1000 Iodine Value Coconut Shell Carbon for Gold Recovery

Huajing's 1000 Iodine Value Coconut Shell Carbon for Gold Recovery is a key consumable material in large-scale CIP/CIL and heap leaching gold extraction processes. In the field of gold extraction, an iodine value of ≥ 1000mg/g is the dividing line that distinguishes ordinary carbon from high-efficiency carbon. We use high-quality coconut shells from Southeast Asia, which are refined through a series of processes including carbonization and high-temperature physical activation with steam. This product features excellent mechanical strength, strong adsorption capacity, fast gold extraction speed, and easy decomposition. It is widely applicable in gold extraction and tail liquid recovery in the carbon slurry method and heap leaching method for gold extraction, as well as in the extraction of precious metals such as gold and platinum in wet metallurgy.

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Product Description

The core of gold extraction is to separate and concentrate the gold element from the cyanide ore pulp/leaching solution. Coconut shell activated carbon achieves efficient gold capture through a triple synergistic mechanism:
First, physical adsorption - The high iodine value coconut shell carbon has a specific surface area of 1000-1600 m²/g, with micropores (less than 2nm) accounting for ≥60%, which perfectly matches the size of the gold cyanide complex (with a molecular diameter of approximately 0.5nm).
Second, chemical adsorption - The activated carbon surface is rich in oxygen-containing functional groups such as carboxyl and phenolic hydroxyl groups, which can specifically adsorb cationic complexes through electrostatic interactions.
Third, ion pair fixation - The gold cyanide complex forms an electrically neutral ion pair with cations, which is firmly adsorbed on the inner surface of the micropores.
These three mechanisms work together, increasing the gold adsorption capacity of 1000 Iodine Value Coconut Shell Carbon for Gold Recovery by more than 30% compared to ordinary carbon.

Core Technical Indicators

Parameter	Index
Iodine Adsorption Value	≥1000 mg/g
Strength	≥97%
Moisture Content	≤10%
Apparent Density	0.45~0.55g/ml

Optimization Parameters for the Activated Carbon Gold Recovery Process

This table summarizes the optimized process parameters for gold recovery using activated carbon. It aims to enhance gold adsorption efficiency, reduce production costs, and ensure stable production operations, and is applicable to the mainstream industrial gold recovery processes: the Carbon-in-Pulp (CIP) and Carbon-in-Leach (CIL) methods.

Process Stage	Parameter Name	Optimized Range	Optimization Objective	Application Notes
Pre-treatment & Cyanidation (Pre-stage of Gold Dissolution)	Slurry pH Value	9.0 – 12.0	Prevent volatilization of hydrogen cyanide (HCN), ensure complete gold dissolution, and provide a suitable environment for activated carbon adsorption	Adjust with lime (CaO) or sodium hydroxide (NaOH); monitor pH regularly to avoid excessive alkalinity (pH > 12) which inhibits adsorption
	Cyanide Concentration (NaCN/KCN)	0.02% – 0.05% (mass fraction)	Provide sufficient cyanide ions to form stable [Au(CN)₂]⁻ complex ions and reduce cyanide consumption	Control concentration based on ore grade; excessive cyanide increases cost and environmental pressure, while insufficient amount weakens gold dissolution
	Slurry Temperature	20℃ – 35℃	Accelerate gold cyanidation reaction and balance reaction rate with energy consumption	Avoid temperatures above 40℃, which accelerate cyanide decomposition and reduce gold leaching efficiency
	Slurry Oxygen Content	≥ 8 mg/L	Supply necessary oxygen for gold cyanidation (oxidation process of gold)	Aerate with aeration equipment; ensure uniform oxygen distribution to avoid local oxygen deficiency
Activated Carbon Adsorption (Core Stage)	Activated Carbon Dosage	10 – 30 g/L (slurry)	Maximize gold adsorption capacity and minimize residual gold concentration in solution	Adjust based on slurry gold concentration; coconut shell activated carbon is recommended for superior adsorption performance
	Activated Carbon Particle Size	1.0 – 3.0 mm (8 – 16 mesh)	Balance adsorption rate and filtration performance, ensuring full contact between carbon and slurry	Avoid overly fine carbon (easy loss) or overly coarse carbon (reduced surface area and adsorption efficiency)
	Adsorption Time	4 – 8 hours	Ensure full adsorption of [Au(CN)₂]⁻ onto activated carbon to reach equilibrium	Adjust according to the number of adsorption tanks in CIP/CIL systems; maintain stable and continuous adsorption
	Slurry Solids Content	30% – 45% (volume fraction)	Ensure sufficient contact between activated carbon and gold cyanide complexes while maintaining good slurry fluidity	Excessively high solids impair circulation and carbon dispersion; excessively low content reduces production efficiency
	Ionic Strength (Ca²⁺/Na⁺ Concentration)	0.05 – 0.2 mol/L	Promote formation of neutral ion pairs (e.g., Ca[Au(CN)₂]₂) and enhance physical adsorption	Calcium ions can be supplemented with lime, which also helps regulate slurry pH
Post-treatment (Gold Recovery Stage)	Electrolytic Current Density	10 – 20 A/m²	Achieve effective gold deposition from desorption solution and improve gold recovery rate	Adjust current density based on gold concentration in desorption solution; ensure stable electrolysis

