脱硫石膏掺杂氧化锌转晶制备高性能建筑石膏

doi:10.19964/j.issn.1006-4990.2021-0595

Abstract

Abstract:

The mass preparation of building gypsum from desulfurization gypsum after heat treatment not only alleviates environmental pollution problems，but also has certain economic benefits.High?performance building gypsum was prepared by using desulfurization gypsum from power plant as raw material and adding ZnO as crystal transformation adjuvant to adjust the crystal structure of calcined products of desulfurization gypsum through heat treatment.And the effects of ZnO content and calcination temperature on the properties of building gypsum were studied.The results showed that the addition of ZnO broadened the temperature range for calcining desulfurization gypsum into hemihydrate gypsum，and also improved the crystallinity of calcined products.By adding 0.6% ZnO（calculated by mass fraction） to desulfurization gypsum，the performance of building gypsum calcined at 180 ℃ was the best.The morphology of products with hydration of 2 h was needle?like or fibrous crystals that were stacked with each other.The flexural and compressive strengths reached 3.8 MPa and 9.2 MPa at 2 h，respectively，meeting the standard requirements of grade 3.0 of building gypsum.It could realize the large?scale resource utilization of desulfurization gypsum to prepare high?performance building gypsum.

Key words: desulfurization gypsum, ZnO, heat treatment, high?performance building gypsum

CLC Number:

TQ177.3

HAO Jianying,HU Tao,CHENG Guanji,GUO Bing. Preparation of high?performance building gypsum by desulfurization gypsum doped with ZnO crystal transformation[J]. Inorganic Chemicals Industry, 2022, 54(6): 96-101.

Figures/Tables 7

Table 1

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项目	质量分数/%	项目	质量分数/%
CaO	32.41	Fe₂O₃	0.35
SO₃	42.64	SiO₂	2.26
Al₂O₃	0.83	附着水	11.94
MgO	0.27	结晶水	18.92

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Preparation of high?performance building gypsum by desulfurization gypsum doped with ZnO crystal transformation

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