Automatic center drive thickener is a solid-liquid separation device based on gravity settlement. It is usually a cylindrical trough with a cone bottom constructed of concrete or metal welded plates as a structural material. The slurry with a solid content of less than 10% can be concentrated by gravity sedimentation to an underflow slurry with a solid content of 45% to 55%. The thickened underflow pulp is discharged from the underflow opening at the bottom of the thickener by the action of a harrow installed in the thickener at a slow speed (1/3 ～ 1/5 r / min).
The upper part of the thickener produces a relatively clear clarified liquid (overflow), which is discharged from the circular chute on the top.
Automatic center drive thickeners are widely used in wet metallurgy, ore dressing plants, chemical plants, and other production sites that require solid-liquid enrichment and separation. The diameter is 3 to 100m and the depth is greater than 4m.
With the help of the gravity of the solid particles, the ore pulp is divided into two parts: clarified liquid and high-concentration sediment. This process is called concentration.
In the continuous operation of concentration equipment, the sedimentation and concentration process is finally divided into a clarification zone, a settlement zone, and a compression zone.
The feed ore is fed through a hollow drive shaft, and a flocculant is added thereto, and the ore pulp is rapidly dispersed due to mechanical stirring. Because the flocculant is effectively used for stirring, the thickening effect is improved. The flocculated pulp leaves the mixing chamber and is injected into the pulp settling zone, and the solids in the mine are further flocculated by contacting the flocculated material before contact. Direct contact of rising water and settling solids is common for most thickeners, but it can be avoided by injecting material into the slurry settlement zone.
If we can control the ore supply and ore discharge so that they are exactly equal, then the position of each zone can be fixed at a certain height and in a dynamic equilibrium state. At this time, the interface of each zone seems to be static.
In order to ensure the smooth progress of the concentration process, the requirements for the height of each zone are: the clarification zone should not be less than 0.5 to 1.0m, and the settlement zone should be not less than 2.0 to 2.5m.
Features
(1) Add a degassing tank to avoid solid particles from adhering to the air bubbles, like a "parachute" settlement.
(2) The feed pipe is located below the liquid level to prevent gas from being brought in during the feed.
(3) The feeding sleeve is moved down, and a receiving tray is provided to make the fed slurry fall evenly and smoothly, effectively preventing the phenomenon of over-flowering caused by the residual pressure of the mine.
(4) Adding an internal overflow weir to make the material flow according to the prescribed stroke, preventing the "short circuit" phenomenon.
(5) The overflow weir was changed to a zigzag shape, which improved the suction of local drainage caused by the unevenness of the overflow weir.
(6) Change the shape of the harrow teeth from oblique to curved, so that the slurry not only harrows toward the center, but also gives a "backlog" force to the center, which makes the underflow concentration of the ore discharge high, thereby increasing the processing capacity.
The thickener has the advantages of simple structure, convenient operation, low power consumption, and good technical indicators. The disadvantage is that it covers a large area and is not suitable for the concentration of coarse-grained materials, otherwise it is easy to plug.
In order to maintain the stability of the slurry sedimentation and concentration process, the speed of the rakers designed according to the linear speed of the edge must not exceed 7-8 m / min. For materials with thick ore particles and easy sedimentation, the linear speed of the rake can be appropriately increased. The granularity is particularly fine, and the linear speed of the rake should not be greater than 3-4 m / min.
Detailed Images
Drive System
The transmission system adopts a Chinese-foreign joint venture or imported one or more planetary gear reduction gearboxes combined with a slewing bearing, and is mounted on an adjustable base. The base is connected to the fixed base on the bridge, and the planetary gear reducer is driven by a low-speed high-torque hydraulic motor. The planetary gear reducer and the driving hydraulic motor adopt the products of Sino-foreign joint venture brand or similar imported products from abroad. The maximum operating torque of the drive unit produced by our company is 5000,000Nm.
Efficient feed bin
The design of the high-efficiency feed bin combines central feeding, automatic dilution system, and degassing of the feed slurry. Ensure that the slurry concentration in the distribution barrel can be kept within the optimal flocculation range, and the energy dissipation and deaeration are fully sufficient.
The ore slurry enters the center flow barrel along the tangential direction, and at the same time, the design of the flow channel and the baffle plate can fully ensure the best effect of flocculation mixing and further increase the sedimentation rate.
The narrow outlet of the bottom of the steady flow barrel and the feeding design can eliminate the flocculation short circuit, the impact of the feed on the central mud, shorten the settlement height, and increase the settlement rate.
Working bridge
Transmission shaft
Transmission shaft
Tie rod
Company and Factory
Yantai Hexin environmental protection equipment co., ltd is located in Yantai development zone, Shandong province。Specializing in the production ,R&D and sales of all kinds of filtering equipment. Company engaged in filter industry more than 20 years by an experienced team of production, research,development,sales and service,has a perfect product processing, quality assurance and after-sales service system, walking at the forefront of filter in industry.
Company’s main products are horizontal vacuum filter, ceramic filter, vertical filter press, high efficiency thickener, intelligent press filter, belt filter press, centrifuge, tubular filter and other equipment.It is widely used in chemical industry, mining, metallurgy, fertilizer, medicine, food, paper, sewage treatment, tailings treatment and other industries.
Company adhering to the " strives for the survival by the quality, credibility and development" business philosophy, to provide users with high-quality filtration equipment and perfect after-sales service, we sincerely welcome customers at home and abroad ,experts and friends to join hands in creating a better future.
Packing&Shipping
We have established a logistics department consisting of 10 engineers, which is responsible for packaging, loading and global overseas freight. We will make full preparations according to customers' packaging and transportation requirements. Make sure that the goods are delivered to customers safely and quickly.
