Analyses that Malan coal preparation plant had been appeared slimes and stary ion circuit accumulation,lead to recovery reduced to 25%.

• 马兰矿选煤厂自 1 998年 8月入洗 0 2 %23 煤以来 ,洗水开始出现微细泥及有害离子循环积聚 ,导致其回收率仅达 2 5%25 ,易洗 8%23 、2 %23 煤回收率也降到投产以来最低点。