Solution chemical equilibria involving flotation agents(hereafter llotagents),minerals and solution play a crucial role in determining the behavior of complex flotation systems.Salt-type minerals such as calcite,apati...Solution chemical equilibria involving flotation agents(hereafter llotagents),minerals and solution play a crucial role in determining the behavior of complex flotation systems.Salt-type minerals such as calcite,apatite etc are sparingly soluble in aqueous solution and form dissolved mineral species in bulk solution.It has been found that such dissolved species interact with the minerals,and often lead to surface conversion of the minerals.In addition,they can interact with various llotagents and lead to surface or bulk precipitation and loss of selectivity in the flotation.Relevant solution equilibria of these salt-type minerals and their interactions with conventional and structurally modified reagents are discussed.Better selectivity in their flotation can be achieved by controlling such interactions and manipulating the solution chemical equilibria.展开更多
Self-fluxing iron ore concentrates containing coal have good microwave Absorbability. With the voluminal heating property of microwave, the concentrates can be reduced uniformly and swiftly. The metallized semi-produc...Self-fluxing iron ore concentrates containing coal have good microwave Absorbability. With the voluminal heating property of microwave, the concentrates can be reduced uniformly and swiftly. The metallized semi-product can be directly charged into electric furnace for making clean steel. The total consumed energy of overall route is about 20 98 GJ.展开更多
XRD, TEM, SEM and EDS are employed to analyze smectites in the clay fraction of the surface sediments from the East Pacific. It is shown from the XRD results that the clay fraction consists of about 20% smectites.Thre...XRD, TEM, SEM and EDS are employed to analyze smectites in the clay fraction of the surface sediments from the East Pacific. It is shown from the XRD results that the clay fraction consists of about 20% smectites.Three types of smectites are identified, Fe-rich (Type Ⅰ), Fe,Mg-rich (Type Ⅱ) and Na,Ca smectite (Type Ⅲ), and most of them are not well-crystallized. Type Ⅰ is widely distributed in sediments, showing honeycomblike in the SEM, and aggregated or dispersive hairlike, or cloudy assemblage with a bit curl near its edge in the TEM. This type is considered to be typomorphic type of authigenic smectite in the East Pacific. Type Ⅱ is similar to Type Ⅰ in micromorphology in the TEM, showing a transition micronite, while Type Ⅲ is tabletlike in the TEM with an unclear edge. Type Ⅰ may be altered from voleanics and some of them even precipitated from the low subthermal water. Type Ⅱ could also be formed in the ocean floor, while Type Ⅲ comes from dry and distant continental area. This study suggests that the characteristic of chemical composition and morphology of smectite may give a clue to understand sediment source, origin of minerals and sedimentation in the deep sea.展开更多
基金supported by the Florida Institute of Phosphate Reseac。
文摘Solution chemical equilibria involving flotation agents(hereafter llotagents),minerals and solution play a crucial role in determining the behavior of complex flotation systems.Salt-type minerals such as calcite,apatite etc are sparingly soluble in aqueous solution and form dissolved mineral species in bulk solution.It has been found that such dissolved species interact with the minerals,and often lead to surface conversion of the minerals.In addition,they can interact with various llotagents and lead to surface or bulk precipitation and loss of selectivity in the flotation.Relevant solution equilibria of these salt-type minerals and their interactions with conventional and structurally modified reagents are discussed.Better selectivity in their flotation can be achieved by controlling such interactions and manipulating the solution chemical equilibria.
文摘Self-fluxing iron ore concentrates containing coal have good microwave Absorbability. With the voluminal heating property of microwave, the concentrates can be reduced uniformly and swiftly. The metallized semi-product can be directly charged into electric furnace for making clean steel. The total consumed energy of overall route is about 20 98 GJ.
文摘XRD, TEM, SEM and EDS are employed to analyze smectites in the clay fraction of the surface sediments from the East Pacific. It is shown from the XRD results that the clay fraction consists of about 20% smectites.Three types of smectites are identified, Fe-rich (Type Ⅰ), Fe,Mg-rich (Type Ⅱ) and Na,Ca smectite (Type Ⅲ), and most of them are not well-crystallized. Type Ⅰ is widely distributed in sediments, showing honeycomblike in the SEM, and aggregated or dispersive hairlike, or cloudy assemblage with a bit curl near its edge in the TEM. This type is considered to be typomorphic type of authigenic smectite in the East Pacific. Type Ⅱ is similar to Type Ⅰ in micromorphology in the TEM, showing a transition micronite, while Type Ⅲ is tabletlike in the TEM with an unclear edge. Type Ⅰ may be altered from voleanics and some of them even precipitated from the low subthermal water. Type Ⅱ could also be formed in the ocean floor, while Type Ⅲ comes from dry and distant continental area. This study suggests that the characteristic of chemical composition and morphology of smectite may give a clue to understand sediment source, origin of minerals and sedimentation in the deep sea.
