Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for preparing type II anhydrous gypsum by fluidizing and roasting beta-semi-hydrated gypsum
The invention discloses a method for preparing type II anhydrous gypsum by fluidizing and roasting beta-semi-hydrated gypsum, which comprises the following steps: step 1, fluidizing and roasting beta-semi-hydrated gypsum powder in a small fluidized bed, keeping the gas-solid ratio at 0.2320-0.2680 L.( g.min)-1, and controlling the heating rate at 5-15 DEG C/min; 2, when the temperature of a roasting furnace is increased to 700-900 DEG C, carrying out heat preservation for 100-200 min; 3, after the heat preservation stage is finished, naturally cooling to normal temperature, and taking out the gypsum. According to the method, efficient mass transfer and heat transfer of the fluidized bed are utilized, the roasting efficiency is improved, and the content of the II-type anhydrous gypsum can reach 85% or above; impurities can be removed through high-temperature fluidized roasting, and the quality of the II-type anhydrous phosphogypsum subjected to high-temperature roasting is slightly influenced by the impurities.
本发明公开了一种由β‑半水石膏流化焙烧制备Ⅱ型无水石膏的方法，包括以下步骤，步骤一、将β‑半水石膏粉在小型流化床中进行流化焙烧，气固比保持在0.2320～0.2680L·(g·min)‑1，控制加热速率为5～15℃/min；步骤二、焙烧炉升温至700～900℃时保温100～200min；步骤三：保温阶段结束后，自然冷却至常温取出石膏。本发明利用了流化床高效的传质和传热，提高了焙烧效率，Ⅱ型无水石膏含量可达在85％以上；通过高温流化焙烧可以去除其中的杂质，高温焙烧后的Ⅱ型无水磷石膏其质量受杂质的影响很小。
Method for preparing type II anhydrous gypsum by fluidizing and roasting beta-semi-hydrated gypsum
The invention discloses a method for preparing type II anhydrous gypsum by fluidizing and roasting beta-semi-hydrated gypsum, which comprises the following steps: step 1, fluidizing and roasting beta-semi-hydrated gypsum powder in a small fluidized bed, keeping the gas-solid ratio at 0.2320-0.2680 L.( g.min)-1, and controlling the heating rate at 5-15 DEG C/min; 2, when the temperature of a roasting furnace is increased to 700-900 DEG C, carrying out heat preservation for 100-200 min; 3, after the heat preservation stage is finished, naturally cooling to normal temperature, and taking out the gypsum. According to the method, efficient mass transfer and heat transfer of the fluidized bed are utilized, the roasting efficiency is improved, and the content of the II-type anhydrous gypsum can reach 85% or above; impurities can be removed through high-temperature fluidized roasting, and the quality of the II-type anhydrous phosphogypsum subjected to high-temperature roasting is slightly influenced by the impurities.
本发明公开了一种由β‑半水石膏流化焙烧制备Ⅱ型无水石膏的方法，包括以下步骤，步骤一、将β‑半水石膏粉在小型流化床中进行流化焙烧，气固比保持在0.2320～0.2680L·(g·min)‑1，控制加热速率为5～15℃/min；步骤二、焙烧炉升温至700～900℃时保温100～200min；步骤三：保温阶段结束后，自然冷却至常温取出石膏。本发明利用了流化床高效的传质和传热，提高了焙烧效率，Ⅱ型无水石膏含量可达在85％以上；通过高温流化焙烧可以去除其中的杂质，高温焙烧后的Ⅱ型无水磷石膏其质量受杂质的影响很小。
Method for preparing type II anhydrous gypsum by fluidizing and roasting beta-semi-hydrated gypsum
一种由β-半水石膏流化焙烧制备Ⅱ型无水石膏的方法
MA LIPING (Autor:in) / DU WANG (Autor:in) / XIONG XIONG (Autor:in) / PAN QINGHUAN (Autor:in) / QING SANCHENG (Autor:in) / YIN XIA (Autor:in) / AO RAN (Autor:in) / GUO ZHIYING (Autor:in) / MU LIUSEN (Autor:in) / WANG YUE (Autor:in)
23.07.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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