Synthesis And Performance Study Of Alkyl Polyglycosides-flotation Foaming Agent

In recent years coal preparation industry has been made a big advance with the development of clean coal technology., It lead to making its main product-fine coal increase that the capacity of washery was expanded rapidly. Then it caused a threat on the closed circuit that coal slime significantly increased in slurry preparation plant. traditional flotation agent has difficult fine flotation, mostly poor flotation effect is bad. Considering the pollution and shortage of the oil, bio-based foaming agent is at a premium. nations of the world were researching the flotation medicament synthesized with natural raw material to replac the petrochemical. Alkyl polyglycoside can reduce drug consumption, improve the yield and quality of clean coal, non-toxic harmless and easy to operate. at the same time Alkyl polyglycoside is keeping with the current development of the flotation reagent.In this thesis alkyl polyglucosides are prepared by the renewable resource glucose and the natural fatty alcohol with the indirect method. The optimized synthesis craft: the catalyst mixed with p-toluenesulfonic acid and sulfuric acid, the quality ratio of catalyst to glucose is 0.015:1, alcohol to glucose is (5～6):1, at 118℃and pH=3-6, the reaction time is 3.5h,during the reaction starch glucose addition in batchs.The structure of APGs is analyzed by means of infrared absorption spectroscopy, recording the characteristic absorption skeleton vibration peaks C-O-C (1500cm-1-1650cm-1), and the stretching vibration peaks C-O and C-O-C (1100cm-1-1000cm-1).The spectrum proves the structure of APGs. It is also analysised by GC-MS that the alkyl polyglycosides is composed with dodecyl-a-D-glucopyranoside and glucopyranoside.At the time, the surface tension, CMC, emulsion properties, foaming and stability properties, cloud point and stability in hard water are determined. It is conformed that APGs have excellent surface active.The compare test of foaming agent was taken with miscellaneous alcohol, synthetic and commodity APG to the coal sample got from the coal mine Wugou Huaibei, Haizi, Baishan,Liuer and Renlou, the result indicates that the selectivity of alkyl polyglycosides class synthetic foaming agents is better than others.In Order to improve the flotation technology of Baishan coal preparation plant. The orthogonal design is used to get the optimized floatation compositions for the slurry with APG as foaming agentand diesel as collector. Depend on the recovery of the burnable matter, the best combination ofthe optimized floatation compositions is Al* B3* C2:pulp density 80g/L, foaming agent 100g/t, collector agent 1200g/t.Figure [10] table [36] reference [72]...