Preparation of Calcium Sulfate from Recycled Red Gypsum to Neutralize Acidic Wastewater and Application of High Silica Residue
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT(2024)
摘要
Red gypsum (RG) is an industrial waste generated from the titanium dioxide process produced. For the low-cost and high-benefit utilization of RG, calcium sulfate (CaS) was prepared from recycled RG. Rod-like gypsum crystals with a rough surface, uniform size, 1 µm in diameter and 5 µm in length, were obtained, when the as-prepared CaS was divided into three equal portions and one portion was added at each interval of 2 h to neutralize the simulated acidic wastewater. CaS was prepared from RG to neutralize acidic wastewater to produce silicon-enriched RG for the next cycle. High silica residue (HSR) was obtained after 6 cycles. The effect of calcined temperature on the desulfurization of HSR was investigated. The sulfur content in the residue decreased by 97
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关键词
Red gypsum,Acidic wastewater,Cycle times,Activity index,Desulfurization
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