A Research On The Process OF Coal Electrochemical Flotation And Its Mechanism

China is a country with the largest coal output and consumption; it is also of the country that has high sulfur coal reserve. The sulfur in coal not only results in serious pollution, but also affects the quality and output of coke, synthetic gas and steel. So desulfurization of coal is very important to our society. A new coal desulfurization method witch combines electrochemistry with coal flotation is put forward to solve the problem. The method which makes up for the low percentage of desulfurization with physical methods and overcomes the shortcoming of changing coal character with chemical methods, which lays the foundation for coal desulfurization industrialization. This paper mainly concentrates on the study of coal desulfurization results with conventional flotation methods, and depressant flotation methods. The research is mainly focused on the influence of electrochemistry treatment on the results of flotation desulfurization under different conditions and the change of pyretic sulfur before and after treatment and studies the change of the surface structure the flotation desulfurization coal by means of determining contact and FTIR analysis. At the same time we studied the mechanism this method to provide industrialization with the evidence.The main results and conclusion are as follows:1. Coal desulfurization result of flotation is better than depressant flotation.But flotation concentration recovery and perfect index flotation are lower.So coal sesulfurization of depressant flotation is not economical.2. The flotation experimental in the different condition indicates that coal electrochemical flotation is better than flotation and depressant flotation. The reason is that depressant flotation not only depresses pyretic but also depresses coal, while coal electrochemical flotation enhances the selection of flotation.3. Though making investigation into electrochemical desulfurization. We find that: desulfurization results in alkaline medium are better in acidity and neutral medium.4. The more collecting agent, the higher flotation concentration recovery of coal electrochemical flotation, the lower percentage of desulfurization. This result shows coal desulfurization effect is obvious by reducing the amount of collecting agent.5. By making use of determining contact angle and FTIR analysis we conclude that surface structure of coal undergone electrochemical treatment has changed compared with the original state before the treatment. The change in the coal may be caused by the decrease of coal surface -OH and charge in coal floatability may be the cause of deoxygenate reaction.