Float grinding high nickel matte secondary nickel sulfide concentrate output, the output electrode and the electrolytic anode butt soot material returning charged casting reverberatory furnace, combustion of the fuel (pulverized coal, heavy oil, coal and natural gas) The heat is supplied to melt the charge and maintain the temperature of the furnace at 1,350 ° C, and slag is removed to remove some impurities. The melt is discharged, and the intermediate pouring bag is inserted into the casting mold of the linear casting machine. When it is cooled to 650-700 ° C, it is taken out and placed in a thermal insulation pit for 48 hours to complete the crystal transformation to ensure that the anode plate is not brittle during electrolysis. The recovery rate of nickel in the casting is 98% or more, and the direct yield is 97%. Jinchuan company's main chemical raw materials before casting division are listed in Table 1.
Table 1 Main chemical constituents of various raw materials for melt-casting nickel sulfide anodes (%)
raw material name | Ni | Cu | Fe | Co | S |
Secondary nickel concentrate | 66.5 | 2.8 | 2.3 | 1.00 | 23.8 |
Anode residue | 68.1 | 3.3 | 1.5 | 0.98 | 24.5 |
Smoke | 20.9 | 2.9 | 2.1 | 0.52 | 8.1 |
Sorghum residue | 68 | 3.3 | 2.0 | 0.80 | 30.9 |
The chemical composition of the nickel sulfide anode plates of the main manufacturers in China is listed in Table 2.
ingredient | Ni | Cu | Co | Fe | S | Zn | Pb |
Jinchuan Company | >65 | <5 | 0.8 to 1.0 | <1.9 | 19~25 | <0.004 | <0.005 |
Chengdu Electric Steel Factory | 65~70 | <7 | 0.8 to 1.0 | 3 to 5 | 20~22 | 1.01~0.05 | Trace |
Chongqing Smelter | 62~65 | 9 to 11 | 0.6 to 0.8 | 2.5 to 3.0 | 22~23 | 0.025～0.05 | 0.03～0.05 |
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