Study on Treatment of Molten Salt Chlorination Waste Slag of Titanium Metallurgy by Sodium Aluminate Curing Agent
In order to recover and utilize titanium metallurgy molten salt chlorination waste slag effectively,a new process of removing MgCl2 and CaCl2 from molten salt chloride slag by high temperature phase transformation with sodium aluminate as curing agent was proposed.Scanning electron microscope(SEM),X-ray diffractometer(XRD)and inductively coupled plasma atomic emission spectrometer(ICP-AES)were used to observe the morphology,phase analysis and composition,and the effects of the amount of curing agent and reaction temperature on the curing effect of calcium and magnesium in raw materials were studied.The results show that most of the insoluble calcium aluminate and magnesium aluminate appear in the middle and lower layers with the increase of additive content when the reaction temperature is 900℃.When the ratio of raw material to additive is 1:1.5,calcium and magnesium in the filtrate are mainly distributed in the lower layer with the increase of reaction temperature.Finally,the optimal treatment conditions are determined as the reaction temperature of 900℃,and the ratio of raw material to sodium aluminate curing agent is 1:1.5.
molten salt chlorination waste slagsodium aluminatesolidification reactionreaction temperature
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