CIP Gold Processing Flow Chart – Carbon in Pulp Process

From Raw Ore to Gold Bullion: A Complete Guide to the CIP (Carbon in Pulp) Extraction Method

1. Overview of the CIP Process

The Carbon in Pulp (CIP) process is a proven metallurgical technique for recovering gold from finely disseminated ores. Unlike traditional methods that require solid-liquid separation before gold recovery, CIP directly adsorbs dissolved gold onto activated carbon from the pulp. This significantly simplifies the workflow and improves recovery efficiency.

This article breaks down the standard CIP flow chart step by step, covering every major component from crushing to smelting and tailings management.

2. Key Equipment in the CIP Flow Chart

The following major equipment appears in the typical CIP process diagram:

3. Detailed Process Description

3.1 Crushing Section

Raw ore is first fed into a Jaw Crusher for primary crushing, reducing large rocks to a manageable size. The coarse product then enters a Cone Crusher for secondary and fine crushing, producing fine ore suitable for grinding.

✅ Purpose: Liberate gold particles and reduce ore size for efficient grinding.

3.2 Grinding and Classification

The fine ore is sent to a Ball Mill for wet grinding. The mill discharge passes through a Spiral Classifier, which separates qualified fine pulp from oversized material. Coarse particles are returned to the ball mill for further grinding, forming a closed circuit.

✅ Purpose: Achieve optimal particle size for gold liberation and subsequent leaching.

3.3 Thickening and Water Recycling

Qualified pulp enters a Thickener to increase solid concentration (typically 40-45%). Overflow water, known as backwater, is returned to the front of the process for reuse, reducing both water consumption and cyanide loss.

✅ Purpose: Concentrate pulp and recover process water.

3.4 Pre-Leaching

Underflow from the thickener flows into the Pre-leach Tank, where cyanide and other reagents are added. Gold dissolves from solid particles into the solution, forming a gold-cyanide complex.

✅ Purpose: Dissolve gold into solution for subsequent adsorption.

3.5 Adsorption Section (Core of CIP)

The pulp then passes through multiple Adsorption Tanks (labeled 1, 2, and 3 in the diagram). Each tank contains activated carbon, which strongly adsorbs the gold-cyanide complex.

In industrial practice, carbon is moved counter-current to pulp flow (e.g., fresh carbon meets pulp with the highest gold concentration), maximizing loading efficiency.

✅ Purpose: Transfer dissolved gold from solution onto activated carbon.

3.6 Loaded Carbon Separation and Smelting

After the final adsorption tank, the pulp passes through a Safety Screen, which separates gold-loaded carbon from tailing pulp.

Loaded carbon is sent to smelting, where it is acid-washed, stripped, electrowon, or directly melted to produce high-purity gold bullion (GOLD9999).

Tailings pulp goes to a Pressure Filter for solid-liquid separation.

3.7 Tailings and Backwater Recycling

The pressure filter produces:

Filter cake: Disposed as dry tailings or stored in a tailings pond.

Filtered water: Returned as backwater to the thickening and leaching circuits, completing the water closure loop.

✅ Purpose: Minimize environmental impact and reagent loss.

4. Advantages of the CIP Process

5. Typical Operating Parameters

6. Conclusion

The Carbon in Pulp (CIP) process remains one of the most efficient and environmentally sound methods for gold extraction from low-grade and fine-disseminated ores. From primary crushing through multiple adsorption tanks to final smelting, the flow chart illustrates a rational, closed-loop system that maximizes gold recovery while minimizing waste.

Whether you are a mining engineer, plant operator, or investor, understanding the CIP flow chart is essential for optimizing gold processing operations. The integration of backwater recycling, safety screening, and modular adsorption tanks makes CIP a robust choice for modern gold mines worldwide.

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Huatao Group

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