The demand from the industry over the years has been for special graphite and carbon with increasingly tighter
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Gravity vs. CIP: Which Saves More Costs in Tanzania’s 150 tons per day Gold Projects?
When comparing gravity separation and the Carbon-in-Pulp (CIP) process for gold recovery in a 150 tons per day (TPD) gold project in Tanzania, the choice of method should be based on various factors, including ore characteristics, capital cost, operational cost, recovery efficiency, and environmental considerations. Here’s a breakdown to assess their cost-saving potential:
Gravity separation involves separating gold particles based on their density, using methods such as jigs, shaking tables, and centrifugal concentrators (e.g., Knelson or Falcon concentrators).
Gravity separation is cost-effective for ores with a high proportion of free-milling gold, offering a potentially lower operating cost. However, if a significant portion of gold is ultra-fine or embedded within sulfides, additional processes will be required.
CIP is a leaching process where cyanide is used to dissolve gold before activated carbon absorbs gold from the pregnant solution for later recovery.
While CIP offers superior recovery rates, the upfront capital and ongoing operating costs are higher. It is more cost-effective in cases where the ore has significant fine or refractory gold content that gravity cannot recover.
Factor | Gravity Separation | CIP |
---|---|---|
Capital Cost | Lower (simple equipment like concentrators and tables) | Higher (tanks, agitators, cyanide circuit) |
Operating Cost | Low (no reagents, low energy) | Higher (reagents, detoxification, power) |
Recovery Rate | Moderate (dependent on ore type; ~50-70%) | High (~90-95%) |
Ore Type Suitability | Free-milling gold, coarse particles | Broad (free-milling, fine gold, refractory ores) |
Environmental Impact | Low (no cyanide or toxic chemicals required) | High (cyanide management required) |
Scalability | Moderate (limited for large-scale operations) | High (handles large tonnage well) |
Ore Type and Grade:
Infrastructure and Logistics:
Environmental and Regulatory Compliance:
Project Lifetime:
A test program (e.g., bulk sample testing) is essential to determine the ore’s amenability to gravity separation or CIP, and this decision should ideally be informed by a technical-economic feasibility study tailored to the specific geology and economics of the Tanzanian project.
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