Interfacial interaction of bio-leaching of pyrite mineral

Electrokinetic and contact angle measurements were used to discuss the interfacial interaction on bio-leaching of pyrite mineral. Surface energy parameters of pyrite mineral and thiobacillus ferrooxidans were obtained by calculating according to formula of Young's equation and contact angle measurements. The results show that surface energy of thiobacillus ferrooxidans is much higher than that of pyrite mineral, and the reaction of pyrite mineral with thiobacillus ferrooxidans causes the reduction of the pyrite surface energy. The interfacial interaction energies between pyrite mineral and thiobacillus ferrooxidans were also obtained based on polar interfacial interaction theory and electrokinetic and contact angle measurements. The thermodynamics approach only considering Lifshitz-van der Waals and Lewis acid-base interaction fails to explain the adhesion behavior of the bacteria, but the extended Derjaguin-Landan-Verwey-Overbeek theory concerning Lifshitz-van der Waals and Lewis acid-base and the electrostatic can exactly predict interfacial interaction.     

计量技术机构考核与档案管理

档案管理是计量技术机构管理的组成部分 ,也是计量技术机构考核的重要内容之一 ,ＪＪＦ１０６９ -２０００《法定计量检定机构考核规范》(以下简称《考核规范》）对检定机构的档案管理提出了新的要求 ,档案工作如何适应《考核规范》的要求是我们面临的一个新的课题。一、以技术机构考核为契机提高档案管理的有效性《考核规范》要求计量技术机构必须建立完善的质量体系 ,根据要求结合本机构的实际情况制定管理职责、体系文件、质量手册、程序文件和建立质量管理体系所需文件及控制程序 ,并做到有效执行 ,使机构的全部检定 ,校准、检测活动都…