Do You Know The Reasons For The High Price Of Gold Recovery Activated Carbon?

1. High cost of raw materials 
High-quality raw material selection: gold recovery usually uses coconut shell activated carbon, which can efficiently adsorb gold-cyanine complexes in the solution (e.g. [Au( CN)₂]-) in solution. Coconut shell raw material is imported (e.g., from Southeast Asia), and the cost is significantly higher than that of coal or wood activated carbon.
Purity requirements: the ash content needs to be strictly controlled (usually less than 3%) to avoid impurities interfering with the adsorption of gold, and the cost of raw material screening and treatment increases.

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2. Special preparation process 
High-temperature activation and modification: physical activation (high-temperature steam) or chemical activation (phosphoric acid, zinc chloride) to form a pore size suitable for gold adsorption (0.5-2 nm), and some of them need to be loaded with sulphide and other functional groups to enhance the specific adsorption of gold.
Post-treatment is complicated: acid washing, water washing and other steps are required to remove residues and ensure the chemical stability of the activated carbon, and the process energy consumption and time-consuming costs are high.
3. High performance index requirements 
Large adsorption capacity: the gold recovery activated carbon needs to have a gold loading capacity of 10-30 g/kg (much higher than ordinary activated carbon), and the adsorption efficiency is required to be >95%, which directly affects the recovery rate.
Strength and abrasion resistance: it needs to withstand mechanical abrasion in stirring or flow adsorption, and the abrasion resistance strength is >95% (ASTM standard) to avoid chalking loss.
Regeneration capacity: need to support 5-10 high temperature (700 ℃) or chemical regeneration cycle, regeneration adsorption rate to maintain more than 80%, the technical threshold is high.