denver D12 flotation cell for laboratory

Denver flotation cell D12 laboratory model

XFD-12 laboratory multi-cell floatation machine is applicable to floatation of non-ferrous and ferrous metals, nonmetals and coal with the size fraction less than -35 meshes and can be used in floatation test of 125-3000g floatation samples.

Specifications and Technical Parameters

III. Structure Introduction

XFD-12 laboratory multi-cell floatation machine consists of the following main components: elevating mechanism (IV), mechanical stepless variable-speed mechanism (II), machine head part (I), stator and rotor part (V) and control switch (III).

All the components are connected with the column (7). The main shaft rotates clockwise. Power is transmitted via the motor belt (5), triangular belt (3) and main shaft belt pulley (2) to the main shaft (1) to drive the impeller to rotate. The impeller speed can be adjusted by loosening the speed governing cap (12) and turning the speed governing screw (6). The tachometer (9) is connected with the upper end of the main shaft using a coupling to measure the impeller speed.

The main shaft impeller is lifted and lowered by shaking the handle (10) and pulling out the knob (11) at the same time. After shaking to the needed position, put back the handle. Then the main shaft is fixed at this position.

The cell is fixed on the square holes of the base (8) using four cylindrical pins beneath the cell bottom.

IV. Methods of Installation, Adjustment and Operation

The floatation machine is installed on the workbench and its levelness can be adjusted using four base screws.

Check for its rotation direction before the motor is powered on. The main shaft impeller driven by the motor is required to rotate clockwise;

The speed of the floatation machine is adjusted by the handhold directly on the machine cover. The speed can be adjusted only when the machine is running;

The impeller of the floatation machine is lifted and lowered by shaking the handle and pulling out the small knob at the same time. Note that the small knob cannot be put back when the impeller is lifted/ lowered. It can be put back after determining the position. Meanwhile, take care to pull out and put back the small knob lightly. The elevating mechanism can be fixed at any needed height in order to adapt to the best mixing conditions.

The impeller, stator and hollow shaft can be replaced. The impeller is connected with the right-handed screw of the main shaft, the stator is connected with the left-handed screw of the hollow sleeve, and the hollow shaft is connected with the machine head on a left-handed basis. Pay attention to the rotation direction during replacement;

The circulating cylinder (13) is connected with the stator uniformly using three rubber belts.

The tachometer can be connected with or disconnected from the main shaft as needed. By turning the tachometer by 90° anticlockwise, it can be connected to read the rpm. By turning the tachometer by 90° clockwise, it is disconnected.

Note that the tachometer coupling on the machine cover must be aligned with the bush center hole during machine cover installation. The fixing nut can be held down tightly only when the speed governing screw is turned to the highest position.

Triangular belt installation: slide the fixed shaft of the motor along the machine head hole, adjust the tightness well, tighten the fixing screws on the two sides of the machine head, and fix the motor. High main shaft speed can be obtained by appropriately increasing the belt’s center distance; on the contrary, low main shaft speed can be obtained by appropriately reducing the center distance.

Scrubber installation: dismantle the hollow shaft and screw on the accessory XFD-12-00-05 bearing gland; install the accessory XFD12-00-03 one-way mixing impeller or XFD-12-00-04 two-way mixing impeller on the main shaft screws. XFD-12-00-02 mixing tank is installed on the square hole of the base. The scrubbing effect is the best with 70%-75% high concentration ore pulp at about 800 rpm in general.

V. Maintenance and Attentions

The valve on the hollow shaft is the main valve for switching off/on the air circuit. The valve on the flowmeter is a fine adjustment valve. Pay attention to the starting/closing sequence and prevent ore pulp from rushing into the flowmeter. The starting sequence: start the motor—open the main valve—open the fine adjustment valve; the shutdown sequence: close the main valve—stop the motor.

The seal ring at the upper end of the hollow shaft shall be checked regularly to prevent ore pulp leakage into the bearing caused by seal ring damage from damaging the bearing.

Check for air tightness in clear water during initial running after installation and repair. That is, after closing the main valve and starting the main shaft, there shall be no air bubble out of the periphery of the stator, the added clear water volume shall be in line with the nominal volume of the cell, and the speed is the highest speed in case of not exhausting air from the circulating cylinder.

There is no special requirement for lubrication of the machine’s moving part. Inject instrument oil to the tachometer regularly.

After the flowmeter is detached from the system, the air inflow of the machine will vary very greatly. Pay attention to this during use.

VI. List of Wearing Parts and Accessories

List of Wearing Parts