Diatomite Microporous Ceramic Tubes for Filtration and Purification

Diatomite, also known as diatomaceous earth (DE) or kieselguhr, is a soft, porous, naturally occurring sedimentary rock formed by the fossilized remains of diatoms—single-celled aquatic photosynthetic algae that have existed on Earth for over 100 million years. These microscopic organisms possess intricate silica-based cell walls (frustules), and upon their death, their remains settle in aquatic environments such as lakes, oceans, and marshes. Over millions of years, through geological compression and mineralization, these frustules accumulate and form diatomite deposits, which are mined globally across regions with abundant ancient aquatic basins, including the United States, China, Germany, and Denmark.

Classified by processing methods, diatomite is divided into natural diatomite (mined and crushed directly) and calcined diatomite (heated at 600–1000℃ to remove organics, densify pores, and enhance filtration and mechanical performance). Food-grade and pharmaceutical-grade diatomite undergo further purification to reduce heavy metal and impurity content, meeting strict international standards such as FDA and EU food safety regulations. With abundant reserves, low processing costs, and eco-friendly characteristics, diatomite is a key sustainable material, and its application scope continues to expand with technological advancements, playing an important role in environmental protection, food safety, and advanced manufacturing industries worldwide.

Characteristics of Diatomite：

Diatomite is a naturally occurring porous sedimentary rock with unique physical and chemical characteristics, derived from fossilized diatom frustules. Its most prominent feature is its intricate porous structure, formed by the siliceous cell walls of ancient single-celled algae, with a porosity of 80%–90% and a large specific surface area, enabling strong adsorption capacity for liquids, gases, and fine particles.

Chemically, it is mainly composed of amorphous SiO₂ (80%–95% in high-quality ores), with minor impurities like Al₂O₃, Fe₂O₃ and organic matter. It is chemically inert, corrosion-resistant to acids and alkalis (except hydrofluoric acid), non-toxic and environmentally friendly, making it safe for food, pharmaceutical and environmental applications.

Thermally, diatomite boasts excellent performance: it has a high melting point (1650–1750℃), good thermal stability and low thermal conductivity, serving as an efficient thermal insulation and fire-resistant material. Additionally, it has low density, good wear resistance and superior filtration performance, with rigid frustules that maintain structural integrity under pressure.

Its only limitations are low natural plasticity and relatively low mechanical strength due to high porosity, which can be improved by modification. Overall, its unique combination of porosity, chemical stability, thermal resistance and environmental friendliness makes it a versatile material in various industries.

Advantages of Diatomite Ceramic:

Diatomite boasts a unique set of inherent advantages that make it a highly sought-after mineral across diverse industries, with its exceptional porosity and large specific surface area standing out as core strengths. These features endow it with strong adsorption and filtration capabilities, enabling efficient capture of micro-particles, heavy metals and organic impurities while allowing unobstructed flow of liquids or gases, far surpassing many conventional filter materials.

Chemically inert and non-toxic, it is safe for use in food, beverage and pharmaceutical production, requiring no special safety measures and avoiding secondary contamination of processed products. Lightweight and heat-resistant, it adds no excessive load to materials in construction and industrial applications, while enhancing thermal and sound insulation performance.

As a natural mineral, it is abundant in reserves and cost-effective to mine and process, making it an economical alternative to synthetic materials. Moreover, it is environmentally friendly—biodegradable in natural environments, and its applications as a natural insecticide and soil conditioner reduce reliance on chemical agents, aligning with sustainable development needs.

Applications of Diatomite Ceramic：

Diatomite, a porous siliceous mineral formed from fossilized diatom frustules, is widely used across industries due to its high porosity, large surface area, chemical inertness, low density and non-toxicity. Over 60% of global diatomite production serves as a filtration aid, the most dominant application. It effectively clarifies beer, wine, fruit juices, edible oils and pharmaceuticals by trapping micro-particles down to 0.1 μm, while preserving taste and nutrition. It also purifies drinking water, treats industrial wastewater and filters swimming pool water by adsorbing suspended solids, heavy metals and organic pollutants.

In construction, diatomite acts as a lightweight filler in concrete, mortar and thermal insulation materials, boosting heat and sound insulation performance. It is added to interior wall coatings to regulate indoor humidity and absorb harmful gases like formaldehyde, creating eco-friendly living spaces.

As a mild abrasive, it is used in toothpaste, facial scrubs and metal polishes, offering gentle cleaning without scratching surfaces. In agriculture, food-grade diatomite serves as a natural insecticide: its sharp particles damage insect exoskeletons and absorb lipids, causing dehydration without chemical residues. It also functions as a carrier for fertilizers and pesticides, slowing nutrient release and improving soil structure. Additionally, diatomite acts as a functional filler in plastics, rubber and paper, enhancing strength, wear resistance and product stability.