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Circulating fluidized bed mineral reducing roasting device and reducing roasting method

A technology of circulating fluidized bed and roasting device, which is applied in the field of reduction roasting of inorganic minerals, can solve the problems of low product output and quality, large amount of fly ash, high energy consumption, etc., and achieves reliable operation of equipment and improved production. Indicators, the effect of improving the operating environment

Inactive Publication Date: 2005-04-13
南京东大能源环保科技有限公司
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AI Technical Summary

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

Method used

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  • Circulating fluidized bed mineral reducing roasting device and reducing roasting method
  • Circulating fluidized bed mineral reducing roasting device and reducing roasting method

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Embodiment Construction

[0026] The embodiments of the present invention will be described below with reference to the drawings.

[0027] The pretreatment ore control particle size is ≤2mm, raise it to hopper 1, and use the speed-adjusting screw 3, and send it to the fluidization section 5 of the roasting furnace. The raw coal particle size is sieved to ≤10mm, and it is raised to the coal scuttle 2 and sent in with the speed-adjusting screw 4 The fluidization section 5 of the roasting furnace has a coal weight ratio of 1.5 to 1.65. The combustion air is provided by the blower 17, and the heat is recovered by the gas-gas heat exchanger 16 and then sent from the air box 7 at the bottom of the roasting furnace, and enters the roasting through the air distribution plate 6. In the furnace fluidization section 5, the coal is incompletely burned in this area, the temperature in the bed is controlled to be 900-935°C, and the apparent reaction time is 1.3-1.5 hours. The fly ash carried in the exhaust gas of the ro...

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Abstract

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 circulating fluidized bed inorganic mineral reduction roasting device and a reduction roasting method, and belongs to the technical field of inorganic mineral reduction roasting. Background technique [0002] Generally, inorganic salt products (such as strontium carbonate and barium carbonate, etc.) are made from natural minerals through ore pretreatment, roasting, leaching and carbonization, among which roasting is the key to their production. For example, strontium carbonate produced by carbon reduction method using celestite as the raw material is a design product that ore and coal are reduced and roasted at high temperature to form strontium sulfide, and then carbonated after leaching and filtering. The key is reduction roasting. Due to the use of reverberatory furnace roasting equipment, manual turning of animal materials, simple equipment, backward technology, low product efficiency, high energy co...

Claims

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Application Information

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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
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