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How Do Neodymium Magnetic Manufacturers Treat Wastewater?

Due to the best power-to-weight ratio, neodymium magnets are replacing other neodymium magnets available on the market. As the demand for neodymium magnets continues to grow, so does the need for effective wastewater treatment methods. To produce these neodymium magnets, manufacturers use a variety of chemicals and metals. These chemicals can have a devastating effect on plant and animal life, and they can also contaminate drinking water supplies. As a result, the wastewater can harm the environment if not correctly disposed of.

A typical Nd-Fe-B manufacturing process creates nearly 20-30 percent of neodymium magnet waste. It makes a considerable amount disposed into the water if companies release water untreated in water sources. In this blog post, we will take a look at how some of the leading neodymium magnetic manufacturers are treating their wastewater.

How To Treat Neodymium Magnetic Wastewater?

Neodymium magnetic manufacturers can use the following methods to clean wastewater from toxic elements.

1. Magnetic Nanoadsorbants

Scientists are searching for effective ways to treat wastewater with the increased demand for pure water worldwide. They understand that there is a high need to clean and purify toxic water of industries before allowing it into water resources.

During the last two decades, nanotechnology is emerging and provided benefits to mankind in nearly all fields. Thus, scientists searched for ideal nano adsorbents to remove magnetic pollutants from neodymium and other magnetic companies’ wastewater.

An ideal magnetic nano adsorbent will have high adsorption and removal capacities. Moreover, it should have high structural and strength integrity. It should be chemically stable, cheap, and regeneratable.

Process of Purification by Using Magnetic Nano Adsorbent

  • The process includes treating wastewater with advanced magnetic nano adsorbents. However, before adding nano adsorbents, one must remove all solid particles from the water. Scientists mostly use filtration or sedimentation to remove solid wastes from polluted water.
  • In the next step, one must break down the remaining contaminants into smaller pieces. This can be done through a process called biodegradation. Once the contaminants have been broken down, they can be removed from the water through various methods, including activated carbon filters and reverse osmosis systems.
  • Finally, one can add magnetic nano adsorbents and pass the water through a magnetic field. The magnetic field will help separate magnetic pollutants from pure water by diverging their path under the magnetic field.
  • The experts then seaparte pure water from megnetic waste and regenrate nanoadsorbants.
  • In the end, the water is treated with a disinfectant to kill any remaining bacteria or viruses. Once this step is complete, the water is safe to discharge into the environment.

Some essential nano adsorbents used in the experiments were Magnetic CoFe2O4 / graphene oxide adsorbents, magnetic tubular carbon nanofibers, and magnesium-zinc ferrites. These nano adsorbents removed selected micropollutants like methylene blue, Cu2+, Cr6+, and Ni2+.

Neodymium magnetic manufacturers use such nano adsorbents to remove selected magnetic pollutants from water.

2. Removing REEs in Neodymium Magnet Waste by Leaching and Liquid-liquid Extraction

Another method through which neodymium magnetic manufacturers can treat wastewater is by removing rare earth elements from it. The chemists use leaching and liquid-liquid extraction as separation methods to extract rare earth elements.

It not only helps regeneration of REEs but also helps remove abundant chemicals and elements from wastewater. As a result, the water becomes less pollutant and offers more benefits to the chemical industry.

Chemists use various acids in the leaching method and found that glycolic and malic acids are more efficient than others. Moreover, liquid-liquid extraction results best when concluded with D2EHPA (Di-(2-Ethylhexyl)phosphoric acid).

3. Magnetic Water Treatment

Magnetic water treatment is a process that involves passing wastewater through a magnetic field. Simply put, neodymium magnet manufacturers pass the wastewater from a pipe surrounded by strong neodymium magnets.

Although this process does not remove calcium and other non-magnetic particles, it is quite helpful in eliminating magnetic waste from water. There are not many studies that support the effectiveness of this method. However, it softens hard water coming directly from magnetic manufacturing units.

A study published in 2003 declared magnetic separation as an alternative to expensive wastewater treatment. Magnetic water treatment applies to large-scale manufacturing units and is considered economically feasible.

The water from neodymium magnet manufacturing companies contains an enormous amount of magnetic waste. As a result, neodymium magnet manufacturers use magnetic water treatment to lower the toxicity of wastewater.

