Introduction of vertical filter press

    Vertical filter press: also known as filter cloth full walking automatic filter press. It appeared in the former Soviet Union in the 1960s. Later, Germany, Finland, the United States and other countries have also made this kind of filter, which is widely used in the filtration of nickel concentrate, zinc oxide leaching solution, enzyme, starch, alkali residue, zeolite, copper concentrate and other products.

1. Features

(1) The vertical structure design is adopted, which occupies less space and makes full use of the gravity principle to optimize the operation cycle process.

(2) It integrates filtration, washing (can be realized for many times), extrusion, air drying and unloading, so as to simplify the process flow.

(3) The filter cake placed horizontally in the filter chamber can filter efficiently and evenly, and the moisture content of the filter cake is low.

(4) The filtrate and high-pressure air are discharged in the form of dark flow, which reduces the pollution to the operating environment.

(5) Fully automatic operation reduces the labor intensity of operators.

2. Basic institutions

The basic structure of vertical filter press is mainly composed of upper pressure plate, lower pressure plate, filter plate group, piston rod, hydraulic cylinder, hydraulic valve, frame and control cabinet.

3. How it works

     The long program control working mode of vertical filter press has six processes: filtration: pumping material suspension; primary diaphragm extrusion: extruding filter cake; filter cake washing: washing with clean water; secondary diaphragm extrusion: re extruding filter cake; blow drying of filter cake: drying with high pressure air, taking away a small amount of water; discharging filter cake and washing filter cloth: dropping filter cake from both sides, unloading material, and washing filter cloth at the same time.

The short program control mode has four processes: filtration, membrane extrusion, cake drying, cake discharge and cloth washing.

① Filtration when the filter plate frame is closed, the slurry enters each filter chamber through the slurry pipe at the same time. The filtrate enters the filtrate chamber through the filter cloth, then enters the filtrate hose, and finally reaches the filtrate pipe

② The high pressure water is squeezed by the primary diaphragm into the upper part of the diaphragm through the high-pressure water hose, and the diaphragm squeezes the filter cake on the surface of the filter cloth, thus squeezing the filtrate out of the filter cake

③ The washing solution of filter cake is pumped to the filter chamber through the same path as the slurry; as the liquid fills the filter chamber, the diaphragm is lifted and water is squeezed out from above the diaphragm. After passing through the filter cake and filter cloth, the washing liquid flows into the discharge pipe

④ The secondary diaphragm squeezes the washing solution remaining in the filter chamber after the washing stage

⑤ After the filter cake is blown dry, the later drying of the filter cake is completed by compressed air. The air entering through the distribution pipe fills the filter chamber. The high pressure water on the diaphragm is lifted and discharged from the filter. The moisture content is reduced to a better degree by the air flow of the filter cake, and the filtrate chamber is emptied at the same time

⑥ Discharge of filter cake and washing of filter cloth when the drying process is completed, the plate and frame components are opened, the driving mechanism of filter cloth starts to operate, and the filter cake on the filter cloth is discharged from both sides of the filter. At the same time, the washing device installed in the filter press flushes both sides of the filter cloth to ensure the consistent filtering effect without adding any device

     The vertical automatic filter press uses the function of high pressure extrusion and high pressure air drying to press out the filtrate in the slurry to achieve solid-liquid separation. It has three functions of washing, dehydration and air drying at the same time

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