643results about How to "The process is simple and reliable" patented technology

The invention relates to a process and a system for sorting coal by discharging coal gangue through a dry method, which are suitable for sorting the coal for quality improvement in water shortage places. The coal sorting process comprises a particle size classification step and a plus sieve raw coal sorting step. In the process, a particle size range which is suitable for markets is obtained by particle size classification, the obtained raw coal is sorted by a sensor, and coal briquettes with more impurities are blown into an impurity chamber through high-speed compressed air, so that the sorting accuracy and efficiency are improved. The coal sorting system comprises a dry screening machine, a plus sieve raw coal conveying chute, a sensor system, a control system, a spray nozzle and a flow split chamber, wherein the tail end of the dry screening machine is connected with the feeding end of the plus sieve raw coal conveying chute; the sensor system and the discharging end of the plus sieve raw coal conveying chute are arranged corresponding to each other; the flow split chamber is arranged below the plus sieve raw coal conveying chute; and the spray nozzle controlled by the controlsystem is arranged between the discharging end of the plus sieve raw coal conveying chute and the flow split chamber. The system has a compact structure and a small floor area.