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Method for preparing alpha-type high-strength gypsum from desulfurized gypsum
The invention belongs to the technical field of material preparation, and particularly relates to a method for preparing alpha-type high-strength gypsum from desulfurized gypsum. According to the method, the utilization rate and utilization value of the desulfurization gypsum are improved, and resource waste and environmental pollution caused by accumulation and landfill of the desulfurization gypsum are relieved. The method comprises the following steps: carrying out water washing pretreatment on the desulfurized gypsum for three times, drying, and additionally adding lime accounting for 1% of the mass of the desulfurized gypsum during the third pretreatment; adding a solution containing a crystal modifier into the pretreated flue gas desulfurization gypsum, and uniformly mixing, wherein the mass of the crystal modifier aluminum sulfate and the mass of the water are 0.08-0.12 wt% and 10-15 wt% of the dry basis weight of the flue gas desulfurization gypsum respectively; performing double-sided pressing on the obtained mixture by a pressing machine under the pressure of 20 Mpa, putting the pressed mixture into an autoclave, performing autoclaving for 8-10 hours under the conditions of 150 DEG C and 1.4 Mpa, immediately drying at 100 DEG C, and then grinding to obtain the high-quality alpha-type high-strength gypsum with the whiteness of 70% and the strength of alpha30.
本发明属于材料制备技术领域，具体涉及一种将脱硫石膏制备为α型高强石膏的方法。该方法提高了脱硫石膏利用率及利用价值，缓解脱硫石膏堆积填埋带来的资源浪费及环境污染。其方法将脱硫石膏进行3次水洗预处理后烘干，在第3次预处理时额外加入脱硫石膏质量1%的石灰；预处理后的脱硫石膏中加入含转晶剂的溶液混合均匀，其中转晶剂硫酸铝与水质量分别为脱硫石膏干基重量的0.08‑0.12 wt％和10‑15 wt％；将得到的混合物再以压制机在20 Mpa压力下双面压制后放入蒸压釜在150℃、1.4 Mpa的条件下蒸压8‑10 h后立即在100℃下烘干，然后粉磨后得到白度达70%、强度达α30的优质α型高强石膏。
Method for preparing alpha-type high-strength gypsum from desulfurized gypsum
The invention belongs to the technical field of material preparation, and particularly relates to a method for preparing alpha-type high-strength gypsum from desulfurized gypsum. According to the method, the utilization rate and utilization value of the desulfurization gypsum are improved, and resource waste and environmental pollution caused by accumulation and landfill of the desulfurization gypsum are relieved. The method comprises the following steps: carrying out water washing pretreatment on the desulfurized gypsum for three times, drying, and additionally adding lime accounting for 1% of the mass of the desulfurized gypsum during the third pretreatment; adding a solution containing a crystal modifier into the pretreated flue gas desulfurization gypsum, and uniformly mixing, wherein the mass of the crystal modifier aluminum sulfate and the mass of the water are 0.08-0.12 wt% and 10-15 wt% of the dry basis weight of the flue gas desulfurization gypsum respectively; performing double-sided pressing on the obtained mixture by a pressing machine under the pressure of 20 Mpa, putting the pressed mixture into an autoclave, performing autoclaving for 8-10 hours under the conditions of 150 DEG C and 1.4 Mpa, immediately drying at 100 DEG C, and then grinding to obtain the high-quality alpha-type high-strength gypsum with the whiteness of 70% and the strength of alpha30.
本发明属于材料制备技术领域，具体涉及一种将脱硫石膏制备为α型高强石膏的方法。该方法提高了脱硫石膏利用率及利用价值，缓解脱硫石膏堆积填埋带来的资源浪费及环境污染。其方法将脱硫石膏进行3次水洗预处理后烘干，在第3次预处理时额外加入脱硫石膏质量1%的石灰；预处理后的脱硫石膏中加入含转晶剂的溶液混合均匀，其中转晶剂硫酸铝与水质量分别为脱硫石膏干基重量的0.08‑0.12 wt％和10‑15 wt％；将得到的混合物再以压制机在20 Mpa压力下双面压制后放入蒸压釜在150℃、1.4 Mpa的条件下蒸压8‑10 h后立即在100℃下烘干，然后粉磨后得到白度达70%、强度达α30的优质α型高强石膏。
Method for preparing alpha-type high-strength gypsum from desulfurized gypsum
一种将脱硫石膏制备为α型高强石膏的方法
HUANG WEI (author) / CAO YONGGANG (author) / ZHANG ZILONG (author) / XUE KUI (author) / WANG JIALIANG (author)
2024-06-14
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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