Scale-Inhibiting Polymers for Cyanide Leaching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Scale or mineral deposit formation is a common problem in mining processes, particularly in gold and silver extraction methods like heap leaching and vat leaching, where alkaline cyanide solutions are used, leading to inefficiencies and equipment damage due to the formation of insoluble salts like calcium carbonate.
Innovation Solution
The use of scale-inhibiting polymers comprising sulfonate-containing monomers such as 2-sulfoethyl methacrylate and maleic acid, either as copolymers or terpolymers, added to aqueous alkali cyanide solutions to prevent scale formation by interfering with crystal nucleation and growth, thereby reducing mineral deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If alkaline cyanide solutions are used for gold extraction, then metal dissolution efficiency is improved, but scale formation increases
Solution Approach 1:
A scale-inhibiting polymer is introduced as an intermediary substance between the alkaline cyanide solution and the metal ions. The polymer contains sulfonate-containing monomer units and maleic acid units that interact with calcium and other metal ions to prevent scale formation while allowing gold dissolution to proceed efficiently
Solution Approach 2:
The invention changes the chemical parameters of the leaching solution by adding specific polymers with controlled molecular weights (1,000-30,000 Daltons) and specific monomer compositions. This modification allows the solution to maintain its gold-dissolving capability while gaining scale-inhibiting properties
2Reliability
If polymer concentration is increased to improve scale inhibition, then scale formation is reduced, but solution viscosity increases
Solution Approach 1:
The invention optimizes the polymer concentration parameter to achieve effective scale inhibition at low dosages. By selecting polymers with specific molecular weights (1,000-30,000 Daltons) and optimizing concentration, the solution maintains low viscosity while achieving reliable scale inhibition
Solution Approach 2:
The scale-inhibiting polymer is designed as a composite structure containing both sulfonate-containing monomer units (for metal ion interaction) and maleic acid units (for structural stability). This composite structure achieves high scale inhibition efficacy at low concentrations without excessive viscosity increase
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 described method effectively inhibits scale formation, as demonstrated by significant reductions in calcium carbonate deposition, maintaining system efficiency and preventing equipment damage, with the polymers showing high efficacy even at low dosages.
Implementation Method 1
The use of scale-inhibiting polymers comprising sulfonate-containing monomers such as 2-sulfoethyl methacrylate and maleic acid, either as copolymers or terpolymers, added to aqueous alkali cyanide solutions to prevent scale formation by interfering with crystal nucleation and growth
Implementation Method 2
The use of scale-inhibiting polymers comprising sulfonate-containing monomers such as 2-sulfoethyl methacrylate and maleic acid, either as copolymers or terpolymers, added to aqueous alkali cyanide solutions to prevent scale formation by interfering with crystal nucleation and growth
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Scale-inhibiting polymers, compositions comprising the scale-inhibiting polymers and methods for preventing scale formation in circulating fluid are provided. The scale- inhibiting polymers comprise two or more recurring units wherein at least one recurring unit is a sulfonate-containing monomer and at least one recurring unit is selected from the group consisting of maleic acid, itaconic acid, acrylamide, acrylic acid, methacrylic acid, polyethylene glycol monomethacrylate, maleic anhydride, t-butyl acrylamide, hydroxy propyl acrylate, hydroxy ethyl methacrylate, hydroxy propyl methacrylate, and vinyl phosphonic acid. The polymers, compositions and methods may be used in mining processes including metal extraction from mineral ores.