The procedure of Purification by Using Magnetic Water Treatment

  • Water Treatment Softeners at Home

Most people near neodymium magnet manufacturing companies often use magnetic water softeners at home. Such low-scale water softeners help eliminate magnetic toxins from drinking water to make it healthier.

Such softeners do not help remove hard water elements like calcium and magnesium. However, they are quite beneficial in removing life-threatening toxic neodymium magnets from drinking water.

  • Water Treatment Plants at Larger Scale

Large companies and neodymium magnet manufacturing units like neodymium companies use the same procedure to reduce neodymium magnet waste from water. First of all, companies remove solid waste through filtration or sedimentation. The next step involves passing water through a strong magnetic field.

It helps remove magnetic waste from pure water. The process helps neodymium manufacturers to regenerate the neodymium magnet pieces that fell off as waste. While AOPs are not the only wastewater treatment option available to neodymium magnet manufacturers, they are a viable option that can provide effective treatment. Manufacturers should work with experienced wastewater treatment experts to determine if AOPs are the right solution for their specific needs.

4. Advanced Oxidation Process

There have been wastewater treatment procedures since the 1980s that can remove inorganic, organic, and other traceable contaminants. Hundreds and thousands of studies support the effectiveness of the advanced oxidation process.

It is non-admirable for large-scale companies to release magnetic waste into water sources without removing organic, inorganic, and other pollutants. As a result, neodymium manufacturing companies apply advanced oxidation processes to remove organic, inorganic, and minor contaminants.

AOP can be done by two main methods: hydroxyl and sulfate radical-based.

Hydroxyl Radical-based Advanced Oxidation Process

This advanced oxidation process further involves using ozone, UV rays, and Fenton radical mechanism.

O3 can easily react with ionized forms of organic compounds and produce OH as the end product. It makes waste removal easier as a by-product.

Another popular AOP used for neodymium magnet wastewater treatment is UV/hydrogen peroxide treatment. In this process, UV light is used to generate hydrogen peroxide. The hydrogen peroxide then reacts with the contaminants in the wastewater, breaking them down into simpler molecules.

Sulfate Radical-based Advanced Oxidation Process

S2O8 2− is also a strong oxidant that can break down targeted pollutants into OH and respective sulfate ions.

In general, during an advanced oxidation process, multiple oxidation reactions take place simultaneously, which further adds to the effectiveness of the process.

Advantages of Advanced Oxidation Process

The advanced oxidation process proves to be highly effective for neodymium magnet manufacturers as it helps further reduce water pollution. The neodymium magnet manufacturing process results in the water’s magnetic and other organic and inorganic waste. As a result, chemists must ensure that all kinds of contaminants are eliminated before releasing the water.

Where the three methods mentioned above help remove magnetic waste, AOPs help removes trace, organic and inorganic contaminants.

Challenges associated with the Advanced Oxidation Process

AOPs are an effective way to treat neodymium magnet manufacturing wastewater because they can break down various organic contaminants. However, AOPs are not without their challenges. One of the biggest challenges associated with using AOPs for neodymium magnet wastewater treatment is that they can be costly.

Additionally, AOPs can produce harmful by-products, such as chlorine gas. As a result, it is essential for manufacturers to carefully consider the benefits and drawbacks of using AOPs before deciding if they are the right solution for their wastewater treatment needs.

Apart from these, the advanced oxidation process is an expensive way to clean contaminated water. There is a further need to develop cost-effective advanced oxidation processes for the future.


In conclusion, neodymium magnetic manufacturers must properly treat any wastewater produced in the manufacturing process. This can be done through various methods, such as filtration, magnetic nano adsorbents, magnetic water treatment, AOPs, etc.

When cleaning contaminated water, neodymium manufacturers should remember that they can not ignore organic and inorganic contaminants in water. Such companies must apply magnetic and chemical removal procedures to ensure the high quality of water leaving their buildings.

Despite the challenges, many neodymium magnetic manufacturers are committed to treating wastewater and reducing its environmental impact. By investing in treatment facilities and working with environmental experts, these companies are helping to safeguard our water resources for future generations.


Article by

ROBO Magnetic Product Team

We are the manufacturer with 16 years of experience in custom neodymium magnets.

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