Platinum group element high nickel bismuth extraction process

Separation of high nickel matte copper, nickel, iron, cobalt and other metals and sulphides, noble metals of the platinum group metals platinum enrichment process outputs concentrate.

High nickel niobium is an intermediate product of smelting platinum-containing metal copper-nickel symbiotic sulfide ore, mainly containing Ni3S2, Cu2S, Cu-Ni-Fe alloy and platinum group metal. The content of platinum group metals varies with the origin of high nickel bismuth. The higher the platinum group metal grade of high nickel ruthenium, the shorter the enrichment process and the higher the recovery rate of the platinum group metal. The main extraction methods are layered smelting, electrochemical dissolution, grinding and floating separation, pressure leaching, chlorine leaching and the like.

Layered melting is commonly known as the top-bottom method. The high nickel niobium block is reduced and smelted together with sodium sulfate and coke in a blast furnace or an electric furnace, and the formed Na2S and Cu2S in the high nickel niobium form a similar density of the similar crystalline melt, and the density of Ni3S2 which is not affected by Na2S. Large, divided into two layers due to different density, and can be peeled off after cooling.

The electrochemical solution is dissolved in a high concentration of nickel ruthenium as a soluble anode in an acidic electrolyte.

The high-nickel niobium melt was ground and slowly cooled in the steel mold for 72 h. During the slow cooling process, the crystal grains continued to aggregate and grow, and finally three phases of Cu2S, Ni3S2 and Cu-Ni-Fe alloy were formed.

The magnetically-flotation separation magnetically selected copper-nickel alloy (Cu-Ni-Fe) is treated by a copper-nickel alloy to extract a platinum group metal. The magnetic separation tailings re-flotation separates copper concentrate (Cu2S) and nickel concentrate (Ni3S2).

Flotation separation When the high nickel niobium Cu-Ni-Fe alloy has a small amount of phase, fine particles and poor dissociation, the copper concentrate containing few platinum group metals is first floated, and the platinum group metal is concentrated. Ni3S2 is mainly used in nickel concentrate containing a small amount of Ni-Cu-Fe alloy.

The pressure leaching is controlled by pressurizing and leaching the fine nickel ruthenium in a sulfuric acid solution. The leaching temperature of 103 to 443 K and the oxygen partial pressure of 0.3 to 0.7 MPa oxidize the sulfide of nickel and copper to soluble sulfate separation, and the platinum group metal is concentrated in the insoluble residue.

Chlorine leaching Chloride gas is introduced into the hydrochloric acid solution to leach the fine high nickel ruthenium. The ruthenium metal such as copper, nickel, iron or cobalt is transferred into the solution to be separated from the noble metal. The precious metal is enriched in an insoluble residue mainly composed of elemental sulfur. The residue is separated from the elemental sulfur to extract a platinum group metal concentrate.

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