然后，加入含腐殖酸衍生物的分散剂，以产生煤水混合物。

Then, a dispersant, composed of humic acid derivative, is added to produce to coal water mixture.

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灾难发生的前几天，河南省一煤矿发生煤矿倒塌，很多工人被困。

The disaster comes days after another mine in Henan province experienced a rock burst, which trapped pit workers.

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煤气管网随着运行时间的增加，易发生煤气泄漏，引发各种事故。

Gas pipe network easily leaked as time passed and this would result in incidents.

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