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试验结果表明,回收尾矿中的硫,磷在工艺上是可行的。其后,又作了初步方案。现将1981年4月马鞍山钢铁设计研究院提出的《马鞍山发展磷肥生产初步方案简介》一文中,所列的选磷车间部分技术经验指标于表3。 由表3可知,选磷车间的银行投资贷款偿还期,从投产后计算为5.3年,投资收益率为15.7％,利润为491.80万元,每年可回收磷精矿约20万吨,硫精矿约9万吨。
The test results show that it is feasible to recover the sulfur and phosphorus from the tailings. Later, another preliminary plan was made. Now in April 1981, Maanshan Iron and Steel Design and Research Institute put forward the “Ma On Shan Development of a preliminary program of phosphate fertilizer production,” a paper listed in the selected phosphorus workshop part of the technical indicators in Table 3. As can be seen from Table 3, the loan repayment period of bank investment loans for the phosphorus workshop is calculated to be 5.3 years after putting into production. The investment return rate is 15.7% and the profit is 4.9180 million yuan. The annual recovery of phosphorus concentrate is about 200,000 tons and sulfur concentrate About 90,000 tons.