Washable Mining Grouting Material for Coal Quality
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Deep coal mining faces challenges with frequent roof caving and spalling disasters due to fragmented geological conditions, where existing grouting reinforcement materials, like silicate modified polyurethane, are difficult to wash out, increasing ash content in clean coal and reducing its quality.
Innovation Solution
A mining grouting reinforcement material composed of a sodium silicate solution and an amino acid salt, combined with an isocyanate, plasticizer, filler, and molecular bridging agent, which increases specific gravity while maintaining stability and mechanical strength, allowing efficient washing and selection without affecting coal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicate modified polyurethane grouting material is used for roof reinforcement, then reinforcement effect and safety are improved, but washout rate decreases and ash content of clean coal increases
Solution Approach 1:
The patent changes the specific gravity parameter of the grouting material by adding fillers (barite powder, magnetite powder, or steel dust) to make the material denser than coal. This allows the reinforcement material to be effectively separated from clean coal during washing processes through gravity-based separation, resolving the contradiction between maintaining reinforcement effectiveness and reducing ash content in clean coal
Solution Approach 2:
The patent creates a composite grouting material combining silicate modified polyurethane with high-specific-gravity fillers. This composite structure maintains the reinforcement properties of the polyurethane while adding the density needed for effective washout, simultaneously achieving both reinforcement effect and clean coal quality
2Loss of substance
If filler with high specific gravity is added to increase washout rate, then washability is improved, but mechanical strength may decrease
Solution Approach 1:
The patent applies local quality by strategically selecting filler types (barite powder, magnetite powder, or steel dust) with specific gravity of 2-8 that provide both sufficient density for washout and adequate structural support. The filler is distributed within the polyurethane matrix to locally enhance density while maintaining overall mechanical integrity
Solution Approach 2:
The patent optimizes the specific gravity parameter of the filler to a range of 2-8, which is high enough to enable effective gravity-based separation during washing but not so high that it compromises the mechanical strength of the grouting material. This parameter optimization resolves the contradiction between washability and strength
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 material achieves a washout rate of over 99% with no adverse impact on coal quality, providing high mechanical strength and flame retardancy, reducing reaction temperature, and improving safety in coal mines.
Implementation Method 1
The amino acid salt includes at least one of amino acid salts containing all groups —COOH, —NH2 and —COOR, where R is a metal ion
Implementation Method 2
the molecular bridging agent and the admixture are mixed uniformly under a condition of sealing and first stirring to obtain a first mixture
Implementation Method 3
a polymer chain formed after the polymerization of organic components (that is, carbamate or substituted urea generated by the reaction of an isocyanate with water in a silicate solution)
Implementation Method 4
A silicate modified polyurethane material overcomes shortcomings of a polyurethane material and has outstanding advantages of low cost and high safety
Data Source
AI summary
A mining grouting reinforcement material is provided and includes a component A including a sodium silicate solution and an amino acid salt, and a component B including an isocyanate, a plasticizer, a filler and a molecular bridging agent. A specific gravity of the filler is 2 to 8.