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对取自巴西北部里奥卡皮姆(RioCapim)地区的高岭土矿样,在CETEM/CN-Pq做了一系列实验室小型试验。整批矿样先进行了均匀化处理,然后按颗粒粒度分级,在脱色处理之前将+44μm粒级去除。这一系列试验的主要目的是为了研究变量的相互作用对最终产品亮度的影响。这些变量在脱色作业中起重要作用。试验按传统的四因素二水平析因试验方法设计。所选因素为pH值,连二亚硫酸钠添加量,硫酸铝添加量和脱色时间。研究表明除脱色时间外,其余3个因素对作业的影响都较显著,而它们之间的交互作用没有一项具有显著性。产品的白度值达到了近88,高于里奥卡皮姆高岭土—44μm矿样脱色前的白度值83。
A series of laboratory mini-tests were conducted at CETEM / CN-Pq for kaolin samples taken from the Rio Capim area in northern Brazil. The entire batch of ore samples was homogenized and then classified by particle size to remove +44 μm particles prior to decolorization. The main purpose of this series of experiments is to study the effects of variable interactions on the brightness of the final product. These variables play an important role in bleaching operations. Test according to the traditional four factors and two horizontal factorial test method design. The factors selected are pH, sodium dithionite addition, aluminum sulphate addition and decolorization time. The results showed that except for the decolorization time, the other three factors had more significant impact on homework, but none of them was significant. The whiteness value of the product reached nearly 88, which is higher than the whiteness value of the pre-decolorization of the loam-Kapok kaolin -44μm ore sample 83.