Normal Temperature & Pressure
Desorption Electrolysis Unit
This high-efficiency, safe, and eco-friendly normal-temperature and pressure desorption electrolysis unit is designed specifically for gold carbon-in-leach/carbon-in-pulp plants and heap leaching plants, enabling efficient desorption and electrolytic recovery of gold from gold-loaded carbon.
Advanced Gold Extraction & Refining equipment - Adsorption Electrolysis System
- Type: 300KG/Batch; 500KG/Batch capacity (Scalable up to 1000kg)
- Desorption rate: > 96%
- Electrolysis rate: > 99% (Industry-leading)
- Operating conditions: Ambient temperature and pressure, 95鈩, 0.2Mpa
- Desorption time: 44 hours (starting from 95鈩)
- Desorption solution concentration: NaCN 2%, NaOH 1%
- Finished product purity: 99.99%
- Suitable for: small-to-medium-sized gold mines and heap leaching plants.
Key highlights:聽 The normal temperature and pressure adsorption electrolysis system utilizes a closed-loop design, enabling the reuse of the desorption solution. Balancing environmental sustainability with economic efficiency, it serves as the core process linking gold-loaded carbon adsorption with gold ingot smelting.
- Low equipment investment cost.
- Activated carbon loss rate < 2%.
- Supports fully automated PLC control.
- Easy-to-master process.
What Is Normal Temperature Desorption Electrolysis Unit
Normal temperature & pressure (NTP) desorption electrolysis unit, also known as an atmospheric gold elution and electrolysis system or conventional temperature and pressure gold stripping equipment. The integrated unit is gold extraction equipment that desorbs and electrolyzes gold at ambient temperature and pressure. Operating at near-standard temperatures (95掳C) and atmospheric pressure (鈮0.2 MPa) using an aqueous mixture of NaOH and NaCN as the eluent, the system integrates the core processes of desorption and electrowinning to strip gold cyanide complexes from loaded carbon and recover metallic gold, ultimately producing high-grade gold sludge suitable for smelting. Widely utilized in CIL/CIP (Carbon-in-Leach/Carbon-in-Pulp) plants and heap leaching facilities at gold mines processing 10 to 1,000 tonnes of ore per day (TPD) worldwide, this system serves as a critical link in the gold cyanidation extraction process.
Applicable Scenarios:
- CIL/CIP Plants: In Carbon-in-Leach (CIL) or Carbon-in-Pulp (CIP) processes, gold-loaded carbon (after gold adsorption) requires a desorption-electrolysis system to extract the gold; this is a standard process step for producing gold sludge in such plants.
- Heap Leaching Operations: Recovery of low-grade gold-loaded carbon from heap leaching processes; the ambient temperature and pressure equipment offers high cost-effectiveness, aligning perfectly with the low-cost operational model of heap leaching.
- Gold Tailings Retreatment: Secondary recovery of gold from gold-loaded carbon generated during the cyanidation-adsorption treatment of tailings, thereby improving the comprehensive utilization rate of resources.
- Comprehensive Recovery from Polymetallic Ores: Processing gold-loaded carbon containing gold, silver, and other metals, allowing for the simultaneous recovery of these valuable metals during electrolysis.
- Gold Concentrate Cyanidation Workshops: Desorption treatment of gold-loaded carbon generated after the cyanidation-adsorption of flotation gold concentrates.
- Mine Laboratories/Pilot Plants: Used for process validation, parameter optimization, and ore amenability assessment involving small batches of gold-loaded carbon.
- Activated Carbon Regeneration Support: Barren carbon (post-desorption) can be regenerated and immediately returned to the adsorption circuit, reducing activated carbon procurement costs and establishing a complete “adsorption鈥揹esorption鈥搑egeneration” closed-loop system.
Key Equipment and Functions Of 300KG/ 500KG Capacity Desorption Electrolysis Unit
鈿 1. Electrolytic Tank (1 Set)
Constructed from specialized corrosion-resistant materials and containing internal anode and cathode plates, it serves as the core area for electrolytic gold deposition and recovery.
馃洟锔 2. Desorption Column (1Set)
The vertical pressure vessel contains gold-loaded carbon; as the desorption solution flows through the carbon bed, it displaces the gold-cyanide complexes, thereby completing the gold desorption process.
馃攳 3. Filter (2Set)
Installed between the desorption column outlet and the electrolytic cell, it prevents carbon fines and impurity particles in the filtered pregnant solution from entering the cell and impairing electrolysis efficiency.
馃敟 4. Electric Heater (2Set)
Heat the desorption solution to the operating temperature (95掳C) to provide the thermal energy required for the desorption reaction.
馃И 5. Desorption Solution Tank (1Set)
Store the prepared desorption solution (NaOH + NaCN solution) to provide a stable supply for the desorption cycle.
馃彈锔 6. Carbon Storage Tank (1Set)
Temporarily store loaded carbon awaiting processing and barren carbon after desorption to facilitate material transfer.
馃攧 7. Heat Exchanger (1Set)
Cools the hot pregnant solution from ~95掳C to ~80掳C before it enters the electrolytic tank for optimal electrolysis.
