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全世界硅灰石的探明储量为1.6亿吨,1985年世界开采量达到25万吨。主要硅灰石生产国有美国、印度、芬兰和中国、我国又是硅灰石主要出口国,预计到2000年,我国硅灰石的年产量约15～20万吨,出口量达10万吨。硅灰石用于陶瓷、釉面砖、电焊条、油漆和橡胶工业,其中以在塑胶类物质中作填料及石棉代用品居多,目前国外正从事以硅灰石代替钛用于宇宙飞船保护壳和轴的研究。 一.国内外硅灰石选矿进展 铁和方解石是硅灰石中的有害组分,铁过高降低产品的白度,方解石过量引起坯体结构松驰。国外一般控制硅灰石中Fe_2O_3<
The proven reserves of wollastonite in the world are 160 million tons. In 1985, the world’s mining volume reached 250,000 tons. The main wollastonite producing countries are the United States, India, Finland and China. China is another major exporter of wollastonite. It is estimated that by the year 2000, the annual output of wollastonite in China will be about 150-200,000 tons and the export volume will reach 100,000 tons. Wollastonite is used in ceramics, glazed tiles, welding electrodes, paint and rubber industries, among which packing materials and asbestos substitutes are mostly used in plastic materials. At present, wollastonite is being replaced by wollastonite for the spacecraft protective shell and Axis research. First, the progress of wollastonite beneficiation at home and abroad Iron and calcite are harmful components in wollastonite, iron is too high to reduce the whiteness of the product, excessive calcite caused slab structure relaxation. Foreign general control of wollastonite Fe_2O_3 <