Sintering method of alumina clinker
A technology of alumina and clinker, which is applied in the fields of chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., and can solve problems such as ineffective denitrification of sintering flue gas
Active Publication Date: 2020-04-10
GUIZHOU BRANCH CHINA ALUMINUM IND
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[0003] The invention provides a sintering method of alumina clinker to solve or partially solve the technical problem that the existing alumina clinker sintering flue gas cannot be effectively denitrated
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[0029] In order to enable those skilled in the technical field to which the application belongs to understand the application more clearly, the technical solutions of the application will be described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0030] As mentioned above, due to the inherent characteristics of alumina clinker sintering flue gas: the flue gas temperature is low, the temperature requirement for effective tail gas denitrification cannot be met, and the high concentration of alkali metal ions in alumina clinker sintering flue gas will cause The poisoning of the denitrification catalyst makes it impossible to remove nitrogen oxides, so the existing sintering flue gas of alumina clinker can only be discharged directly, but this treatment method is unsustainable in today's high environmental protection requirements. Based on this background and according to the technical characteristics of alumina clinker sintering, the...
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The invention discloses a sintering method of alumina clinker, which specifically comprises the following steps of: preparing raw slurry from bauxite, and controlling the fixed carbon content of the raw slurry to 6.0-7.0 wt.%, sintering the raw slurry in a clinker sintering rotary kiln according to a preset process to obtain clinker. The preset process comprises the step of reducing the oxygen content in the sintering rotary kiln in the sintering process. Through the above scheme, an effective re-combustion area is formed in an area from a kiln tail raising plate in the sintering rotary kiln to a decomposition zone, the nitrogen oxides formed in the kiln head firing zone are reduced in the reburning zone, so that the content of the nitrogen oxides in the sintering flue gas exhausted from the kiln tail is remarkably reduced, the NOx content of the sintering kiln flue gas meets the requirement of the third peak section of environmental protection, the denitration efficiency can reach 50%or above, and the production process is ensured not to be shut down due to environmental protection.
Description
technical field [0001] The present application relates to the technical field of alumina clinker sintering, in particular to a method for denitration in a sintering furnace of soda-lime sintered alumina clinker. Background technique [0002] To reduce NO X emissions, companies usually need to denitrify the sintering flue gas. Exhaust gas denitrification, also known as flue gas purification technology, is to repurify the exhausted exhaust gas and reduce NO X reduction or adsorption oxidation. The more traditional and widely used SCR denitrification technology in the world is tail gas denitrification. Under the action of the catalyst, the flue gas is converted to NH 3 As a reducing agent, at a certain temperature, NO x Revert to N 2 , The denitrification efficiency is high, which can reach 70% to 95%, but the investment is large and the operating cost is high, and the flue gas temperature after passing through the electrostatic precipitator should be above 200°C to obtai...
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Login to View More IPC IPC(8): C01F7/44
CPCC01F7/441
Inventor 李小坚赵善雷田兴凯阎坤王世勇温波周佳
Owner GUIZHOU BRANCH CHINA ALUMINUM IND