阅读说明：本技术 一种钛白粉液雾洗涤干燥工艺 (Titanium dioxide liquid-mist washing and drying process ) 是由 肖利亚 何向阳 于 2020-12-31 设计创作，主要内容包括：本发明提供一种钛白粉液雾洗涤干燥工艺,包括充液、预过滤、过滤、排残液、洗涤、蒸汽干燥、反吹脱饼步骤。洗涤可选静态洗涤或者气液混合洗涤或者二次打浆洗涤或者液雾+蒸汽洗涤,其中,气液混合洗涤或者液雾+蒸汽洗涤将清洗水和/或溶剂通过螺旋雾化喷头喷入集束式过滤器内对钛白粉浆液进行洗涤,除去可溶性盐,提高钛白粉纯度。该工艺处理钛白粉包膜浆液流程较短,仅需要在集束式过滤器内进行洗涤、干燥,封闭式处理,无需人工参与；可选用四种不同的洗涤工艺,采用清洗水和/或溶剂提高浆液中的可溶性盐溶解性,几次洗涤即可达到合格的电导率；由于采用高温雾化洗涤,相比传统的压滤机,节省了大量的水资源,提高洗涤、干燥的效率。(The invention provides a titanium dioxide liquid mist washing and drying process which comprises the steps of liquid filling, prefiltering, filtering, residual liquid discharging, washing, steam drying and back flushing and cake removing. The washing can be static washing or gas-liquid mixed washing or secondary pulping washing or liquid fog and steam washing, wherein the gas-liquid mixed washing or the liquid fog and steam washing sprays cleaning water and/or solvent into the cluster filter through the spiral atomizing nozzle to wash the titanium dioxide slurry, remove soluble salts and improve the purity of the titanium dioxide. The process for treating the titanium dioxide coating slurry is short in flow, only needs to be washed and dried in a cluster filter, is subjected to closed treatment, and does not need manual participation; four different washing processes can be selected, the dissolubility of soluble salt in the slurry is improved by adopting washing water and/or a solvent, and qualified conductivity can be achieved by washing for several times; because the high-temperature atomization washing is adopted, compared with the traditional filter press, a large amount of water resources are saved, and the washing and drying efficiency is improved.)

1. A titanium dioxide liquid mist washing and drying process is characterized by comprising the following steps:

the method comprises the following steps: liquid-filled

Injecting the titanium dioxide slurry in the coating slurry tank into the cluster filter through a centrifugal pump;

step two: prefiltering

The titanium dioxide slurry is pre-filtered by the cluster filter, the slurry containing fine particles is discharged into the flat ceramic membrane filter from the cluster filter, and the slurry containing large particles is intercepted outside a filter element of the cluster filter;

step three: filtration

Filtering slurry containing fine particles by using a flat ceramic membrane filter, discharging the generated clear liquid into a clear liquid tank, returning the concentrated liquid into the cluster filter for secondary filtration, and filtering for a period of time to form a filter cake layer on the surface of a filter element of the cluster filter to form deep filtration which can intercept finer particles;

step four: discharging residual liquid

When the pressure difference of the inlet and the outlet of the cluster filter reaches a set value, stopping filtering, introducing compressed air from an overflow port of the cluster filter for positive pressure discharge, and returning the unfiltered titanium white slurry to the coating slurry tank by the compressed air, wherein the compressed air flows through the surface of the filter element, so that the liquid in the filter cake on the surface of the filter element can be fully replaced;

step six: washing machine

After the filtration is finished, discharging the concentrated solution in the cluster filter, and sending cleaning water and/or solvent to the cluster filter to wash filter cakes on the surface of the filter element;

step seven: steam drying

After washing is finished, purging and drying the filter cake on the surface of the filter element through high-temperature steam, draining the water in the filter cake, and circularly washing in the step six for multiple times until the conductivity of the washing water is 100us/cm after washing;

step eight: back-blowing cake

And after the steam drying is finished, the pressure of the cluster filter is removed, gas is injected into a filtrate outlet of the cluster filter, the filter element is subjected to back flushing, and a filter cake after vibration crushing is discharged.

2. The titanium dioxide liquid-spray washing and drying process according to claim 1, wherein the washing in the sixth step is static washing or gas-liquid mixing washing or secondary pulping washing or liquid-spray + steam washing.

