Unraveling a Sustainable Process for the Production of High-Strength α-Gypsum Using Soda Residues and H2SO4
Unraveling a Sustainable Process for the Production of High-Strength α-Gypsum Using Soda Residues and H2SO4
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揭示使用苏打残渣和 H2SO4 生产高强度α-石膏的可持续工艺
DOI：
10.1021/acs.iecr.0c03305
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发表时间：
2020-08
影响因子：
4.2
通讯作者：
Zhibao Li
中科院分区：
文献类型：
--
作者：
Qiaoxin Wang;Xia Liu;Zhibao Li
为了提高人们对纯碱废渣的认识，改进传统的纯碱废渣处理方法，本文提出了一种制备高强度CaSO_4·0.5H_2 O（α-石膏）的新方法。该方法包括两个步骤：（1）利用排碱残渣和H2SO 4制备二水CaSO 4·2 H2O（DH）;（2）在368 K下，在添加剂的混合溶液中将DH转化为α-石膏。为了降低排放液中的铁含量，采取了一个关键步骤。研究了含CaSO 4的固-液体系的热力学性质和相变机理。所获得的粗苏打残余物的组成，主要含有CaCO 3。（约60%），进行了量化。研究了以下参数对所得CaSO 4·2 H2O晶体的影响：反应时间（1.5 - 3 h）、温度（333-.353 K）、污泥固/液比（1：2 - 1：4）、酸浓度（0.95 - 2.54 mol/L）和晶种添加量（5 - 10%）。考察了对颗粒尺寸和形态结构演变的显著影响。所生产的α-石膏晶体具有拉长的棱柱或球形结构，由于其优异的可注射性和高的抗压强度而非常有利。由这些实验得出的最佳工艺条件可用于真实的工业设计和α-石膏的工业放大生产。
To advance the state of knowledge and the conventional method of.processing soda residues/sludges, this work presents a novel design for the preparation of.high-strength CaSO4·0.5H2O (a-gypsum). The two steps included are to (1) produce.CaSO4·2H2O (dihydrate, DH) using the discharged soda residues and H2SO4 and (2).transform DH into a-gypsum in a mixed solution with additives at 368 K. A critical step was.included to reduce the iron content of the discharged liquor. Thermodynamic properties and.phase transition mechanisms were investigated for the solid−liquid systems that involve.CaSO4. The composition of the obtained raw soda residues, containing mostly CaCO3.(∼60%), was quantified. The influence of the following parameters was studied on the.obtained CaSO4·2H2O crystals: the duration of the reaction (1.5−3 h), temperature (333−.353 K), solid/liquid ratio of sludge (1:2−1:4), concentration of acids (0.95−2.54 mol/L),.and amount of seeded crystals added (5−10%). Marked effects on the evolution of particle.sizes and morphological structures were examined. The produced a-gypsum crystals possess.an elongated-prismatic or spherical structure, much favored for their excellent injectability and high compressive strength. The most.optimal conditions deduced from these experiments can be applied to aid in real industrial design and for the scale-up of the mass.production of a-gypsum.
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影响因子：
4.2
作者：
Yifan Wu;Heping Xie;Tao Liu;Yufei Wang;Fuhuan Wang;Xiaolin Gao;Bin Liang
通讯作者：
Yifan Wu;Heping Xie;Tao Liu;Yufei Wang;Fuhuan Wang;Xiaolin Gao;Bin Liang
DOI：
10.1017/cbo9781107280427.008
发表时间：
2015
期刊：
--
影响因子：
--
作者：
A. Lewis;M. Seckler;H. Kramer;G. V. Rosmalen
通讯作者：
A. Lewis;M. Seckler;H. Kramer;G. V. Rosmalen
影响因子：
--
作者：
K. Staszak;K. Wieszczycka
通讯作者：
K. Staszak;K. Wieszczycka
DOI：
10.1021/je050217e
发表时间：
2005-11-01
期刊：
JOURNAL OF CHEMICAL AND ENGINEERING DATA
影响因子：
--
作者：
Li, ZB;Demopoulos, GP
通讯作者：
Demopoulos, GP
影响因子：
3.7
作者：
Hossain, Nazir;Ravichandran, Ashwin;Chen, Chau-Chyun
通讯作者：
Chen, Chau-Chyun