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从不同的矿物原料 (如石英砂、高岭土、粘土等 )中 ,用化学生物联合方法除掉含铁氧化矿物的技术得到了发展。在此方法中 ,矿物原料在由细菌产生的草酸和盐酸的浸出液中进行浸出 ,浸出温度为 90℃±。浸出是在带有机械搅拌的耐酸反应器中进行。随被浸出的矿物原料的铁含量和铁的存在形式不同 ,浸出时间为 1 -6h不等。经过此方法处理后 ,一些石英砂的Fe2 O3含量从 0 0 3 5-0 0 88%降至 0 0 1 2 %以下 ,使得它们适合制作优质的玻璃。不同种类高岭土的Fe2 O3含量可从 0 65-1 4 9%降为 0 4 4-0 75% ,从而使它们的白度从 55-87%增至 86-92 %。粘土中的Fe2 O3含量从 6 2 5%降至 1 85% ,使粘土的耐火性从 1 670℃增至 1 750℃。同样的方法也被用来从主要为粘土和高岭土的铝硅酸盐中浸出铝。但是在这种情况下 ,含有柠檬酸的微生物发酵液体是通过硫酸或盐酸 ,或不同无机酸的混合物来进行酸化的。为了提高铝的溶解度 ,铝硅酸盐浸出前在 60 0℃ -650℃的温度下加热 1 -2h。不同种类的粘土和高岭土中的90 %以上的铝在 3 -6h内将被浸出来。“硅酸盐”细菌与环状芽胞杆菌类有关 ,已用来从含有杂质铝硅酸盐的低品位的铝土矿中浸出硅。细菌的作用与矿物结构的裂解 (通过细菌代谢物 ,如有机酸和多糖 )有关 ,同时与
Techniques have been developed to remove iron-containing oxide minerals by chemical and biological methods from different mineral materials (such as quartz sand, kaolin, clay, etc.). In this method, the mineral raw material is leached in the leachate of oxalic acid and hydrochloric acid produced by the bacteria at a leaching temperature of 90 ° C ±. Leaching is carried out in a mechanically stirred acid-resistant reactor. With the leaching of mineral raw materials, iron content and the existence of different forms, leaching time ranging from 1 -6h. After this method, some quartz sand Fe2O3 content from 0 0 3 5-0 0 88% down to 0 0 1 2% or less, making them suitable for making high quality glass. The different types of kaolin Fe2 O3 content can be reduced from 0 65-1 4 9% to 0 4 4-0 75%, so that their whiteness increased from 55-87% to 86-92%. The Fe 2 O 3 content in clay decreased from 62.5% to 18.5%, increasing the fire resistance of clay from 1670 ℃ to 1750 ℃. The same method is also used to leach aluminum from aluminosilicates, which are mainly clay and kaolin. However, in this case, the citric acid-containing microbial fermentation liquid is acidified by sulfuric acid or hydrochloric acid, or a mixture of different mineral acids. In order to increase the solubility of aluminum, the aluminosilicate is heated at a temperature of 60 0-650 ° C. for 1-2 h before leaching. More than 90% of the different types of clays and kaolins will be leached in 3 to 6 hours. “Silicate” bacteria are associated with the genus Bacillus circulans that have been used to leach silicon from low grade bauxite containing the impurity aluminosilicate. The role of bacteria is related to the lysis of mineral structures (through bacterial metabolites such as organic acids and polysaccharides)