3. The titanium dioxide liquid-mist washing and drying process according to claim 2, wherein the static washing is to pump cleaning water and/or solvent to the cluster filter, and the filter cakes are washed successively and uninterruptedly in the filtering direction after the cluster filter is filled with the cleaning water and/or solvent.

4. The titanium dioxide liquid-mist washing and drying process according to claim 2, wherein the gas-liquid mixed washing is washing by mixing cleaning water and/or solvent with gas by using a scroll pump or washing by mixing compressed air with cleaning water and/or solvent.

5. The titanium dioxide liquid-mist washing and drying process according to claim 2, wherein the secondary pulping and washing is performed repeatedly for a plurality of times by introducing washing water and/or solvent into the cluster filter to wash the filter cake from the filtering direction, draining the washing water and/or solvent, purging the filter cake with gas, introducing the washing water and/or solvent into the cluster filter again to wash the filter cake from the filtering direction.

6. The titanium dioxide liquid-mist washing and drying process according to claim 2, wherein the liquid-mist and steam washing is carried out by atomizing cleaning water and/or solvent with compressed air, and washing filter cake after heating with high-temperature steam.

7. The titanium dioxide liquid mist washing and drying process according to claim 4 or 6, wherein the cleaning water and/or the solvent are sprayed into the cluster filter through a spiral atomization nozzle.

8. The titanium dioxide liquid-mist washing and drying process according to claim 6, wherein the temperature of the cleaning water and/or the solvent is raised to 80-180 ℃ by high-temperature steam.

9. The titanium dioxide liquid-mist washing and drying process according to claim 1, wherein in the sixth step, the conductivity of the washing water is not higher than 30 us/cm.

10. The titanium dioxide liquid-mist washing and drying process according to claim 1, characterized in that in the sixth step, the washing time is 12-15 min.

11. The titanium dioxide liquid-mist washing and drying process according to claim 1, wherein in the seventh step, the steam drying temperature is 100-200 ℃.

Technical Field

The invention relates to the technical field of titanium dioxide post-treatment, in particular to a titanium dioxide liquid-mist washing and drying process.

Background

In the production process of titanium dioxide, in order to improve the wettability, the dispersibility and the weather resistance of the titanium dioxide, the titanium dioxide needs to be subjected to surface coating treatment. Because soluble salts are introduced in the coating treatment, the performance of the titanium dioxide can be prevented from being influenced by the soluble salts only by washing, and the titanium dioxide is dried after washing, so that the titanium dioxide is conveniently crushed, and finer titanium dioxide particles are prepared.

At present, most manufacturers use plate-and-frame filter presses to realize filtering, drying and washing processes, the work period is long, continuous operation cannot be performed, the cycle time of each time is 2-4 hours, the process comprises central washing and frame periphery liquid inlet washing, the water consumption is large and is about 17-25 m3/T, the washing effect is poor, the water content of a filter cake is 40-50%, and the filter cake cannot be crushed into finer and more uniform titanium dioxide particles.

Aiming at the problems, manufacturers can obtain qualified titanium dioxide filter cakes by multiple times of circulating filtration, squeezing and washing through a plurality of filter presses. For example, chinese patent CN104276600B discloses a device and a method applied to washing in post-treatment section of preparing titanium dioxide by chlorination process, and specifically discloses that titanium dioxide slurry after surface treatment forms a filter cake by pressure filtration. And then, introducing the filter cake into a cleaning tank, introducing deionized water and uniformly stirring, connecting a membrane separation system behind the cleaning tank, intercepting the titanium dioxide slurry by using a membrane, washing out soluble ions, and recycling regenerated water of an ion exchange mixed bed, so that the consumption of water resources is reduced. And carrying out secondary filter pressing on the titanium dioxide slurry, and enabling the filter cake to enter a subsequent treatment process.

Although the washing water can be recycled, a plurality of plate-and-frame filter presses are still used in the filter pressing process, the filter area of each filter press is 250m2, the floor area is very large, the filter press equipment in the titanium dioxide washing process only needs a large field, the investment is huge, more equipment needs to be invested for recycling the washing water, and the defects of large water consumption and large investment in the washing and drying processes after the coating of the titanium dioxide at present cannot be fundamentally overcome.

In view of the above, there is a need to improve the titanium dioxide washing process in the prior art to solve the above problems.

