Clay Stabilizing Polymer Heap Leaching Process
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Solution Overview
Problem
The heap leaching process for metal extraction from clay-containing ores is hindered by clay swelling, which reduces leaching productivity due to blocked flow paths and reduced percolation rates of the leaching solution.
Innovation Solution
Incorporating a cyanide-based leach solution with a wetting agent and a clay stabilizing polymer, such as polyalkylene oxide copolymers or polyamine copolymers, to stabilize clay particles and maintain flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional heap leaching is used on clay-containing ores, then metal extraction can proceed, but clay swelling blocks flow paths and reduces leaching productivity
Solution Approach 1:
A surfactant is introduced as an intermediary substance between the leach solution and clay particles. The surfactant adsorbs onto the clay particle surfaces, forming a protective layer that prevents clay swelling and maintains flow paths open, thereby eliminating the harmful effect of clay expansion without altering the fundamental heap leaching process
Solution Approach 2:
The chemical composition of the leach solution is modified by adding surfactants. This parameter change alters the surface properties of clay particles through surfactant adsorption, preventing clay-water interaction that causes swelling, and thereby maintains solution flowability and leaching productivity throughout the heap
2Speed
If clay is present in the ore, then metal extraction can proceed, but clay particles break down and block flow paths reducing percolation rates
Solution Approach 1:
The surfactant acts as a mediator that coats clay particles, preventing their breakdown during the leaching process. This protective surfactant layer maintains particle integrity and prevents the generation of fine clay particles that would otherwise block flow paths and reduce percolation rates
Solution Approach 2:
The surfactant is added to the leach solution before it contacts the clay-containing ore. This preliminary action ensures that surfactant molecules are already positioned to adsorb onto clay particle surfaces upon contact, preventing clay breakdown before it can occur and maintain high percolation rates throughout the leaching operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances metal extraction efficiency by preventing clay particle breakdown and maintaining flow rates, thereby increasing the recovery of precious metals without altering the extraction process or bed.
Implementation Method 1
a wetting agent; and a clay stabilizing polymer
Implementation Method 2
a clay stabilizing polymer, such as polyalkylene oxide copolymers or polyamine copolymers, to stabilize clay particles
Implementation Method 3
gold ions are solubilized by forming complex ions with cyanide: Au1+(s)+2CN−(aq)→Au(CN)2−(aq)
Implementation Method 4
2Au+4CN−+O2+2H2O→2Au(CN)2−+2OH−+H2O2 (1) 2Au+4CN−+H2O2→2Au(CN)2−+2OH− (2)
Data Source
AI summary
A solution for leaching metals from clay containing ore and a method of leaching ore is described. The solution comprises a cyanide; a wetting agent; and a clay stabilizing polymer.