A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Method for curing secondary aluminum ash by using desulfurized gypsum and calcining device
The invention discloses a method for curing secondary aluminum ash by using desulfurized gypsum and a calcining device. The method comprises the following steps: S1, calcining the desulfurized gypsum to obtain gypsum clinker; s2, red mud, secondary aluminum ash and water are mixed to prepare slurry A; s3, carrying out filter pressing on the slurry A, and then adding furnace bottom ash to prepare slurry B; s4, uniformly mixing gypsum clinker with K2SO4 or Na2SO4, adding the mixture into the slurry B, and uniformly mixing to obtain slurry C; and S5, molding the slurry C into a cured body. The desulfurized gypsum provided by the invention is calcined at high temperature to generate anhydrous gypsum, has excellent strength, bonding performance and water resistance, and can firmly solidify secondary aluminum ash together to reduce erosion and permeation of external water to the aluminum ash; k2SO4 or Na2SO4 shortens the coagulation time of the slurry and improves the strength of the slurry; after the red mud and the aluminum ash are mixed in the water, alkaline substances released from the red mud can promote hydrolysis of AlN and metal Al in the secondary aluminum ash, so that the water reactivity of the secondary aluminum ash can be eliminated, and spontaneous combustion and harmful gas release after the aluminum ash is buried are prevented.
本发明公开了一种利用脱硫石膏固化二次铝灰的方法和煅烧装置，包括如下步骤：S1.将脱硫石膏煅烧制得石膏熟料；S2.将赤泥、二次铝灰、水混合制得料浆A；S3.将料浆A压滤后加入炉底灰，制得料浆B；S4.将石膏熟料与K2SO4或Na2SO4混匀，加入料浆B中混匀制得料浆C；S5.将料浆C成型为固化体。本申请的脱硫石膏经过高温煅烧生成无水石膏，具备优异的强度、粘结和耐水性能，可将二次铝灰牢牢固化在一起，减小外界水对铝灰的侵蚀渗透；K2SO4或Na2SO4缩短料浆的凝结时间，并提高其强度；赤泥与铝灰在水中混合后，赤泥中释放的碱性物质可促进二次铝灰中AlN和金属Al的水解，从而可以消除二次铝灰的水反应性，防止铝灰填埋后发生自燃以及释放有害气体。
Method for curing secondary aluminum ash by using desulfurized gypsum and calcining device
The invention discloses a method for curing secondary aluminum ash by using desulfurized gypsum and a calcining device. The method comprises the following steps: S1, calcining the desulfurized gypsum to obtain gypsum clinker; s2, red mud, secondary aluminum ash and water are mixed to prepare slurry A; s3, carrying out filter pressing on the slurry A, and then adding furnace bottom ash to prepare slurry B; s4, uniformly mixing gypsum clinker with K2SO4 or Na2SO4, adding the mixture into the slurry B, and uniformly mixing to obtain slurry C; and S5, molding the slurry C into a cured body. The desulfurized gypsum provided by the invention is calcined at high temperature to generate anhydrous gypsum, has excellent strength, bonding performance and water resistance, and can firmly solidify secondary aluminum ash together to reduce erosion and permeation of external water to the aluminum ash; k2SO4 or Na2SO4 shortens the coagulation time of the slurry and improves the strength of the slurry; after the red mud and the aluminum ash are mixed in the water, alkaline substances released from the red mud can promote hydrolysis of AlN and metal Al in the secondary aluminum ash, so that the water reactivity of the secondary aluminum ash can be eliminated, and spontaneous combustion and harmful gas release after the aluminum ash is buried are prevented.
本发明公开了一种利用脱硫石膏固化二次铝灰的方法和煅烧装置，包括如下步骤：S1.将脱硫石膏煅烧制得石膏熟料；S2.将赤泥、二次铝灰、水混合制得料浆A；S3.将料浆A压滤后加入炉底灰，制得料浆B；S4.将石膏熟料与K2SO4或Na2SO4混匀，加入料浆B中混匀制得料浆C；S5.将料浆C成型为固化体。本申请的脱硫石膏经过高温煅烧生成无水石膏，具备优异的强度、粘结和耐水性能，可将二次铝灰牢牢固化在一起，减小外界水对铝灰的侵蚀渗透；K2SO4或Na2SO4缩短料浆的凝结时间，并提高其强度；赤泥与铝灰在水中混合后，赤泥中释放的碱性物质可促进二次铝灰中AlN和金属Al的水解，从而可以消除二次铝灰的水反应性，防止铝灰填埋后发生自燃以及释放有害气体。
Method for curing secondary aluminum ash by using desulfurized gypsum and calcining device
一种利用脱硫石膏固化二次铝灰的方法和煅烧装置
ZHANG YUANXIN (author) / QIU ZHONGCHENG (author) / PAN JINFENG (author) / XU ZHAO (author) / YANG KEBING (author) / REN XIAONI (author)
2023-08-22
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
Auxiliary energy-saving method and device for desulfurized gypsum calcining furnace
| European Patent Office | 2024