recycling technology of waste release agent, hydraulic oil and cutting fluid

2023-10-30

Discussion on recycling technology of waste release agent, hydraulic oil and cutting fluid

Release agent wastewater treatment

Current status

The release agent is the solvent used in the process of mold cooling and product release in die casting production. In the process of use, part of the release agent is consumed in the process of use, and some of it enters the sewage treatment system or is directly discharged through the sewage pipe, which either generates a large amount of treatment costs or causes pollution to the environment. There's no good way to do it or recycle it perfectly.

Problems that need to be solved

Due to the different quality of the release agent and the different formula, the degree of emulsification of the liquid is different, and the solid content of the release agent is different. If the release agent needs to be recovered, the following problems need to be solved:

1. Impurities: filter to the appropriate accuracy, without affecting the effective ingredients in the release agent, but also to filter out impurities, can not block the nozzle;

2. Waste oil: filter out the oil in the release agent, prevent the product from having yellow spots, black spots, and prevent the breeding of bacteria in the process;

3. Deodorization and sterilization: inhibit the bacteria that have been produced to prevent the liquid from stinking;

4. Concentration determination: automatically match the required concentration to prevent sticking, drawing and straining.

solution

1. Pretreatment: The oil-water separation device is installed on the waste liquid pool to remove the surface oil slick in the waste liquid pool and improve the efficiency and capacity of post-treatment;

2. Filter impurities: divided into two filtration: primary filtration to solve the problem of waxed oil paste filter surface in the release agent, secondary selection of appropriate precision filter impurities;

3. Filter oil slick: divided into two filtration: the oil-water separation device is used to separate the surface oil slick, and the oil suction device is used to separate the unseparated oil in the release agent;

4. Concentration determination: According to the difference of the recovered liquid, the concentration of the recovered release agent is determined by professional instruments, and the required release agent stock liquid is added accordingly to achieve the required concentration;

Hydraulic system waste oil treatment

Current status

At present, the die-casting machine mainly uses two kinds of anti-wear hydraulic oil and water glycol anti-fire hydraulic oil, and the waste oil is mainly caused by oil change, and there are generally two reasons for oil change: one is a regular oil change, the second is the equipment card valve and other faults such as oil change or water leakage emulsification oil change, the waste oil replaced is either illegally sold to small oil sellers, or spend a lot of costs for environmental protection.

Problems that need to be solved

1. Filter the impurities in the waste oil to about the new oil standard NAS9;

2. Filter the moisture in the waste oil to the new oil standard;

3. The viscosity reaches the new oil standard.

solution

1. Impurities: It is necessary to use multi-stage filtration, through the polymer filter and imported glass fiber filter, the waste oil is filtered step by step to the new oil NAS9

2. Emulsified water: For the oil products emulsified with water, the water can only be evaporated by vacuum heating

3. Trace moisture: For trace moisture, there is no need to heat the oil to solve it, and the trace moisture is removed through the filter element of the polymer modified material.

4. Viscosity: When impurities and moisture reach the new oil standard, the general viscosity is already a problem without consideration.

Cutting fluid waste treatment

Current status

In the die-casting products after the machining process, will use a lot of cutting fluid, the main source of waste cutting fluid is two, one is due to the use of a long time of liquid odor regular replacement of the waste cutting fluid, the second is the waste cutting fluid brought out of the waste cutting fluid in the process of product processing, environmental pressure increases, the current cutting fluid either recycling or spend a lot of costs outsourced.

Problems that need to be solved

The main reason for most of the cutting fluid waste is the replacement of the liquid for a long time to smell, the cutting fluid on the waste is generally because of fine impurities and oil slick too much and can not be used, there are two main ways to solve the problem of cutting fluid waste:

Online maintenance: try to extend the service life of the cutting fluid, it is best to always add without replacing;

Offline filtration: deep purification of the replaced cutting fluid to meet the standards that can be used.

Either way, such as reuse needs to solve the following problems:

1. Filter the waste oil in the waste cutting fluid;

2. Filter impurities in waste cutting fluid;

3. Deodorization and sterilization.

solution

1. Online filtering:

Mobile online filter, immediately remove the oil slick in the CNC, reduce the chance of bacteria generation, sterilization and deodorization of the bacteria that have been generated, and filter the impurities suspended in the cutting fluid.

2. Deep purification:

If the liquid is replaced regularly, it is cleaner in filtering impurities, oil slicks and sterilization than the online filtration purification, filtered to the state that can be used, and re-added to the machine for use.

3. Liquid tank cleaning:

The service life of the cutting fluid is not only affected by the oil slick bacteria, but also affected by the impurities at the bottom of the machine, regularly cleaning the internal debris of the machine is a necessary work, and the cleaning machine needs a lot of labor, delayed production and processing, the ground sprinkling drip, etc., through professional equipment to quickly clean up impurities

4. Centralized liquid supply and return system:

Automatically continue to add quantitative cutting fluid to each machine, overflow to the liquid return tank through the top of the liquid tank, and then pump the liquid back to the filtration system through the constant pressure liquid supply system to the machine, so that the cutting fluid has been flowing up, to achieve no need to change the liquid, just add the liquid state, when the liquid is missing, Automatically fill the new liquid into the liquid supply system according to the set proportion, and monitor the daily use of raw liquid and water at any time.

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