Carvão ativado para remoção de metais
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.
Desafios do sector
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.
Regeneration Limitations
- 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.
tipos relacionados de carvão ativado
- Valor de iodo: 600-1200
- Tamanho da malha: 1×4/4×8/8×16/8×30/12×40/20×40/20×50/30×60/40×70 (Mais tamanho a pedido)
- Densidade aparente: 400-700
- Valor de iodo: 500-1300
- Tamanho da malha:0.9-1mm/1.5-2mm/3-4mm/6mm/8mm(Mais tamanho a pedido)
- Densidade aparente: 450-600
- Valor de iodo: 500-1300
- Dimensão da malha: 150/200/300/350 (outras dimensões a pedido)
- Densidade aparente: 450 - 550
- Valor de iodo: 400-800
- Tamanho da malha: 100×100×100mm/100×100×50mm (densidade celular personalizada a pedido)
- Densidade aparente: 350-450
- Diâmetro do furo: 1,5-8 mm
- Valor de iodo: 700-1200 mg/g
- Área de superfície: 700-1200 m²/g
- Densidade aparente: 320-550 kg/m³
- Valor de iodo: 700-1200 mg/g
- Área de superfície: 700-1200 m²/g
- Densidade aparente: 320-550 kg/m³
- Valor de iodo: 700-1200 mg/g
- Área de superfície: 700-1200 m²/g
- Densidade aparente: 300-650 kg/m³
- Valor de iodo: 700-1200 mg/g
- Área de superfície: 700-1200 m²/g
- Densidade aparente: 320-550 kg/m³
- Método de ativação: Ativação por vapor/gás a altas temperaturas
- Estrutura de poros: Microporosa dominada, distribuição uniforme dos poros
- Perfil ambiental: Sem químicos, baixo teor de cinzas
- Aplicações principais: Adsorção em fase gasosa, purificação de água potável
- Método de ativação: Ativação química (por exemplo, H₃PO₄/ZnCl₂) a temperaturas moderadas
- Estrutura de poros: Mesoporoso-rico, maior área de superfície
- Eficiência do processo: Tempo de ativação mais curto, rendimento 30-50% mais elevado
- Pós-tratamento: É necessária uma lavagem com ácido para remover os resíduos
- Funcionalização: Carregado com agentes activos (por exemplo, I₂/Ag/KOH)
- Adsorção direcionada: Captura melhorada de poluentes específicos (por exemplo, Hg⁰/H₂S/gases ácidos)
- Personalização: Quimicamente optimizado para contaminantes alvo
- Aplicações principais: Tratamento de gases industriais, proteção CBRN
Porquê utilizar o nosso carvão ativado
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.
Processo e tecnologia
1. Precious Metal Recovery from Mining Wastewater
Visão geral da solução
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.
Principais vantagens
- 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
Visão geral da solução
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.
Principais vantagens
- 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
Visão geral da solução
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.
Principais vantagens
- 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
Visão geral da solução
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.
Principais vantagens
- 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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