A kind of sintering method of alumina clinker
A technology of alumina and clinker, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problem of ineffective denitrification of sintering flue gas, and achieve the effect of reducing the content of nitrogen oxides
Active Publication Date: 2022-08-05
中铝山东新材料有限公司
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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 make those skilled in the technical field of the present application understand the present application more clearly, the technical solutions of the present application will be described in detail below with reference to the accompanying drawings and through specific embodiments.
[0030] As mentioned above, due to the inherent characteristics of alumina clinker sintering flue gas: the flue gas temperature is low, which cannot meet the temperature requirements for effective exhaust gas denitrification, and the high concentration of alkali metal ions in alumina clinker sintering flue gas will lead to The poisoning of the denitration catalyst makes it impossible to remove nitrogen oxides, so the sintering flue gas of the existing 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 the technical characteristics of alumina clinker sintering,...
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The invention discloses a method for sintering alumina clinker, which specifically includes: using bauxite to prepare raw slurry, controlling the fixed carbon content of the raw slurry to 6.0wt.%-7.0wt.%; according to a preset process , sintering the raw slurry in a clinker sintering rotary kiln to obtain clinker; the preset process includes reducing the oxygen content in the sintering rotary kiln during the sintering process. Through the above solution, an effective reburning zone is formed in the area from the kiln tail lifting plate to the decomposition zone in the sintering rotary kiln, so that the nitrogen oxides formed in the kiln head sintering zone are reduced in the reburning zone, thereby Significantly reduces the content of nitrogen oxides in the sintering flue gas discharged from the kiln tail, making the sintering kiln flue gas NO x The content meets the requirements of the third peak section of environmental protection, and the denitration efficiency can reach more than 50%, ensuring that the production process will not be shut down due to environmental protection.
Description
technical field [0001] The present application relates to the technical field of alumina clinker sintering, and in particular, to an in-furnace denitration method for alkali-lime sintered alumina clinker. Background technique [0002] To reduce NO X Enterprises usually need to denitrify the sintering flue gas. Tail gas denitrification, also known as flue gas purification technology, is to re-purify the exhaust gas that has been discharged to remove NO X reduction or adsorption oxidation. The most traditional and widely used SCR denitration technology in the world is tail gas denitration. Under the action of the catalyst, the flue gas is converted to NH 3 As a reducing agent, NO x revert to N 2 , the denitration efficiency is high, can reach 70% to 95%, but the investment is large, the operating cost is high, and the flue gas temperature after passing through the electrostatic precipitator should be above 200 ℃ to obtain effective denitration efficiency. At present, fl...
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IPC IPC(8): C01F7/441
CPCC01F7/441
Inventor 李小坚赵善雷田兴凯阎坤王世勇温波周佳
Owner 中铝山东新材料有限公司