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Abstract: This paper made deep studies on chlorite flotation using anionic/cationic collector, and the following effect factors such as pH,Ca2+,Na2S,NaF,Na2SiF6 and (NaPO3)6 are investigated. In the process of chlorite flotation using oleic acid as anionic collector, pH value increases. The concentration increase of Na2S and NaF can activate the chlorite flotation. However, Ca2+, Na2SiF6 and (NaPO3)6 can depress the chlorite flotation. In the process of chlorite flotation using lauryl amine as cationic collector, the maximum recovery of chlorite flotation happened in neutral pH condition, and the concentration increase of Ca2+ can activate the chlorite flotation; however, NaF and Na2SiF6 can depress the chlorite flotation. [Copyright &y& Elsevier]

Abstract: High-efficiency separation of hard-to-float high-ash fine coals has been a research hotspot in some countries, especially in China. Separation of hard-to-float high-ash fine coals by froth flotation, although considered to be the most effective, remains some challenges to be overcome. In this paper, the mineralogical/petrologic, physical and chemical characteristics of the of a hard-to-float high-ash fine coal collected in Kailuan mining area were studied. The floatability and liberation characteristics of this coal sample and potential separation processes were investigated experimentally. According to the coal characteristics, four separation processes were put forward and evaluated. Experimental results indicated that classified floatation couldn’t effectively improve the fine coal quality, while the processes of fine grinding-recleaning to roughing cleaning coal and selective agglomeration-floatation were suitable for the Kailuan coal. Compared with the original coal flotation process, the processes of fine grinding-recleaning to roughing cleaning coal increased the cumulative yield from 50.87% up to 55.53% while reduced the product ash content from 11.76% down to 10.74%. In the processes of selective agglomeration-floatation, the lowest ash of clean coal is 10.69%, with 58.72% yield, 7.85% higher in yield and 1.07% lower in ash content. The ash contents of the products from the two processes are lower than 11%, which meets the clean coal requirement. [Copyright &y& Elsevier]

Abstract: An experimental research on magnetic concentrate of a hematite using the anionic reverse flotation technology in the flotation column was conducted. Through systematic studies in the lab, the optimal technological and operational conditions had been obtained as follows: the circulation pressure of 0.055 MPa, the feeding quantity of 160 g/min, the collector dosage of 800 g/t and the starch dosage of 900 g/t. The results show that the iron concentrate with grade of 67.37% can be achieved according to the flow sheet of one roughing and one scavenging under the optimal conditions, and also reflects the advantages of excellent selectivity and high recovery. The application of cyclonic static micro-bubble flotation column in hematite reverse flotation provides a new approach for hematite reverse flotation in China. [Copyright &y& Elsevier]

Abstract: The special requirements for frother were raised because of the higher height, thickness foam layer and highly turbulent middling circulation circumstance of cyclonic-static microbubble flotation column (FCSMC). The characteristics of 730 series frother were studied for selecting suitable frother for copper sulfide ore separation by FCSMC. And copper sulfide ore flotation experiments were tested by laboratory FCSMC. The results indicate that the foaming ability of 730C is well which can form much more gasliquid interfaces at the same reagent dosages, 730E is the most stable frother. And frother 730C has satisfactory effect by laboratory FCSMC to separate copper sulfide ore, and the suitable gas hold-up is in the range of 22%-24%. [Copyright &y& Elsevier]