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煤矸石是山西最大量的工业废弃物。它不仅侵占土地，还污染环境，故必须进行土地复垦。煤矸石山的复垦种植历来需先盖土，随后才能种植。但山西的老矸石山大多无土可盖；或盖土投资过大，给复垦带来一定的困难。我们自１９８８～１９９０年进行了盖土、盖粉煤灰和不盖土的种草试验。结论是：煤矸石风化物上盖土和粉煤灰可改善植物的立地条件，但如加以适当的措施，覆盖和不覆盖的矸石风化物都可生长植物，但以覆为好。其中覆盖物以黄土优于粉煤灰。
Coal gangue is the largest amount of industrial waste in Shanxi. It not only encroaches on the land but also pollutes the environment, so it must carry out land reclamation. Reclamation of coal gangue hill has always had to cover the soil before it can be planted. However, most of the old gangue shanxi soilless cover; or overburden investment is too large, bring some difficulties to reclamation. From 1988 to 1990, we carried out the tests of covering soil, covering with fly ash and covering soil without covering. The conclusion is that coal gangue weathering material covering soil and fly ash can improve the plant site conditions, but if appropriate measures, covered and uncovered gangue weathering plants can grow plants, but the cover is better. Among them, loess is better than fly ash in covering.