CAJ | 학술논문

主要从固相法和液相法两个方面介绍铬盐生产工艺中铝杂质的脱除方法，固相法重点介绍无钙焙烧法，无钙焙烧熟料中含铝固相产物有铁镁矿(Mg(Fe,Al)2O4)、铝硅酸钠(NaAlSiO4)和铝硅酸镁钠(Na4MgAl2Si3O12)。同时，根据铬矿成分的不同，添加含硅或含铝原料，控制SiO2和Al2O3摩尔比，使铬铁矿中的铝和硅在无钙焙烧过程中转化成为铝硅酸钠和铝硅酸镁钠。铬酸盐熟料浸出过程中，液相中铝化合物主要是铝酸盐。液相法脱除铝杂质与体系的碱浓度密切相关。低碱浓度时，碳分法有利于得到铬酸盐夹带少、易过滤的氢氧化铝；高碱浓度时，首先进行萃取脱碱，降低溶液中碱/铝比例，然后采用种分法得到氢氧化铝沉淀。综述了各种除铝方法的特点，并探讨了除铝方法的发展方向。
주요종고상법화액상법량개방면개소락염생산공예중려잡질적탈제방법，고상법중점개소무개배소법，무개배소숙료중함려고상산물유철미광(Mg(Fe,Al)2O4)、려규산납(NaAlSiO4)화려규산미납(Na4MgAl2Si3O12)。동시，근거락광성분적불동，첨가함규혹함려원료，공제SiO2화Al2O3마이비，사락철광중적려화규재무개배소과정중전화성위려규산납화려규산미납。락산염숙료침출과정중，액상중려화합물주요시려산염。액상법탈제려잡질여체계적감농도밀절상관。저감농도시，탄분법유리우득도락산염협대소、역과려적경양화려；고감농도시，수선진행췌취탈감，강저용액중감/려비례，연후채용충분법득도경양화려침정。종술료각충제려방법적특점，병탐토료제려방법적발전방향。
The solid phase method and liquid phase method for aluminum removal in the chromium compound production were reviewed. The special emphasis was placed on lime free roasting process. Magnesioferrite (Mg(Fe,Al)2O4), sodium aluminosilicate (NaAlSiO4), silicic acid, aluminum magnesium sodium salt(Na4MgAl2Si3O12) are the major phases of aluminum containing compound. Certain amounts of silica dioxide or aluminum oxide and such additives, depending on the chromium containing material, are added to control the molar ratio of SiO2 and Al2O3 in order to form aluminum containing compound. The liquid phase methods is relative to the alkali concentration. For decomposition of aluminates in low alkali solution, carbonate process benefit for the production of easy filterable aluminum hydroxide with little content of chromate. For decomposition of aluminates in high alkali solution, aluminum hydroxide is obtained by seed composition following by extraction of great amount of alkali metal hydroxide and decrease of alkali/aluminum ratio. Finally, the problems and development of aluminum removal process were pointed out and analyzed.