Vertical filter press

Vertical filter press Vertical filter press, also known as filter cloth full-travel automatic filter press, appeared in the former Soviet Union in the 1960s. Later, Germany, Finland, the United States and other countries also successively manufactured this kind of filter. Used for the filtration of nickel concentrates, zinc oxide leachate, enzymes, starch, alkali residues, zeolites, copper concentrates and other products. Vertical automatic filter press is the use of high-pressure extrusion and high-pressure gas drying, the filter in the slurry hydraulic pressure to achieve solid-liquid separation. It also has three major functions of washing, dehydration and air drying.

The main features (1) The use of vertical structure design, small footprint, make full use of the principle of gravity to optimize the operation cycle.

(2) Set filtering, washing (can be achieved many times), extrusion, air drying, discharging and integration, so as to simplify the process.

(3) The filter cake is placed horizontally in the filter chamber and can be efficiently and uniformly filtered. The filter cake has a low moisture content.

(4) Filtrate and high pressure air are discharged in the form of undercurrent, reducing pollution to the operating environment.

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

(6) The gravity and pressure of the liquid itself are utilized, thereby saving energy consumption and reducing costs.

(7) The filter cake has less moisture and can generally reach about 9%.

(8) The filter cloth can be automatically cleaned and used automatically.

Basic institutions at home and abroad vertical filter press the basic structure and work process is very similar, the basic structure of the main pressure plate, lower plate, filter plate group, piston rod, hydraulic cylinder, hydraulic valve, frame and control cabinet and other components.

Working Principles There are six processes for the long-term process control of the vertical filter press: Filtration: Pumping the material suspension; Primary diaphragm squeezing: Extrusion of the filter cake; Filter cake washing: Washing with water; Secondary diaphragm squeezing: The filter cake is re-extruded; the filter cake is blow-dried: the high-pressure air is blown dry to remove a small amount of water; the filter cake is discharged and the filter cloth is washed: the filter cake is dropped on both sides and discharged, and the filter cloth is washed at the same time.

There are four processes in the short program control operating mode: filtration, diaphragm extrusion, cake drying, filter cake discharge, and filter cloth washing.

1 Filter When the filter plate frame is closed, the slurry enters each filter chamber through the slurry pipe at the same time. The filtrate passes through the filter cloth into the filtrate chamber, then into the filtrate hose, and finally to the filtrate tube.

2 A diaphragm squeezes high-pressure water through the high-pressure water hose and enters the diaphragm. The diaphragm squeezes the filter cake against the surface of the filter cloth so that the filtrate is squeezed out of the filter cake.

3 Cake Wash Wash solution is pumped to the filter chamber via the same path as the slurry; as the liquid fills the filter chamber, the diaphragm is lifted and the water squeezes out of the diaphragm. The washing liquid flows into the discharge pipe after passing through the filter cake and the filter cloth.

4 Secondary Membrane Extrusion The washing solution remaining in the filter chamber after the washing stage is extruded in the second stage above.

5 Filter cake drying The final drying of the filter cake is done with compressed air. The air entering through the distribution tube fills the filter chamber and lifts the diaphragm so that the high pressure water on the diaphragm exits the filter. The airflow through the filter cake reduces the moisture content to an optimum level while evacuating the filtrate chamber.

6 cake discharge and filter cloth washing When the drying process is completed, the plate frame assembly is opened, the filter cloth drive mechanism starts running, 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 rinses both sides of the filter cloth to ensure that the filtering effect is consistent, without adding any devices. The difference between the vertical filter press and the other filter press The common point of the vertical filter press, horizontal press filter, and belt filter press is that a filter cloth is used to form a pressure difference and the liquid is leached through the filter cloth. The solids are blocked by the filter cloth and blocked on the filter cloth, which is commonly known as "dehydration". But different types of filter presses have different ways of filtering the filters, so the best way to distinguish them is to look at the filter structure to distinguish them.

The distinction between vertical and horizontal filter presses is that the filtering structures of the two types of filter presses are arranged in an orderly arrangement of filter cloths, but the arrangement direction is not the same, horizontal The filter press is placed vertically, while the vertical is placed horizontally. There are also different filter cloths. The filter cloth of the horizontal filter press is made of a square piece of filter cloth, that is, how many filter plates have the same number of filter cloths. The vertical filter press has only one filter cloth, which is a filter cloth tape connected end to end. It shuttles back and forth between each vertical filter plate.

The difference between a vertical filter press and a belt filter press. These two types of filter press equipment have common features, they all have a filter cloth connected end to end, but the difference lies in the filter plate. The filter cloth under the belt filter press may only be a low-pressure device such as a vacuum chamber or a vacuum chamber, and the vertical filter press is followed by a piece-by-piece filter plate. This is the difference between the two of them. The essence of the difference is that the cause of the difference in the pressure of the filtered power is not the same. The vertical type uses the gravity of the body fluid and the mechanically applied pressure, while the belt type uses the atmospheric pressure.