Reasons for non absorption of ceramic filter

1. It may be the fault of filtrate pump, the diaphragm of the pump is damaged, the mechanical seal of the pump is invalid, one is leakage, the other is no liquid output or weak output, the pressure is too low, the cleaning effect is not good, the pressure is too high, the filter plate will be damaged and the slurry concentration will be reced. The recoil water pressure is regulated by pump circuit valve and pressure regulating valve. In order to avoid too frequent pressure fluctuation and pressure fluctuation in a short time, there is a buffer cylinder in the backwash water pipeline to stabilize the pressure.

2.

In general, the vacuum degree of ceramic filter is about -0.08mpa, which is enough. Sufficient vacuum pressure is only the premise of good slurry absorption effect of ceramic plate. In addition to the influence of vacuum on slurry absorption effect, there are other factors that may affect it:

1. the vacuum display meter fails, and the displayed value is quite different from the actual data

2. ceramic filter plate

   if the ceramic filter plate is blocked or the type selection is inconsistent, the porosity of the new plate is generally about 40%. If the ceramic filter plate has been blocked, the opening rate will become less. When it becomes 30%, the slurry absorption effect may be slightly worse than that of the new plate. When the ceramic filter plate is used for a long time, the opening rate may become 10% or even less. At this time, the slurry absorption effect of the ceramic filter plate will become very poor or even no slurry absorption. At this time, even if the vacuum suction is no longer good, it is necessary to replace the new ceramic filter plate

   how to find the most suitable ceramic filter plate for their own pulp, it is best to try more

3. e to the high mud content and fine particle size of the incoming material, the slurry itself is not suitable for dewatering by ceramic filter. If the ceramic filter is used for dewatering in this case, the blocking of ceramic filter plate will be accelerated. Refer to the description in article 2 for the situation after blocking

4. the filtrate is not discharged smoothly

   if the filtrate can't be discharged smoothly and timely, the new filtrate can't be sucked out. If the filtrate can't be sucked out continuously, no filter cake will be adsorbed on the ceramic plate

5. the spindle speed is too fast

   The rotating speed is too fast to absorb the cake
   There are other possible reasons

3.

Generally speaking, the main reason why the thickness of ceramic filter cake is different is that the old and new degree of ceramic filter plate is different. Because the vacuum suction of ceramic filter, backwash water, nitric acid, etc. are all through the distribution valve, it is often "all win and all lose". When I see your description, I don't know whether the five lines you mentioned mean five discs or five rows of ceramic plates. At that time, there was no pulp suction at all or the effect of pulp suction was poor. I hope my answer is helpful to you:

1. analysis of five discs without pulp suction

   large ceramic filters generally have vacuum tanks at both ends, If 50 M2 ceramic filter is combined with 5 m2 / circle ceramic filter plate (possible), there are 10 discs. The left vacuum tank is responsible for filtering the ceramic plates of the left 5 discs, and the right vacuum tank is responsible for filtering the ceramic plates of the right 5 discs. If the vacuum system of a transformer breaks down temporarily, it may lead to poor slurry suction effect on one side or even no slurry suction and normal operation on the other side

2. there are five rows of ceramic plates across the ceramic filter without slurry absorption

   
   

   the figure above is the schematic diagram of the distribution valve. Coincidentally, the distribution friction ring (right figure) of the distribution valve of the ceramic filter just has a section (the small long section on the right figure) which is the same length as the five continuous small holes of the friction ring, The small and long section is just the stage of filter cake formation in the working process of ceramic filter plate in pulp. If there is a fault in this stage (such as temporary fault in connecting pipeline, distribution system or ceramic filter plate), the filter cake can not be formed at this stage. After turning up, there will be five rows of ceramic plates that do not suck pulp. The specific temporary fault can be determined by oneself

3. in addition, after the normal start-up, the local ceramic filter plate does not absorb slurry or the effect is poor. On the one hand, it is the problem of ceramic filter, on the other hand, it is the problem of ore feeding

   the main problems of ceramic filter are ceramic filter plate and vacuum system. The main problems of ceramic filter plate are the different old and new degree of ceramic plate and the different pore sizes of procts from different manufacturers; The vacuum components and pipes can be checked step by step for vacuum system problems

   The distribution of ore concentration, fineness and pulp concentration in the tank are different

   ceramic filter has multiple systems, so it is easy to have such and such unknown problems. Fortunately, it is good again

4. when the user increases the feeding capacity and wants to improve the processing capacity of ceramic filter, the unknown influencing factors are most likely to appear: for example, after the concentration is increased, the slurry is easy to precipitate and is not easy to stir up, which will accelerate the abrasion, even deformation and fracture of mixing palladium, and even cause the whole worktable to vibrate or even not stir

   above is where I want to go. This is a brick thrown out, hoping to bring back a piece of jade! Focus on many years, welcome more questions ceramic filter

4.