Disclosure of Invention

The invention aims to disclose a titanium dioxide liquid-mist washing and drying process, which is characterized in that titanium dioxide is concentrated by a cluster filter, washing processes with different selectable modes are carried out in the cluster filter, titanium dioxide filter cakes are washed by water and/or solvents, soluble salts in the filter cakes are removed, and the filter cakes are dried by a high-temperature steam method, so that the moisture content of the filter cakes is reduced to below 30%.

In order to achieve the purpose, the invention provides a titanium dioxide liquid-mist washing and drying process, which comprises the following steps:

the method comprises the following steps: liquid-filled

Injecting the titanium dioxide slurry in the coating slurry tank into the cluster filter through a centrifugal pump;

step two: prefiltering

The titanium dioxide slurry is pre-filtered by the cluster filter, the slurry containing fine particles is discharged into the flat ceramic membrane filter from the cluster filter, and the slurry containing large particles is intercepted outside a filter element of the cluster filter;

step three: filtration

Filtering slurry containing fine particles by using a flat ceramic membrane filter, discharging the generated clear liquid into a clear liquid tank, returning the concentrated liquid into the cluster filter for secondary filtration, and filtering for a period of time to form a filter cake layer on the surface of a filter element of the cluster filter to form deep filtration which can intercept finer particles;

step four: discharging residual liquid

When the pressure difference of the inlet and the outlet of the cluster filter reaches a set value, stopping filtering, introducing compressed air from an overflow port of the cluster filter for positive pressure discharge, and returning the unfiltered titanium white slurry to the coating slurry tank by the compressed air, wherein the compressed air flows through the surface of the filter element, so that the liquid in the filter cake on the surface of the filter element can be fully replaced;

step six: washing machine

After the filtration is finished, discharging the concentrated solution in the cluster filter, and sending cleaning water and/or solvent to the cluster filter to wash filter cakes on the surface of the filter element;

step seven: steam drying

After washing is finished, purging and drying the filter cake on the surface of the filter element through high-temperature steam, draining the water in the filter cake, and circularly washing in the step six for multiple times until the conductivity of the washing water is 100us/cm after washing;

step eight: back-blowing cake

And after the steam drying is finished, the pressure of the cluster filter is removed, gas is injected into a filtrate outlet of the cluster filter, the filter element is subjected to back flushing, and a filter cake after vibration crushing is discharged.

In some embodiments, the washing in the sixth step is static washing or gas-liquid mixed washing or secondary beating washing or liquid-mist + steam washing.

In some embodiments, the static washing is pumping wash water and/or solvent to the cluster filter, and washing the filter cake continuously in sequence from the direction of filtration after filling the cluster filter.

In some embodiments, the gas-liquid mixed washing is washing by mixing cleaning water and/or solvent with gas using a scroll pump or washing by mixing cleaning water and/or solvent with compressed air.

In some embodiments, the second beating washing is performed by introducing washing water and/or solvent into the cluster filter to wash the filter cake from the filtering direction, draining the washing water and/or solvent, purging the filter cake with gas, and introducing the washing water and/or solvent into the cluster filter again to wash the filter cake from the filtering direction, wherein the second beating washing is performed repeatedly.

In some embodiments, the liquid mist + steam washing is to atomize the cleaning water and/or solvent with compressed air and wash the filter cake after the temperature rise with high temperature steam.

In some embodiments, the wash water and/or solvent is sprayed into the bundled filter through a spiral atomizer.

In some embodiments, the temperature of the cleaning water and/or solvent is raised to 80-180 ℃ by high-temperature steam.

In some embodiments, in step six, the conductivity of the wash water is no greater than 30 us/cm.

In some embodiments, in the sixth step, the washing time is 12-15 min.

In some embodiments, in the seventh step, the steam drying temperature is 100 to 200 ℃.

Compared with the prior art, the invention has the beneficial effects that: (1) the processing flow of the titanium dioxide coating slurry is short, only washing and drying are needed to be carried out in a cluster filter, closed processing is carried out, and manual participation is not needed; (2) four different washing processes can be selected, the dissolubility of soluble salt in the slurry is improved by adopting washing water and/or a solvent, and the qualified conductivity can be achieved only by washing for a plurality of times; (3) because the high-temperature atomization washing is adopted, compared with the traditional filter press, a large amount of water resources are saved, and the washing and drying efficiency is improved.

