In water purification, air filtration and industrial processes, anthracite filter media is widely used as a high-performance, environmentally friendly filtration medium. Its unique physical-chemical properties-high hardness, low ash content and strong adsorption capacity-make it the first choice for many industries. Yet quality varies greatly on the market, so knowing how to select the right anthracite filter media is a common concern. This article offers a comprehensive guide covering basic characteristics, key selection criteria, typical applications and precautions.
Anthracite filter media is produced from natural anthracite coal that is crushed, screened and washed. It is characterized by a fixed-carbon content usually above 90 %, low volatile matter and ash, moderate density and uniform particle size. These features give it excellent filtration performance and long service life. The material's rough surface and well-developed internal porosity effectively adsorb suspended solids, organic matter, heavy-metal ions and other impurities. Strong chemical stability, acid/alkali resistance and low risk of clogging make it suitable for long-term use.
Particle size directly affects filtration efficiency. The common range is 0.8–1.2 mm; exact specifications must match the filter system. Higher uniformity gives more stable efficiency. Check the particle-size distribution on the product label and avoid material with a wide, mixed size range.
Higher fixed-carbon content means higher purity and stronger adsorption. Premium anthracite should contain ≥90 % fixed carbon and <8 % ash. Excessive ash reduces adsorption performance and may increase back-wash frequency.
Because the media is subjected to repeated hydraulic impact and abrasion, hardness and wear resistance are critical. Hard material breaks less easily and lasts longer. A simple tap test or the manufacturer's wear-index report can provide a first assessment.
Moisture content should be as low as possible, typically <5 %, to prevent caking during storage or operation. The product must also be thoroughly washed and free of silt or other impurities that could degrade filtrate quality.
Choose manufacturers with legitimate production licences and third-party test reports. High-quality anthracite filter media is usually certified to national or industry standards such as CJ/T 43-2005.
As an economical and efficient filter medium, anthracite must be selected and used with several factors in mind. By understanding its properties, mastering the selection criteria and applying it correctly, users can fully exploit its advantages and improve overall filter performance.
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