Ceramic filter is a new and efficient dewatering equipment. If the user finds that the surface of ceramic filter plate sucks pulp poorly or even does not suck pulp, he should check the reasons in time to avoid affecting the proction efficiency. I hope the following analysis and answer will be helpful to you:

I. The reason of ceramic filter itself

the ceramic filter is dehydrated and dried by vacuum suction acting on the ceramic filter plate. The ceramic filter plate needs to be cleaned and has a long service life. If users find that the slurry absorption effect is poor or even not, they should first consider these three aspects:

1. ceramic filter plate

   ceramic filter plate is the most likely two factors, They are rupture and hole plugging: rupture will lead to vacuum distortion and poor cleaning; If it is suspected that the ceramic filter plate is blocked, the cleaning can be strengthened moderately (such as shortening the cleaning cycle, prolonging the cleaning time, increasing the amount of nitric acid, etc.). If the effect is still not improved after strengthening the cleaning, it is necessary to strengthen the cleaning, It should be considered that its service life is approaching, and it should be scrapped in time and replaced with a new ceramic filter plate (when replacing the new plate, it is better to replace the old and new plates or plates from different manufacturers on the same line)

2. vacuum system failure

   the vacuum degree of ceramic filter is generally about -0.085mpa. If the vacuum is abnormal, it can not provide normal vacuum suction, and the slurry suction effect is poor or even not

   in case of abnormal vacuum, we should insist on whether the vacuum pump is faulty, whether the vacuum connecting pipe is leaking, how the friction plate sealing performance of the distribution valve is, whether the rubber pipe connecting the outlet of the ceramic filter plate is aging or falling off, whether the ceramic filter plate is broken, etc

3. cleaning

   the cleaning of ceramic filter is divided into two parts: backwash water cleaning (also useful gas) and combined cleaning. The purpose of cleaning is to discharge the blocked particles out of the ceramic filter plate

   the backwash water can be cleaned directly by visual inspection of the water pressure after filtering of the water filter, which is generally between 0.08-0.12mpa. If it is lower than 0.05Mpa, the flushing effect is poor or even has no flushing effect, resulting in the accumulation of blockage and eventually the scrapping of the ceramic filter plate. The stable backwashing water pressure can be provided by changing the filter element in time and ensuring the pre filtration water pressure

   combined cleaning is to use ultrasonic vibration, nitric acid dissolution and other methods to remove the blockage that can not be removed by backwashing to the maximum extent. Generally, ceramic filtration should be shut down for cleaning for 1 hour every 8 hours of continuous operation. If the old plate is used or the slurry absorption effect is poor, the cleaning can be moderately strengthened (such as shortening the cleaning cycle, extending the cleaning time, increasing the amount of nitric acid, etc.)

4. other reasons

   such as 1,2,3 are normal, but the filtrate can not be discharged normally, the spindle speed is too fast, even the ceramic filter itself manufacturing defects, the user's own modification of the equipment, etc., may lead to abnormal operation of the equipment

   we focus on ceramic filter board for many years, welcome more exchanges

   Second, external reasons

   the change of ore feeding conditions, such as the slime size becoming smaller, the mud content increasing, the concentration becoming thinner, and even improper operation, may lead to the change of ore feeding conditions. If the user finds that the fault cannot be solved by himself, he should contact the manufacturer in time for help

5. Also depends on the configuration, different materials and configuration, poor ceramic filter through the ceramic plate on the ceramic microporous suction adsorption concentrate filter water, the parameters set according to one, the fineness of the material, resulting in the loss of water

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7. 1. All the parameters you mentioned are stable. What is the vacuum? Do the parameters meet the requirements
2. The ceramic filter plate is blocked (the ceramic plate has been used for a long time, and the cleaning effect is poor e to the failure of backwashing, pickling and ultrasonic)
3. Whether the ore feeding conditions change (such as the change of concentration, particle size and mud content)
4. Whether the liquid discharge is normal
5. The most likely reason is that it's not mine, so it doesn't suck pulp or the effect is poor!

8. Working principle: it is based on the principle of capillary micropore, through which the solid-liquid separation can be realized. Specifically, it is to use the water and air tight characteristics of the microporous ceramic plate to extract the vacuum in the inner cavity of the ceramic plate to generate the pressure difference with the outside, so that the suspended materials in the material tank are adsorbed on the ceramic plate under the action of negative pressure, and the solid materials are intercepted on the surface of the ceramic plate because they cannot pass through the microporous ceramic plate, Because of the vacuum pressure difference and the hydrophilicity of the ceramic plate, the liquid enters the gas-liquid distribution device and then is discharged or recycled to achieve the purpose of solid-liquid separation
the common faults and reasons of ceramic filter are as follows:
low vacuum degree: the reasons are vacuum pipeline leakage, insufficient circulating water of vacuum pump, abrasion of vacuum pump impeller, abrasion of distribution head, breakage of ceramic plate, untightened drainage valve of filtrate tank and low slurry level of slurry tank
low or fluctuating pressure of backwash water: the reasons are blockage or leakage of backwash water pipeline system and abrasion of distribution head
the cleaning of ceramic plate ring ultrasonic cleaning is not clean: the reasons are power box failure, power fuse burn out, circuit aging, transcer burn out, ultrasonic box breakdown and low water level of slurry tank
the acid pump does not work normally and the backwash water flows back to the acid tank: the reasons are that the acid pump switch is not opened, the diaphragm is worn, the frequency is too low, and the check valve connecting the acid pipe and the backwash water pipe is worn.