馃挧 8. Liquid Storage Tank (1Set)
Stores clean water, waste liquid, or standby reagents for circulation and reuse across various stages of the process.
猬嗭笍 9. Carbon Storage Tank (2Set)
A specialized wear-resistant pump is used to hydraulically transport activated carbon into and out of the desorption column.
Structural & Principle Of Normal Temperature Desorption Electrolysis Unit
Working principle
Its core principle can be summarized as “anion displacement desorption + electrolytic deposition recovery,” consisting of three closely linked processes:
1. Desorption Process: The gold-loaded carbon, after being acid-washed to remove impurities, is loaded into the desorption column, and the prepared desorption solution (1%~2% NaOH + 1%~2% NaCN aqueous solution) is injected. An electric heater raises the solution temperature to 95掳C, and a circulation pump drives the solution to flow continuously through the bed of gold-loaded carbon in a closed-loop system. CN鈦 and OH鈦 ions in the solution displace the [Au(CN)鈧傗伝] ions adsorbed on the activated carbon surface, causing the gold to desorb from the carbon micropores into the liquid phase and forming a gold-rich solution.
2. Electrolysis process: After the precious solution is filtered to remove carbon powder, it enters the electrolytic cell. Under the action of DC electric field, the gold cyanide complex gains electrons on the cathode surface and is reduced to metallic gold and deposited to form gold mud.
3. Recycling and regeneration: The lean solution after electrolysis is returned to the system for recycling, and the activated carbon can be regenerated and adsorbed again. Once the gold sludge accumulates to a certain thickness, it is removed; subsequent acid washing and smelting yield the final gold ingots.
why choose JXSC Normal Temperature Desorption Electrolysis Unit
features & Advantages
鈭 Low initial investment: No need for high-pressure vessels or specialized sealing systems; equipment manufacturing costs are only 40%鈥50% of high-temperature, high-pressure alternatives, resulting in a lower financial barrier to entry.
鈭 Low operational barrier: Operates at atmospheric pressure with no high-pressure risks; general mineral processing personnel can operate the system independently after just 3鈥5 days of training, without requiring special certification.
鈭 Minimal safety risk: System pressure is close to atmospheric pressure, eliminating the risk of pressure vessel explosions and avoiding the need for annual inspections or regulatory filings associated with special equipment.
鈭High maturity: Features advanced electrolysis technology, a wide control window for process parameters, stable and reliable system operation, and a low failure rate.
鈭 Easy maintenance and repair: Atmospheric pressure vessels feature a simple structure, allowing maintenance to be performed without specialized operational qualifications.
鈭 High spare part compatibility: Pumps, valves, instruments, and electrical components are standard parts, ensuring broad procurement channels and transparent pricing.
鈭 Energy-efficient: Waste heat is recovered via heat exchangers, and electric heating power requirements are moderate; energy consumption per tonne of carbon processed is lower than in high-pressure systems, keeping operating costs under control.
鈭 Strong adaptability to carbon types: Capable of processing gold-loaded carbon from various sources and grades; fluctuations in particle size or grade do not affect normal operation.
鈭 Good environmental compliance: A closed-loop circulation system reduces waste liquid discharge and allows for the reuse of desorption solutions, meeting environmental management requirements for gold mines.
鈭 Modular and scalable: Desorption columns, electrolytic cells, and other units can be added incrementally based on production capacity needs, allowing for phased investment.
models & specifications
Basic Parameters:
| Parameter | 300KG/Batch | 500KG/Batch |
|---|---|---|
| Operating Conditions | Normal temperature & pressure, 95鈩, 0.2Mpa | Normal temperature & pressure, 95鈩, 0.2Mpa |
| Processing Time | 40 鈥 48 hours | 40 鈥 48 hours |
| Total Power | 30KW | 45KW |
| Desorption Rate | > 96% | > 96% |
| Electrolysis Rate | > 99% | > 99% |
| Electrolysis Voltage | 1.5 鈥 3V DC | 1.5 鈥 3V DC |
| Electrolysis Current | 200A | 320A |
| Capacity | 300kg/batch | 500kg/batch |
| Equipment Weight | 2.5 tons | 鈥 |
| Equipment Dimensions | 4120 脳 2100 脳 4130mm | 鈥 |
| Parameter | 300KG/Batch | 500KG/Batch |
|---|---|---|
| Desorption Time | 44 hours (from reaching 95鈩) | 44 hours (from reaching 95鈩) |
| Desorption Solution Concentration | NaCN 2%, NaOH 1% | NaCN 鈮 2%, NaOH 鈮 1% |
| Desorption Temperature | 95鈩 (measured at desorption column outlet) | 95鈩 |
| Desorption Voltage | 1.5 鈥 3V DC | 1.5 鈥 3V DC |
| Electrolysis Current | 200A | 320A |
| Electrolyte Flow Rate | 1.5 T/h | 3.6 t/h |
| Desorption Solution Addition | NaCN 40kg, NaOH 20kg | Initial addition: NaCN 80kg, NaOH 40kg |
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