IRON CONCENTRATE SYNTHESISED FROM WASTE FERROUS SULFATE PRODUCED IN TITANIUM WHITE PREPARATION

摘要

The titanium ore in Pan Zhi-hua deposit in China contains more calcium oxide and magnesium oxidernresidues. So it is not suitable to be used to produce titanium white by chlorination method, but it isrnsuitable by sulfuric acid leaching. Iron in ilmenite becomes ferrous sulfate when titanium whiternis produced by sulfuric acid leaching. Three to four tons of ferrous sulfates will be obtained when everyrnton of titanium white is produced. But the byproduct ferrous sulfate can’t be effectively reused, whichrnpollutes environment seriously. Therefore, effective utilisation of the byproduct becomes a majorrnconcern for Pan Zhi-hua mine. The experiment result shows that the iron concentration containingrn65 per cent iron can be obtained by using byproduct ferrous sulfate as raw material, throughrndewatering of ferrous sulfate under the moderate temperature of 300℃ - 400℃ and pyrolysisrnunder the high temperature of 1000℃. The density of sulfur dioxide in the gas produced by hightemperaturernpyrolysis ferrous sulfate is over eight per cent, so the density meets the standard ofrnmaking sulfuric acid. Because sulfuric acid and iron concentrate in Pan Zhi-hua Steel and IronrnCorporation can be fully utilised, the highly efficient utilisation of the byproduct ferrous sulfate canrnbe realised and the environmental pollution will be solved successfully.