南京凤凰山铁矿主通风系统改造研究项目,1983年12月26日至28日经江苏省冶金工业厅组织鉴定通过。该项成果是马鞍山矿山研究院与南京凤凰山铁矿协作取得的。从1981年5月开始,他们针对矿山由露天开采转地下开采后原设计通风系统受到不同程度的破坏,使区段漏风率高达80.15％,有效风量率仅为19.85％,存在着危及矿山生产和安 Nanjing Fenghuangshan Iron Mine main ventilation system transformation project, December 26, 1983 to 28 by the Jiangsu Provincial Department of Metallurgical Industry Organization identified by. The result was obtained in collaboration with the Ma’anshan Mining Research Institute and the Fenghuangshan Iron Mine in Nanjing. From May 1981 onwards, the original design ventilation system was destroyed to varying degrees after the mine was converted from open pit mining to underground mining. As a result, the air leakage rate in the section reached as high as 80.15% and the effective air volume rate was only 19.85%. As a result, Ann