How To Improve The Thickener Working Efficiency?

2021-08-07

The measures to improve the efficiency of the thickener generally include the effective use of flocculants, increasing the depth of the thickening tank, and increasing the thickness of the sedimentary layer. The thickener is mainly used for solid-liquid separation operations such as concentration and wastewater treatment. The ore slurry with a solids content of 10% to 20% can be concentrated by gravity sedimentation into an underflow slurry with a solids content of 45% to 55%.

1. Reasonable use of flocculants

The size of the flocs in the thickener determines the settling speed, which is related to the molecular weight of the flocculant and the speed of addition. Using a flocculant with a molecular weight of 5 to 20 million and adding it at a slow speed is conducive to the formation of large flocs. It is important to determine the stirring speed according to the time when the ore particles form flocs. Make the flocculant fully and evenly dissolved in the pulp. After the particle flocs are formed, the stirring speed should be appropriately reduced to avoid damage to the newly formed flocs due to the high speed. It is advisable to dilute the flocculant to between 0.1‰ and 0.25‰, and use automatic control of the added amount as much as possible to keep the dosage and concentration constant. The selected agent should be able to speed up the sedimentation rate and ensure the agglomeration effect.

2. Determine the dosage

The effect of the high-efficiency thickener to thicken the pulp depends on whether the dosage is appropriate. The small amount of medicine cannot achieve the rapid consolidation and settlement of tailings particles, resulting in overflow and muddy. The amount of medicine is too much and it is not economical.

3. Degas the slurry

The air contained in the pulp will reduce the specific gravity of the solid particles and float up, forming foam, which will affect the flocculation effect. Add a degassing device before the mining pipe to eliminate the air in the slurry, which can reduce the dosage and improve the flocculation effect.

4. Automatic control

The automatic control is to feedback the concentration parameters such as the thickness of the sedimentation layer and the interface position of the clarification layer, the underflow concentration and flow rate, the overflow concentration, and the torque of the main engine, which are detected by the instrument, to the automatic control system.