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<p>Phosphogypsum is an industrial waste, and it can be produced anhydrite to utilization. Some phosphogypsum impurities can be removed by flotation process. To detect the influence of flotation purification on anhydrite properties, anhydrites were prepared by calcining at different temperature from phosphogypsum, floated phosphogypsum and gypsum analytical reagent, respectively. The phase, superplasticizer dosage of normal consistency, setting time, whiteness, damp compressive strength and hydration rate of anhydrite were studied. The phase was mainly composed of anhydrite. The whiteness of anhydrite increased first and then decreased with the increase of calcination temperature. After phosphogypsum was treated by flotation process, the whiteness of anhydrite was significantly improved. With the increase of calcination temperature, the superplasticizer dosage decreased in all anhydrite. The setting time of all anhydrite prolonged first and then shortened with the increase of calcination temperature. After phosphogypsum was treated by flotation process, the setting time of the anhydrite prepared at 400–600 ℃ was significantly shortened, while the anhydrite prepared at 700–900℃ was slightly prolonged. The strength of anhydrite was significantly improved. After curing 28 days, the strength of anhydrite calcined at 600 ℃ for 2 h, was 49.01 MPa.</p>

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Effect of phosphogypsum flotation purification on anhydrite properties

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Changrong Liu,
  • Hongbin Tan,
  • Xiaoling Ma,
  • Feihua Yang,
  • Jixiu Zhang,
  • Faqin Dong,
  • Maksim Kamarou,
  • Dmitry Moskovskikh,
  • Valentin Ramanovski

摘要

Phosphogypsum is an industrial waste, and it can be produced anhydrite to utilization. Some phosphogypsum impurities can be removed by flotation process. To detect the influence of flotation purification on anhydrite properties, anhydrites were prepared by calcining at different temperature from phosphogypsum, floated phosphogypsum and gypsum analytical reagent, respectively. The phase, superplasticizer dosage of normal consistency, setting time, whiteness, damp compressive strength and hydration rate of anhydrite were studied. The phase was mainly composed of anhydrite. The whiteness of anhydrite increased first and then decreased with the increase of calcination temperature. After phosphogypsum was treated by flotation process, the whiteness of anhydrite was significantly improved. With the increase of calcination temperature, the superplasticizer dosage decreased in all anhydrite. The setting time of all anhydrite prolonged first and then shortened with the increase of calcination temperature. After phosphogypsum was treated by flotation process, the setting time of the anhydrite prepared at 400–600 ℃ was significantly shortened, while the anhydrite prepared at 700–900℃ was slightly prolonged. The strength of anhydrite was significantly improved. After curing 28 days, the strength of anhydrite calcined at 600 ℃ for 2 h, was 49.01 MPa.