磷石膏高温高压实验及其改性

周登峰; 单双明; 杨瑞东; 罗朝坤; 倪莘然; 汪龙波

doi:10.11858/gywlxb.20200656

磷石膏高温高压实验及其改性

doi: 10.11858/gywlxb.20200656

周登峰^{1, 2,},
单双明³,
杨瑞东^{1, 2,*, ,},
罗朝坤^{1, 2},
倪莘然^{1, 2},
汪龙波^{1, 2}

1.
贵州大学资源与环境工程学院，贵州贵阳　550025
2.
贵州大学喀斯特地质资源与环境教育部重点实验室，贵州贵阳　550025
3.
中国科学院地球化学研究所，贵州贵阳　550002

基金项目: 国家重点研发计划（2018YFC1903501）；贵州省科技厅科技平台及人才团队建设计划（黔科合平台人才[2018]5613）

详细信息

作者简介:
周登峰(1993－)，男，硕士研究生，主要从事矿物学、岩石学、矿床学研究.E-mail：dfzhou2019@163.com

通讯作者:
杨瑞东（1963－），男，教授，博士生导师，主要从事矿床学及地球化学研究.E-mail：rdyang@gzu.edu.cn

中图分类号: O521.2; TQ177.39; X754
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出版历程
- 收稿日期: 2020-12-13
- 修回日期: 2021-01-25

High Temperature and High Pressure Experiment and Modification of Phosphogypsum

ZHOU Dengfeng^{1, 2
,},
SHAN Shuangming³,
YANG Ruidong^{1, 2,*
, ,},
LUO Chaokun^{1, 2},
NI Xinran^{1, 2},
WANG Longbo^{1, 2}

1.
School of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, Guizhou, China
2.
Key Laboratory of Karst Geological Resources and Environment, Ministry of Education, Guizhou University, Guiyang 550025, Guizhou, China
3.
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, Guizhou, China

摘要

摘要: 以磷石膏高温高压实验及其改性处理为重点研究内容，探讨了高温高压条件对磷石膏单一体系和磷石膏复合体系的影响。通过控制高温高压实验条件，探究不同磷石膏体系在300 ℃、300 MPa的温压条件下的晶体形貌及矿物组成。采用X射线衍射（XRD）、扫描电子显微镜（SEM）对合成样品的物相和形貌进行分析。XRD表征结果表明，在高温高压条件下，不同磷石膏体系的矿物种类及含量发生了明显变化，具体表现为：磷石膏-生石灰复合体系经高温高压实验后，其SiO₂含量低于检测限；磷石膏-硅藻土复合体系经高温高压实验后，其矿物由二水石膏全部转化为无水石膏。SEM表征结果显示：在磷石膏单一体系、磷石膏-生石灰复合体系、磷石膏-硅灰复合体系、磷石膏-水泥复合体系中，磷石膏晶体在高温高压下可在反应釜内自发生长结晶，形貌规整且分散均匀，晶形大多呈四棱柱状，晶体表面光滑，且出现团聚现象。磷石膏-硅藻土复合体系在高温高压条件下生成大量的硫酸钙晶须，其形貌规整、分散均匀，平均直径为 2.61 μm，平均长径比约为8。
- 磷石膏 /
- 高温高压 /
- 掺料 /
- 硫酸钙晶须 /
- 长径比
Abstract: In this paper, the effects of high temperature and high pressure on single system and composite system of phosphogypsum were studied. By controlling the experimental conditions of high temperature and high pressure, the crystal morphology and mineral composition of different phosphogypsum systems at 300 ℃ and 300 MPa were studied. The phase and morphology of the synthesized samples were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD characterization results show that the mineral types and contents of different phosphogypsum systems were changed significantly under high temperature and high pressure. The specific performance is as follows: after high temperature and high pressure test, the SiO₂ content of phosphogypsum-quicklime composite system is lower than the detection limit; after high temperature and high pressure test, the mineral of phosphogypsum-diatomite composite system is completely transformed from dihydrate gypsum to anhydrous gypsum. SEM characterization results show that: in single phosphogypsum system, phosphogypsum-quicklime composite system, phosphogypsum-silica fume composite system and phosphogypsum-cement composite system, phosphogypsum crystals can spontaneously grow and crystallize in the reactor under high temperature and high pressure, with regular morphology and uniform dispersion. Most of the crystals are tetragonal, with smooth surface and agglomeration. The results show that the morphology of calcium sulfate whiskers is regular and uniform, the average diameter is 2.61 μm, and the average aspect ratio is about 8.
- phosphogypsum /
- high temperature and high pressure /
- admixture /
- calcium sulfate whisker /
- aspect ratio

