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What to do if the fine sand recycling machine produces unclean sand? How to improve recycling rate?

Release time:Apr.06.2024 Views:0

In the later stage of the sand making production line, (Stone crusher)for sand with a large mud content or a sand-water mixture with a large sand content, only a sand washing machine may not meet the requirements for the final finished sand, so a fine sand recovery machine is required. , it has become the standard equipment in the sand making production line, and its importance is self-evident. When the equipment is used for a long time, some problems will inevitably occur, such as: the sand is not clean. In order to solve the problem of unclean sand produced by the fine sand recovery machine, we must first find out the cause of the problem before we can prescribe the right medicine to solve the problem. Xingao Nai Heavy Industry has summarized the following 5 reasons.

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Reasons and solutions for unclean sand production

1. The discharge port is blocked

If the sand and gravel particles in the slurry in the fine sand recovery machine are too fine, and the single feeding amount suddenly increases, causing material to accumulate at the discharge port, the sand discharge will be unclean.

Solution: Stop feeding immediately, open all discharge openings, rinse with clean water before continuing the operation. When starting the operation again, be sure to feed the material evenly.

2. The pressure of the cyclone is too large

During operation, if the pressure given by the cyclone is too high, it will cause water to spray and splash from the cyclone. Eventually, the sediment cannot be completely separated when the material passes through the vibrating screen. If the pressure is too small, the fine sand cannot be completely separated. Recycling, resulting in low fine sand recovery rate.

Solution: Properly configure the cyclone and provide appropriate pressure.

3. The vacuum high-pressure pump is clogged

If debris enters the mud, causing the vacuum high-pressure pump to become clogged, it will result in unclean sand production.

Solution: During operation, try to prevent debris from entering the mud. You can directly connect the outlet of the dewatering screen to the feed port of the fine sand recovery machine to prevent debris from entering and clogging the high-pressure pump.

4. Sieve plate

When the screen mesh of the screen plate is too large and the particle size of the recovered fine sand is small, there will definitely be no sand. If the mesh size is too small and the particle size of the sand is too large, it will easily cause the dewatering fine sand recovery machine to become clogged. This will also cause it to not produce sand.

Solution: Choose the appropriate screen according to the fine sand particle size in the production line.

5. Vibration motor

If the motor power is too small, the motor will not be able to drive the equipment, resulting in no sand production. If the motor power is too large, electricity will be wasted, making the investment uneconomical.

Solution: Choose the appropriate vibration motor according to your actual situation.

How to improve recycling rate

Another problem often encountered in sand washing operations is the serious loss of fine sand (up to more than 20% in severe cases), which will not only cause losses to the company but also affect the sand grading. The fine sand recovery machine can, according to the characteristics of the sand and gravel, Reasonably decompose the sand-water mixture, realize the recycling of fine sand particles in the mixture to a large extent, effectively solve the problems of serious loss of fine sand and high fineness modulus of finished sand in the traditional process, and reduce the stone powder content in the tail water , while improving the economic benefits of users, it also reduces the processing costs of tailings and the pollution and damage to the environment caused by the loss of fine sand.

Fine sand recovery machines are usually used in conjunction with sand washing machines. Improving the recovery rate is a matter of great concern to many users. If you want to increase the recovery rate, you must first understand the factors that affect the recovery rate. Through the analysis of the influencing factors, you can then improve the recovery rate. The recovery rate method increases users’ economic benefits. Generally, there are the following 8 factors that will affect the recovery rate.

1. Degree of material crushing

Before the material enters the fine sand recovery machine, the operator must check the degree of crushing of the material. If the feed particle size of the fine sand recovery machine changes during production, it will be immediately reflected in the recovery process, affecting the recovery rate. .

Therefore, within the allowable range, the finer the crushing particle size, the better.

2. Material properties

The composition and physical properties of the material have a great influence on the recovery rate of fine sand. For example, when the particle size of the material is coarse, the structure is loose and brittle, it is easier to grind, and when the mineral embedded particle size becomes fine, the structure is fine, and the hardness is high, it is more difficult to recover. Because the fine sand recovery machine is suitable for processing ores with Mohs hardness below 9, although ores with higher hardness can also be recovered, they will accelerate the wear of the fine sand recovery machine parts, thereby affecting its recovery efficiency.

Therefore, the production line needs should be strictly followed, the appropriate machine model should be configured, and the appropriate material hardness should be ensured.

3. The screen is damaged or the bolts are loose

During operation, if it is found that the amount of fine sand recovered is significantly reduced or there is a lot of sand leakage, it is necessary to check whether the screen is broken or the bolts fixing the screen are loose. When the screen wear is too severe, it is necessary to Network disconnection will occur, resulting in a reduction in the efficiency of recovering fine sand.

Therefore, operators should regularly check the wear of the screen and the tightness of the bolts. If serious wear or looseness is found, replace and tighten it in time to avoid the loss of fine sand.

4. Processing volume matching problem

If the amount of wastewater discharged by the sand and gravel plant every day is greater than the processing capacity of the fine sand recovery machine, the recovery efficiency will definitely be insufficient.


Therefore, when purchasing, users should pay attention to whether the power of the fine sand recovery machine matches the processing capacity of their own sand and gravel plant.

5. Density of sand-water mixture

The fine sand recovery machine recovers the fine sand in the sand-water mixture. If the density of the sand-water mixture is too high or too small, the efficiency of the fine sand recovery machine cannot be maximized.


Therefore, appropriate density should be ensured to ensure a maximum recovery rate.

6. Separator blade wear

After the blades are worn, the amount of sand returned will be reduced and the sand fineness will become coarser. If the blades are severely worn, it will also affect the life of the separator.


Therefore, after the fine sand recovery machine has been working for a period of time, the wear condition of the separator blades should be checked in time, and the worn blades should be replaced in time to ensure that they are in good condition during operation. When the operation reaches 20 hours, the machine should be stopped and rested for a period of time before continuing the operation to avoid overload work and effectively increase the recovery rate.

7. Equipment elements

Equipment factors have a certain impact on the recovery rate of fine sand, so when purchasing a machine, you should choose a professional and regular manufacturer.

8. Operating standards

Whether the operation is standardized will also affect the recovery rate of fine sand. For example: in closed-circuit grinding, when the sand return ratio is too large and exceeds the normal processing capacity of the fine sand recovery machine, "coarse" phenomenon will occur; while the sand return ratio is too small, or there is no sand return, it is easy to Caused excessive damage. If the load is too large, the "rough running" phenomenon will be serious; if the load is insufficient, the overload damage will be serious.

Therefore, the operation method of the fine sand recovery machine must be standardized. The ore feeding amount must not be increased or decreased occasionally. The ore feeding must be uniform, continuous and stable to ensure a high recovery rate of the fine sand recovery machine.