9. The shape and mechanism of ceramic filter are similar to those of disc vacuum filter, but the filtering media of them are different. The filter medium of ceramic filter is ceramic filter plate, on which there are micropores that can proce capillary effect. Generally, the capillary force in micropores is greater than the force exerted by vacuum, so that the micropores are always full of liquid. Therefore, no matter what circumstances, air will not pass through the ceramic filter plate, so that the energy consumption of solid-liquid separation of ceramic filter is low, And the vacuum degree is high
1. Working principle
is based on the principle of capillary action, through which the solid-liquid separation can be realized. Specifically, it is to use the water and air tight characteristics of the microporous ceramic plate to extract the vacuum in the inner cavity of the ceramic plate to generate the pressure difference with the outside, so that the suspended materials in the material tank are adsorbed on the ceramic plate under the action of negative pressure, and the solid materials are intercepted on the surface of the ceramic plate because they cannot pass through the microporous ceramic plate, Because of the vacuum pressure difference and the hydrophilicity of the ceramic plate, the liquid enters the gas-liquid distribution device and then is discharged or recycled to achieve the purpose of solid-liquid separation< Composition
the ceramic filter is mainly composed of roller system, mixing system, feeding and discharging system, vacuum system, filtrate discharge system, scraping system, hair washing system, combined cleaning system, automatic control system, tank and rack
3. Common faults
the common faults and reasons of ceramic filter are as follows:
low vacuum degree: the reasons include vacuum pipeline leakage, insufficient circulating water of vacuum pump, abrasion of vacuum pump impeller, abrasion of distribution head, breakage of ceramic plate, untightened drainage valve of filtrate tank and low material level of pulp tank
low or fluctuating pressure of backwash water: the reasons are blockage or leakage of backwash water pipeline system and abrasion of distribution head
the cleaning of ceramic plate ring ultrasonic cleaning is not clean: the reasons are power box failure, power fuse burn out, circuit aging, transcer burn out, ultrasonic box breakdown and low water level of slurry tank
the acid pump does not work normally and the backwash water flows back to the acid tank: the reasons are that the acid pump switch is not opened, the diaphragm is worn, the frequency is too low, and the check valve connecting the acid pipe and the backwash water pipe is worn.

10. I don't know if "thin material" means that the concentration of slurry in the tank of ceramic filter is thin, or the slurry absorption cake of ceramic filter plate is thin and the water content is high? If it means that the slurry concentration in the tank of the ceramic filter is thin, it has nothing to do with the ceramic filter itself. We can find a way to increase the slurry concentration before entering the tank of the ceramic filter, so as to improve the dehydration efficiency of the ceramic filter. If what you mean by "thin material" is that when the ceramic filter sucks slurry, the ceramic filter plate has thin cake and high water content, then it is the reason of the ceramic filter itself. You can check and consider from the following aspects: is this always the case or has it just happened recently? If it has always been the case, it may be because the slurry selected by your department is not suitable for the ceramic filter (such as large mud content, fine particle size, high water content) The selection of ceramic filter plate is not in accordance with the requirements, etc.) or the ceramic filter is not qualified. If there is such abnormality in the near future, it may be that the feeding conditions have changed, the operating parameters of the ceramic filter or the cleaning is not up to the standard. It can check whether the vacuum system (the general range of vacuum degree is - 0.09 ～ - 0.075mpa), backwashing system (generally refers to the backwashing water pressure after filtration is 0.07 ～ 0.12mpa), pickling system (the amount of nitric acid needs to reach the standard) and ultrasonic system are normal. Vacuum failure may be vacuum pump failure, vacuum pipeline leakage, ceramic filter plate rupture or connection leakage, backwashing system is generally insufficient water pressure before filtration, filter element blockage, etc. Insufficient vacuum will lead to poor pulp suction effect or even no pulp suction; If the cleaning is not up to the standard, the clogging of ceramic filter plate will be accelerated. Even if the vacuum of the clogged ceramic filter plate is normal, the slurry absorption effect will be poor or even not, such as thin cake and high water content. The ceramic filter plate was scrapped. The ceramic filter plate has a service life of about one year under normal circumstances. If the pulp contains a lot of mud, fine particle size or contains easily precipitated components, and the cleaning is not up to standard, its service life will be reced. When the ceramic filter plate is close to scrapping, its slurry absorption effect will also become worse. I hope my answer can help you.