摘要
目前尚没有国家标准来统一和规范触变性的测试方法,而轻工标准QB/T 1545-1992仍是应用于非金属矿物触变性测试的较为适用的方法之一,但该规范中的方法介绍较为简单,对触变性测试的影响因素(如电解质的添加)未有详细叙述和研究,实际指导性不强。本文依据QB/T 1545-1992,以膨润土和皂石为矿物样品,研究触变性测试方法及其影响因素,重点对电解质最佳用量和陈化时间进行条件试验。结果表明:添加电解质对触变性影响很大,不同矿种及同种矿物的样品在触变性试验中所需的电解质最佳添加量是不同的,测试具体矿物的触变性时,需先对电解质最佳添加量进行条件试验。样品悬浮物的陈化时间对其触变性的测试结果有很大影响。在测试触变性的过程中,应严格按照轻工标准QB/T 1545-1992规定的陈化时间10-12 h,以保证方法精密度要求;若陈化时间过长,其触变性明显增大,触变性已无法计算。本文通过对触变性测试方法中电解质用量和陈化时间两个重要影响因素的研究,可为现有触变性测试方法的改进提供一定的依据。
At present,there is no national standard method to regulate the test method of thixotropy. The light industry standard of QB/T 1545-1992 is still available to test the thixotropy of nonmetallic mineral materials. The test method of thixotropy introduced in QB/T 1545-1992 is simple and has no detailed description and research on effect factors,such as the added amount of electrolyte and it is not precise enough to test thixotropy. In this research,the method of thixotropy and its affecting factors,especially the best added amount of electrolyte and the assembly time were studied by testing the thixotropy of three kinds of bentonite samples and one kind of saponite according to the standard of QB/T 1545-1992 . It was found that there was a great impact of added electrolyte on the thixotropy. Different kinds of minerals,even different samples of the same kind of mineral have different optical amounts of electrolyte added into the mineral dispersions. Hereby,the optical amount of electrolyte should be tested for each sample. It was also found that the assembly time of the mineral dispersion has a great effect on thixotropy. The assembly time of 10 to 12 hours should be strictly adhered to,followed by the standard method of QB/T 1545-1992 to obtain good precision. The longer assembly time will increase thixotropy significantly,which cannot be calculated. The method of testing thixotropy and its affecting factors, in order to provide the basis for improvement for existing thixotropy test method are the main focus of this work.
出处
《岩矿测试》
CAS
CSCD
北大核心
2014年第3期359-362,共4页
Rock and Mineral Analysis
基金
国土资源公益性行业科研专项经费项目(201111028)
关键词
膨润土
皂石
触变性
电解质用量
陈化时间
bentonite
saponite
thixotropy
electrolyte dosage
aging time