In view of the poor washing effect on biological oxidation residue using the CCD three-stage countercurrent washing process in a gold production enterprise,as well as the poor subsequent cyanidation gold extraction index and the difficulty of cyanidation tailings slurry treatment,experiments are carried out on washing the biological oxidation ore pulp with a variety of washing processes.Experiments on cyanidation gold extraction from the biological oxidation residue treated by different washing processes are carried out.The results show that when the single-chamber feed washing filter press is used,the process is filter press＋air drying＋water washing＋air drying washing process,and the water washing ratio is 1.0,the performance is the best;compared with the CCD three-stage countercurrent washing process,the cyanide leaching rate and recovery rate of the biological oxidation residue treated by the process are significantly improved,and the As and refractory cyanide (mainly ferric(ferrous)cyanide) in the cyanide tailing slurry are significantly reduced,greatly reducing the difficulty of the subsequent environmental protection treatment of the cyanide tailing slurry.