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A platform for research: civil engineering, architecture and urbanism
Phosphogypsum circulating fluidized bed reduction roasting comprehensive utilization process and device thereof
The invention discloses a phosphogypsum circulating fluidized bed reduction roasting comprehensive utilization process and a device thereof. The device comprises a circulating fluidized bed reactor body provided with a slag discharging opening. An air inlet is formed in the bottom of the circulating fluidized bed reactor. A coal feeding hole, a phosphogypsum/mineral mixture inlet, a circulating material inlet and a secondary air inlet are respectively formed in the lower part of a dense-phase zone; a flue gas outlet is formed in the top of the circulating fluidized bed reactor; a primary cyclone separator is connected with a circulating material inlet and a first-stage fluidized bed cooling device; a flue gas outlet of the primary cyclone separator is connected with a secondary cyclone separator; the lower portion of a second-stage separator is connected with the first-stage fluidized bed cooling device; a flue gas outlet of the secondary cyclone separator is connected with a third-stage cyclone separator; the lower portion of the third-stage cyclone separator is connected with a second-stage fluidized bed cooling device; and meanwhile the first-stage fluidized bed cooling device is connected with the second-stage fluidized bed cooling device. The invention aims to realize activation of a phosphogypsum/tailing mixture under a reduction roasting condition at a temperature of about 850 DEG C by blending phosphogypsum/tailing mixed raw material components. Therefore, the efficient roasting technology and the device are the key to efficient and clean utilization of the phosphogypsum/tailings mixed raw materials. On the other hand, semi-hydrated gypsum is a good building material and has a good application market at present. Therefore, the application value of the phosphogypsum can also be improved by making the existing water-containing gypsum into the semi-hydrated gypsum through processes such as drying and the like.
本发明公开了一种磷石膏循环流化床还原焙烧综合利用工艺及装置，包括设有排渣口的循环流化床反应器所述循环流化床反应器底部设有空气入口，在密相区下部分别设有煤炭给入口、磷石膏/矿物混合料入口、循环物料入口以及二次风入口，循环流化床反应器顶部设有烟气出口，经一级旋风分离器与循环物料入口和一级流化床冷却装置连接，一级旋风分离器烟气出口与二级旋风分离器连接，二级分离器下部与一级流化床冷却装置连接，二级旋风分离器烟气出口与三级旋风分离器连接，三级旋风分离器下部与二级流化床冷却装置连接，同时一级流化床冷却装置与二级流化床冷却装置连接。本发明的目的在于通过调配磷石膏/尾矿混合原料组分，可实现在850℃左右温度的还原焙烧条件下可活化将磷石膏/尾矿混合料。因此高效的焙烧技术及装置是实现磷石膏/尾矿混合原料高效清洁利用的关键。另一方面，半水石膏是一种较好的建筑材料，目前具有较好的应用市场。因此将目前的含水石膏通过烘干等工艺制成半水石膏同样可以提高磷石膏的应用价值。
Phosphogypsum circulating fluidized bed reduction roasting comprehensive utilization process and device thereof
The invention discloses a phosphogypsum circulating fluidized bed reduction roasting comprehensive utilization process and a device thereof. The device comprises a circulating fluidized bed reactor body provided with a slag discharging opening. An air inlet is formed in the bottom of the circulating fluidized bed reactor. A coal feeding hole, a phosphogypsum/mineral mixture inlet, a circulating material inlet and a secondary air inlet are respectively formed in the lower part of a dense-phase zone; a flue gas outlet is formed in the top of the circulating fluidized bed reactor; a primary cyclone separator is connected with a circulating material inlet and a first-stage fluidized bed cooling device; a flue gas outlet of the primary cyclone separator is connected with a secondary cyclone separator; the lower portion of a second-stage separator is connected with the first-stage fluidized bed cooling device; a flue gas outlet of the secondary cyclone separator is connected with a third-stage cyclone separator; the lower portion of the third-stage cyclone separator is connected with a second-stage fluidized bed cooling device; and meanwhile the first-stage fluidized bed cooling device is connected with the second-stage fluidized bed cooling device. The invention aims to realize activation of a phosphogypsum/tailing mixture under a reduction roasting condition at a temperature of about 850 DEG C by blending phosphogypsum/tailing mixed raw material components. Therefore, the efficient roasting technology and the device are the key to efficient and clean utilization of the phosphogypsum/tailings mixed raw materials. On the other hand, semi-hydrated gypsum is a good building material and has a good application market at present. Therefore, the application value of the phosphogypsum can also be improved by making the existing water-containing gypsum into the semi-hydrated gypsum through processes such as drying and the like.
本发明公开了一种磷石膏循环流化床还原焙烧综合利用工艺及装置，包括设有排渣口的循环流化床反应器所述循环流化床反应器底部设有空气入口，在密相区下部分别设有煤炭给入口、磷石膏/矿物混合料入口、循环物料入口以及二次风入口，循环流化床反应器顶部设有烟气出口，经一级旋风分离器与循环物料入口和一级流化床冷却装置连接，一级旋风分离器烟气出口与二级旋风分离器连接，二级分离器下部与一级流化床冷却装置连接，二级旋风分离器烟气出口与三级旋风分离器连接，三级旋风分离器下部与二级流化床冷却装置连接，同时一级流化床冷却装置与二级流化床冷却装置连接。本发明的目的在于通过调配磷石膏/尾矿混合原料组分，可实现在850℃左右温度的还原焙烧条件下可活化将磷石膏/尾矿混合料。因此高效的焙烧技术及装置是实现磷石膏/尾矿混合原料高效清洁利用的关键。另一方面，半水石膏是一种较好的建筑材料，目前具有较好的应用市场。因此将目前的含水石膏通过烘干等工艺制成半水石膏同样可以提高磷石膏的应用价值。
Phosphogypsum circulating fluidized bed reduction roasting comprehensive utilization process and device thereof
磷石膏循环流化床还原焙烧综合利用工艺及装置
WANG QINHUI (author) / TANG YUN (author) / CHE JIANQING (author)
2020-07-07
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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