How can the filtration challenge of highly alkaline cuprous oxide powder be overcome?

Release time:

2026-05-27

In fields such as electronic pastes, conductive materials, catalysts, and advanced powder metallurgy, cuprous oxide powder is increasingly becoming a critical functional material. In particular, within the realm of next‑generation electronic materials and high‑end copper‑based conductive systems, manufacturers are imposing ever stricter requirements on the particle size, purity, impurity control, and post‑processing cleanliness of cuprous oxide powder.

Pilot-Scale Application of Xadías’ New Nano‑Micropowder Filtration Machine in Copper-Based Advanced Materials

In fields such as electronic pastes, conductive materials, catalysts, and advanced powder metallurgy, cuprous oxide powder is increasingly becoming a critical functional material. In particular, within the realm of next‑generation electronic materials and high‑end copper‑based conductive systems, manufacturers are imposing ever stricter requirements on the particle size, purity, impurity control, and post‑processing cleanliness of cuprous oxide powder.

However, for many manufacturing enterprises, the real challenge lies not in “milling” but in downstream solid–liquid separation and washing.

Especially when materials enter a micro- and nanoscale system, conventional filtration equipment often encounters:

Severe fine-particle carryover;

The filtrate is cloudy;

The filter cake has a high liquid content.

Low washing efficiency;

The filter cloth is prone to clogging;

Cuprous oxide is prone to oxidation and discoloration;

High-alkali systems impose stringent requirements on equipment stability.

High-viscosity solvents such as ethylene glycol have slow filtration rates.

These issues are increasingly becoming critical bottlenecks that constrain the stable production of copper-based powder materials.

Recently, Xiamen Xiadidas Filter Materials Technology Co., Ltd. conducted a pilot-scale trial for a cuprous oxide powder project undertaken by a new‑materials company, once again demonstrating the new nanomicro‑powder filtration machine’s capability in the high‑end powder‑material sector.

I. Project Background: Pilot-Scale Filtration of High-Alkalinity Cuprous Oxide Powder

The material handled by the customer this time is cuprous oxide powder.

Unlike conventional metal powders, this class of materials presents several typical processing challenges:

1. The material is highly susceptible to oxidation.

Cuprous oxide itself is highly sensitive to air, temperature, and process fluctuations; if the filtration process is excessively prolonged or localized oxidation occurs, it will directly affect the powder’s color, electrical conductivity, and the stability of downstream products.

2. The solvent system is unique.

In this study, ethylene glycol was used as the solvent.

At room temperature, its viscosity reaches 14.9 mPa·s, significantly higher than that of ordinary water, which implies:

Higher filtration resistance;

The filter cake forms more slowly;

Washing and displacement are more difficult;

Conventional filtration equipment is prone to clogging and efficiency degradation.

3. High-alkalinity environment

The pH of the stock solution reaches 12–13.

High-alkali operating conditions not only impose stringent requirements on the stability of filter materials but also affect the surface characteristics of the powder and the structural stability of the filtration system.

4. The customer has stringent process requirements.

The customer not only requires solid–liquid separation but also demands a pure water wash, with the final wash pH adjusted to 7.

This means that the device must not only be able to “filter effectively,” but also possess:

High-efficiency washing performance;

Good filter cake permeability;

Stable replacement efficiency;

Extremely low particle loss rate.

II. Pilot-Scale Process Parameters

The main operating conditions of this pilot-scale test are as follows:

Material handled: Cuprous oxide powder

Solvent system: ethylene glycol

Solvent viscosity: 14.9 mPa·s (at room temperature)

Solid–liquid concentration: approximately 7%

Original solution pH: 12–13

Process objective: Solid–liquid separation + pure water washing

Washing endpoint: final wash pH = 7

Pilot-scale processing capacity: 100 L/h

The entire process was conducted as a continuous pilot-scale trial using Xadiyas’ newly developed nano‑micro powder filtration unit.

III. Why is it difficult for conventional filtration equipment to handle cuprous oxide powder?

Many companies still use the following approach when handling copper-based fine powders:

Plate-and-frame filter press;

Centrifuge;

Bag filtration;

Conventional vacuum filtration;

Filter element filtration and other methods.

However, as particles progressively shrink to the micrometer and submicrometer scale, the limitations of conventional equipment become rapidly apparent.

In particular, in ethylene glycol systems, an increase in viscosity leads to a significant rise in filtration resistance.

Common issues include:

The filtrate is not clear.

Fine particles penetrate the filter bed, causing the filtrate to become turbid.

The filter cake is severely compacted.

High-viscosity systems tend to cause the filter cake to become densely compacted, making subsequent washing difficult.

Low washing efficiency

Pure water cannot rapidly displace ethylene glycol, resulting in long washing times and high water consumption.

The filter cloth clogs quickly.

Fine particles readily become embedded in the structure of conventional filter fabrics, leading to a rapid decline in filtration flux.

