Expenses for repairing and maintenance were reduced after the low frequency sound wave deashing device was used.
经采用低频声波清灰装置，减少了检修和维护的费用。
For effective desulfurization and deashing of high-sulfur coal with its use of usual magnetic separation device, a surface magnetism enhancement of coal-derived minerals is a new key technology.
煤系矿物的表面磁性强化是利用通常磁选设备实现高硫煤脱硫脱灰的新型关键技术。
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