The age of jinchuan body was estimated between 1300ma ~ 1500ma ; period of time . the age of jinchuan body was estimated between 1300ma - 1500ma ; disseminated ore is about ~ 1217ma ; sideronitic ore is about 960ma and massive ore is about 911 ma 其成岩年龄可能在13亿年到15亿年之间；浸染状贫矿石主要形成年龄约1217ma ；海绵陨铁矿石主要形成年龄约960ma ；而块状矿石形成年龄911ma左右。
2.
Heiyingshan iron ore mine is the high content iron ore base of jiuquan iron and steei co . ( jisco ) . we must be studied both the ore dressing technology of the lean ore and the high phosphor content ore and economic and technical analysis for building the ore dressing - works to make fully use of them 酒钢黑鹰山铁矿是酒泉钢铁(集团)公司的富矿基地，为充分利用矿石资源需对贫矿和高磷富矿进行选矿流程研究和选矿厂建设技术经济分析。
3.
According to determined ore dressing technology , we have studied the building of the dressing - works for technology and economy and conclude that if the iron ore dressing - works will be set up , which could produce 138 , 000 tons of iron ore fine at the cost of 204 . 92rmb yuan / mt ( without taxes ) for jisco . its raw material is the lean iron ore and high phosphor content iron ore in stock 根据确定的选矿流程进行了选矿厂方案的技术经济、建厂条件、公辅设施论证，得出：如果投资建厂，可利用黑鹰山堆存贫矿和高磷富矿，每年为酒钢供应成本为204 . 92元吨(不含税)的13 . 8万吨铁精粉，经济效益和社会效益较为显著，建议酒钢公司在资金容许的条件下可以投资黑鹰山选矿厂建设。
4.
The test results show that the whiteness of high - grade grammite powder can be increas4ed from 72 to 84 by using single high - intensity magnetic separation , and the one of low - grade grammite powder containing carbonaceous materials from 62 to about 81 by using the hims - airflow pulverising - flotation flowsheet 试验结果表明，采用单一强磁选方法可将硅灰石富矿粉的白度由72提高到84 ；采用强磁选-气流粉碎-浮选新工艺可将含碳质物的硅灰石贫矿粉的白度由62提高到81左右。