Drawings

FIG. 1 is a schematic view of a titanium dioxide liquid-mist washing and drying process shown in the invention.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

Example 1

As shown in figure 1, the titanium dioxide liquid-mist washing and drying process comprises the following steps:

the method comprises the following steps: filling liquid, and injecting the titanium dioxide slurry in the coating slurry tank into the cluster filter through a centrifugal pump.

Step two: and pre-filtering, wherein the titanium dioxide slurry is pre-filtered by a cluster filter, the slurry containing fine particles is discharged into the flat ceramic membrane filter from the cluster filter, and the slurry containing large particles is intercepted outside a filter element of the cluster filter.

Step three: filtering, wherein the flat ceramic membrane filter filters slurry containing fine particles, the generated clear liquid is discharged into a clear liquid tank, the concentrated solution is returned to the cluster filter for secondary filtration, and a filter cake layer is formed on the surface of a filter element of the cluster filter after a period of filtration to form deep filtration, so that finer particles can be intercepted.

Step four: and (3) discharging residual liquid, stopping filtering when the pressure difference between the inlet and the outlet of the cluster filter reaches a set value, introducing compressed air from an overflow port of the cluster filter for positive pressure discharge, returning the unfiltered titanium dioxide slurry into the coating slurry tank by the compressed air, and flowing the compressed air on the surface of the filter element to fully replace the liquid in the filter cake on the surface of the filter element.

Step six: and (3) after washing and filtering, discharging the concentrated solution in the cluster filter, and conveying cleaning water and/or solvent into the cluster filter to wash filter cakes on the surface of the filter element. This example prefers a static scrubbing process.

The static washing is to pump cleaning water and/or solvent to the cluster filter, and then the filter cake is washed continuously in sequence from the filtering direction after the cluster filter is filled with the cleaning water and/or solvent.

Wherein the conductivity of the cleaning water is not higher than 30us/cm, and the washing time is 12-15 min each time.

Step seven: and (5) steam drying, after washing is finished, purging and drying the filter cake on the surface of the filter element through high-temperature steam, draining the water in the filter cake, and circulating the step six and the step seven for multiple times until the conductivity of the washing water is 100us/cm after washing.

Wherein the steam drying temperature is 100-200 ℃.

Step eight: and (3) blowing back to remove the cake, after the steam drying is finished, removing the pressure of the cluster filter, injecting gas into a filtrate outlet of the cluster filter, blowing back the filter element, and discharging the filter cake after vibration crushing.

The filter cake after shattering is discharged onto a conveying mechanism through a slag discharge valve at the bottom of the cluster filter, and the dried filter cake is conveyed to the next treatment section for post-treatment, wherein the moisture content of the filter cake after being dried by the embodiment can reach 25%.

In this embodiment, besides the flat ceramic membrane filter, an ultrafiltration membrane system, a reverse osmosis system, or a nanofiltration membrane system, such as a dynamic ceramic membrane filter or an organic membrane filtration system, which is matched with the interface pipeline of the cluster filter, may also be used.

Example 2

As shown in figure 1, the titanium dioxide liquid-mist washing and drying process comprises the following steps:

the method comprises the following steps: filling liquid, and injecting the titanium dioxide slurry in the coating slurry tank into the cluster filter through a centrifugal pump.

Step two: and pre-filtering, wherein the titanium dioxide slurry is pre-filtered by a cluster filter, the slurry containing fine particles is discharged into the flat ceramic membrane filter from the cluster filter, and the slurry containing large particles is intercepted outside a filter element of the cluster filter.

Step three: filtering, wherein the flat ceramic membrane filter filters slurry containing fine particles, the generated clear liquid is discharged into a clear liquid tank, the concentrated solution is returned to the cluster filter for secondary filtration, and a filter cake layer is formed on the surface of a filter element of the cluster filter after a period of filtration to form deep filtration, so that finer particles can be intercepted.

Step four: and (3) discharging residual liquid, stopping filtering when the pressure difference between the inlet and the outlet of the cluster filter reaches a set value, introducing compressed air from an overflow port of the cluster filter for positive pressure discharge, returning the unfiltered titanium dioxide slurry into the coating slurry tank by the compressed air, and flowing the compressed air on the surface of the filter element to fully replace the liquid in the filter cake on the surface of the filter element.

