The first step of pressing: Before the filter press operation, the whole machine must be inspected: check whether the filter cloth is folded or overlapped, and the power supply has been connected normally. After the inspection, the pressing operation can be performed. First press the “Start” button, the oil pump starts working, and then press the “pressing” button again, the piston pushes the pressing plate to press, when the pressing force reaches the set high pressure The hydraulic system automatically stops.

The second step material: when the filter press is pressed, the feeding operation can be performed: the feed pump is turned on, and the feed valve is slowly opened, and the feed pressure is gradually increased to the normal pressure. At this time, observe the liquid output of the filter press and the leakage between the filter plates. After filtering for a period of time, the liquid output from the filter press is gradually reduced. At this time, the filter residue in the filter chamber is gradually filling, when the liquid outlet is not out. When the liquid or only a small amount of liquid, it is proved that the filter residue in the filter chamber is completely filled to form a filter cake. If the filter cake needs to be washed or air-dried, it can be carried out subsequently, and the unloading operation can be carried out without washing or air drying.

The third step of washing or air drying: after the filter cake is filled, the feed pump and the feed valve are closed. Open the washing pump or air compressor, slowly open the washing liquid or air inlet valve, and wash or air dry the filter cake. After the operation is completed, the washing machine or the air compressor and its valves are closed, and the unloading operation can be performed.

The fourth step of unloading the cake: first close the feed pump and feed valve, into the washing liquid or air inlet device and valve, and then press the "release" button on the operation panel, the piston rod drives the pressure plate to retreat, retreat to the appropriate After the position, release the “release” button, and manually pull the filter plate to remove the filter cake, and at the same time clean the filter residue stuck on the sealing surface to prevent the filter residue from being caught on the sealing surface to affect the sealing performance and cause leakage. At this point, an operation cycle is completed.

First, the basic principle

1. The basic working principle of the old filter press is as follows:
The filter part of the filter press: 1) thrust plate, 2) filter plate, 3) compression plate, 4) the working principle of the filter cloth is as follows: the compression plate is pressed by the external force PI, and the filter plates are pressed tightly. A cavity is formed between each of the filter plates. The solid-liquid mixture is pumped into each chamber under the action of the infusion pump. The liquid passes through the filter cloth and is discharged through the dark hole of the filter plate, while the solid is blocked by the filter cloth and gradually accumulates in the cavity of the filter plate to form filter residue. In order to facilitate the collection and transportation of filter residue, and also to avoid re-contamination of the environment, it is generally required that the water content of the filter residue when the filter plate is discharged is 75%.
It can be seen that the volume of the filter chamber formed between the filter plates cannot be changed.
2. Technical innovation points:
The filter plate combination is composed of a filter plate, a rigid block and a filter frame. The filter press presses the filter plates under the action of the external force PI. When the infusion pump stops working, the rigid spacer is removed, and a space is formed between the filter plate and the filter frame, and the space will be closed by the external force P3. The lateral distance of the filter plate cavity will be reduced, i.e., the width C of the rigid block will be reduced. Since the filter residue in the filter chamber contains a certain moisture content, the reduction of the volume of the filter plate cavity will cause a part of the moisture in the filter residue to be squeezed out, that is, the moisture content of the filter residue will be lowered.
The characteristics of the plate filter press are:
(1) Under the same working conditions (such as the power of the infusion pump and its working time, etc.). The plate filter press can utilize mechanical external force to reduce the volume of the filter plate cavity and extrude the moisture in the filter residue, so that the water content is further reduced.
(2) At present, the filter water content of any brand filter presses at home and abroad decreases with the extension of the working time of the infusion pump. From the working time of the infusion pump-the slag moisture content characteristic curve, the infusion pump working time-filter slag moisture content characteristic curves are very similar. In the first 3 hours of the start of the infusion pump, the moisture content of the filter residue decreased significantly, from the initial 99% to about 82% (down 17%), after which the infusion pump worked again for about 5 hours, the water contained The rate will drop to about 75% (a drop of only 7%). The plate filter press fully utilizes the working time of the infusion pump—the characteristic of the moisture content curve of the filter residue. After the infusion pump works for 3 hours, it stops its work, removes the rigid block, and squeezes part of the moisture in the filter residue with an external force P3. The water content of the filter residue can be rapidly reduced to about 75%, which greatly shortens the time for the filter residue to pass through the filter plate-filter frame and improves the working efficiency. It can be seen that the plate filter press is an energy-saving and efficient environmentally friendly product.

Second, the key to technology 1, a reasonable match between the infusion pump and the filter press

2. Reasonably choose different filter cloths for different filter residue

Third, the main technical indicators and conditions

1. The filter press can work continuously for 24 hours, from the original 2 shifts per day to 4 shifts per day.
2, the infusion pump works 6 hours filter residue moisture content from 99% to 75%

Fourth, the main equipment and operation management

1. Main equipment Sewage lift pump, plus pump, mixer, air compressor, infusion pump, filter press.
2, operation management system automation is high, liquid level float control sewage pump operation, plus * pump, mixer and lift pump linkage, acid and alkali pump are controlled by pH meter operation, other equipment according to system processing needs to run. The whole process of the filter press can be semi-automated.

V. Analysis of investment benefits (users)

1. Investment situation

The total investment is 6 million yuan, of which, the equipment investment is 4 million yuan. The life of the main equipment is 15 years, and the operating cost is 1.36 million yuan/year.

2. Analysis of economic benefits

(1) can shorten the entire filter press cycle and improve work efficiency by about 60%;
(2) It can save about 37.5% of energy, easy to operate, convenient for maintenance and repair;
(3) The annual investment cost savings is about 43%, and the investment cost can be recovered in about two years;
(The life of the filter press is 7~10 years)
(4) The slag has a low moisture content, which is easy to collect and transport, and has no secondary environmental pollution.

3. Environmental Benefit Analysis

Each year, the total copper discharge of pollutants can be reduced by 8767kg, total ***35609kg, COD value is 25748kg, which greatly reduces the pollution of water environment, saves water resources and avoids environmental disputes.