摘要
摘 要
电气石是一种独特的自发电极性矿物,是研究晶体电性的代表性矿物,也
是电性利用最普遍、在当今的社会各个领域应用最广泛的矿物之一。由于其自
然电极的存在,电气石被广泛的应用于环境保护、生活生产等许多领域,如环
境治理、生态领域、生活日用品、涂料工业、电磁屏蔽等。
本文就电气石的粒度对白度和负离子的影响进行了研磨实验。得出随着粒
度的减小,白度增加,但负离子的释放数目随之减小。
通过对改性之后的粉体的白度和负离子释放率的研究得出最佳的包覆工
艺条件为:原料的粒度根据实际的需要进行选择,包覆量最佳为在电气石粉体
和二氧化钛质量比 1:1 时,反应温度越高越好,最好接近水的沸点,中和的最
佳终点 pH 值为 6,中和速度为 26.5ml/min,电气石粉体浓度为 9%。最佳的煅
烧工艺条件为:煅烧时间为 0.5 小时。煅烧的温度则是根据不同实际的需要对
二氧化钛的晶型的要求而定,在 500℃以下为锐钛型二氧化钛,在 500℃~800
℃之间为锐钛型和金红石型共存,超过 850℃时就全部转化为金红石型二氧化
钛。
该研究的创新点是:首次采用沉淀反应方法在电气石粉体表面包覆 TiO2,
不仅提高了电气石粉体的白度,而且增加了电气石粉体的负离子释放率,改性
之后的电气石粉体白度从原来的 15.9%提高到 60%以上,负离子也由 600 个/cm3
左右提高到 3000 个/cm3以上,从而为拓展电气石的用途打下了良好的基础。这
样电气石粉体就可以运用于白色涂料颜料和纺织等工业领域,具有广阔的市场
前景,能够产生较高的实际应用价值和经济价值。论文得出的最佳制备工艺条
件为该项目的中试放大奠定了基础。
Tourmaline is a kind of mineral which has the spontaneous electrode quality ; as
the representative mineral, which can help us study crystal electricity. and it is also
one of the minerals which are utilized most generally in many fields now. Because
of the exist of spontaneous electrode, Tourmalines are applied in many fields ,such
as in the protection of environment, ecological field, commodity, the industry of
dope, electromagnetism shielding and so on.
The experiment of grinding has been carried out in order to study the affection of
the size of tourmaline powder on the white degree and negative ion.The results
shows that as the size of tourmaline powder minishs, the white degree increases and
the number of negative ion released reduce at the same time .
After the primal powder being modified, we made a research on its the white
degree and the release ratio of negative ion, we got the best condition for coating
technics as follows:choosing the granularity of material by the demand of facts; the
best amount coated presents when the proportionment of the quality of tourmaline
power and ceria power is 1:1; the higher is the temperature, the better is the result ,
pH=6 is best for neutralization, the neutralization velocity is 26.5ml/min,the
consistence of the tourmalin powder is 9%。 The best condition for calcining as
follows : the time is half an hour at 500 centigrade, the calcine temperature is
depended on the demands of it`s use in fact ,we got anatase when the temperature is
below 500 centigrade, when the temperature is between 500 centigrade and 800
centigrade, both anatase and rutitle exist, and we got rutitle when the temperature
is above 850 centigrade.
The innovation of this research is that we first use the method of deposition in
covering tourmalin by TiO2. It improves the white degree of tourmalin, from 15.9 %
to 60%, and the release ratio of negative ion from 600 unit/cm3 to 3000 unit/cm3above.
These are important to expend the use of tourmalin. This kind tourmalin powder has a
broad foreground in application. It can be used in producing white paint and white
coating field, and also in the spinning field. It will create great valueapplications and
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ABSTRACT
economy. This paper gives the elements to the expending of the best condition for
producing.
引文
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