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- Title
Preparation of calcium sulfate from recycled red gypsum to neutralize acidic wastewater and application of high silica residue.
- Authors
Wang, Chulei; Ma, Xiaoling; Zhong, Wanzhen; Tan, Hongbin; Yang, Feihua; Kamarou, Maksim; Moskovskikh, Dmitry; Ramanovski, Valentin
- Abstract
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% after calcined at 1200 ℃ for 2 h. According to GB/T 12957-2005 "Industrial waste residue activity test method for cement admixture", the activity index of desulfurized HSR was 90%, which it can be used as a cementing material.
- Subjects
CALCIUM sulfate; SEWAGE; INDUSTRIAL wastes; CEMENT admixtures; CRYSTAL surfaces; GYPSUM
- Publication
Journal of Material Cycles & Waste Management, 2024, Vol 26, Issue 3, p1588
- ISSN
1438-4957
- Publication type
Article
- DOI
10.1007/s10163-024-01914-w