Step six: and (3) after washing and filtering, discharging the concentrated solution in the cluster filter, and conveying cleaning water and/or solvent into the cluster filter to wash filter cakes on the surface of the filter element. The gas-liquid mixed washing process is preferred in this embodiment.

The gas-liquid mixed washing is washing by mixing cleaning water and/or solvent with gas by using a scroll pump or washing by mixing compressed air with cleaning water and/or solvent.

Wherein, the cleaning water and/or the solvent are sprayed into the cluster filter through the spiral atomizing nozzle. The conductivity of the cleaning water is not higher than 30us/cm, and the washing time is 12-15 min each time.

The gas after washing is subjected to gas-liquid separation through a gas-fog separator connected with the top of the cluster filter, the gas can be returned for use, and the liquid can flow into a condensed water tank for later use.

Step seven: and (4) steam drying, after washing is finished, purging and drying the filter cake on the surface of the filter element through high-temperature steam, draining the water in the filter cake, and repeatedly washing in the step six until the conductivity of the washed water is 100 us/cm.

Wherein the steam drying temperature is 100-200 ℃.

Step eight: and (3) blowing back to remove the cake, after the steam drying is finished, removing the pressure of the cluster filter, injecting gas into a filtrate outlet of the cluster filter, blowing back the filter element, and discharging the filter cake after vibration crushing.

The filter cake after shattering is discharged onto a conveying mechanism through a slag discharge valve at the bottom of the cluster filter, and the dried filter cake is conveyed to the next treatment section for post-treatment, wherein the moisture content of the filter cake after being dried by the embodiment can reach 15%.

In this embodiment, besides the flat ceramic membrane filter, an ultrafiltration membrane system, a reverse osmosis system, or a nanofiltration membrane system, such as a dynamic ceramic membrane filter or an organic membrane filtration system, which is matched with the interface pipeline of the cluster filter, may also be used.

Example 3

As shown in figure 1, the titanium dioxide liquid-mist washing and drying process comprises the following steps:

the method comprises the following steps: filling liquid, and injecting the titanium dioxide slurry in the coating slurry tank into the cluster filter through a centrifugal pump.

Step two: and pre-filtering, wherein the titanium dioxide slurry is pre-filtered by a cluster filter, the slurry containing fine particles is discharged into the flat ceramic membrane filter from the cluster filter, and the slurry containing large particles is intercepted outside a filter element of the cluster filter.

Step three: filtering, wherein the flat ceramic membrane filter filters slurry containing fine particles, the generated clear liquid is discharged into a clear liquid tank, the concentrated solution is returned to the cluster filter for secondary filtration, and a filter cake layer is formed on the surface of a filter element of the cluster filter after a period of filtration to form deep filtration, so that finer particles can be intercepted.

Step four: and (3) discharging residual liquid, stopping filtering when the pressure difference between the inlet and the outlet of the cluster filter reaches a set value, introducing compressed air from an overflow port of the cluster filter for positive pressure discharge, returning the unfiltered titanium dioxide slurry into the coating slurry tank by the compressed air, and flowing the compressed air on the surface of the filter element to fully replace the liquid in the filter cake on the surface of the filter element.

Step six: and (3) after washing and filtering, discharging the concentrated solution in the cluster filter, and conveying cleaning water and/or solvent into the cluster filter to wash filter cakes on the surface of the filter element. The second beating washing process is preferred in this embodiment.

And the secondary pulping and washing is to introduce cleaning water and/or solvent into the cluster filter to wash the filter cake from the filtering direction, then to drain the cleaning water and/or solvent, to introduce the cleaning water and/or solvent into the cluster filter again after the filter cake is purged by gas to wash the filter cake from the filtering direction, and to repeatedly carry out the processes.

Wherein the conductivity of the cleaning water is not higher than 30us/cm, and the washing time is 12-15 min.

Step seven: and (4) steam drying, after washing is finished, purging and drying the filter cake on the surface of the filter element through high-temperature steam, draining the water in the filter cake, and repeatedly circulating the washing in the step six until the conductivity of the washing water and/or the solvent is 100us/cm after washing.

Wherein the steam drying temperature is 100-200 ℃.

