Study On New Process And Mechanism Of Separating Cobalt And Sulfur From A Complex Co-S Concentrate Using Oxidizing Roasting

Cobalt,as a valuable metal resource associated with Panxi vanadium-titanium magnetite,has an important comprehensive recovery value.Relevant scholars at home and abroad have carried out a lot of research work,due to factors such as low cobalt grade,fine inlay size,and complex mineral composition,the comprehensive utilization rate of cobalt resources is still low.At present,the associated valuable metal cobalt in vanadium-titanium magnetite is enriched by flotation in the separation process of iron and titanium to obtain a cobalt-sulfur mixed concentrate containing about 0.60%of cobalt.Due to the cobalt-bearing mineral and pyrite have the close symbiotic relationship It is more difficult to use physical methods to further separate.Therefore,in this paper,for the complex cobalt-sulfur concentrate in Panxi region,the separation and cobalt separation research was carried out by a combined separation and smelting process combining roasting and flotation,which promoted the synthesis of cobalt resources of cobalt and vanadium-titanium magnetite.First of all,a lot of research has been carried out on the process mineralogy of cobalt-sulfur concentrates.The results show that:cobalt-sulfide concentrates contain 0.67%cobalt,and most of the cobalt exists in pyrite and nickel-containing pyrite in the form of homogeneous and inclusions medium;the main metal minerals are pyrite,nickel pyrite,magnetite,ilmenite,and a small amount of cobalt sulfide;the main gangue minerals are talc,chlorite,quartz,olivine,serpentine,etc.Secondly,the oxidative roasting method was used for the evolution of mineral phases during the oxidative roasting of the cobalt-sulfur concentrate,and the influence on the grades of cobalt and sulfur.The research results show that the desulfurization rate exceeds80 when the roasting temperature is 400?-600?;When the roasting temperature is700?-900?,the sulfur content is further reduced,the desulfurization rate is slowed down,and the desulfurization is basically complete at 900?.When the temperature exceeds 600?,the formation of magnesite,magnetite and hematite in the oxidized roasted ore,talc gradually decomposes and disappears in the process of temperature increase,and forms magnesium iron spinel,a small amount of chromium,Magnesium,in the form of lattice substitution,enters the spinel lattice to form zinc-containing spinel,magnesia-iron spinel,and some cobalt-magnesium elements are substituted into the chromite by the lattice to form cobalt-magnesium-iron-chromium Ore,cobalt chromite;when the temperature is 900?,pyrite and hematite?FeS₂?are transformed into hematite and maghemite?Fe₂O₃?,but some magnetite still exists?Fe₃O₄?.After oxidative roasting of cobalt-sulfur concentrate,cobalt transforms from cobalt sulfide mineral to a new cobalt mineral phase mainly composed of cobalt oxide mineral,which creates favorable conditions for the further separation of cobalt.Finally,a large amount of cobalt separation test was carried out on the oxidized roasted ore by sulfidation flotation process.The results showed that:at a roasting temperature of900?,roasting time of 120 min,sodium sulfide 2500g/t,sulfide time of 15min,amyl yellow medicinal Under the conditions of oxidative roasting-sulfidation flotation process with an amount of 250 g/t,a cobalt concentrate product with a cobalt grade of 18.2%and a cobalt recovery rate of 83.4% was obtained.