Physical Characteristics
Appearance and Shape: It appears as black granules with uniform particle sizes and relatively smooth surfaces. This shape is convenient for filling and operation in the adsorption equipment used in gold extraction (such as adsorption columns, agitated tanks, etc.), allowing the slurry or gold-containing solution to pass through the activated carbon layer evenly, ensuring the uniformity and efficiency of adsorption.
Iodine Value: It has a relatively high iodine value, generally ranging from 900 - 1200mg/g. A high iodine value indicates that its micropore structure is well-developed and it has a strong adsorption capacity for small molecular substances such as gold ions. It can effectively capture gold ions in solutions and help improve the extraction efficiency of gold.
Particle Size: It is usually in granular form, with a particle size of around 0.5 - 2.0mm. This particle size is convenient for filling in the adsorption equipment used in gold extraction. The moderate particle size ensures sufficient specific surface area for adsorption and enables the slurry or gold-containing solution to maintain good fluidity when passing through the activated carbon layer, ensuring the smooth progress of the adsorption process.
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Specific Surface Area: It has a large specific surface area, generally ranging from 1000 - 1500m²/g. The vast specific surface area provides a large number of adsorption sites for gold ions, allowing the activated carbon to effectively adsorb gold ions even in solutions with low gold content and improve the recovery rate of gold.
Strength: It has good mechanical strength, and the compressive strength can usually reach more than 80% - 95%. During the gold extraction process, especially when using methods like agitated adsorption, the activated carbon needs to withstand certain mechanical collisions and friction. Good strength can ensure that the activated carbon granules do not break, maintain the stability of the adsorption bed layer, and prevent the decline in adsorption efficiency and subsequent separation difficulties caused by the breakage of activated carbon.
Ash Content: The ash content is relatively low, generally ranging from 3% - 8%. A lower ash content can reduce the interference of impurities in the gold extraction process and ensure the purity and high efficiency of the activated carbon in adsorbing gold ions.
Pore Structure: It has an abundant system of micropores, mesopores, and macropores. Micropores (with a pore diameter less than 2nm) are the main parts for adsorbing gold ions, and their powerful adsorption force can effectively capture gold ions. Mesopores (with a pore diameter between 2 - 50nm) play a bridging role between micropores and macropores in the adsorption process, facilitating the diffusion and adsorption of gold ions inside the activated carbon. Macropores (with a pore diameter greater than 50nm) mainly provide macroscopic channels, enabling the slurry or gold-containing solution to smoothly enter the internal pore network of the activated carbon, reducing the resistance when the solution passes through and ensuring the smooth progress of the adsorption process. This multi-level pore structure enables it to adapt to the gold extraction process under different conditions and effectively adsorb gold ions.
Density Characteristics: The bulk density is generally between 0.4 - 0.6g/cm³. A suitable bulk density is beneficial for reasonably filling the activated carbon in the adsorption equipment, ensuring that there is enough mass of activated carbon for adsorbing gold ions, and preventing difficulties in the passage of the slurry or gold-containing solution due to excessive density, which would affect the efficiency of gold extraction.
High Adsorption Efficiency: Thanks to its developed pore structure and high specific surface area, it has a powerful adsorption ability for gold ions. It can quickly and efficiently adsorb gold ions even in solutions with low gold content, significantly improving the extraction rate of gold, reducing the residue of gold in tailings and other wastes, and improving the resource recovery rate.
Selective Adsorption: It has a good selective adsorption ability for gold ions. In complex slurry or leachate environments, it can preferentially adsorb gold ions while adsorbing relatively less of other common metal ions (such as copper, iron, zinc, etc.), thereby reducing the difficulty of subsequent separation and purification and lowering the production cost.
Good Chemical Stability: In the chemical environments commonly used in the gold extraction process, such as cyanide solutions, it has stable chemical properties. It will not react with gold ions and other chemical reagents to cause the loss of gold ions or the decline in the performance of the activated carbon, and can stably play its adsorption role, ensuring the reliability of the gold extraction process.
The economic viability of a gold mine often hinges on the efficiency of the adsorption circuit. Our product features an exceptional K-value, which represents the equilibrium loading capacity of gold onto the carbon. This allows for a higher concentration of gold to be loaded per ton of carbon, reducing the frequency of stripping and elution cycles required. By enhancing the adsorption kinetics, our coconut shell activated carbon reduces the soluble gold losses in the barren solution. This high-capacity performance is particularly beneficial for mines processing high-grade ores or those looking to optimize the throughput of their existing elution columns without capital expansion.
Renewable Utilization: The coconut shell activated carbon after adsorption saturation can restore its adsorption performance through appropriate regeneration methods such as desorption and activation to achieve cyclic use. This not only reduces the cost of gold extraction but also reduces the generation of activated carbon waste, conforming to the concepts of environmental protection and sustainable development.
Tailings Reutilization: For the secondary recovery and utilization of some historical tailings or low-grade tailings. By reprocessing the tailings, the residual gold ions in them can be adsorbed by the coconut shell activated carbon, thus recovering gold from waste resources, improving the overall utilization rate of gold resources, and reducing resource waste.
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About Us
Since its inception in 2003, Chengde Tianyuan Activated Carbon Co., Ltd. has established itself as a dedicated source manufacturer in the field of industrial filtration media. Based in Pingquan, Hebei, our factory specializes in the production of high-performance adsorption materials, with a particular focus on the mining sector. We leverage our proximity to premium raw materials and advanced activation technologies to produce gold recovery activated carbon that meets international standards. With an annual capacity of 8,800 tons and ISO9001 certification, we support gold mining operations globally—from Southeast Asia to Africa—providing them with durable, high-activity products. Our integrated supply chain ensures that international clients receive direct-from-factory pricing and consistent quality assurance for their critical metal recovery processes.
