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山东耐火材料厂所用的硬质粘土性脆,极易风化。因此在采装和贮运过程中,产生大量20毫米以下的粉矿,约占采矿总量的30%左右。这种粉矿用竖窑无法煅烧,虽然在制矿时用了一部分,但仍有20%左右未利用,致使矿石利用率和实际劳动生产率低,而且将影响矿山的开采年限。为了彻底扭转“二低”“一短”的落后局面,我厂职工立下愚公志,决心搬掉这座“粉矿山”,变废弃矿石为有用资源。为此,在1963～1964年期间,曾用试验型重油和煤粉回转窑进行了粉矿的
Shandong refractory materials used hard clay brittle, easily weathered. Therefore, during the process of loading, storage and transportation, a large amount of fines ore below 20 mm are generated, accounting for about 30% of the total amount of mining. This kind of powder shaft kiln can not be calcined. Although a part of it is used for ore production, about 20% is still unutilized, resulting in low ore utilization rate and actual labor productivity, and will affect the mining life of the mine. In order to completely reverse the backwardness of “two lows” and “one shortness,” our factory workers set a foolish objection to resolving this “powder mine” and turning waste ores into useful resources. To this end, from 1963 to 1964, the pilot heavy oil and pulverized coal rotary kiln was used for the flotation