JPS6347492B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a dehydration method in which an endless band-shaped filter cloth is provided in a state where it can be rotated from a gravity dewatering section to a forced dehydration section, and a device is provided for supplying a material to be treated to the gravity dewatering section. Regarding machines.

In the above-mentioned dehydrator, there is a limit to the dewatering capacity in the gravity dehydration section, and the processed material taken out from there has a high moisture content and high fluidity, so the processed material is transferred to the forced dehydration section. When dewatering is carried out using two filter cloths, the material to be processed tends to protrude between the filter cloths, so the material to be processed must be made thinner and pressure dehydrated, resulting in lower processing capacity and the need for larger dewatering equipment. There was a flaw that became a problem.

In view of the above-mentioned circumstances, it is an object of the present invention to greatly improve the dehydration processing capacity by adding an extremely simple structure, and thereby make it possible to downsize the dewatering equipment.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

A large number of rollers 2 are installed in a zigzag pattern in the lower part of the gravity dehydration area 1, which has a large number of small holes in its upper surface, and a pair of upper and lower filter cloth driving rollers 3, 3 are installed at one end of the gravity desorption area 1. and filter cloth tensioning rollers 4, 4 are provided on the other end side, and furthermore, a cake thickness adjustment roller 5 and a filter cloth meandering correction roller 6 are provided, and two rollers are provided across these roller groups. The endless filter cloths 7, 7 are wound in a state in which they are overlapped with each other and are passed through the group of rollers 2 arranged in a zigzag manner, and then, near the upper driving roller 3, a filter is placed from the supply section 15. A tank 9 equipped with a device 8 for agitating and supplying the material to be processed, and a dewatered cake recovery tank 10 below the lower driving roller 3.
The above-mentioned equipment is arranged in the vertical direction, and the filter cloths 7, 7 are sandwiched between the gravity dewatering section A by the gravity dewatering section 1 and the rollers 2 arranged in a zigzag manner. The dehydrator is configured to dehydrate the material to be treated and to take out the dehydrated cake to the recovery tank 10 using the forced dewatering section B using pressure shearing.

A supply device 11 for a flocculant such as iron sulfate is provided in the supply tank 9 of the material to be treated, and the flocculant is mixed into the material to be treated prior to supplying the material to the gravity dehydration section A. Then, the concentrated material to be treated is supplied to the gravity dehydration section A, and the gravity dehydration section A
It is designed to improve dehydration performance.

A receiving tank 12 for gravity-dehydrated workpieces is provided below the tension roller 4 on the terminal side of the gravity dewatering section A, and a supply device 13 for supplying moisture-absorbing materials such as sawdust, quicklime, and incinerated ash to the receiving tank 12. , and a device 14 for kneading the moisture-absorbing material and the material to be treated after gravity dehydration. The material is supplied to the forced dehydration section B.

Although a dehydrator in which dehydrating equipment is arranged vertically in parallel has been exemplified, the present invention may also be implemented with a dehydrator having one dehydrating equipment;
The properties of the flocculant and absorbent are unsuitable.

In summary, the present invention provides the above-mentioned dehydrator with a device 11 for supplying an agglomerate to the treated material supplied to the gravity dehydration section A, and also provides a It is characterized by being provided with a device 13 for supplying a moisture absorbing material to the object to be processed.

In other words, by aggregating the material to be treated before supplying it to the gravity dehydration section A and concentrating the material, the dewatering performance in the forced dehydration section B can be greatly influenced. The dehydration performance of the gravity dewatering section A can be greatly improved, and the processed material whose water content has been reduced can be further subjected to moisture absorption treatment to further reduce the water content of the processed material with low fluidity. By supplying the water to the forced dewatering section A, efficient clamping pressure dehydration can be performed in the forced dewatering section B to increase the thickness of the material to be treated between the filter cloths 7, 7, and as a whole,
By adding simple equipment, the dewatering performance of each of the gravity dewatering section A and the forced dewatering section B can be greatly improved.
This has also made it possible to downsize the dewatering equipment itself.

[Brief explanation of the drawing]

The drawing is a schematic longitudinal sectional side view illustrating an embodiment of the dehydrator according to the present invention. 7... Endless belt-shaped filter cloth, 8... Processing material supply device, 11... Coagulant supply device, 13... Moisture absorbing material supply device, A... Gravity dewatering section, B... Forced dewatering section.

Claims (1)

[Claims] 1. A dehydrator in which endless band-shaped filter cloths 7, 7 are provided in a state where they are rotated from gravity dehydration section A to forced dehydration section B, and a device 8 is provided for supplying the material to be treated to gravity dehydration section A. In addition, the gravity dehydration section A
Apparatus 1 for supplying a flocculant to a processed material supplied to
1 and a device 13 for supplying a moisture absorbing material to the processed material after gravity dewatering, which is supplied to the forced dewatering section B.