Crystal form transformation energy-saving device, alumina roasting system and production method thereof
A technology of crystal transformation and energy-saving devices, which is applied in chemical instruments and methods, inorganic chemistry, chemical industry, etc., can solve the problems of rising exhaust gas discharge temperature, unfavorable roaster production capacity, and large gas consumption, so as to reduce fuel consumption. The effect of unit consumption, lower temperature and lower concentration
Pending Publication Date: 2018-11-02
HUNAN SIWEI ENERGY ENVIRONMENT ENG
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Problems solved by technology
When the roasting temperature is high, the gas consumption is large, and the caustic soda burning of alumina is low. At the same time, the exhaust gas discharge temperature rises, and the heat loss increases relatively. Increased sensible heat, which increases energy consumption and is not conducive to increasing the productivity of the roaster
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Embodiment 1
[0061] A kind of alumina roasting system, see figure 1, including crystal conversion energy-saving device 1, main roaster 2, cyclone separation device 3, Venturi dryer 4, first cyclone preheater 5, second cyclone preheater 6, auxiliary roaster 7, electric dust collector 8 , fluidized bed cooler 9, aluminum hydroxide storage bin 10, product bin 12 and chimney 13, specifically as follows:
[0062] The structure of the crystal form conversion energy-saving device 1 is detailed in figure 2 , including the main box 1.1, the discharge pipe 1.2, the pressure balance pipe 1.3, the return pipe 1.4, the air distribution mechanism 1.5 and the discharge pipe group 1.7, the details are as follows:
[0063] The inner cavity of the main box 1.1 is divided into a loose bed 1.11 and a conveying bed 1.12 arranged side by side by a partition 1.6, and the lower end of the partition 1.6 and the bottom of the inner cavity of the main box 1.1 form a channel 1.13 for materials to pass through , pr...
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Abstract
The invention provides a crystal form transformation energy-saving device, which comprises a main box body, a blanking pipe, a pressure equalizing pipe, a return pipe and a wind distribution mechanism. The crystal form transformation energy-saving device has the effects of simple structure and convenient making, is convenient to control an appropriate retention time of materials in the main box body, ensures the completion of material crystal form transformation, and enables the product to reach the quality requirements of high-quality metallurgical grade alumina. The invention also provides an alumina roasting system, which includes a main roasting furnace, a cyclone separation device and the crystal form transformation energy-saving device. Through combination of the crystal form transformation energy-saving device and an existing alumina roasting system, the alumina roasting system provided by the invention has the characteristics of lowering the temperature of the main roasting furnace, reducing the unit consumption of fuels or increasing the productivity of the roasting furnace, reducing the initial nitrogen oxide concentration of the roasting furnace and the like, and throughthe design of a secondary air supply apparatus, the initial nitrogen oxide emission of the roasting furnace is greatly reduced. The invention also discloses a production method of alumina, the methodhas the advantages of simplified technological process, high efficiency, energy saving and emission reduction, and is easy for industrial production.
Description
technical field [0001] The invention relates to the technical field of nonferrous metallurgy, in particular to a crystal transformation energy-saving device used in an alumina gaseous suspension roasting system, an alumina roasting system and a production method thereof. Background technique [0002] The calcination temperature of alumina is the main factor affecting the quality of alumina. The suspension roasting temperature is generally controlled at 1050°C-1150°C. During the roasting process, with the progress of dehydration and phase transformation, the physical and chemical properties of alumina and its shape, particle size and surface properties will change accordingly. Alumina calcined at -1000°C has a small angle of repose and good fluidity. At the same time, due to α-Al 2 o 3 Low content, large specific surface area, fast melting speed in cryolite melt during electrolysis, strong adsorption capacity for HF, when the calcination temperature reaches above 1200 ℃, th...
Claims
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IPC IPC(8): C01F7/44
CPCC01F7/441Y02P20/10
Inventor 蒋受宝沈育敏周国章
Owner HUNAN SIWEI ENERGY ENVIRONMENT ENG
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