TECHNOLOGICAL FLOWSHEET OF TREATEMENT OF SULFIDE COPPER CONCENTRATES AS BY-PRODUCTS OF NON-FERROUS METALS PRODUCTION

摘要

At Gipronickel Institute a technological flowsheet of pressure leaching of copper from rich copper concentrates (i.e. containing: Cu ―59-75%; Ni ―0.5-4.64%; Fe ―0.2-1.3%; S ―21.8-26.9%) was developed. As a result, the possibility of deep decomposition of copper-containing minerals with extraction of elemental sulphur (up to 90-95%) was established. The obtained sulphur concentrates contain 80-90% of elemental sulphur, which can be separated from sulphide residue through autoclave melting and settling. As a rule, sulphide concentrates remaining after extraction of sulphur contain up to 1-2% of noble metals. The sulphide concentrate can be purified to the level of rich concentrates or pure metals using the well-known methods as in the case of tankhouse slimes. The presented research specifies the parameters of main operations: pressure leaching and sulphur extraction. It was established that 98% of copper could be transferred into solution at temperatures of 108-110℃ and oxygen partial pressure 0.4-0.6 MPa. Experiments were carried out in autoclaves of various volumes using the products of nickel matte processing.