A method for preparing iron powder from copper slag based on alkali modification and low-temperature sulfidation reduction
A technology of low-temperature vulcanization and copper slag, applied in the field of comprehensive utilization of metallurgical resources, to achieve the effects of improving grade and reducibility, inhibiting dissolution, and avoiding melting
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Embodiment 1
[0050] Yunnan water-quenched copper slag, the particle size is less than 0.125mm (100 mesh), the total iron content is 40.57%, the silicon dioxide is 38.01%, the calcium oxide is 3.41%, the aluminum oxide is 3.92%, the magnesium oxide is 1.80%, and the copper content is 0.68%, the sulfur content is 0.78%, and the arsenic content is 0.17%. Alkaline salt is Na 2 CO 3 Pure chemical reagents.
[0051] Copper slag and Na 2 CO 3 Mix according to the mass ratio of 2:1 and 1:1 respectively, and roast at 1000°C for 4 hours. After the roasted sample is crushed and ground, it is washed with water, filtered, and dried. , Arsenic removal rate.
[0052] The experimental results show that copper slag and Na 2 CO 3 When the mass ratio is 2:1, the removal rates of silicon and arsenic are 67% and 88% respectively, increasing the Na 2 CO 3 Add content, copper slag and Na 2 CO 3 When the mass ratio is 1:1, the removal rates of silicon and arsenic are 82% and 92%, respectively, as shown...
Embodiment 2
[0056] Adopt the raw material identical with embodiment 1, copper slag and Na 2 CO 3 The mass ratio is controlled at 1:1, and the roasting is carried out at a temperature of 700-900 ° C for 4 hours. The roasted samples are processed and analyzed in the same steps as above.
[0057] The experimental results show that when the calcination temperature is 700°C, the removal rates of silicon and arsenic are 58% and 82% respectively; when the calcination temperature is increased to 850°C, the removal rates of silicon and arsenic are increased to 78% and 87% respectively; When the calcination temperature is further increased to 900°C, the removal rates of silicon and arsenic reach 80% and 91%, respectively. Therefore, increasing the calcination temperature is beneficial to increase the removal rate of silicon and arsenic in the copper slag. According to Example 1, when the calcination temperature is higher than 900°C, the improvement effect is not obvious, and the optimal temperatur...
Embodiment 4
[0066] The mass ratio of the above copper slag to sodium carbonate is 1:1, and the sample is roasted at 1000°C for 4 hours. After removing Si and As by water washing, it is used as a raw material for sulfide reduction, and is mixed with FeS and graphite powder to prepare carbon-containing pellets. Among them, Graphite powder is excessive, and the addition of FeS is 2% of the quality of pretreatment copper slag. Carbon-containing pellets at 1000-1150°C, N 2 Keep warm for 6 hours in the atmosphere for sulfidation reduction. After reaching the holding time, the sample is crushed and ground after cooling, and the slag and iron are separated by wet magnetic separation. The grade (total iron content, %) and metal The conversion rate (the ratio of metallic iron to total iron content, %), and the content of copper, sulfur, and arsenic, the experimental results are shown in Table 4.
[0067] The experimental results show that when the sulfide reduction temperature is 1000°C, the iron ...
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