WC-10Co cemented carbides with finer WC and narrower grain size distributions are produced by using(Cr,V)_(2)(C,N)as grain growth inhibitors.As a result,with the increase of(Cr_(0.9),V_(0.1))_(2)(C,N)and(V_(0.9),Cr_(0...WC-10Co cemented carbides with finer WC and narrower grain size distributions are produced by using(Cr,V)_(2)(C,N)as grain growth inhibitors.As a result,with the increase of(Cr_(0.9),V_(0.1))_(2)(C,N)and(V_(0.9),Cr_(0.1))_(2)(C,N),the grains size of WC and mean free path of Co phase decrease,and adjacency of WC increases.Refinement and homogenization of grains enhance the transverse rupture strength(TRS)and the hardness.Meanwhile,the deflection and bridging of cracks keep the fracture toughness at a respectable level.The WC-10Co-0.6(Cr_(0.9),V_(0.1))_(2)(C,N)-0.025(V_(0.9),Cr_(0.1))_(2)(C,N)cemented carbides exhibit excellent comprehensive mechanical properties with the TRS of 4602.6 MPa,hardness of 1835 kg/mm^(2),and fracture toughness of 10.39 MPa·m^(1/2),respectively.However,the large pores are caused by excess N larger than 0.03 wt%and deteriorates the mechanical properties.We provide a new approach to WC-Co cemented carbides preparation with a narrow grain size distribution by adding novel grain growth inhibitors.展开更多
燃煤电厂含煤废水悬浮物含量高、浊度高、水质水量情况变化较大,不宜与其他废水混合处理。文章根据含煤废水水质特点,对化学混凝、电絮凝、磁混凝工艺进行研究,分析了各工艺的发展应用状况与其优势、不足,提出燃煤电厂含煤废水处理工艺...燃煤电厂含煤废水悬浮物含量高、浊度高、水质水量情况变化较大,不宜与其他废水混合处理。文章根据含煤废水水质特点,对化学混凝、电絮凝、磁混凝工艺进行研究,分析了各工艺的发展应用状况与其优势、不足,提出燃煤电厂含煤废水处理工艺须根据废水水质水量情况与发电厂环境、经济等情况,选择最适用的方法和装置进行高效处理与循环利用。 The coal-bearing wastewater of coal-fired power plants is not suitable for mixed treatment with other wastewater because of its high content of suspended matter, high turbidity and great variation of water quality and quantity. According to the water quality characteristics of coal-bearing wastewater, this paper studies the chemical coagulation, electric flocculation and magnetic coagulation processes, analyzes the development and application status of each process and its advantages and disadvantages, and proposes that the coal-bearing wastewater treatment process of coal-fired power plants should be based on the quality and quantity of wastewater and the environment and economy of the power plant, and select the most suitable methods and devices for efficient treatment and recycling.展开更多
基金Funded by the 2021 Strategic Cooperation Project between Sichuan University and The People's Government of Zigong(No.2021CDZG-1)Major Science and Technology Research Projects of Panxi,Sichuan Province(No.2022PXZB-04)。
文摘WC-10Co cemented carbides with finer WC and narrower grain size distributions are produced by using(Cr,V)_(2)(C,N)as grain growth inhibitors.As a result,with the increase of(Cr_(0.9),V_(0.1))_(2)(C,N)and(V_(0.9),Cr_(0.1))_(2)(C,N),the grains size of WC and mean free path of Co phase decrease,and adjacency of WC increases.Refinement and homogenization of grains enhance the transverse rupture strength(TRS)and the hardness.Meanwhile,the deflection and bridging of cracks keep the fracture toughness at a respectable level.The WC-10Co-0.6(Cr_(0.9),V_(0.1))_(2)(C,N)-0.025(V_(0.9),Cr_(0.1))_(2)(C,N)cemented carbides exhibit excellent comprehensive mechanical properties with the TRS of 4602.6 MPa,hardness of 1835 kg/mm^(2),and fracture toughness of 10.39 MPa·m^(1/2),respectively.However,the large pores are caused by excess N larger than 0.03 wt%and deteriorates the mechanical properties.We provide a new approach to WC-Co cemented carbides preparation with a narrow grain size distribution by adding novel grain growth inhibitors.
文摘燃煤电厂含煤废水悬浮物含量高、浊度高、水质水量情况变化较大,不宜与其他废水混合处理。文章根据含煤废水水质特点,对化学混凝、电絮凝、磁混凝工艺进行研究,分析了各工艺的发展应用状况与其优势、不足,提出燃煤电厂含煤废水处理工艺须根据废水水质水量情况与发电厂环境、经济等情况,选择最适用的方法和装置进行高效处理与循环利用。 The coal-bearing wastewater of coal-fired power plants is not suitable for mixed treatment with other wastewater because of its high content of suspended matter, high turbidity and great variation of water quality and quantity. According to the water quality characteristics of coal-bearing wastewater, this paper studies the chemical coagulation, electric flocculation and magnetic coagulation processes, analyzes the development and application status of each process and its advantages and disadvantages, and proposes that the coal-bearing wastewater treatment process of coal-fired power plants should be based on the quality and quantity of wastewater and the environment and economy of the power plant, and select the most suitable methods and devices for efficient treatment and recycling.
