前言目前,四川省所需的硫铁矿及其精矿和耐火粘土大部分需从外省调入。据不完全统计,每年从外省调进的硫精矿和耐火粘土均在十万吨以上,这不仅加重了交通部门的负担,增加了运输费用,而且远不能满足本省的需求。例如,由于缺乏足够的硫酸,磷肥工业的潜力无法发挥出来,只好生产不受农民欢迎的生矿粉或半钙磷肥。造成这一不 Preface At present, most of the pyrites and concentrates and refractory clays required in Sichuan Province need to be transferred from other provinces. According to incomplete statistics, sulfur concentrates and refractory clays transferred from other provinces are above 100,000 tons each year, which not only aggravates the burden on the transport sector but also increases transportation costs and can not meet the needs of the province. For example, the potential of the phosphate fertilizer industry can not be exploited due to the lack of sufficient sulfuric acid, so it has had to produce raw meal or hemi-calcium phosphate that is not welcomed by farmers. Cause this no