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Calcination and flash drying cyclic energy saving technology for intermediate wet carbonate from soft magnetic manganese zinc iron composite material prepared through precipitation method

A technology of flash drying and flash dryer, which is applied in the field of preparation of magnetic material raw materials, which can solve the problems of difficult temperature balance control, uneven material moisture, and non-environmental protection, so as to achieve stable burning loss and overcome uneven heating.

Active Publication Date: 2011-11-23
CHONGQING SHANGJIA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the production process, it was found that the rotary kiln was used for drying and calcination: the temperature is difficult to control evenly (the moisture content of the material is not uniform), and the calcined products are very easy to agglomerate, but agglomeration is the Achilles heel of magnetic material raw materials
At the same time, during the drying and calcination process using the rotary kiln, a large amount of waste heat is taken away, and the utilization rate of heat is very low, which is neither energy-saving nor environmentally friendly.

Method used

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  • Calcination and flash drying cyclic energy saving technology for intermediate wet carbonate from soft magnetic manganese zinc iron composite material prepared through precipitation method
  • Calcination and flash drying cyclic energy saving technology for intermediate wet carbonate from soft magnetic manganese zinc iron composite material prepared through precipitation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Produce 10.5 tons of co-sedimented powder (carbonate) in the tenth tank, with a water content of 35%.

[0016] A. Set up a calcination and flash drying cycle energy-saving system. The dynamic calciner 1 and the flash dryer 2 are connected through the first cyclone dust collector 5, and the flash dryer 2 is connected through the second cyclone dust collector 6. Bag vacuum cleaner 4; the bottom of the dynamic calciner 1 is connected to the hot blast stove 3, the top of the dynamic calciner 1 is connected to the tangential inlet of the first cyclone dust collector 5, and the top outlet of the first cyclone dust collector 5 is connected to the flash drying The bottom inlet of the flash dryer 2 is connected, the top of the flash dryer 2 is connected to the tangential inlet of the second cyclone dust collector 6, and the top outlet of the second cyclone dust collector 6 is connected to the bag vacuum cleaner 4; the second cyclone dust collector 6. The outlet at the lower end ...

Embodiment 2

[0019] Produce 8.3 tons of co-sedimented powder (carbonate) in the tenth tank, with a water content of 40%.

[0020] The process is the same as that in Implementation 1, except that the temperature of the waste heat airflow input into the flash dryer 2 after the dynamic calciner 1 is calcined is 220°C; the heat provided by the hot blast stove 3 is 820°C, and the sieve on the 160-mesh sieve is 0.6%<1%, dark brown powder is obtained.

Embodiment 3

[0022] Produce 13.3 tons of co-sedimented powder (carbonate) in the tenth tank, with a water content of 40%.

[0023] The process is the same as that in Implementation 1, except that the temperature of the waste heat airflow input into the flash dryer 2 after the dynamic calciner 1 is calcined is 220°C; the heat provided by the hot blast stove 3 is 820°C, and the sieve on the 160-mesh sieve is 0.6%<1%, dark brown powder is obtained.

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Abstract

The invention discloses a calcination and flash drying cyclic energy saving technology for an intermediate wet carbonate from a soft magnetic manganese zinc iron composite material prepared through a precipitation method. First, a calcining and expansion drying cyclic energy saving system is set up. Wet carbonate is added into a flash dryer, dried rapidly by waste heat in the dryer, and then sent to a secondary cyclone by system negative pressure, and enters to a calciner bottom from the cyclone bottom through a spiral. Depending on heat provided by an air heater and system negative pressure, the material fully contacts with heat and is treated with ebullience calcination in the calciner. After calcination, calcined material, together with superfluous heat, is introduced into a primary cyclone by the system negative pressure, treated with cyclone separation and falls into a hopper collector; and residual heat is introduced into a flash drying furnace bottom. According to the invention, an integral utilization of waste heat after calcination drying is realized; and the calcined material has stable physical ignition lost and is sieved by a 160 mesh screen, leaving riddling no more than 1%, to obtain black brown powder.

Description

[0001] technical field [0002] The technology of the present invention belongs to the preparation of magnetic material raw materials, specifically, it belongs to the cycle energy-saving process of calcining and flash drying the intermediate product wet carbonate of soft magnetic manganese-zinc-iron composite material produced by precipitation method. Background technique [0003] The patent "a method for preparing soft magnetic manganese zinc iron mixture" (patent number: ZL 2009 1 0103167.X) is applied in actual large-scale production (15,000 tons / a), and the equipment used in the decomposition and calcination process is Ordinary rotary kiln. During the production process, it was found that the rotary kiln is used for drying and calcination: the temperature is difficult to control evenly (the moisture content of the material is not uniform), and the calcined products are very easy to agglomerate, but agglomeration is the Achilles heel of magnetic material raw materials. A...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/64H01F1/34
Inventor 董新桥马俊才廖新仁
Owner CHONGQING SHANGJIA ELECTRONICS
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