The physical properties and hydration of a cementitious material, which prepared mainly from the vanadium slag and phosphate slag, were investigated. These slags were investigated can be reused as original resources t...The physical properties and hydration of a cementitious material, which prepared mainly from the vanadium slag and phosphate slag, were investigated. These slags were investigated can be reused as original resources to prepare cement clinker based on the fact that they mainly comprise silicon and calcium phases, respectively. In this research, a batch of cement having various grades was prepared by mixing the clinker with gypsum, tailings, and fly ash. X-ray diffraction(XRD), differential thermogravimetric(DTG) as well as scanning electron microscopy(SEM) were applied to test and analyze the physical properties and hydration of the prepared cement. Experimental results suggest that the performances of the cement meet the requirements of national standards in all aspects. Its hydration process is similar to that of common Portland cement, whose hydrates were mainly composed of C-S-H, ettringite and CH. Moreover, the addition of fine particles would accelerate cement hydration, as it provided additional surfaces to help the nucleating and growing of hydrates.展开更多
某硫化铜矿含铜0.65%、硫9.50%、Mg O 5.20%,属于高滑石硅酸镁夕卡岩型铜硫矿。由于矿石中黄铁矿和滑石含量较高,且滑石在磨矿过程中极易发生泥化,恶化浮选环境,造成现场铜浮选指标不理想。为了解决该铜矿中高滑石、高硫对铜浮选的影响...某硫化铜矿含铜0.65%、硫9.50%、Mg O 5.20%,属于高滑石硅酸镁夕卡岩型铜硫矿。由于矿石中黄铁矿和滑石含量较高,且滑石在磨矿过程中极易发生泥化,恶化浮选环境,造成现场铜浮选指标不理想。为了解决该铜矿中高滑石、高硫对铜浮选的影响,在工艺矿物学研究的基础之上,提出采用"SNA调整剂调浆-CMC抑制滑石-铜硫混合浮选-粗精矿脱药再磨-铜硫分离"工艺。闭路试验获得了铜品位25.71%、回收率82.13%的铜精矿,铜精矿含Mg O小于5%。工艺显著提高了铜回收率,并降低了铜精矿Mg O含量。展开更多
This article presented an experimental research on washability of microcrystal graphite using float-sink tests.Chemical and X-ray analyses showed that graphite,semi-graphite,meta-anthracite,and anthracite existed toge...This article presented an experimental research on washability of microcrystal graphite using float-sink tests.Chemical and X-ray analyses showed that graphite,semi-graphite,meta-anthracite,and anthracite existed together in this microcrystal graphite sample;and the intergrowth relationship between microcrystal graphite and gangues was very complicated based on optical mineralogy research.The results of float-sink tests revealed that:for the-25+0.5 mm size fraction,about 68%(by weight)of microcrystal graphite was obtained at the density of 2.0 g/cm^3.and the float product met the standard of commercial grade W65;for the-0.5 mm size fraction,58%(by weight)of microcrystal graphite was floated at the density of 2.0 g/cm^3,which met the standard of commercial grade W70.It can be concluded that microcrystal graphite may be upgraded by dense media separation(DMS)providing a float product using as the raw materials of casting or refractories.展开更多
基金Funded by the National Key Technology Research and Development Program of China(No.2012BAB07B02)the National Natural Science Foundation of China(No.51774330)+1 种基金the Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources(No.2018TP1002)the Teacher Research Foundation of Central South University(2015)
文摘The physical properties and hydration of a cementitious material, which prepared mainly from the vanadium slag and phosphate slag, were investigated. These slags were investigated can be reused as original resources to prepare cement clinker based on the fact that they mainly comprise silicon and calcium phases, respectively. In this research, a batch of cement having various grades was prepared by mixing the clinker with gypsum, tailings, and fly ash. X-ray diffraction(XRD), differential thermogravimetric(DTG) as well as scanning electron microscopy(SEM) were applied to test and analyze the physical properties and hydration of the prepared cement. Experimental results suggest that the performances of the cement meet the requirements of national standards in all aspects. Its hydration process is similar to that of common Portland cement, whose hydrates were mainly composed of C-S-H, ettringite and CH. Moreover, the addition of fine particles would accelerate cement hydration, as it provided additional surfaces to help the nucleating and growing of hydrates.
文摘某硫化铜矿含铜0.65%、硫9.50%、Mg O 5.20%,属于高滑石硅酸镁夕卡岩型铜硫矿。由于矿石中黄铁矿和滑石含量较高,且滑石在磨矿过程中极易发生泥化,恶化浮选环境,造成现场铜浮选指标不理想。为了解决该铜矿中高滑石、高硫对铜浮选的影响,在工艺矿物学研究的基础之上,提出采用"SNA调整剂调浆-CMC抑制滑石-铜硫混合浮选-粗精矿脱药再磨-铜硫分离"工艺。闭路试验获得了铜品位25.71%、回收率82.13%的铜精矿,铜精矿含Mg O小于5%。工艺显著提高了铜回收率,并降低了铜精矿Mg O含量。
基金financially supported by Jingfeng InternationalInvestment Co.,LtdAnhui University of Science & Technology for its support
文摘This article presented an experimental research on washability of microcrystal graphite using float-sink tests.Chemical and X-ray analyses showed that graphite,semi-graphite,meta-anthracite,and anthracite existed together in this microcrystal graphite sample;and the intergrowth relationship between microcrystal graphite and gangues was very complicated based on optical mineralogy research.The results of float-sink tests revealed that:for the-25+0.5 mm size fraction,about 68%(by weight)of microcrystal graphite was obtained at the density of 2.0 g/cm^3.and the float product met the standard of commercial grade W65;for the-0.5 mm size fraction,58%(by weight)of microcrystal graphite was floated at the density of 2.0 g/cm^3,which met the standard of commercial grade W70.It can be concluded that microcrystal graphite may be upgraded by dense media separation(DMS)providing a float product using as the raw materials of casting or refractories.
