Method for filtering slurry into filtrate

A technology of filtrate and slurry, which is applied in the chemical industry, can solve the problems of difficult operation, cumbersome methods, inability to effectively control the water content of the filter cake, and the thickness of the filter cake layer, and achieve efficient and rapid filtration, high efficiency, and fast and efficient filtration process Effect

Active Publication Date: 2018-01-30
HEBEI IRON AND STEEL
View PDF8 Cites 0 Cited by
  • 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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for filtering slurry into filtrate

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0049] Example 1

[0050] This embodiment provides a method for filtering slurry into filtrate. The technological process of this embodiment is as figure 1 As shown, the slurry mixing tank 1 communicates with the vertical filter press 2 through the feed pipeline, the discharge pipeline of the vertical filter press 2 communicates with the filtrate buffer tank 3, and the connecting slurry mixing tank 1 is set on the feeding pipeline. The first reflux pipeline 4 is provided with the second reflux pipeline 5 communicating with the mixing tank 1 on the discharge pipeline. The concrete method of this embodiment is:

[0051] (1) Filtration system cleaning and preheating: close the valve entering the vertical filter press 2, circulate the slurry in the feed pipeline and the first return pipeline 4 through the delivery pump, and clean and preheat the pipeline synchronously , the control time is 180s, and the filter cloth of the vertical filter press 2 is preheated with washing water...

Example Embodiment

[0056] Example 2

[0057] This embodiment provides a method for filtering slurry into filtrate. The technological process of the present embodiment is with reference to embodiment 1, and concrete method is:

[0058] (1) Filtration system cleaning and preheating: close the valve entering the vertical filter press 2, circulate the slurry in the feed pipeline and the first return pipeline 4 through the delivery pump, and clean and preheat the pipeline synchronously , 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 fiber, 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) Form filter cake layer under low pressure: close the first return pipeline 4 after step (1) operation is completed, open the second return pipeline 5 and vertical filter press 2 feeding valves, control feed pr...

Example Embodiment

[0063] Example 3

[0064] This embodiment provides a method for filtering slurry into filtrate. The technological process of the present embodiment is with reference to embodiment 1, and concrete method is:

[0065] (1) Filtration system cleaning and preheating: close the valve entering the vertical filter press 2, circulate the slurry in the feed pipeline and the first return pipeline 4 through the delivery pump, and clean and preheat the pipeline synchronously , the control time is 300s, and the filter cloth of the vertical filter press 2 is preheated with washing water for 310s. The filter cloth is made of polypropylene fiber, 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) filter cake layer is formed under low pressure: after the operation of step (1), close the first return pipe 4, open the second return pipe 5 and the feed valve of the vertical filter press 2, and control th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Air flowaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

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 industry, in particular to a method for filtering slurry into filtrate. Background technique [0002] At present, the traditional methods for filtering the reaction slurry in the domestic traditional vanadium chemical process include disc vacuum filter, horizontal filter press, vertical filter press, belt filter and so on. In order to ensure the filtration speed in the traditional filtration method, the air permeability of the filter cloth generally used is too large. Although the filtration speed is improved in this way, because of the large filter holes, there is a problem of penetration of tiny particles, and many current filtration processes are clean filtrates. , because the residues in the pipeline will block the filter cloth and affect the filtration speed. The slow filtration speed and the lack of preheating of the pipeline will cause the temperature of the slurry to drop, and crystals will affect ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01D37/00
Inventor 李兰杰王海旭赵备备杜浩赵亮
Owner HEBEI IRON AND STEEL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products