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A method of filtering slurry into filtrate

A slurry and filtrate technology, applied in the chemical industry, can solve the problems of cumbersome methods, inability to effectively control the moisture of the filter cake, the thickness of the filter cake layer, difficult to operate, etc. Effect

Active Publication Date: 2020-05-22
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this scheme is that the method is cumbersome and not easy to operate, and it cannot effectively control the moisture content of the filter cake and the thickness of the filter cake layer.

Method used

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  • A method of filtering slurry into filtrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a method of filtering slurry into filtrate. The process flow of this embodiment is as figure 1 As shown, the slurry stirring tank 1 is connected with the vertical filter press 2 through a feed pipe, the discharge pipe of the vertical filter press 2 is connected with the filtrate buffer tank 3, and a connected slurry stirring tank 1 is provided on the feed pipe The first return pipe 4 of the discharging pipe is provided with a second return pipe 5 that communicates with the mixing tank 1. The specific method of this embodiment is:

[0051] (1) Filtration system cleaning and preheating: close the valve that enters the vertical filter press 2, and circulate the slurry in the feed pipe and the first return pipe 4 through the transfer pump, and the pipes are cleaned and preheated simultaneously , The control time is 180s, and the filter cloth of the vertical filter press 2 is preheated with washing water for 200s. The filter cloth is made of polypropy...

Embodiment 2

[0057] This embodiment provides a method of filtering slurry into filtrate. The process flow of this embodiment refers to embodiment 1, and the specific method is:

[0058] (1) Filtration system cleaning and preheating: close the valve that enters the vertical filter press 2, and circulate the slurry in the feed pipe and the first return pipe 4 through the transfer pump, and the pipes are cleaned and preheated simultaneously , The control time is 230s, and the filter cloth of the vertical filter press 2 is preheated with washing water for 250s, the filter cloth is made of polypropylene, and the air permeability is 4L / (m 2 ·S), the breaking strength is 6000N / 25mm in warp direction and 1800N / 25mm in weft direction.

[0059] (2) Low-pressure formation of filter cake layer: Step (1) After the operation is completed, close the first return pipe 4, open the second return pipe 5 and the feed valve of the vertical filter press 2, and control the feed pressure to 0.2MPa to the vertical The...

Embodiment 3

[0064] This embodiment provides a method of filtering slurry into filtrate. The process flow of this embodiment refers to embodiment 1, and the specific method is:

[0065] (1) Filtration system cleaning and preheating: close the valve that enters the vertical filter press 2, and circulate the slurry in the feed pipe and the first return pipe 4 through the transfer pump, and the pipes are cleaned and preheated simultaneously , The control time is 300s, and the filter cloth of the vertical filter press 2 is preheated for 310s with washing water. The filter cloth is made of polypropylene and the air permeability is 4.5L / (m 2 ·S), the breaking strength is 7000N / 25mm in warp direction and 2000N / 25mm in weft direction.

[0066] (2) Low pressure formation of filter cake layer: Step (1) After the operation is completed, close the first return pipe 4, open the second return pipe 5 and the feed valve of the vertical filter press 2, and control the feed pressure to 0.25 MPa to the vertical ...

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Abstract

The invention provides a method for filtering slurry into filtrate. The method comprises the following steps: in a filtering device, firstly, forming the slurry into a filter cake layer at low pressure, and then carrying out high-pressure filtering to obtain the filtrate. The method for filtering the slurry into the filtrate is easy in operation and good in safety, through a technical scheme thatlow-pressure filtering is firstly carried out to form the filter cake layer and the formed filter cake is then used for carrying out high-pressure filtering, a penetration filtering problem which is in the presence when an existing traditional technology adopts filter cloth with a high ventilation amount is solved, a filtering process is quick and efficient, and the obtained filtrate is clean filtrate. According to the method provided by the invention, filtering accuracy is less than or equal to 3 mu m, the moisture rate of the filter cake is less than or equal to 17 percent, and the thicknessof the filter cake is greater than or equal to 14mm. In addition, the filtering device is cleaned and preheated, so that the problem in a traditional technology that a filtering effect is affected since crystal is generated in the slurry is effectively avoided, meanwhile, the influence problem that filter cloth is blocked by pipeline residues is solved, and no filtering deviation phenomena are generated.

Description

Technical field [0001] The invention relates to the field of chemical engineering, in particular to a method for filtering slurry into filtrate. Background technique [0002] At present, the traditional methods used to filter the reaction slurry in the traditional vanadium chemical process in China include disc vacuum filters, horizontal filter presses, vertical filter presses, belt filters, etc. In order to ensure the filtration speed, the traditional filtration method generally adopts a large air permeability of the filter cloth. Although the filtration speed is increased, the problem of the penetration of small particles due to the larger filter holes, and the current filtration of many processes is clean filtrate , Because the residue in the pipeline will block the filter cloth and affect the filtering speed. The slow filtering speed and the unpreheated pipeline will cause the temperature of the slurry to drop, and crystals will affect the filtering effect. The traditional f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D37/00
Inventor 李兰杰王海旭赵备备杜浩赵亮
Owner HEBEI IRON AND STEEL