Élimination des métaux Charbon actif
Buy Metal Removal Activated Carbon
The environmental cleanup of water flows containing dissolved heavy metals (lead, mercury, copper, cadmium and arsenic) is often accomplished using activated carbon. Activated carbon is a remarkable filter medium because of its very porous internal structure with large surface area. This structure provided vast numbers of surface sites where adsorption can occur. The metal ions in solution are attracted to the surface of the carbon by physical adsorption, electrostatic attraction and sometimes chemisorption. Although “plain” activated carbon has some inherent capacity to remove metals, modifying or impregnating solid carbon can greatly enhance metal removal ability.
Les défis de l'industrie
Selectivity Constraints
- Activated Carbons have differing adsorption efficacy when removing various metals (e.g., improved removal of lead but low removal of copper/iron).
- Chemically modified MRAC concentrates its efficacy, but is ultimately also limited when treating complex multi-metal streams as in mixing mining effluents that contain gold, silver, zinc or nickel.
Competitive Interference
- Non-target ions (calcium, organic compounds) compete with heavy metals (cadmium, copper) for adsorption sites in industrial wastewater.
- pH fluctuations further disrupt binding stability and ion selectivity.
Limites de la régénération
- Recovering precious metals (silver, gold-cyanide complexes) via acid washing is inefficient.
- Incomplete impurity removal (iron/calcium salts) and reduced metal recovery rates occur during regeneration cycles.
Material Degradation
- Repeated regeneration diminishes porosity and functional group effectiveness.
- Pore blockage from oils/organics or chemical degradation necessitates frequent carbon replacement.
Hazardous Waste Management
- Spent carbon loaded with toxic metals requires specialized hazardous waste disposal.
- Sustainable regeneration technologies remain underdeveloped, creating logistical and environmental burdens.
types de charbon actif apparentés
- Valeur en iode : 600-1200
- Taille des mailles : 1×4/4×8/8×16/8×30/12×40/20×40/20×50/30×60/40×70 (autres tailles sur demande)
- Densité apparente : 400-700
- Valeur de l'iode : 500-1300
- Taille des mailles : 0,9-1mm/1,5-2mm/3-4mm/6mm/8mm(autres tailles sur demande)
- Densité apparente : 450-600
- Valeur de l'iode : 500-1300
- Maillage : 150/200/300/350 (autres dimensions sur demande)
- Densité apparente : 450 - 550
- Valeur en iode : 400-800
- Taille des mailles : 100×100×100mm/100×100×50mm (densité cellulaire personnalisée sur demande)
- Densité apparente : 350-450
- Diamètre de l'alésage：1.5-8mm
- Indice d'iode : 700-1200 mg/g
- Surface : 700-1200 m²/g
- Densité apparente : 320-550 kg/m³
- Indice d'iode : 700-1200 mg/g
- Surface : 700-1200 m²/g
- Densité apparente : 320-550 kg/m³
- Indice d'iode : 700-1200 mg/g
- Surface : 700-1200 m²/g
- Densité apparente : 300-650 kg/m³
- Indice d'iode : 700-1200 mg/g
- Surface : 700-1200 m²/g
- Densité apparente : 320-550 kg/m³
- Méthode d'activation : Activation par vapeur/gaz à haute température
- Structure des pores : Dominée par les micropores, distribution uniforme des pores
- Profil environnemental : Sans produits chimiques, faible teneur en cendres
- Applications principales : Adsorption en phase gazeuse, purification de l'eau potable
- Méthode d'activation : Activation chimique (par exemple, H₃PO₄/ZnCl₂) à des températures modérées.
- Structure des pores : Riche en mésopores, surface plus élevée
- Efficacité du processus : Temps d'activation plus court, rendement plus élevé 30-50%
- Post-traitement : Lavage à l'acide nécessaire pour éliminer les résidus
- Fonctionnalisation : Chargé d'agents actifs (par exemple, I₂/Ag/KOH)
- Adsorption ciblée : Amélioration de la capture de polluants spécifiques (par exemple, Hg⁰/H₂S/gaz acides).
- Personnalisation : Optimisation chimique pour les contaminants ciblés
- Applications principales : Traitement des gaz industriels, protection CBRN
Pourquoi utiliser notre charbon actif
Superior Adsorption Selectivity：
For precious and heavy metals due to engineered surface functional groups.
Enhanced Mechanical Durability ：
Minimizes carbon loss during regeneration cycles in harsh mining environments.
Optimized Pore Structure ：
Maximizes metal-loading capacity while resisting pore blockage from organic contaminants.
Sustainable Regeneration Capability
Maintains high performance through multiple thermal/reactivation cycles.
Proven Efficiency
In complex multi-metal streams like acid mine drainage and mineral processing effluents.
Processus et technologie
1. Precious Metal Recovery from Mining Wastewater
Aperçu de la solution
Activated carbon adsorbs residual gold, silver, and other valuable metals from mineral processing wastewater (e.g., cyanide tailings). Parameters like carbon type, pH, and flow rate are optimized to maximize metal recovery.
Principaux avantages
- Selective adsorption: Targets low-concentration precious metals (e.g., 0.3 g/t gold) even in complex wastewater streams.
- Resource circularity: Transforms waste (e.g., tailings) into a metal resource, aligning with sustainable mining practices.
- Process flexibility: Tunable via carbon modification (e.g., acid-washed or OMC carbons) to enhance metal-binding capacity.
2. Heavy Metal Remediation in Acid Mine Drainage
Aperçu de la solution
Acid-modified activated carbon treats Sb²⁺, As, and other heavy metals in mining-impacted soils or acidic pit water. A two-stage adsorption process at optimized pH (e.g., pH 5) immobilizes metals via surface complexation.
Principaux avantages
- Multi-metal capture: Simultaneously immobilizes Sb (up to 97%) and As (up to 67%) by suppressing Fe(III) reduction and DOM shuttling in flooded soils.
- Enhanced material properties: Acid modification increases surface area and acidic functional groups, improving adsorption kinetics.
- Regulatory compliance: Reduces Sb²⁺ to <0.02 mg/L, meeting surface water Class III standards.
3. Soil Remediation for Mining-Impacted Areas
Aperçu de la solution
Activated carbon amendments reduce mobilization of Sb and As in flooded mine soils by adsorbing dissolved organic matter (DOM), which inhibits microbial Fe(III) reduction and subsequent metal release.
Principaux avantages
- Risk mitigation: Lowers bioavailability and leaching of toxic metals, preventing entry into the food chain.
- Long-term stability: Maintains metal immobilization under anaerobic conditions typical of flooded mine sites.
- Material superiority: Outperforms biochar in DOM adsorption due to higher microporosity and surface functionality.
4. Advanced Carbon Modifications for Enhanced Performance
Aperçu de la solution
Oxidatively Modified Carbon (OMC) or MMT-impregnated carbon are engineered for superior gold adsorption. OMC mimics graphene oxide's structure for high gold-cyanide affinity, while MMT-carbon enables full thermal regeneration.
Principaux avantages
- Superior capacity: OMC exceeds commercial carbons in gold adsorption due to GO-like surface chemistry; MMT-carbon achieves 100% desorption with thiosulfate.
- Eco-regeneration: MMT decomposes completely into gases, eliminating secondary waste.
- Renewable material: Coconut shell-based carbons offer high microporosity (>85% surface area), mechanical strength, and low ash content.
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