一种混和型铝土矿生产氧化铝的方法

Method of producing aluminium oxide from mixed type bauxite

Abstract

一种混和型铝土矿生产氧化铝的方法,涉及一种采用用三水铝石—一水软铝石(或一水硬铝石)混合型铝土矿生产氧化铝的工艺方法。其特征在于溶出过程是采用石灰为溶出添加剂,将混合型铝土矿浆在低温下溶出后,溶出后矿浆分离出液相;再将分离的滤饼再次配矿后,在高温下溶出;再将低温溶出分离出的液相与高温溶出料浆混合经赤泥的沉降分离、叶滤,得到精制的铝酸钠溶液,经进行分解、洗涤、焙烧,生产出成品氧化铝。本发明的方法,用于高温溶出的一水软铝石型(或一水硬铝石)矿浆的体积降低30~35%,这会使单位产能的溶出系统的能耗也随之降低25%~30%。将会极大地降低氧化铝生产中溶出系统的单位产量的能耗,有很高的工业应用价值。
This invention discloses a preparation method that mixture bauxite prepares aluminum oxide. It relates to a technology of using gibbsite-nanocomposite (or diaspore) mixture bauxite to prepare aluminum oxide. Its characteristic is: utilize calcarea as dissolution additive in dissolution process, leach mixture bauxite liquid at low temperature, separate liquid phase from bauxite liquid; blend rock the separated filter cake, leach at high temperature; mix liquid phase leached by low temperature and material starch leached by high temperature, settlement separate by red-mud, filter, get depurated sodium aluminate solution, decompose, wash, calcinate, and produce finished product aluminum oxide. This invention can be used for high temperature dissolved gibbsite-nanocomposite (or diaspore) mine starch, of which volume can be decreased 0-35%. It can decrease energy expenditure of unit energy producing dissolving system 25%-30%. It can enormously decrease energy expenditure of unit energy producing. It has high industry application value.

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Cited By (5)

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    CN-102826577-ADecember 19, 2012长沙瑞德新材料科技发展有限公司, 北京鑫恒铝业有限公司Two-stage digestion process of boehmite-gibbsite hybrid bauxite
    CN-103332804-AOctober 02, 2013云南文山铝业有限公司Solid-liquid separation method for tailing pulp
    CN-103663520-AMarch 26, 2014贵州平坝宏大铝化工有限公司一种黑灰铝土矿拜耳法氧化铝生产方法
    CN-103663520-BJune 22, 2016贵州派腾科技服务有限公司一种黑灰铝土矿拜耳法氧化铝生产方法
    CN-105399120-AMarch 16, 2016中国铝业股份有限公司一水硬铝石溶出过程添加石灰的方法