磷石膏煅烧-酸浸除杂增白实验

王伟; 彭伟军; 田家新; 苗毅恒; 曹亦俊

doi:10.3969/j.issn.1000-6532.2024.03.011

磷石膏煅烧-酸浸除杂增白实验

郑州大学化工学院，河南　郑州　450010

基金项目: 2020年国家重点研发计划项目（2020YFC1908804）

详细信息

作者简介: 王伟（1993-），男，博士，副研究员，主要从事矿物材料及固废资源化

通讯作者: 彭伟军（1986-），男，博士，副教授/硕导，主要从事化工、冶金固废资源化方面的研究

中图分类号: TD989;TU525

收稿日期: 2022-08-21

刊出日期: 2024-06-25

Removal Impurity and Whitening of Phosphogypsum via Calcination and Acid Leaching

School of Chemical Engineering, Zhengzhou University, Zhengzhou 450010, Henan, China

More Information

Corresponding author: PENG Weijun, pwj@zzu.edu.cn

Received Date: 21 August 2022

Publish Date: 25 June 2024

摘要

摘要:
这是一篇冶金工程领域的论文。磷石膏产量及堆存量大，已成为制约磷化工行业绿色、健康发展的重要因素。磷石膏除杂增白是其高消纳综合利用的必经途径。对浮选除杂脱硅磷石膏进行分析发现其中仍存在少量的黑色有机物质，影响其白度。本文采用煅烧-酸浸法对其进行处理，在煅烧温度600 ℃、煅烧时间70 min、酸浸时间2 h、硫酸浓度1.5 mol/L、酸浸液固比5:1和酸浸温度90 ℃条件下，增白磷石膏的白度由51.5%增加到了92.7%，增白效果显著。增白磷石膏主要是CaSO₄，并含有少量的CaSO₄·2H₂O和CaSO₄·0.5H₂O，颗粒呈15～20 μm的不规则形状，且表面光滑。本研究对磷石膏规模化综合利用具有重要指导意义。
- 冶金工程 /
- 磷石膏 /
- 白度 /
- 煅烧 /
- 除杂 /
- 增白
Abstract:
This is an article in the field of metallurgical engineering. Large production and storage capacity of phosphogypsum has become an important factor restricting the green and healthy development of phosphorus chemical industry. Removing impurity and whitening of phosphogypsum is a necessary way for its high consumption. Analysis results showed that there was still a small amount of black organic matter in the phosphogypsum after removing impurity and desilication by flotation, which affected its whiteness. In the paper, calcination and acid leaching were adopted to treat the phosphogysum. The whiteness of whitened phosphogysum significantly increased from 51.5% to 92.7% at the conditions of calcination temperature 600 ℃, calcination time 70 min, acid leaching time 2 h, sulfuric acid concentration 1.5 mol/L, acid leaching liquid to solid ratio 5∶1 and acid leaching temperature 90 ℃. The whitened phosphogypsum was mainly CaSO₄, and contained a small amount of CaSO₄·2H₂O and CaSO₄·0.5H₂O. The particles of the whitened phosphogypsum were irregular in shape of 15～20 μm, and the surface was smooth. The study provided a guidance for the comprehensive utilization of phosphogypsum with high consumption.
- Metallurgical engineering /
- Phosphogysum /
- Whiteness /
- Calcination /
- Removing impurity /
- Whitening

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图 1 磷石膏的XRD

Figure 1.

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图 2 磷石膏SEM（a）及相应区域的拉曼光谱（b）

Figure 2.

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图 3 煅烧温度对磷石膏白度的影响

Figure 3.

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图 4 酸浸浓度对磷石膏白度的影响

Figure 4.

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图 5 酸浸温度对磷石膏白度的影响

Figure 5.

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图 6 酸浸时间对磷石膏白度的影响

Figure 6.

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图 7 酸浸液固比对磷石膏白度的影响

Figure 7.

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图 8 煅烧磷石膏（a）和增白磷石膏（b）的XRD

Figure 8.

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表 1 磷石膏X射线荧光分析结果/%

Table 1. XRF results of phosphogypsum

CaO SO₃ SiO₂ Fe₂O₃ SrO Na₂O MgO Al₂O₃ P₂O₅ 其他烧失量

33.36 41.99 0.63 0.05 0.08 0.06 0.02 0.16 0.63 0.96 22.06

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