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本文主要介绍在重介选煤系统中γ射线测灰仪的使用条件；并通过试验数据和产品灰分记录曲线，证实了利用产品灰分信号修正重介密度自动控制系统中的给定密度，可以提高和稳定产品质量。该装置在开滦马家沟矿选煤厂投入正常运行以后，取得了明显的经济效益。
This article mainly introduces the conditions of using γ-ray gray measuring instrument in heavy medium coal preparation system. And through the test data and the product ash record curve, it is proved that using the product ash signal to correct the given density in the automatic control system of heavy medium density can improve And stable product quality. The device in the Kailuan Majiagou coal preparation plant put into normal operation, and achieved significant economic benefits.