在热轧板带材生产期间,板带的表面将产生一层氧化铁皮,通常用盐酸来清洗热轧板带。出于生态和经济需要,企业要对酸洗液进行再处理,经过处理后的盐酸再用于酸洗过程。 酸洗过程亦产生富含氧化铁的沉渣。这些沉渣可用于水泥或玻璃制造。但是更有价值的使用是用于制造磁铁。为此,传统上通常采用造球和环形炉加热至1200℃进行烧结。 During hot strip production, a strip of scale is produced on the surface of the strip and the hot strip is usually washed with hydrochloric acid. For ecological and economic needs, enterprises should reprocess the pickling liquid, and the treated hydrochloric acid is reused in the pickling process. Pickling also produces iron oxide-rich sediment. These sediments can be used in cement or glass manufacturing. But the more valuable use is for making magnets. For this reason, traditionally, pelletizing and toroidal furnaces have been used to heat to 1200 ° C for sintering.