Date: Dec. 17, 2021
The thickener is one of the common equipment in the beneficiation plant, which can be used for dehydration, drug removal, concentration, and other operations. The working efficiency of the thickener is poor, how to improve its efficiency? It is a problem that many customers care about. This article will briefly analyze how to improve the working efficiency of the thickener.
How to improve the sedimentation effect of the thickener is the key to improving the productivity of the thickener. Below we will discuss how to improve the condensing effect from five aspects.
The size of the ore particles in the slurry is different, and the sedimentation speed of the material in the water is related to its particle size. The finer the particle size, the lower the sedimentation rate, and some processes require relatively fine grinding particle size to achieve better separation indicators. Therefore, how to effectively settle the fine material is the key to improving the precipitation efficiency of the thickener. The use of flocculants can solve the problem of fine material sedimentation. Flocculants can make materials collide with each other to form flocs, increase the volume, and increase the settling speed.
It is very important to determine the stirring speed according to the time when the ore particles form flocs. In the beginning, the stirring speed is pleasant, so that the flocculant can be fully and uniformly dissolved in the slurry. When 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‰. Try to use the state to automatically control the additional amount to keep the administration and concentration constant. The selected agent should speed up the sedimentation rate and ensure the coagulation effect.
Before the pulp enters the thickener, it should go through a degassing tank for degassing to eliminate bubbles in the pulp, avoid the sticking of mineral particles on the bubbles, and affect the settling effect. The degassing tank usually lifts the bubbles to the surface of the liquid, so that the volume of the bubbles expands and explodes, and the gas escapes. The design of the degassing tank should ensure a larger degassing space to remove bubbles as much as possible. When installing the degassing tank, try to keep the upper edge of the overflow baffle in the degassing tank as level as possible, so that the slurry can pass through the baffle evenly in the form of a film to facilitate the escape of gas.
The slurry enters the sedimentation zone through the feeding barrel in the center of the thickener. In the design of the feeding port, the feeding port is moved down so that the degassed slurry directly enters the liquid surface in the tank to prevent the gas from being carried during the feeding process. Into the ore slurry. At the same time, to ensure the uniformity and stability of the feeding, the feeding pan can be added to the ore sleeve to prevent the feeding slurry from impacting the precipitated ore particles and avoid the phenomenon of “fluttering”.
The bottom structure of the thickener also affects the precipitation efficiency. At present, the common thickener in the concentrator is the rake-type thickener, which can be divided into a central transmission type and a peripheral transmission type. The main factor that affects the precipitation efficiency of the thickener is the inclination angle of the bottom of the thickener.
To discharge the sedimentary ore slurry at the discharge port at the center of the pool bottom, the thickener is designed with a cone shape at the bottom, and the sludge is continuously scraped to the discharge port at the center of the pool bottom by a rake scraper. The bottom cone has a large inclination angle, and the concentration effect is relatively good.
The automatic control system of the thickener includes control devices such as dosing, rake lifting, and underflow pump. Through the automatic control system, it is possible to monitor the changes between the various slurry layers in the thickener, and realize the more precise control of the thickener operation, so that the precipitation effect of the thickener is improved.
The above discussion is about how to improve some aspects of the thickening effect of the thickener. I hope it will be helpful to all mine owners. In actual production, you can consult a qualified thickener manufacturer according to production and economic needs, and choose a thickener that meets your needs. Improve production capacity.
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