Performace of a Kind of Organic Emulsion Coated Phosphogypsum Particles
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https: //doi. org/10.1007/s11595-020-2332-3
Performace of a Kind of Organic Emulsion Coated Phosphogypsum Particles CHENG Jiangguo1,2,3, ZHANG Jie2,3*, XIE Fei2,3, ZHANG Yusong2,3
(1. College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China; 2. Mining College, Guizhou University, Guiyang 550025, China; 3. Guizhou Key Laboratory of Comprehensive Utilization of Nonmetallic Mineral Resources, Guiyang 550025, China)
Abstract: The phosphogypsum particles coated with organic emulsion were prepared by coating three kinds of organic emulsion of silicone-acrylic, styrene-acrylic and acrylic. The structure and mineralogical characteristics, acid and alkali resistance, water resistance and dissociation degree of coated phosphogypsum were studied by means of SEM-EDAX, optical microscope, gravimetric analysis and chemical detection. The results showed that the initial emulsion can be used directly for coating and granulation of phosphogypsum. The spray re-coating was carried out by using diluted emulsion with the water-to-emulsion mass ratio of 1∶1. The organic emulsion coated phosphogypsum crystal can be clearly observed, and the mixing zone at internal boundary between the organic emulsion and phosphogypsum crystal was distinguishable under the optical microscope. SEM photos showed that the surface of coated phosphogypsum particles was smooth. And the basic elements of C, O, S and Ca can be detected by EDAX. Organic emulsion can be solidified into filmnetwork between the phosphogypsum crystals inside of the coated particles, and it can play a protective role in improving the acid resistance, alkali resistance and water resistance of phosphogypsum, and reduce the degree of dissociation of phosphogypsum in water. Key words: organic emulsion; phosphogypsum; coating; particle; resistance to acid and alkali
1 Introduction Surface coating treatment of materials is a process of wrapping one or more layers of organic or inorganic materials on the surface of some other original materials by using physical or chemical methods, and it can significantly change and improve the physical and chemical properties, especially improve the chemical stability of material as resistance of acid, alkali or water resistance, even some new characteristics[1,2]. It is also an effective mean to solve the defects of existing materials and prepare new materials, with the research including modification of superfine powder filler[3,4] and preparing battery electrode materials[5,6]. Phosphogypsum (PG) is a by-product of wet process phosphoric acid. It is formed mainly by the de© Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: Apr. 29, 2019; Accepted: June 18, 2020) CHENG Jiangguo(成奖国): Ph D candidate; E-mail: jgcheng@ gzu.edu.cn *Corresponding author: ZHANG Jie(张杰): Prof.; Ph D; E-mail: [email protected] Funded by the National Natural Science Foundation of China (No. 51164004) and the Chunhui Plan of the National Department of Education of China (No. Z2006-1-52003)
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