Nickel slag
Nickel sulfide concentrate output matting smelting slag and smelting copper sulfide slag similar output i.e. when the fayalite type of slag concentrate, typically containing 5% F and 40%, and SiO 2 30% ~ 40%. Residue Fe 2+ /Fe 3+ decreases as the oxygen potential increases, and the reverberatory furnace and flash furnace slag contain Fe 3 O 4 usually higher than 10%, and the electric furnace slag contains Fe 2 O 4 lower as the nickel niobium grade rises ( <5%). The nickel-smelting slag generally belongs to the FeO-SiO 2 system and the FeO-SiO 2 -CaO (MgO) system. The FeO-SiO 2 -CaO state diagram is shown in Figure 1. From Fig. 1, the melting temperature of a certain composition of slag can be determined. By using the eutectic composition of these oxides, the slag composition having the lowest melting point can be obtained. For example, Fe 2 SiO 4 is lower in the vicinity of the olivine, and is about 1200 ° C. After the addition of CaO, the melting point is reduced, which can be reduced to about 1100 °C near the S and K points in Figure 1. During the smelting process, attention must be paid to the change of Fe 3 O 4 , so FeO—Fe 2 O 3 —SiO should be studied. 2 slag system, as shown in Figure 2. This slag has four primary crystal faces, namely, Fe phase, FeO float phase, Fe 3 O 4 phase, and SiO 2 phase. The melt region at a certain temperature is quadrangular (located on the left side of Fig. 2, close to the SiO 2 -FeO line), and is a slag in which a certain amount of Fe 3 O 4 is dissolved in the FeO-SiO 2 slag. This melt zone expands as the temperature increases. At 1200 ~ 1300 ℃, Fe 3 O 4, metal metal saturation solubility of 10% to 20%. The slag produced by the copper bismuth and nickel bismuth blowing can be considered as a saturated FeO-SiO 2 slag of Fe 3 O 4 . Since the nickel ore raw material often contains more MgO, the produced slag contains more MgO. The slag of the original electric furnace smelting of Jinchuan Company is divided into (%): 0.20 Ni, 0.10 Cu, 26.85 Fe, 0.07 Co, 0.8 S, 3.73 CaO, 10.51 MgO, 38.35 SiO 2 . The slag containing MgO less than 10% has no great influence on the slag property. When the MgO content exceeds 14%, the melting point of the slag rises rapidly, the viscosity increases, and the unit power consumption increases. As seen from Fig. 3, the slag property was keratinized due to precipitation of refractory 2MgO.SiO 2 (melting point 1890 ° C). However, when the MgO content in the slag is higher than 22%, the slag conductance increases, and as the MgO content in the slag increases and the FeO content decreases, the slag contains a lower valence metal. The slag contains CaO in the range of 3% to 8%, which has no effect on the slag properties. When the content of CaO increases to about 18%, the conductance of the slag increases by 1 to 2 times, the density and viscosity of the slag decrease, and the melting point increases. However, the solubility of sulfides in the slag is reduced. Mini Grass Chopper ,Grass Chopper,Grinder Grass Chopper,Grass Cutter Straw Chopper Shuangfeng Nongjiabao Machinery Technology Co., Ltd , https://www.starchmachine.nl
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