Step eight: and (3) blowing back to remove the cake, after the steam drying is finished, removing the pressure of the cluster filter, injecting gas into a filtrate outlet of the cluster filter, blowing back the filter element, and discharging the filter cake after vibration crushing.

The filter cake after shattering is discharged onto a conveying mechanism through a slag discharge valve at the bottom of the cluster filter, and the dried filter cake is conveyed to the next treatment section for post-treatment, wherein the moisture content of the filter cake after being dried by the embodiment can reach 20%.

In this embodiment, besides the flat ceramic membrane filter, an ultrafiltration membrane system, a reverse osmosis system, or a nanofiltration membrane system, such as a dynamic ceramic membrane filter or an organic membrane filtration system, which is matched with the interface pipeline of the cluster filter, may also be used.

Example 4

As shown in figure 1, the titanium dioxide liquid-mist washing and drying process comprises the following steps:

the method comprises the following steps: filling liquid, and injecting the titanium dioxide slurry in the coating slurry tank into the cluster filter through a centrifugal pump.

Step two: and pre-filtering, wherein the titanium dioxide slurry is pre-filtered by a cluster filter, the slurry containing fine particles is discharged into the flat ceramic membrane filter from the cluster filter, and the slurry containing large particles is intercepted outside a filter element of the cluster filter.

Step three: filtering, wherein the flat ceramic membrane filter filters slurry containing fine particles, the generated clear liquid is discharged into a clear liquid tank, the concentrated solution is returned to the cluster filter for secondary filtration, and a filter cake layer is formed on the surface of a filter element of the cluster filter after a period of filtration to form deep filtration, so that finer particles can be intercepted.

Step four: and (3) discharging residual liquid, stopping filtering when the pressure difference between the inlet and the outlet of the cluster filter reaches a set value, introducing compressed air from an overflow port of the cluster filter for positive pressure discharge, returning the unfiltered titanium dioxide slurry into the coating slurry tank by the compressed air, and flowing the compressed air on the surface of the filter element to fully replace the liquid in the filter cake on the surface of the filter element.

Step six: and (3) after washing and filtering, discharging the concentrated solution in the cluster filter, and conveying cleaning water and/or solvent into the cluster filter to wash filter cakes on the surface of the filter element. The liquid mist + steam wash process is preferred in this embodiment.

The liquid fog and steam washing is to atomize cleaning water and/or solvent by using compressed air, and wash filter cakes after the temperature of high-temperature steam is raised. Cleaning water and/or solvent are sprayed into the cluster filter through the spiral atomizing nozzle.

And heating the cleaning water and/or the solvent to 80-180 ℃ through high-temperature steam, and then performing washing, wherein the conductivity of the cleaning water is not higher than 30us/cm, and the washing time is 12-15 min.

The gas after washing is subjected to gas-liquid separation through a gas-fog separator connected with the top of the cluster filter, the gas can be returned for use, and the liquid can flow into a condensed water tank for later use.

Step seven: and (4) steam drying, after washing is finished, purging and drying the filter cake on the surface of the filter element through high-temperature steam, draining the water in the filter cake, and repeatedly circulating the washing in the step six until the conductivity of the washing water and/or the solvent is 100us/cm after washing.

Wherein the steam drying temperature is 100-200 ℃.

Step eight: and (3) blowing back to remove the cake, after the steam drying is finished, removing the pressure of the cluster filter, injecting gas into a filtrate outlet of the cluster filter, blowing back the filter element, and discharging the filter cake after vibration crushing.

The filter cake after shattering is discharged onto a conveying mechanism through a slag discharge valve at the bottom of the cluster filter, and the dried filter cake is conveyed to the next treatment section for post-treatment, wherein the moisture content of the filter cake after being dried by the embodiment can reach 10%.

In this embodiment, besides the flat ceramic membrane filter, an ultrafiltration membrane system, a reverse osmosis system, or a nanofiltration membrane system, such as a dynamic ceramic membrane filter or an organic membrane filtration system, which is matched with the interface pipeline of the cluster filter, may also be used.

TABLE 1 comparison of the data of the examples with those of the conventional washing experiment

In embodiments 1 to 4, the flat ceramic membrane filter is connected to an aeration fan, which can introduce gas into the flat ceramic membrane filter at regular time and quantity, blow off the filter cake on the filter element of the flat ceramic membrane filter, remove the filter cake, and improve the filtration efficiency.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.