Increased risk of material oxidation

A prolonged filtration cycle increases the exposure time of cuprous oxide.

For high-value copper-based materials, the occurrence of oxidation, agglomeration, or residual impurities often results in a decline in the value of the entire batch.

IV. Technical Advantages of the New Nano‑Micropowder Filtration Machine

When dealing with complex systems such as cuprous oxide powder, Xadis’s new nano‑micro‑powder filtration machine demonstrates clear advantages.

1. Highly efficient retention of micro- and nanoscale particles

The device features a specialized filtration structure designed for particles at the micro- and nanoscale.

Even when processing ultrafine copper-based powders, it can still maintain a high retention rate and clear filtrate clarity.

Compared with conventional filtration methods, its core lies not merely in “reducing pore size,” but rather in:

Multi-level filtering structure;

Stable differential pressure control;

Dynamic filtration mechanism;

Uniform filter cake formation;

Achieve stable, continuous filtration.

2. Compatible with high-viscosity solvent systems

The greatest challenge of the ethylene glycol system lies in its poor liquid fluidity.

When processing medium- to high-viscosity systems, Xadías equipment can maintain a stable filtration flux through process parameter adjustments and optimized filtration design.

For:

Ethylene glycol;

NMP;

PEG;

High-concentration organic system;

All possess strong adaptability.

3. Integrated filtration and washing

In this project, the client’s key requirements are:

“The final wash pH reaches 7.”

This essentially means that the equipment must have a high-efficiency displacement capability.

Traditional equipment often has the following issues:

Doesn’t wash thoroughly;

Long washing time;

High residual liquid rate;

and other issues.

Meanwhile, Xadiyas’ new nano‑micropowder filtration machine can achieve:

The filter cake is formed uniformly;

The cleaning solution penetrates thoroughly;

Multi-stage continuous washing;

Effectively improves washing efficiency.

Ultimately, this pilot-scale trial successfully achieved:

Pure water washing;

The final washing pH stabilizes at 7.

Meet the customer’s process requirements.

4. Reduce the risk of oxidation

Cuprous oxide is most vulnerable to prolonged filtration time.

Xadías equipment employs a closed‑system filtration concept, which can effectively reduce:

Air contact;

Oxidation risk;

Probability of secondary pollution.

This is particularly important for highly reactive metal powders.

V. Pilot-Scale Results: The project met the customer’s objectives and received high praise from the client.

After continuous pilot-scale operation:

Solid–liquid separation is stable;

The filtrate is clear;

The washing performance meets the requirements.

The final washing pH was adjusted to 7;

The equipment operates stably.

The filtration efficiency meets the process requirements.

The customer expressed satisfaction with the overall filtration performance and washing capability.

In particular, under conditions of high alkalinity, high viscosity, and strong oxidizability, the equipment continues to operate stably, which holds significant reference value for the copper‑based materials industry.

VI. From Copper Powder to New Materials: Nanoscale and Micron-Scale Filtration Is Becoming a Key Process

At present, the high-end powder materials industry is undergoing rapid upgrading.

Especially in:

New energy materials;

Electronic paste;

Semiconductor materials;

Copper powder, silver powder;

Nano-oxides;

Carbon materials;

High-purity metal powders;

In fields such as these, filtration has long ceased to be merely a simple “solid–liquid separation.”

It begins to have a direct impact:

Product purity;

Particle size stability;

Impurity control;

Backend performance;

Yield and cost.

Traditional filtration equipment primarily addresses the issue of “being able to filter.”

Meanwhile, the new generation of nano‑ and microfiltration technology is beginning to address:

“How to achieve precise filtration, clean filtration, and stable filtration.”

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VII. Xiadaias: Advancing Nanomicro-Powder Filtration to a New Stage

As a leading brand in China’s research and manufacturing sector for filtration materials (mesh belts), Xiamen Xiadis Filtration Materials Technology Co., Ltd. With over 30 years of dedicated expertise in the industrial filtration sector.

The company is not only a key driver of technological advancement in the filtration materials industry but also continuously advances the research and development of high-end solid–liquid separation equipment.

At present, Xadiyas’ new nano‑micropowder filtration machine has been gradually put into use in:

Silver powder;

Copper powder;

Nano-silicon;

Carbon materials;

Oxide powder;

Electronic paste;

Semiconductor materials;

Fine chemicals;

and several other high-end sectors.

In the future, as high-end manufacturing places ever‑higher demands on powder purity and cleanliness, nanometer‑ and micrometer‑scale filtration technologies are emerging as a critical and indispensable link in the new materials value chain.


 

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Why do so many nanopowder projects ultimately fail at the filtration and washing stages?

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Pilot-Scale Application Record of a Novel Nanomicro-Powder Filtration System in the Alkaline Oxide Water-Washing Separation Process — An Engineering Pathway for Efficient Dealkalization and Stable Recovery of Nanoscale Powders

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