In the process of production and processing of limestone, it mainly uses the following equipment:milling machine (Raymond mill or high pressure grinding), jaw crusher, hammer crusher, impact crusher, sand making machine.
Coal (from the Old English term col, which has meant "mineral of fossilized carbon" since the 13th century) is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.
Coal is the largest source of energy for the generation of electricity worldwide, as well as one of the largest worldwide anthropogenic sources of carbon dioxide releases. In 1999 world gross carbon dioxide emissions from coal usage were 8,666 million tonnes of carbon dioxide.
Coal is extracted from the ground by coal mining, either underground by shaft mining, or at ground level by open pit mining extraction. Since 1983 the world top coal producer has been China,[5] in 2011 China produced 3,520 millions of tonnes of coal – 49.5% of 7,695 millions tonnes world coal production. In 2011 other large producers were United States (993 millions tonnes), India(589), European Union (576) and Australia (416).[5] In 2010 largest exporters were Australia with 328 million tonnes (27.1% of world coal export) and Indonesia with 316 millions tonnes (26.1%),[6] while largest importers were Japan with 207 million tonnes (17.5% of world coal import), China with 195 million tonnes (16.6%) and South Korea with 126 million tonnes (10.7%).
Coal gangue is the solid waste emission during coal mining and coal washing process, which is a dark grey rock that contains lower carbon content and harder than coal in the coal forming process.
Comprehensive recovery and utilization of coal gangue will be an effective way to mitigate the shortage of resources. With the development of science and technology, coal gangue recycling products will be a breakthrough and innovation, and create new value for the maximum utilization of fly ash.
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