For the sake of solve the problem of large amounts of carbon dioxide emissions and the environmental pollution caused during the process of copper slag dilution, a new method was proposed that using rubber seed oil replaced the diesel oil as a reducing agent for copper slag dilution. For proving the conception, the thermodynamic theory in the process of copper slag dilution was studied. The reaction mechanism of copper slag from rubber seed oil was analyzed. A large number reduction experiments were done that the rubber seed oil was also injected at different temperatures and time. Meanwhile the changes of magnetic iron content and viscosity of copper slag also were analyzed. The slag after dilution reduction was analyzed by XRD and SEM. The results showed that in the process of injection reduction the main reductant were carbon simple substance, hydrogen and carbon monoxide produced by rubber seed oil pyrolysis. Firstly, the magnetic iron was reduced to iron monoxide by the pyrolysis products (hydrogen, carbon monoxide, carbon simple substance), which could be produced by the rubber seed oil at high temperature. Meanwhile the iron monoxide combined with silicon dioxide in copper slag to form fayalite (ferric metasilicate). Secondly, the magnetic iron content in copper slag and the viscosity of copper slag can be reduced by increasing the temperature of dilution reduction. Copper in copper slag was collided and aggregated. Finally, the sediment accumulated at the bottom of the crucible. The ferrite phase increased and the magnet phase decreased during the dilution process. Copper particles first accumulated at the bottom of the crucible, then it increased from 1 cm to 3 cm slowly. The recovery rate of copper reached 86%.
He ZHENG Bo LI Hao ZHOU Yonggang WEI Hua WANG
. Dilution of copper slag under reduction of rubber seed oil[J]. The Chinese Journal of Process Engineering, 2019
, 19(3)
: 589
-596
.
DOI: 10.12034/j.issn.1009-606X.218284
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