Note: The above parameters are derived from optimizations based on industrial practice and may be adjusted according to specific ore properties (gold grade, ore type), activated carbon specifications, and production equipment conditions. For personalized parameter optimization, please contact our technical support team.

Authoritative Certification and Customer Cases

Huajing has long been deeply cooperating with top domestic mining groups such as China International Resources Group, Shandong Gold Group, Zhaoguang Group, and Zijin Mining. With stable product quality and professional services, it has become the preferred partner of many leading enterprises in the industry.
The company has strong production capabilities. Currently, it has 12 integrated gasification and activation furnaces, 10 gasification furnaces, 6 converters, and 2 Slipper furnaces. The annual production capacity of activated carbon reaches 40,000 tons, which can fully meet the large-scale procurement needs of various industries.
The company has outstanding scientific research and innovation capabilities. It has established 3 academies of engineers (based on Nanjing Forestry University, Shenyang Agricultural University, and the Chinese Academy of Forestry), and set up 2 provincial-level and above scientific research centers. It has cumulatively obtained more than 30 national patents, and its technical strength is at the leading level in the industry.
Thanks to its outstanding technical achievements and industry contributions, the company has successively won first prizes of the Liangxi Forestry Science and Technology Award, the National Science and Technology Progress Award, and other national and industry-level honors, demonstrating the brand's authority and professional strength.

FAQ

1. How to select the 1000 Iodine Value Coconut Shell Carbon for Gold Recovery in the CIL and CIP processes?
A: In the CIL process, the activated carbon is directly added to the leaching tank and the leaching and adsorption occur simultaneously; in the CIP process, the carbon adsorption is carried out separately after the cyanide leaching is completed. Regardless of which process, the high strength (≥98%) of Huajing 1000 iodine value carbon ensures that it is not easily broken under intense stirring, reducing carbon loss.

2. How does the 2100 iodine value carbon perform in CIL/CIP processes for gold mines?
A: Huajing 1000 iodine value carbon is suitable for high-concentration mine slurries and environments with complex impurities. It has a large adsorption capacity and a fast gold recovery rate, simultaneously meeting the process requirements of CIL's simultaneous leaching and CIP's subsequent efficient adsorption, and steadily improving the gold recovery rate.

3. Why is 1000 iodine value activated carbon preferred for gold extraction from gold mines?
A: The 1000 iodine value falls within the efficient adsorption range for gold extraction, taking into account both gold loading capacity and desorption performance. Combined with high-strength activated carbon, it is resistant to wear and has low powdering, which can significantly reduce carbon consumption and production costs.