Characteristic and structure of calcium sulfate dihydrate crystallites in crystallization process during reaction

DOU Yan; LIU Tonghai; SHEN Hao; ZHENG Zhiyin; LIU Rong; CUI Peng

doi:10.11949/j.issn.0438-1157.20151942

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Characteristic and structure of calcium sulfate dihydrate crystallites in crystallization process during reaction

更新时间：2025-11-26

- Characteristic and structure of calcium sulfate dihydrate crystallites in crystallization process during reaction
- CIESC Journal Issue 6, Pages: 2449-2455(2016)
- 作者机构：
  
  1. 合肥工业大学化学与化工学院,安徽,合肥,230009
  2. 安徽六国化工股份有限公司,安徽,铜陵,244000
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20151942
  CLC： Q177.372
- Online First：05 June 2016，
  
  Published：05 June 2016
- 稿件说明：
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DOU Yan, LIU Tonghai, SHEN Hao, et al. Characteristic and structure of calcium sulfate dihydrate crystallites in crystallization process during reaction[J]. CIESC Journal, 2016, (6): 2449-2455.
DOI：

DOU Yan, LIU Tonghai, SHEN Hao, et al. Characteristic and structure of calcium sulfate dihydrate crystallites in crystallization process during reaction[J]. CIESC Journal, 2016, (6): 2449-2455. DOI： 10.11949/j.issn.0438-1157.20151942.

摘要

设计了CaHPO4·2H2O-H2SO4-H3PO4-H2O体系结晶温度、液相SO42-含量、液相P2O5含量、搅拌速率和结晶时间的五因素四水平正交实验

通过测量晶体平均粒径优化出平均粒径最大的工艺参数:结晶温度80℃、液相SO42-含量50g·L-1、液相P2O5含量260g·L-1、搅拌速率50r·min-1和结晶时间2h。在该工艺参数下进行结晶过程研究

通过分析液相SO42-浓度和P2O5浓度

XRD、SEM、EDS和激光粒度分析仪表征晶体

研究发现:0~40min为反应阶段

平均粒径减小;40min之后结晶过程遵从Ostwald递变法则

从CaSO4·0.5H2O过渡到CaSO4·2H2O

平均粒径几乎不变。

Abstract

In CaHPO4·2H2O-H2SO4-H3PO4-H2O system

an orthogonal experiment with five factors and four levels

including crystallization temperature

SO42- concentration and P2O5 concentration in liquid phase (solution)

stirring rate and crystallization time was designed. Based on the measurement of average particle size

the optimized process parameters for the maximum mean particle size are

80℃ of crystallization temperature

50 g·L-1 of SO42- concentration

260 g·L-1 of P2O5 concentration

50 r·min-1 of stirring speed

and 2 h of crystallization time. Under the optimum conditions of the crystallization process

by means of analyses on the concentrations of SO42- and P2O5 in solution

and the techniques of XRD

SEM

EDS and laser particle size measurement

it showed that the reaction stage was the first 40 min with a decrease in mean particle size

and after 40 min

the procedure of crystallization follows the Ostwald grading rules

along with the evolution from CaSO4·0.5H2O to CaSO4·2H2O

but with almost identical particle size.

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