Selective flocculation is a new method to solve the problem of China's bauxite de-silication besides flotation and reverse flotation. The method of selective flocculation of bauxite using hydrolyzed polyacrylamide...Selective flocculation is a new method to solve the problem of China's bauxite de-silication besides flotation and reverse flotation. The method of selective flocculation of bauxite using hydrolyzed polyacrylamide as flocculant was experimented and evaluated. The results of diaspore and kaolinite single mineral settling tests show that the difference between settlement yield of kaolinite(settling 15 min) and diaspore(settling 3 min) increases from 16% to 60% by adding flocculant at pH=7. Results of selective flocculation experiment of bauxite show that the higher concentrate grade(65.75) and Al-Si ratio(7.34) could be obtained with sodium carbonate as dispersant compared with sodium hexametaphosphate; under the action of flocculating agent, the concentrate grade and Al-Si ratio increase to 67.99 and 9.01. These results could meet the requirements of Bayer production, and the simpler process was expected to cost far less than traditional flotation method and a promising de-silication method of bauxite.展开更多
Conjunction occupies an important part in discourse analysis, especially in the connecting analysis. The application of conjunction can achieve cohesion. However, according to the definition of register and genre, it ...Conjunction occupies an important part in discourse analysis, especially in the connecting analysis. The application of conjunction can achieve cohesion. However, according to the definition of register and genre, it is hard to find the total or completed function of these conjunctions in press release. The reason why this kind of phenomenon comes cross should be discussed in this paper. For doing this research, the researcher chooses one discourse which was found at www. globaleducationfirst.com as the material and select the conjunction out to prove the function of connection in application. As a kind of research, the aim or target is more important because as all paper goes, the purpose should be concentrated on. Why a style like news broadcasting or press release has so little conjunction functions as, for example, addition, means and, or contradictive but, however, and yet, or condition/f and so on. Some of them functions as internal, but others external. Whether it is the deliberate consideration or free formation by the editor is finally should be discussed, and from this point of view, conjunction＇ s function in press release reaches the target of cohesion展开更多
基金Project(2005CB623701)supported by the National Key Basic Research Program(973)of China
文摘Selective flocculation is a new method to solve the problem of China's bauxite de-silication besides flotation and reverse flotation. The method of selective flocculation of bauxite using hydrolyzed polyacrylamide as flocculant was experimented and evaluated. The results of diaspore and kaolinite single mineral settling tests show that the difference between settlement yield of kaolinite(settling 15 min) and diaspore(settling 3 min) increases from 16% to 60% by adding flocculant at pH=7. Results of selective flocculation experiment of bauxite show that the higher concentrate grade(65.75) and Al-Si ratio(7.34) could be obtained with sodium carbonate as dispersant compared with sodium hexametaphosphate; under the action of flocculating agent, the concentrate grade and Al-Si ratio increase to 67.99 and 9.01. These results could meet the requirements of Bayer production, and the simpler process was expected to cost far less than traditional flotation method and a promising de-silication method of bauxite.
文摘Conjunction occupies an important part in discourse analysis, especially in the connecting analysis. The application of conjunction can achieve cohesion. However, according to the definition of register and genre, it is hard to find the total or completed function of these conjunctions in press release. The reason why this kind of phenomenon comes cross should be discussed in this paper. For doing this research, the researcher chooses one discourse which was found at www. globaleducationfirst.com as the material and select the conjunction out to prove the function of connection in application. As a kind of research, the aim or target is more important because as all paper goes, the purpose should be concentrated on. Why a style like news broadcasting or press release has so little conjunction functions as, for example, addition, means and, or contradictive but, however, and yet, or condition/f and so on. Some of them functions as internal, but others external. Whether it is the deliberate consideration or free formation by the editor is finally should be discussed, and from this point of view, conjunction＇ s function in press release reaches the target of cohesion
