Circulating fluidized bed mineral reducing roasting device and reducing roasting method
A circulating fluidized bed and roasting device technology, which is applied in the field of inorganic mineral reduction roasting, can solve the problems of low product yield and quality, high energy consumption, and large amount of analyzed fly ash, so as to achieve reliable operation of equipment and excellent operating environment. Improve and improve the effect of production index
Inactive Publication Date: 2006-02-01
南京东大能源环保科技有限公司
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Problems solved by technology
The process uses a common fluidized bed roaster. Due to the large amount of analyzed fly ash and the low reduction rate, the product yield and quality are low, and the energy consumption remains high. For example, the improvement of the reduction rate is limited if the raw materials are roasted after granulation, but cost increased
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[0026] Embodiments of the present invention are described below with reference to the accompanying drawings.
[0027] The pretreated ore is controlled to have a particle size of ≤2mm, lifted to the mine hopper 1, and sent to the fluidization section 5 of the roaster by the speed-regulating screw 3, and the raw coal particle size is screened to ≤10mm, lifted to the coal hopper 2, and sent into the coal hopper 2 by the speed-regulating screw 4 The fluidization section 5 of the roasting furnace, the weight ratio of ore and coal is 1.5 to 1.65, the combustion air is provided by the blower 17, the heat is recovered by the gas-gas heat exchanger 16, and then sent from the bellows 7 at the bottom of the roasting furnace, and enters the roasting through the air distribution plate 6 Furnace fluidization section 5, where the coal is incompletely burned, the temperature in the bed is controlled at 900-935°C, and the apparent reaction time is 1.3-1.5 hours. The analyzed fly ash carried in...
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The present invention relates to apparatus and process of reducing and roasting inorganic mineral in circular fluidized bed. The reducing and roasting process includes feeding the pretreated ore and coal material into the fluidizing section of the roasting furnace; providing burning air with the blower via the air chest and grid plate to the fluidizing section of the roasting furnace; collecting the flyash with the medium temperature insulating deduster from the exhaust of the roasting furnace and returning the flyash via the vertical pipe, the J-valve and the returning pipe to the fluidized bed; heat exchange of the exhaust from the medium temperature insulating deduster in the gas-gas heat exchanger to lower the temperature to 110-150 deg.c and further dedusting in bag deduster before exhausting; and discharging the roasted material via the side overflow pipe to the chamotte storage.
Description
technical field [0001] The invention relates to a reduction roasting device and a reduction roasting method for inorganic minerals in a circulating fluidized bed, belonging to the technical field of reduction roasting of inorganic minerals. Background technique [0002] Usually, inorganic salt products (such as strontium carbonate and barium carbonate, etc.) are made from natural minerals through processes such as ore pretreatment, roasting, leaching and carbonization, among which roasting is the key to its production. For example, strontium carbonate produced by carbon reduction method using celestite as raw material is a product designed by reducing and roasting ore and coal at high temperature into strontium sulfide, and carbonating it after water immersion and filtration, among which reduction roasting is the key. Due to the use of reverberatory furnace roasting equipment, manual turning of materials, poor equipment, backward technology, low pro...
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IPC IPC(8): C22B1/10
Inventor 兰计香金保升仲兆平肖睿黄亚继
Owner 南京东大能源环保科技有限公司