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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for preparing high-strength alpha-calcium sulfate hemihydrate from flue gas desulfurization gypsum
The invention relates to the technical field of industrial solid waste recovery, and discloses a method for preparing high-strength alpha-semi-hydrated gypsum (calcium sulfate) from flue gas desulfurization gypsum, which comprises the following steps: 1) removing harmful impurities such as calcium sulfite, iron and the like in the flue gas desulfurization gypsum by a hydrothermal acid method; and 2) adding a compound crystal modifier, and carrying out hydrothermal catalytic conversion to obtain the high-strength alpha-calcium sulfate hemihydrate. The alpha-type calcium sulfate hemihydrate (gypsum) obtained by the method is short-column-shaped and high in density, the average particle size is about 50 microns, the breaking strength can reach 6.5 MPa or above, and the compressive strength can reach 54.5 MPa or above.
本发明涉及工业固废回收技术领域，公开了一种从烟气脱硫石膏制备高强度α‑半水石膏(硫酸钙)的方法，包括以下步骤：1)首先通过水热酸法除去烟气脱硫石膏中的亚硫酸钙、铁等有害杂质；2)再通过添加复配转晶剂，水热催化转化为高强度的α‑半水硫酸钙。本发明所得产品α型半水硫酸钙(石膏)为短柱状高密度，平均粒度50μm左右，其抗折强度可高达6.5MPa以上，抗压强度达54.5MPa以上。
Method for preparing high-strength alpha-calcium sulfate hemihydrate from flue gas desulfurization gypsum
The invention relates to the technical field of industrial solid waste recovery, and discloses a method for preparing high-strength alpha-semi-hydrated gypsum (calcium sulfate) from flue gas desulfurization gypsum, which comprises the following steps: 1) removing harmful impurities such as calcium sulfite, iron and the like in the flue gas desulfurization gypsum by a hydrothermal acid method; and 2) adding a compound crystal modifier, and carrying out hydrothermal catalytic conversion to obtain the high-strength alpha-calcium sulfate hemihydrate. The alpha-type calcium sulfate hemihydrate (gypsum) obtained by the method is short-column-shaped and high in density, the average particle size is about 50 microns, the breaking strength can reach 6.5 MPa or above, and the compressive strength can reach 54.5 MPa or above.
本发明涉及工业固废回收技术领域，公开了一种从烟气脱硫石膏制备高强度α‑半水石膏(硫酸钙)的方法，包括以下步骤：1)首先通过水热酸法除去烟气脱硫石膏中的亚硫酸钙、铁等有害杂质；2)再通过添加复配转晶剂，水热催化转化为高强度的α‑半水硫酸钙。本发明所得产品α型半水硫酸钙(石膏)为短柱状高密度，平均粒度50μm左右，其抗折强度可高达6.5MPa以上，抗压强度达54.5MPa以上。
Method for preparing high-strength alpha-calcium sulfate hemihydrate from flue gas desulfurization gypsum
一种从烟气脱硫石膏制备高强度α-半水硫酸钙的方法
YANG WEIJUN (Autor:in) / LI XINHAO (Autor:in) / YU CHANGYONG (Autor:in) / WANG XIN (Autor:in)
01.03.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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