Structural transformation of lattice ball mill

(1) The reconstruction of spare parts procurement system will not affect the construction. The dismantling and replacement of the 5# ball mill will begin in the near future, with a construction period of two and a half months. Except for the 238/lO00 rolling bearing and the 23-tooth shaft gear, all the spare parts needed for reconstruction will be used in the later stage of construction. Among them, the 23-tooth shaft gear makes the rotating speed from 18r/min ~ j [1] to 18× (23 ÷ 20) 20.7r/min, and 1 piece is available in the company's spare parts warehouse; Before the demolition and transformation of the 4# ball mill, two sets of rolling main bearings were already in the spare parts warehouse of mineral processing. The inner container at the discharge end can't be used for the time being, and the original small bucket is still replaced by a large discharge bucket and an iron plate to make a collision bag with a height of about 80ram. The feeder and discharger use iron plates as patented parts to ensure the supply within one month; Switch to l30ram steel ball, notify the steel ball manufacturer and ensure the supply within half a month. So it will not affect the construction period.

(2) Use the feeder and the discharger and replace them with new overflow ball mills.

Based on the assembly dimensions of the inlet and the feed end cover of the existing ball mill, in order to ensure that the filling rate of the cylinder is above 60% and the steel ball ore (slurry) does not flow back, a full-push feeder (about 1.2 t) is designed to replace the inlet and the combined (drum-shaped) feeder, * * * is reduced by 8 t, and steel balls, ore and water slide in from the discharge funnel (pipe). The cylinder is fully enclosed, and the feed end does not spit ore or leak material when starting and stopping.

Spiral overflow grading dischargers (about 1.3t) and 16 quick discharge end liners (each with a thickness of 70ram, a convex bag of about 80 μm and a width of about 80mm) are designed according to the assembly dimensions of the existing ball mill discharge port and discharge end cover, and the dynamic filling rate of pulp is 45% (the dynamic mixing filling rate in the cylinder is about 47%) to replace the discharge end. 6.ST is reduced (the original discharge cylinder screen is reduced by 8t).

(3) An efficient spiral classifier is added to the new overflow ball mill. At present, the 3.2×3. 1m lattice ball mill is equipped with a 2.4m double spiral classifier. When the cylinder rotates, the steel balls, ores and pulp in the cylinder move close to the discharge grid plate and are vertically separated; Among them, the ore particles smaller than the mesh of the grid plate (20mm wide) flow into the lifting bucket under the action of height difference and precipitate with the pulp, and the pulp in the bucket rotates and lifts with the cylinder. Under the action of height difference, ore particles with smaller particle size preferentially flow back into the drum with the pulp, and some of them

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