SU865400A1 - Device for contacting flotation pulp with reagents - Google Patents

Description

(54) DEVICE FOR CONTACTING A FLOTATION PULP WITH REAGENTS

one

The invention relates to devices 1 for mixing flotation pulp. with photoreagents and can be used in the ore-dressing, chemical, and coal industries.

A device for contacting flotation pulp with reagents is known, comprising a tub of cylindrical shape with feed and discharge nozzles, a rotating shaft with an agitator, a circulation pipe mounted concentrically to the shaft, and a window that tapers towards the agitator 3.

The disadvantage 1 (4 of the known device is that the arrangement of the rotary impeller in the upper part of the circulation pipe does not provide the supply of the largest particles from the lower part of the tank and the mixing zone. This is because the speed of the upflow in the lower part of the tank is not high enough to allow large particles to move upwards. Finally, tapyraaac stagnates.

particles at the bottom of the tank, which reduces the efficiency of mixing.

The purpose of the invention is to intensify the press by mixing flotation pulp with reagents.

The goal is achieved by the fact that the windows of the circulation pipe are located above the impeller, while the total area of the windows is 2, 5, 3, 5 times the cross-sectional area of the circulation pipe & 1.

The drawing shows the proposed device.

The contact device consists of a cylindrical tank 1 with a flat shaft, a circulation tube 1 2 with windows 3. A propeller-type mixer 4 is placed inside the circulation tube in its ngocne part with a minimum allowable gap between the ends of the blades and the walls of the tube.

Claims (1)

Pulp loading is done by worm | loading nozzle 5. To improve unloading of large particles, the tank is equipped with a hollow pocket 6 with a reflective plate 7 and an overflow threshold in the upper part. Plates 8 are installed at the bottom of the tank to dampen the rotational movement of the pulp. The proposed device works as follows. The original pulp is fed to the upper part of the tank through the loading nozzle 5 from the side opposite to the discharge pocket 6. When the propeller stirrer 4 rotates, the pulp is pumped in a closed loop through the windows 3 and the wafer 2 down to the bottom of the tub as indicated by arrows. The pulp flows then return from the bottom to the windows in the circulation pipe. The expansion of the sump through the windows ensures a uniform flow of pulp into the circulation pipe from all levels along the height of the tank. This will ensure a uniform pulp volume of pulp throughout the volume of the tank, hence, the uniform weighing of solid particles and their processing by reagents. When windows are located above the agitator, the ejection of fluxes through the circulating pipe occurs in the zone part of the tank, while ensuring a sufficient speed of ascending flows in this zone, necessary for weighing the most 1 particles. Flows are carried out over the entire height of the tank through the windows above the mixer. This provides an effective weighing of the bath of 1FULL particles and eliminates the possibility of their settling on the bottom. If the windows in the circulation pipe are located below the agitator, the flows will be discharged over the entire height of the windows. will lead to a decrease in the bottom circulation and, ultimately, can lead to the accumulation of large grains in the lower part of the tank and a reduction in the passage of large grains through the working zone. The pulp from tank 1 is unloaded because of the new incoming flow through the discharge pocket 6 having a reflective plate 7. When the ratio of the total window area to the cross-sectional area of the circulation pipe is less than 2, 5, the number of grains passing through the agitator zone decreases, which can lead to a decrease in the efficiency of the contact tank, an increase in the time of contact of the pulp with reagents, as well as to a deterioration in the weighing of large parts of Egts. With an increase in the ratio of the total area of to the cross-sectional area of the circulation is greater than 3, 5 konour circulating pulp is shortened and reduced utilization efficiency of the top of the tank, thus decreasing the multiplicity of circulation of fine particles, resulting in degradation of processing reagents due to reduce the likelihood of passing through the work zone. The technical advantage of the proposed mixing device as compared to the known one is a more efficient and uniform weighing of particles of the whole size range and, as a result, more efficient treatment with reagents. The invention can be used to efficiently process various slurries with reagents before flotation and to intensify the processes of mixing liquids and solids in various chemical and technological processes. Apparatus of the Invention A device for contacting flotation pulp with reagents, including a tub of cylindrical shape with feed and discharge nozzles, a bushing shaft with an impeller, a circulation pipe installed concentrically to the shaft and having windows that are narrowed towards the main body, differing in that the purpose of intensifying the mixing process of the Endowment pulp with reagents, the windows of the circulation pipe are located above the impeller, while the total area of the windows is 2, 5-3, 5 times the cross-sectional area lection pipe. Sources of information taken into account in the examination 1. Patent of the Welding Company №1241890, Л, В 1C, publ. 1971.