石 灰石是钢铁生产中不可缺少的原料之一。为了保证钢铁质量 ,对原料必须精心筛选 ,宝钢对石灰石的筛选更是严格要求 ,由于筛选粒度在4mm以下 ,而且石灰石比较粘。宝钢位于长江口气候潮湿 ,在多雨季节用金属编织网筛选时堵孔现象特别严重。为此 ,宝钢从德国进口了一套橡胶筛网 Limestone is one of the indispensable raw materials in steel production. In order to ensure the quality of steel, raw materials must be carefully selected, Baosteel limestone screening is more stringent requirements, due to the screening of particle size below 4mm, and limestone relatively sticky. Baosteel is located in the humid climate of the mouth of the Yangtze River, in the rainy season with metal braid screening sieve blocking phenomenon is particularly serious. To this end, Baosteel imported a rubber screen from Germany