Characteristic analysis and purification path selection of lotion
1. As the most important cooling and lubricating medium for metal cutting, cutting fluid belongs to the category of emulsions, whether it is emulsion or microemulsion, which is a stable water in oil system; During use, the cutting fluid is contaminated by metal particles and rail oil, resulting in deterioration and damage;
2. Due to the high viscosity of the cutting fluid, it is difficult for micron sized particles, oil droplets and mold to settle in the high viscosity lotion; Traditional skimming modules and paper tape filtration modules are simply unable to remove micrometer sized particles and oil droplets; Using a high-speed disc separator to generate a strong centrifugal position, increasing the settling speed of particles and oil droplets becomes the only option;
3. In a centrifugal position greater than 5000G, micrometer sized particles and oil droplets achieve a high settling speed. During the medium circulation process, particles (including mold) settle to the largest diameter of the drum body, and the oil droplets automatically exit the drum body through a maze. The emulsification performance and concentration of the medium remain unchanged.

Separation process:
1. Dirty cutting fluid entering;
2. Enter the rotating drum body and separate in the disc bundle;
3. The purified and separated cutting fluid and heavy particles flow out of the disc bundle;
4. The purified liquid flows out after being pressurized by a centrifugal pump;
5. The clean liquid flows through the discharge pipeline;
6. Waste oil can freely flow out of the drum as a light item;
7. Particles settle as heavy items in the drum and must be manually discharged after parking.

Criteria and methods for judging qualified lotion purification:
1. If the concentration remains unchanged, it means that the lotion has not been demulsified after centrifugal separation, and the refractometer is used for confirmation;
2. A pH value increase of 0.5 indicates that after removing acidic substances such as metal oxides, floating oil, and mold, the alkaline value of the cutting fluid increases (this is particularly important as it involves the rust prevention performance of the cutting fluid, which can be confirmed using a pH test paper);
3. Micron level oil droplets and particles, in a transparent container (100-200mm depth), do not layer visually after 24 hours, and can also be tested for layering using a high-speed centrifuge in a test tube;
4. The mold content decreases by an exponential level, and the mold test rod can be used to determine it in the observation window.

Attention tip:
1. Fungi are particles that are heavier than water and can effectively settle into the drum during centrifugation. Therefore, centrifuges can effectively remove fungi without the need for additional ozone sterilization modules;
2. Ozone sterilization is not suitable for cutting fluids. Cutting fluids contain a large amount of effective COD, and probiotic organic compounds will quickly oxidize under the action of O3, which will accelerate the deterioration of the cutting fluid;
3. The cutting fluid has been demulsified, and centrifugal purification is ineffective; The cutting fluid has deteriorated (COD has been destroyed), and centrifugal purification is ineffective; Particles with a smaller specific gravity than water and oil with a larger specific gravity than water are ineffective in centrifugal purification;
4. Centrifugal purification cannot remove hydrogen sulfide gas and ammonia gas from water. After removing mold, there will be residual odor, but it will quickly evaporate;
5. After passing through the separator once, most of the particles and floating oil are removed. If the content is too high, multiple cycles of separation are required. The standard time for centrifugal purification of one ton of water is 4 hours.

MARTIN500 system parameters

 Residual liquid purification program and equipment layout
1. Water is diverted from the pit to an open ton bucket;
2. Use a three-point float oil suction device to extract the surface, and pass it through a separator to the diagonal bottom of the ton bucket, forming a three-dimensional diagonal circulation inside the ton passage;
3. Tons of water need to be circulated for at least 4 hours. If there is no floating oil precipitation in the observation window, the circulation purification is complete;
4. Detect the pH value and concentration of the purified cutting fluid; If the pH is above 8, it is judged as qualified. If it is less than 8, the original solution is added; The theoretical concentration value remains unchanged. If it decreases, it is added to the required concentration. If it increases, it is mixed with tap water;
5. The purification time interval should be controlled within 48 hours to reduce the volatilization of active agents and the deterioration of effective COD;
6. After purifying the ton of water, spend ten minutes cleaning the filter element and drum, and maintaining the separator; A single MARTIN500 can achieve a production capacity of 4 tons of purification within 24 hours.