High-ash fine coal slime separation equipment and method

A high-ash fine coal slime separation equipment, comprising a feeding system, a mineralization system, a separation system and a pulsating water flow control system which are connected sequentially through pipelines, wherein

• the feeding system comprises a stirring barrel with a stirring motor on top, wherein materials at a discharging port at the bottom of the stirring barrel are pressurized by a pump to be fed into the mineralization system;
• the mineralization system comprises a bubble generator, a mineralization chamber and a turbulent-flow dissipation pipe, wherein an inlet of the bubble generator is connected to an outlet pipeline of the pump, and an outlet of the bubble generator is connected to a feeding port below the mineralization chamber;
• the separation system comprises a damping pulsating water flow type flotation column and an air compressor, wherein the damping pulsating water flow type flotation column is of a columnar structure, an air inlet connected to an outlet of the air compressor is formed at a bottom of the damping pulsating water flow type flotation column, and a clean coal overflow tank is arranged at the top of the damping pulsating water flow type flotation column;
• the pulsating water flow control system comprises a water tank, a variable-frequency pump, a PID control cabinet and a pressure gauge, wherein a water outlet of the water tank is connected to an inlet of the variable-frequency pump, an outlet of the variable-frequency pump is connected to the separation system through one of the pipelines, the pressure gauge is arranged on the one of the pipelines between the variable-frequency pump and the separation system, and the PID control cabinet is in circuit connection to the variable-frequency pump and controls work of the variable-frequency pump;
• wherein the damping pulsating water flow type flotation column is of a column-structure and is internally divided into a clean coal concentration region, an active pulse flow region, a damping pulsation region, an air flotation scavenging region and an inflation chamber;
• wherein the clean coal concentration region is the clean coal overflow tank arranged at a top end of the columnar structure, the active pulse flow region comprises an annular pulsating water flow pipe surrounding the damping pulsating water flow type flotation column, the annular pulsating water flow pipe is provided with a plurality of jet orifices to enable clean water to uniformly wash a foam layer in the separation process so as to effectively reduce mechanical covering phenomenon and reduce an ash content of clean coal, a flotation column feeding port is formed in a connecting portion of the damping pulsation region and the air flotation scavenging region, the damping pulsation region is provided with a plurality of damping blocks on an inner side wall of the damping pulsating water flow type flotation column, the damping blocks are of triangular structures and are uniformly arranged at a periphery of the damping pulsation region in a shell of the damping pulsating water flow type flotation column, an upper part of the air flotation scavenging region is provided with a flotation assisted baffle inclining downwards at a position of a surface opposite to the flotation column feeding port, the flotation assisted baffle prevents ore pulp from entering the damping pulsating water flow type flotation column to directly collide with an opposite column wall so as to reduce a desorption probability of coarse particles and improve flotation stability, an lower part of the air flotation scavenging region is provided with a tail coal opening on a side wall, a bottom of the inflation chamber is connected to an inlet of the air compressor, and one or more layers of microporous ceramic plates are arranged between a top of the inflation chamber and the air flotation scavenging region.