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Method for producing aluminum oxide by comprehensively treating bauxite through acid-base combination method
The invention provides a method for producing aluminum oxide by comprehensively treating bauxite through an acid-base combination method, which comprises the following steps: grinding bauxite and sodium nitrate crystals through a dry method, granulating, then roasting, and preparing dilute nitric acid from flue gas after roasting; performing wet grinding on the roasted clinker under an alkaline condition, blending ore pulp by using decomposition mother liquor, performing high-pressure dissolution, performing primary red mud separation and washing, then performing fine filtration on crude liquid, performing cooling seed precipitation, performing separation and washing on seed precipitation slurry, and roasting the obtained aluminum hydroxide to obtain aluminum oxide; the method comprises the following steps: carrying out primary red mud acid leaching with dilute nitric acid, carrying out secondary red mud separation and washing on obtained acid leaching ore pulp, carrying out acid leaching solution neutralization with decomposition mother liquor, carrying out neutralized hydrogen-aluminum separation and washing, carrying out evaporative crystallization on a sodium nitrate solution obtained by washing to obtain sodium nitrate crystals, and carrying out other nitrate recovery on sodium nitrate crystallization mother liquor. According to the method, middle-low-grade, high-sulfur and high-carbon bauxite aluminum oxide is efficiently utilized, the aluminum oxide yield is high, the consumption of acid, alkali and auxiliary raw materials is low, and the abandoned red mud does not contain alkali, so that all the red mud is comprehensively utilized conveniently.
本发明提供一种酸碱联合法综合处理铝土矿生产氧化铝的方法，将铝土矿与硝酸钠晶体干法粉磨、造粒，然后焙烧，焙烧后烟气制稀硝酸；将焙烧后熟料在碱性条件下湿法粉磨，用分解母液调配矿浆后高压溶出，进行一次赤泥分离洗涤，然后粗液精滤、降温种分，将种分浆料分离洗涤，所得氢氧化铝进行焙烧得到氧化铝；用稀硝酸进行一次赤泥酸浸，所得酸浸矿浆进行二次赤泥分离洗涤，用分解母液进行酸浸液中和，中和氢铝分离洗涤，洗涤所得硝酸钠溶液进行蒸发结晶，得到硝酸钠晶体，对硝酸钠结晶母液进行其他硝酸盐回收。本发明对中低品位、高硫高碳铝土矿氧化铝高效利用，氧化铝收率高，酸碱及辅助原材料消耗低，弃赤泥不含碱便于赤泥全部综合利用。
Method for producing aluminum oxide by comprehensively treating bauxite through acid-base combination method
The invention provides a method for producing aluminum oxide by comprehensively treating bauxite through an acid-base combination method, which comprises the following steps: grinding bauxite and sodium nitrate crystals through a dry method, granulating, then roasting, and preparing dilute nitric acid from flue gas after roasting; performing wet grinding on the roasted clinker under an alkaline condition, blending ore pulp by using decomposition mother liquor, performing high-pressure dissolution, performing primary red mud separation and washing, then performing fine filtration on crude liquid, performing cooling seed precipitation, performing separation and washing on seed precipitation slurry, and roasting the obtained aluminum hydroxide to obtain aluminum oxide; the method comprises the following steps: carrying out primary red mud acid leaching with dilute nitric acid, carrying out secondary red mud separation and washing on obtained acid leaching ore pulp, carrying out acid leaching solution neutralization with decomposition mother liquor, carrying out neutralized hydrogen-aluminum separation and washing, carrying out evaporative crystallization on a sodium nitrate solution obtained by washing to obtain sodium nitrate crystals, and carrying out other nitrate recovery on sodium nitrate crystallization mother liquor. According to the method, middle-low-grade, high-sulfur and high-carbon bauxite aluminum oxide is efficiently utilized, the aluminum oxide yield is high, the consumption of acid, alkali and auxiliary raw materials is low, and the abandoned red mud does not contain alkali, so that all the red mud is comprehensively utilized conveniently.
本发明提供一种酸碱联合法综合处理铝土矿生产氧化铝的方法，将铝土矿与硝酸钠晶体干法粉磨、造粒，然后焙烧，焙烧后烟气制稀硝酸；将焙烧后熟料在碱性条件下湿法粉磨，用分解母液调配矿浆后高压溶出，进行一次赤泥分离洗涤，然后粗液精滤、降温种分，将种分浆料分离洗涤，所得氢氧化铝进行焙烧得到氧化铝；用稀硝酸进行一次赤泥酸浸，所得酸浸矿浆进行二次赤泥分离洗涤，用分解母液进行酸浸液中和，中和氢铝分离洗涤，洗涤所得硝酸钠溶液进行蒸发结晶，得到硝酸钠晶体，对硝酸钠结晶母液进行其他硝酸盐回收。本发明对中低品位、高硫高碳铝土矿氧化铝高效利用，氧化铝收率高，酸碱及辅助原材料消耗低，弃赤泥不含碱便于赤泥全部综合利用。
Method for producing aluminum oxide by comprehensively treating bauxite through acid-base combination method
一种酸碱联合法综合处理铝土矿生产氧化铝的方法
MA HAIJUN (author) / PANG KAIFENG (author) / WANG YUANTAO (author) / LI HUILING (author)
2024-10-22
Patent
Electronic Resource
Chinese
IPC:
C01F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
,
Verbindungen der Metalle Beryllium, Magnesium, Aluminium, Calcium, Strontium, Barium, Radium, Thorium oder der Seltenen Erden
/
C04B
Kalk
,
LIME
/
C05C
NITROGENOUS FERTILISERS
,
Stickstoffhaltige Düngemittel
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