焙烧与生石灰改性对磷石膏中可溶磷含量的影响

耿乾; 孙红娟; 彭同江; 丁文金; 罗东山; 陈秋菊

doi:10.13779/j.cnki.issn1001-0076.2019.04.002

焙烧与生石灰改性对磷石膏中可溶磷含量的影响

1.
西南科技大学固体废物处理与资源化教育部重点实验室，四川绵阳 621010

2.
西南科技大学矿物材料及应用研究所，四川绵阳 621010

3.
西南科技大学分析测试中心，四川绵阳 621010

基金项目:
西南科技大学2017年龙山学术人才科研支持团队项目（17LZXT11）

详细信息

作者简介: 耿乾(1995-), 男, 河北邢台人, 硕士研究生, E-mail:gengqian166@163.com

通讯作者: 孙红娟(1976-), 女, 安徽马鞍山人, 教授, 博士生导师, E-mail:sunhongjuan@swust.edu.cn

中图分类号: X754

收稿日期: 2019-04-09

刊出日期: 2019-08-25

Effect of Roasting and Quicklime Modification on Soluble Phosphorus Content in Phosphogypsum

1.
Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Mianyang 621010, China

2.
Institute of Mineral and Applicaton, Southwest University of Science and Technology, Mianyang 621010, China

3.
Analytical and Testing Center, Southwest University of Science and Technology, Mianyang 621010, China

More Information

Corresponding author: SUN Hongjuan, sunhongjuan@swust.edu.cn

Received Date: 09 April 2019

Publish Date: 25 August 2019

摘要

摘要:
磷石膏因含有可溶磷，限制了其在建材领域的应用。以生石灰作为改性剂，研究了不同生石灰/磷石膏质量比及不同焙烧温度下磷石膏中可溶磷含量的变化。采用X射线衍射仪、场发射扫描电镜、酸碱度仪和激光粒度分析仪等仪器对焙烧前后磷石膏的物相组成、微观形貌、酸碱度和粒度分布等进行分析对比。结果表明：当焙烧温度为100~200℃时，磷石膏中的石膏全部转变为烧石膏，磷石膏晶体表面发生破损，导致可溶磷含量随着焙烧温度的升高而逐渐增加；由于生石灰能促进可溶磷转化为难溶物质，在加入改性剂生石灰焙烧后，磷石膏中可溶磷得到有效降低，且随生石灰用量的增加，可溶磷含量不断降低；通过对磷石膏改性焙烧，可获得可溶磷含量极低的磷石膏。这将为磷石膏的资源化利用提供新的指导。
- 磷石膏 /
- 可溶磷 /
- 生石灰 /
- 焙烧 /
- 改性
Abstract:
Phosphogypsum contains soluble phosphorus, which limits the application of phosphogypsum in building materials. Using quicklime as a modifier, the content of soluble phosphorus in phosphogypsum under different mass ratio of quicklime/phosphogypsum and different calcination temperatures were studied. X-ray diffraction, field emission scanning electron microscopy, acidity-basicity analyzer and laser particle size analyzer were used to analyze and compare the phase composition, micro-morphology, acidity-basicity and particle size distribution of phosphogypsum before and after calcination. The results showed that all gypsum in phosphogypsum was converted to bassanite when the calcination temperature was between 100℃ and 200℃. The surface of the phosphogypsum crystal was damaged, which caused the soluble phosphorus content to increase gradually with the calcination temperature. Since quicklime can promote the conversion of soluble phosphorus into insoluble substance, the soluble phosphorus in phosphogypsum can be reduced effectively after adding the modifier of quicklime. The content of soluble phosphorus decreased with quicklime dosage. Phosphogypsum with a slight content of soluble phosphorus can be obtained by modifying and calcining. This will provide new guidance for the resource utilization of phosphogypsum.
- phosphogypsum /
- soluble phosphorus /
- quicklime /
- calcination /
- modification

HTML全文

图 1 不同焙烧温度磷石膏中可溶磷含量变化

Figure 1.

下载: 全尺寸图片幻灯片

图 2 不同焙烧温度磷石膏样品的XRD图

Figure 2.

下载: 全尺寸图片幻灯片

图 3 不同磷石膏样品的微观形貌

Figure 3.

下载: 全尺寸图片幻灯片

图 4 不同温度与生石灰添加量下磷石膏中可溶磷变化图

Figure 4.

下载: 全尺寸图片幻灯片

图 5 磷石膏pH值随生石灰添加量变化图

Figure 5.

下载: 全尺寸图片幻灯片

图 6 150 ℃下不同生石灰添加量磷石膏样品的XRD图

Figure 6.

下载: 全尺寸图片幻灯片

表 1 不同条件下磷石膏样品的的粒径分布表

Table 1. Particle size distribution of phosphogypsum samples under different conditions

粒度分布/μm	d₁₀	d₂₅	d₅₀	d₇₅	d₉₀	S.D.	Mean	C.V.
PG-0	1.256	4.239	28.14	78.63	169.8	69.40	56.01	124%
PG-T150	1.035	2.700	27.82	205.0	288.0	117.5	101.2	116%
PG-S1.0	2.092	8.023	28.46	52.10	80.08	31.83	35.27	90.3%

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