Carbon In Leach (CIL) and Carbon In Pulp (CIP) are two commonly used methods in the gold extraction process. Although both methods involve the use of activated carbon to adsorb gold, there are significant differences in their operation processes, equipment layout, and application conditions. This article will explore the differences between CIL and CIP, highlighting their respective advantages, disadvantages.

1. Basic Principles

1.1 Carbon In Leach (CIL)

The Carbon In Leach (CIL) process involves adding activated carbon directly into the leaching tanks where both leaching and adsorption occur simultaneously. The CIL process includes the following steps:

• Crushing and grinding the gold ore into a pulp.

• Mixing the pulp with sodium cyanide solution to dissolve the gold into a cyanide complex.

• Adding activated carbon to the pulp during the leaching process, where the activated carbon adsorbs the dissolved gold.

• After leaching and adsorption, the pulp undergoes solid-liquid separation to recover the gold-laden activated carbon.

• The gold-laden activated carbon undergoes desorption and electrolysis to recover the gold.

1.2 Carbon In Pulp (CIP)

• The Carbon In Pulp (CIP) process differs primarily in the timing of adding activated carbon. The CIP process includes:

• Crushing and grinding the gold ore into a pulp.

• Mixing the pulp with sodium cyanide solution to dissolve the gold into a cyanide complex.

• After leaching, transferring the pulp to a series of adsorption tanks where activated carbon is sequentially added to adsorb the dissolved gold.

• After adsorption, the pulp undergoes solid-liquid separation to recover the gold-laden activated carbon.

• The gold-laden activated carbon undergoes desorption and electrolysis to recover the gold.

2. Main Differences

2.1 Process Differences

Simultaneous Leaching and Adsorption: In CIL, leaching and adsorption occur simultaneously in the same step, whereas in CIP, leaching occurs first, followed by adsorption.

Process Complexity: CIP has a relatively simpler process because leaching and adsorption are separate steps. CIL requires more precise control of process parameters as leaching and adsorption occur concurrently, making it more complex to operate.

2.2 Equipment Configuration

CIL: Since leaching and adsorption occur in the same tank, CIL requires fewer tanks, but each tank is larger and more complex in design.

CIP: CIP requires separate leaching and adsorption tanks. Although there are more tanks, each tank is simpler in design and offers greater operational flexibility.

2.3 Gold Ore Characteristics

Ore Type Suitability: CIL is more suitable for low-grade, high-clay-content ores as these ores can clog the leaching tanks during processing. CIL’s design can better handle this issue. CIP is more suitable for high-grade, uniformly sized ores.

Pulp Handling Capacity: CIL requires stricter control over pulp concentration and particle size, while CIP is relatively more forgiving.

3. Advantages and Disadvantages

3.1 CIL Advantages and Disadvantages

Advantages:

Simultaneous leaching and adsorption result in a shorter process with faster reaction times.

Better suited for high-clay-content ores.

Disadvantages:

Requires precise control of leaching and adsorption process parameters, making it complex to operate.

Higher initial investment due to more demanding equipment and process design.

3.2 CIP Advantages and Disadvantages

Advantages:

Simple process with high operational flexibility.

Adsorption tanks can be used in series, improving adsorption efficiency.

Suitable for high-grade gold ores with simpler process control.

Disadvantages:

Requires separate leaching and adsorption tanks, occupying more space.

Less effective for high-clay-content ores.

The determination of the gold ore extraction process requires strict extraction tests and is determined by professionals. If you have any gold ore extraction needs, please leave a message below， one engineer from our team will contact you shortly.

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MiningWorld Russia is an internationally recognized exhibition dedicated to the mining and extractive industries. As a business platform, the exhibition brings together equipment and technology manufacturers with buyers from Russian mining companies, mineral processors and wholesalers interested in purchasing the latest solutions for the mining industry.

Liming will take part in the MiningWorld Russia 2024 exhibition with our newest stone crushers and mills. Welcome to our booth to find out more details!

Date: April 23-25, 2024

Booth No.: C1009

Venue: Crocus Expo IEC, Pavilion 1, Hall 3, Moscow

Recently, it has been reported that Guinea's Simandou iron ore project has successfully secured a $15 billion financing, sparking widespread attention in the global mining industry. As manufacturers of iron ore processing equipment, we are filled with confidence and see tremendous development opportunities in this.

The Simandou iron ore project has long been under the spotlight due to its abundant resource reserves and potential development value. The successful financing of this project will inject new momentum into the mining industry in Guinea and the entire region. As suppliers of processing equipment, we will actively participate, providing high-quality processing equipment and comprehensive technical support to the project.

The arrival of this investment signifies a new round of development opportunities for the iron ore processing industry. We will increase research and development investment, continuously improve the intelligence and automation level of equipment to meet the project's demand for efficient production and energy conservation. Additionally, we will enhance cooperation with the project stakeholders, offering customized solutions to tailor the most suitable production line, maximizing the value of resources.

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[Process introduction] : Gold heap leaching process is to break low-grade gold ore to a certain particle size (or granulation), pile it on a leakproof bottom mat made of asphalt, concrete or plastic materials, spray with low-concentration cyanide, alkaline solution, non-toxic solvent or dilute sulfuric acid and other solutions on the mine heap to dissolve gold, and the gold-containing solution percolates out from the mine heap. Then the gold is recovered by activated carbon adsorption or zinc powder replacement precipitation.

[Application field] : Gold heap leaching is often used to develop small ore bodies or low-grade gold deposits, or both, and cannot be exploited by conventional methods.

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Here are the details of our booth:

Booth Number: Processing machinery and equipment exhibition area, exhibition hall 20.1, booth number K07

Location:  No. 382, Yuejiang Middle Road, Haizhu District, Guangzhou, China

Time :April 15-19, 2024

To ensure that we can provie you with personalized attention during your visit, we encourage you to schedule a meeting with us in advance. Please feel free to contact online help to arrange a convenient time.

We genuinely look forward to welcoming you to our booth and engaging in meaningful discussions that can pave the way for mutually beneficial partnerships and collaborations.We eagerly anticipate the opportunity to connect with you at the Spring Canton Fair.

Warm regards,

Liming Team

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Production capacity: 1200T/H

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