Commercial Tests for Fluidized-bed Chlorination of Titanium Slag High in Calcium and Magnesium Without Sieve Plate
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摘要: 以高钙镁钛渣和低钙镁钛渣为主要原料进行无筛板沸腾氯化工业试验,针对高钙镁易引起炉料结块,堵塞筛板,影响沸腾氯化正常进行的特点,主要采用逐渐增加高钙镁钛渣配入比例、适当增大配碳量及定期排渣等技术措施,避免了高钙镁对沸腾氯化的不利影响;试验过程中主要考察了氯化炉内反应温度、压力波动情况和排渣情况,并对炉渣、收尘渣及尾气进行了化学成分分析。工业试验表明:随着高钙镁钛渣配入量的增大,氯化炉内的反应段温度和炉顶温度存在下降的趋势,可以通过补充热量的形式解决;排渣较顺畅,床层压力波动情况正常,炉渣、收尘渣及尾气中的化学成分波动正常。采用无筛板沸腾氯化炉氯化高钙镁钛渣制取四氯化钛具有可行性。Abstract: Commercial tests for fluidized-bed chlorination without sieve plate were carried out using titanium slag high or low in calcium and magnesium as main raw materials.In view of the fact that high calcium and magnesium content tends to cause agglomeration of the burden and blockage of the sieve plate which affects the normal process of chlorination,measures including gradual increase of blending ratio of high calcium and magnesium content titanium slag,appropriate addition of carbon and regular deslagging were taken to avoid negative influences.During the experiments,reaction temperatures in the fluidized-bed chlorinator,pressure fluctuation and deslagging conditions,as well as chemical analyses on furnace slag,slag from dust collecting and tail gas were studied.The commercial tests show that as the amount of titanium slag high in calcium and magnesium increases,there is a downward trend for reaction temperature in the fluidized-bed chlorinator and furnace top temperature,which can be solved by additional heat supply; slag discharging and fluctuation of bed pressure as well as the chemical compositions of furnace slag,slag from dust collecting and tail gas are in normal.It is feasible to use fluidized-bed chlorinator without sieve plate to chloridize titanium slag high in calcium and magnesium to obtain titanium tetrachloride.
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