Clean production technique for preparation of aluminium oxide and white carbon black by using high-alumina coal ash
A high-alumina fly ash, alumina technology, applied in alumina/aluminum hydroxide, silica and other directions, can solve the problems of inability to meet large-scale industrial production, large output of by-product cement, large amount of limestone, etc. The effect of high value, low process energy consumption and low processing cost
Inactive Publication Date: 2007-09-26
CHINA UNIV OF GEOSCIENCES (BEIJING)
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The limestone consumption of this method is large, and sintering temperature is high, and energy consumption and cost are all very high; And CO 2 The amount of emissions is large, and the output of by-product cement is too large to meet the requirements of large-scale industrial production
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[0020] The clean production process for producing alumina and white carbon black by using high-aluminum fly ash mainly includes raw material pretreatment and sintering process, silicon-aluminum separation process, white carbon black production process and alumina production process. Among them, the alumina production process also includes processes such as water immersion and dissolution of aluminate solids, impurity removal of crude sodium aluminate solution, carbon decomposition of sodium aluminate solution, and aluminum hydroxide calcination. As shown in Figure 1.
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The invention discloses a clean producing craft of aluminum oxide and white carbon black comprehensively with high-alumina coal ash, which comprises the following steps: making sodium carbonate as raw material; disintegrating high-alumina coal ash under medium-temperature; generating acid dissoluble aluminosilicate materials; using dilute sulphuric acid to acid dip; separating aluminum oxide and silica in the high-alumina coal ash; further treating aluminous liquid part; generating hydrated alumina deposition; finishing gamma-alumina or alpha- alumina product through calcining; washing, purifying, drying; calcining the silica gel part; getting white carbon black, silica aerogel, ultra-fine silica, porous silica and so on inorganic silicide.
Description
technical field [0001] The invention relates to a new clean production process for preparing alumina and white carbon black by using high-alumina fly ash. Background technique [0002] In the past ten years, China's alumina industry has made great progress both in terms of output and production technology, but domestic alumina production has not been able to meet its consumption needs, and it still needs to rely on a large amount of imports to maintain domestic basic consumption. Currently, bauxite is the only mineral resource in alumina production in China. China's bauxite resources only account for 7.5% of the world's total, and most of them are diaspore-type ores with low aluminum-silicon ratio and poor dissolution performance. With the rapid development of China's primary aluminum industry, the demand for alumina continues to increase, resulting in a decrease in bauxite resources, which seriously hinders the sustainable development of China's aluminum industry. [0003...
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Login to View More IPC IPC(8): C01F7/02C01B33/113
Inventor 马鸿文杨静王英滨王蕾丁宏娅王芳高飞
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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