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图 1 原状磷石膏的SEM照片^[25]

Figure 1. SEM photos of original phosphogypsum^[25]

下载: 全尺寸图片幻灯片

图 2 原状磷石膏的XRD谱^[26]

Figure 2. XRD patterns of original phosphogypsum^[26]

下载: 全尺寸图片幻灯片

图 3 高温高压下磷石膏复合体系的XRD谱

Figure 3. XRD patterns of the phosphogypsum composite system under high temperature and pressure

下载: 全尺寸图片幻灯片

图 4 高温高压下磷石膏复合体系的SEM图像

Figure 4. SEM images of phosphogypsum composite system under high temperature and high pressure

下载: 全尺寸图片幻灯片

表 1 磷石膏的化学成分及含量（质量分数）^[24]

Table 1. Chemical composition and content of phosphogypsum (Mass fraction)^[24] %

CaO Fe₂O₃ Al₂O₃ SiO₂ SO₃ MgO P₂O₅ TiO₂ CaF₂ H₂O Other

31.060 0.190 0.520 4.910 42.050 0.131 1.350 0.017 0.780 4.992 14.000

下载: 导出CSV

表 2 磷石膏基复合体系配料

Table 2. Ingredients of phosphogypsum based composite system

Sample Mixed ingredients

A Phosphogypsum
B 95% phosphogypsum + 5% quicklime powder
C 90% phosphogypsum + 10% silica fume
D 90% phosphogypsum + 10% portland cement
E 90% phosphogypsum + 10% diatomite

下载: 导出CSV

表 3 磷石膏复合体系的矿物成分

Table 3. Mineral composition of phosphogypsum composite system

Sample Mass fraction/%
CaSO₄·2H₂O SiO₂ CaSO₄

A 2.2 6.8 91.0
B 4.6 0 95.4
C 5.4 6.4 88.3
D 1.5 0.8 97.8
E 0 10.3 89.7

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参考文献(28)

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CaO	Fe₂O₃	Al₂O₃	SiO₂	SO₃	MgO	P₂O₅	TiO₂	CaF₂	H₂O	Other
31.060	0.190	0.520	4.910	42.050	0.131	1.350	0.017	0.780	4.992	14.000

Sample	Mixed ingredients
A	Phosphogypsum
B	95% phosphogypsum + 5% quicklime powder
C	90% phosphogypsum + 10% silica fume
D	90% phosphogypsum + 10% portland cement
E	90% phosphogypsum + 10% diatomite

Sample	Mass fraction/%
Sample	CaSO₄·2H₂O	SiO₂	CaSO₄
A	2.2	6.8	91.0
B	4.6	0	95.4
C	5.4	6.4	88.3
D	1.5	0.8	97.8
E	0	10.3	89.7

磷石膏高温高压实验及其改性

doi: 10.11858/gywlxb.20200656

作者简介: 周登峰(1993－)，男，硕士研究生，主要从事矿物学、岩石学、矿床学研究.E-mail：dfzhou2019@163.com

通讯作者: 杨瑞东（1963－），男，教授，博士生导师，主要从事矿床学及地球化学研究.E-mail：rdyang@gzu.edu.cn

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出版历程

High Temperature and High Pressure Experiment and Modification of Phosphogypsum

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出版历程

目录

作者简介:
周登峰(1993－)，男，硕士研究生，主要从事矿物学、岩石学、矿床学研究.E-mail：dfzhou2019@163.com

通讯作者:
杨瑞东（1963－），男，教授，博士生导师，主要从事矿床学及地球化学研究.E-mail：rdyang@gzu.edu.cn