钛石膏-H2SO4-H2O体系中石膏-硬石膏的相变规律

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (2): 725-732.

钛石膏-H₂SO₄-H₂O体系中石膏-硬石膏的相变规律

王倩^1,2,3, 彭同江^1,2,3,4, 孙红娟^1,2,3, 丁文金^1,2,3, 林艳^1,2,3

1.西南科技大学环境与资源学院,绵阳 621010;
2.西南科技大学,固体废物反应与资源化教育部重点实验室,绵阳 621010;
3.西南科技大学矿物材料及应用研究所,绵阳 621010;
4.西南科技大学,分析测试中心,绵阳 621010

收稿日期:2021-09-18 修回日期:2021-11-02 出版日期:2022-02-15 发布日期:2022-03-01
通讯作者: 彭同江,博士,教授。E-mail:tjpeng@swust.edu.cn
作者简介:王倩(1995—),女,硕士研究生。主要从事固体废弃物资源化利用的研究。E-mail:896291854@qq.com

Phase Transformation Law of Gypsum-Anhydrite in Titanium Gypsum-H₂SO₄-H₂O System

WANG Qian^1,2,3, PENG Tongjiang^1,2,3,4, SUN Hongjuan^1,2,3, DING Wenjin^1,2,3, LIN Yan^1,2,3

1. School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China;
2. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China;
3. Institute of Mineral Materials and Application, Southwest University of Science and Technology, Mianyang 621010, China;
4. Analytical and Testing Center, Southwest University of Science and Technology, Mianyang 621010, China

Received:2021-09-18 Revised:2021-11-02 Online:2022-02-15 Published:2022-03-01

摘要/Abstract

摘要： 本文研究了在常压下钛石膏-H₂SO₄-H₂O体系中石膏相向硬石膏相的转化,探索了反应时间、硫酸浓度和温度对石膏-硬石膏转化的影响。结果表明:提高反应温度、增大硫酸浓度和增加反应时间都有利于石膏向硬石膏转化;当石膏转化为硬石膏后,延长反应时间硬石膏不再发生转变;在温度为70 ℃和80 ℃时,体系中石膏与硬石膏共存,二者的微观形貌差异明显,石膏呈片状,硬石膏呈长方板状;当温度升温至90 ℃以上时,石膏完全转变为硬石膏,其微观形貌为长方板状;常压下,在50~100 ℃内,在钛石膏-H₂SO₄-H₂O体系中发生的石膏-硬石膏的相变是石膏直接脱水形成硬石膏,没有中间产物形成。

关键词: 钛石膏, 石膏相变, 钛石膏-H₂SO₄-H₂O体系, 硬石膏, 微观形貌, 酸浸法

Abstract: In this paper, the transformation of gypsum to anhydrite phase in titanium gypsum-H₂SO₄-H₂O system under atmospheric pressure was studied. The effects of reaction time, sulfuric acid concentration and temperature on the transformation of gypsum to anhydrite were explored. The results show that increasing reaction temperature, sulfuric acid concentration and reaction time are beneficial to the transformation of gypsum to anhydrite. When gypsum is converted to anhydrite, the anhydrite do not change after prolonging the reaction time. When the temperature is 70 ℃ and 80 ℃, gypsum and anhydrite coexist in the system, and there are obvious differences in the microstructure, gypsum is flake, and anhydrite is rectangular plate. When the temperature rises above 90 ℃, gypsum is completely transformed into anhydrite, and its microscopic appearance is rectangular plate. Under atmospheric pressure, in the range of 50 ℃ to 100 ℃, gypsum-anhydrite transformation occurs in the system of titanium gypsum-H₂SO₄-H₂O system, gypsum is directly dehydrated to anhydrite, no intermediate products are formed in the process.

Key words: titanium gypsum, gypsum phase transformation, titanium gypsum-H₂SO₄-H₂O system, anhydrite, microscopic morphology, acid leaching method

中图分类号:

TQ110.9

王倩, 彭同江, 孙红娟, 丁文金, 林艳. 钛石膏-H₂SO₄-H₂O体系中石膏-硬石膏的相变规律[J]. 硅酸盐通报, 2022, 41(2): 725-732.

WANG Qian, PENG Tongjiang, SUN Hongjuan, DING Wenjin, LIN Yan. Phase Transformation Law of Gypsum-Anhydrite in Titanium Gypsum-H₂SO₄-H₂O System[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 725-732.

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钛石膏-H₂SO₄-H₂O体系中石膏-硬石膏的相变规律

Phase Transformation Law of Gypsum-Anhydrite in Titanium Gypsum-H₂SO₄-H₂O System

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