At present, most of the mining methods of Chinese wollastonite mines are open-pit mining. The scale of mining is tentatively determined according to the “Specifications for Geological Exploration of Wollastonite Geology (Trial)†of the National Mineral Reserves Committee: the annual output of wollastonite hand-selected concentrate is larger than 50,000 tons, and the medium-sized 50,000-10,000 tons is medium-sized, less than 10,000 tons is small.
Due to the small scale of mining of wollastonite ore and the low production of ore, it is the road development that uses more open-pit mining. The iron-mercury mountain wollastonite mine in Lishu County, Jilin Province, produced limestone ore at the same time as the wollastonite ore, with a total scale of 320,000 t/a, most of which is limestone ore. The car uses a 10t self-unloading heavy-duty truck. Other small mines can be used with 5t self-unloading heavy vehicles. The Lijiaxiang wollastonite mine in Changxing County, Zhejiang Province is underground mining and is developed by inclined wells.
The open-pit mining process of wollastonite is generally similar to that of limestone mines, and medium-sized mines are more formal. Taking the iron-mercury mountain wollastonite ore in Lishu County, Jilin Province as an example, the ore and surrounding rock are dense and hard, and the stability is good. The ore body is layered, and the working surface is arranged along the strike. The height of the step is 10m. Due to the small scale of mining and the small equipment specifications, SQ100J type down-the-hole drilling rig for perforation blasting, hole diameter φ100mm, loading 966E loader, YT-26 rock drill for secondary crushing and shallow hole drilling, working surface transportation Use a 10t self-unloading heavy-duty truck. The specifications for the use of auxiliary equipment are also small, and the bulldozer uses the D6H type. Other small ore mining is often irregular and resources are wasted.
Underground mining technology, Lijiaxiang wollastonite mine in Changxing County, Zhejiang Province is a metamorphic mineralization between granite and vermiculite strip limestone. The ore body has a gentle dip angle of only 5°-15°, the average thickness is 2.5m, and the surrounding rock roof is stable and stable. The inner roadway is mostly unsupported, and the exposed area of ​​the goaf can reach 100-200m. 2 The comprehensive mining method of the open field method is adopted. Working face mining process: using a hand-held rock drill to drill, the hole depth is 1.2m, shallow hole blasting, mining, manual loading, transport 0.6t mine car. It is transported out through transport lanes, Shimen, etc.
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