论文部分内容阅读
叶蜡石是一种铝硅酸盐,分子式为Al_2O_3·4SiO_2·H_2O。其组成为Al_2O_328.3%,SiO_266.7%,H_2O5%。它主要发现在酸性火山岩中,特别是在流纹岩、英安岩和较少的安山岩中,作为长石的热液蚀变产物或交代蚀变产物产出。叶蜡石是一种相对短缺的矿物,工业性生产仅限于不足十二个国家。最大产区在东南亚,特别是日本。年平均产量达一百万吨,南朝鲜年接近五十万吨,泰国年产量是变化的,但在某些年份可达一万吨,印度近年内已将它的年生产能力增至三万吨,澳大利亚年产量已增加,1979年最高已超过1.9万吨。国外第二个最大的产区在美洲,美国年
Pyrophyllite is an aluminosilicate with the molecular formula of Al 2 O 3 .4SiO 2 .H 2 O. Its composition is Al_2O_328.3%, SiO_266.7%, H_2O5%. It is mainly found in acidic volcanic rocks, especially in rhyolite, dacite and less andesite, as hydrothermal alteration products of feldspar or alteration products of metamorphism. Pyrophyllite is a relative shortage of minerals, industrial production is limited to less than twelve countries. The largest producing area is in Southeast Asia, especially Japan. With an average annual output of 1 million tons and a rate of nearly 500,000 tons in southern China, annual output in Thailand is changing but up to 10,000 tons in some years. In recent years, India has increased its annual production capacity to 30,000 Ton, Australia’s annual output has increased, the highest in 1979 has more than 19,000 tons. The second largest overseas production area in the Americas, the United States in years