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为发挥规模经济优势，从70年代起，发达国家选煤厂厂型已明显趋向大型化，在选煤装备方面提出了大型单机组合的观点，并掀起选煤设备大型化浪潮，先后制造出一批大型分选、筛分、脱水、过滤设备。为适应大型选煤厂建设需要，促进我国选煤技术和装备水平的提高，我们先后有计划
In order to give play to the advantages of economies of scale, from the 1970s onwards, plant types of coal preparation plants in developed countries have become more and more large-scale. A large stand-alone combination of coal preparation equipment has been put forward and a large-scale wave of coal preparation equipment has been launched. Large batch sorting, screening, dehydration, filtration equipment. In order to meet the needs of the construction of large-scale coal preparation plant to promote China’s coal preparation technology and equipment to improve the level, we have plans