factors influencing the hematite dissolution rate were studied, and the pretreatment parameters considered were H_2SO_4 content, B dosage and added time, leaching temperature and time. Simultaneously, mineralogy analysis of the calcination, H_2SO_4 pretreatment residue and cyanide leaching residue were also carried out. Results〗 that the hematite dissolution rate is quicker, the dissolution temperature is lower and the dissolution time is shorter in the role of cosolvent B than without B.At the same time, the gold locked within hematite is effectively released, so the leaching rate of gold cyanide increases about 10 % than that in actual factory production.The results have an actual significance in guiding industrial production.