Superabsorbent Polymer Stabilization of Ore Tailings
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Solution Overview
Problem
The challenge in storing tailings in above-ground residue storage facilities is the low initial strength of tailings, leading to inefficient use of space and instability, as they tend to flow away, and existing thickening methods are complex, costly, and energetically unfavorable.
Innovation Solution
The use of superabsorbents to treat water-containing ore processing residues, increasing the complex shear modulus and maximum load, thereby stabilizing the tailings and improving their storage and transport properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If thickening processes are used to convert free-flowing tailings into less fluid mass, then stability is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the chemical composition parameter by introducing superabsorbent polymers with specific functional groups that can absorb water and bind tailings particles, transforming the physical state from free-flowing to stable without complex equipment
Solution Approach 2:
Superabsorbent polymers act as intermediary substances that mediate between water and tailings particles, absorbing water and creating binding bridges between particles to achieve stability without mechanical complexification
2Stability of the object's composition
If thermal processes are used to process tailings, then stability is improved, but energy consumption increases
Solution Approach 1:
The patent replaces thermal energy input with chemical interaction between superabsorbent polymers and water, using polymer-water-tailings complexation instead of heat to achieve stabilization
Solution Approach 2:
The invention changes the approach from thermal parameter modification to chemical composition modification, using polymer addition to alter the physical-chemical properties of tailings without energy-intensive heating
3Object-generated harmful factors
If dams are used to contain tailings, then flow prevention is achieved, but reliability decreases due to breaching risk
Solution Approach 1:
The patent converts the harmful free-flowing nature of tailings into a beneficial stable structure by using superabsorbent polymers to create self-containing gel-like masses that inherently resist flow without external containment structures
Solution Approach 2:
Superabsorbent polymers serve as intermediary agents that create internal binding structures within tailings, acting as a self-contained stabilization mechanism that eliminates reliance on external dams
4Stability of the object's composition
If calcium silicate mixtures or clays are used as aggregates, then thickening is achieved, but mass increases and crust formation occurs
Solution Approach 1:
The patent changes from using inert aggregate materials to using functional superabsorbent polymers that provide stabilization through water absorption and polymer-tailings interaction rather than through mass addition
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 treatment with superabsorbents enhances the stability and storage efficiency of tailings, reducing flowability, improving drying behavior, and allowing for higher stackability, while also reducing the risk of erosion and environmental contamination.
Implementation Method 1
The use of superabsorbents for the treatment of water-containing ore processing residues to increase the complex shear modulus G*
Implementation Method 2
wherein the superabsorbent is in polymerized form a) at least 50 mol% based on the superabsorbent of one or more monoethylene unsaturated monomers containing acid groups, wherein the degree of neutralization of the monoethylene unsaturated monomers containing acid groups is preferably 15 to 85 mol%, and b) preferably 0.015 to 0.1 mol% based on the total amount of monomers of at least one crosslinking agent
Data Source
AI summary
A method for treating water-containing ore processing residues with a superabsorbent to increase the complex shear modulus G* by at least 10% compared to the untreated ore processing residue, wherein the complex shear modulus G* is determined according to the method defined herein, and wherein the superabsorbent in polymerized form contains a) at least 50 mol% based on the superabsorbent of one or more monoethylene unsaturated monomers containing acid groups, wherein the degree of neutralization of the monoethylene unsaturated monomers containing acid groups is preferably 15 to 85 mol%, and b) 0.015 to 0.1 mol% based on the total amount of monomers of at least one crosslinker, and c) optionally one or more ethylene and/or allylic unsaturated monomers that are different from the monomers a) and are copolymerizable with them, wherein the superabsorbent is optionally surface-treated.preferably using anti-caking agents and/or flow aids, and preferably surface-crosslinked.