The Experimental Research on Flotation Preparation of Jincheng Ultra-low Ash Cleaning Coal

摘要

It is important to clean the coal before using it in thermal power stations,steel plants,or cement industries etc.The increasing environmental pollution problems from the use of coal have led to the development of clean coal technologies.In fact,the clean use of coal requires the cleaning of coal to ultra low ash contents.The goal of this paper is to develop and test an innovative coal cleaning process to reduce the ash content of coal and produce ultra-clean coal.Coal samples prepared from concentrates of Jincheng coal preparation plants were found to have initial ash contents of 13.67％.Firstly,the coal samples were preprocessed by means of screening,and then these coals were demineralized with the flotation method.According the Orthogonal experiment,the optimum conditions in Coal flotation are as follows: collector is 0.2ml,frother is 0.05ml,pulp density is 60g/L,particle size is 0.125- 0.074mm,rotated speed is 2000 r/min,respectively.The experiment data indicate that the yield of ultra-clean coal is 23.64 wt％ and ash in coal is 3.93 wt％,repectively.