Effect of HPO42− and brushite on gypsum reactivity and implications for utilization of phosphogypsum in plaster production

磷石膏 石膏 灌木岩 生产(经济) 反应性(心理学) 环境科学 自然资源经济学 废物管理 化学 材料科学 冶金 医学 工程类 经济 有机化学 替代医学 原材料 病理 宏观经济学
作者
Hajar Bellefqih,Véronique Bourgier,Essaïd Bilal,Delia-Georgeta Dumitraș,Ştefan Marincea,Hamid Mazouz,Nils Haneklaus
出处
期刊:Journal of Cleaner Production [Elsevier BV]
卷期号:451: 142013-142013 被引量:11
标识
DOI:10.1016/j.jclepro.2024.142013
摘要

The implementation of a sustainable development strategy holds the potential to enhance productivity, profitability, and overall efficiency by leveraging by-products from other industries. In plaster manufacturing the substitution of natural gypsum with synthetic gypsum is worth exploring. Phosphogypsum (PG) represents a significant fraction of synthetic gypsum production, arising as a by-product of phosphoric acid manufacturing. However, the presence of impurities in PG, particularly phosphorus, poses challenges to its use as a plaster material. To identify the phases present in PG, quantify their occurrences and understand their effects on dehydration and hydration processes, our study aimed to examine simplified models. These models are specifically designed to provide insights into the underlying mechanisms governing the hydration reactivity of hemihydrate. Pure gypsum and brushite were synthesized, and mechanical mixing was carried out to explore how brushite affects the characteristics of gypsum. Additionally, a solid solution of Ca(SO4)1-x(HPO4)x·2H2O, where 0 < x < 1, was prepared to characterize and quantify the syncrystallized HPO42− as well as the effects of this impurity on typical gypsum use cases. The synthesized materials underwent physical and chemical characterization using SEM, XRD, IR spectroscopy, DSC, pH and conductivity measurements, and ion chromatography. The results demonstrated that the HPO42− ions can substitute for sulfate ions in gypsum to form solid solutions. The maximum quantity of HPO42− ions in the gypsum lattice is approximately 10%, leading to the crystallization of gypsum into sand rose shape rather than needle crystals. As the concentration of HPO42− ions increases, a new phase known as ardealite (Ca(SO4)1-x(HPO4)x·2H2O) with 0.42 < x < 0.54 emerges, followed by brushite (CaHPO4·2H2O). During the calcination of brushite at 160 °C, a mixture of brushite and monetite formed that exhibits different properties compared to its natural counterpart. In the presence of syncrystallized HPO42− ions, the transformation from anhydrite III to anhydrite II occurred at higher temperatures than for pure gypsum. The reactivity of calcined samples indicate that HPO42− ions from the dehydration products of brushite caused a delay in hydration, with the maximum delay observed at a calcination temperature of 160 °C. At this temperature, monetite begins to crystallize, and it is characterized by its inert nature, exhibiting no reactivity with water. This explains the observed decrease in setting times as the calcination temperature rises. Moreover, syncrystallized HPO42− ions induced a significant delay in the hydration process. Our research revealed that adjusting the calcination temperature can mitigate the retarding effect associated with this impurity, suggesting an industrial tendency to use the lowest possible temperature during the calcination process of PG containing syncrystallized phosphate impurity. In addition, we have observed that adjusting the pH of the mixing water to lower values can significantly accelerate setting times.

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
猪八戒完成签到 ,获得积分10
刚刚
能干的水池完成签到,获得积分10
4秒前
诚心的傲芙完成签到,获得积分10
8秒前
onlyone应助Nan采纳,获得30
10秒前
木子26年要毕业完成签到 ,获得积分10
10秒前
小事完成签到 ,获得积分10
13秒前
张顾伟完成签到 ,获得积分10
13秒前
橙啊程完成签到,获得积分10
14秒前
19秒前
热情铭完成签到,获得积分10
20秒前
21秒前
半斤完成签到 ,获得积分10
21秒前
Lucas应助科研通管家采纳,获得10
21秒前
ding应助科研通管家采纳,获得10
21秒前
丘比特应助科研通管家采纳,获得10
21秒前
21秒前
慕青应助科研通管家采纳,获得10
21秒前
大模型应助科研通管家采纳,获得10
22秒前
所所应助科研通管家采纳,获得80
22秒前
22秒前
李健应助科研通管家采纳,获得10
22秒前
CAOHOU应助科研通管家采纳,获得10
22秒前
22秒前
李爱国应助科研通管家采纳,获得10
22秒前
22秒前
卫来发布了新的文献求助10
25秒前
zhenggc完成签到 ,获得积分10
26秒前
流年亦梦完成签到 ,获得积分10
27秒前
masheng发布了新的文献求助10
27秒前
崔志海完成签到,获得积分10
29秒前
flysky120完成签到,获得积分10
30秒前
帅气一刀发布了新的文献求助10
30秒前
zhenggc关注了科研通微信公众号
33秒前
iiiya关注了科研通微信公众号
35秒前
FashionBoy应助masheng采纳,获得10
35秒前
卫来完成签到,获得积分20
36秒前
帅气一刀完成签到,获得积分10
37秒前
Zachary完成签到 ,获得积分10
39秒前
过时的服饰完成签到,获得积分20
40秒前
CipherSage应助积极书双采纳,获得10
44秒前
高分求助中
(禁止应助)【重要!!请各位详细阅读】【科研通的精品贴汇总】 10000
Diagnostic Imaging: Pediatric Neuroradiology 2000
Semantics for Latin: An Introduction 1099
Biology of the Indian Stingless Bee: Tetragonula iridipennis Smith 1000
Robot-supported joining of reinforcement textiles with one-sided sewing heads 720
Thermal Quadrupoles: Solving the Heat Equation through Integral Transforms 500
SPSS for Windows Step by Step: A Simple Study Guide and Reference, 17.0 Update (10th Edition) 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 4132512
求助须知:如何正确求助?哪些是违规求助? 3669181
关于积分的说明 11603503
捐赠科研通 3366193
什么是DOI,文献DOI怎么找? 1849371
邀请新用户注册赠送积分活动 913050
科研通“疑难数据库(出版商)”最低求助积分说明 828413