Aqueous Dust Control Compositions Suppressing Fugitive Emissions
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Solution Overview
Problem
Current dust control methods, such as using oils, provide transient solutions and can contaminate water sources, while failing to effectively reduce fugitive dust emissions from particulate substrates like silica sand during transportation and handling, posing health and environmental risks.
Innovation Solution
Aqueous compositions comprising surface modifying agents like ammonium compounds, urea, and glycine, along with dispersants like glycol ethers, are applied to particulate substrates to reduce dust release without altering the intergranular friction coefficient, thus providing extended dust control without the drawbacks of oil-based solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If oil is applied as a dust suppressant, then dust suppression ability is improved, but the control measure becomes transient and water contamination occurs
Solution Approach 1:
The invention changes the chemical composition parameters by replacing oil-based suppressants with aqueous solutions containing specific concentrations of calcium salts (5-50% w/w), lignosulfonates (1-20% w/w), and other additives. This parameter change transforms the dust control mechanism from oil coating to a combination of particle binding and moisture retention, achieving both effective dust suppression and extended duration without water contamination
Solution Approach 2:
The invention uses composite dust control compositions combining multiple ingredients: calcium salts (chloride, nitrate, sulfate), lignosulfonates, vegetable oils (5-30% w/w), petrochemical oils (5-30% w/w), and other additives. This composite approach synergistically combines particle binding, moisture retention, and dust suppression mechanisms to overcome the transient nature of single-component oil applications while avoiding water contamination
2Object-affected harmful factors
If oil is applied as a dust suppressant, then dust suppression ability is improved, but water contamination occurs
Solution Approach 1:
The invention extracts and eliminates the harmful component (pure oil) from the dust control system, replacing it with an aqueous-based composition. By taking out the oil-only approach and substituting it with a multi-component solution containing calcium salts, lignosulfonates, and controlled amounts of oil (5-30% w/w), the system achieves dust suppression without the severe water contamination problems of pure oil application
Solution Approach 2:
The invention introduces intermediary substances (calcium salts, lignosulfonates, and other additives) that mediate between the dust particles and the aqueous medium. These intermediaries bind to dust particles and create a stable suspension that suppresses dust emissions without the hydrophobic properties of pure oil that cause water contamination
3Object-affected harmful factors
If water is sprayed on dust, then dust suppression is achieved, but the control measure is transient
Solution Approach 1:
The invention enhances simple water spraying by creating a composite aqueous composition containing calcium salts (5-50% w/w), lignosulfonates (1-20% w/w), vegetable oils (5-30% w/w), and other additives. This composite formulation provides prolonged dust control through multiple mechanisms: particle binding by calcium salts, moisture retention by lignosulfonates, and extended suppression duration by the controlled oil content, far exceeding the transient effect of pure water spraying
Solution Approach 2:
The aqueous composition serves multiple functions simultaneously: calcium salts bind dust particles, lignosulfonates retain moisture and extend control duration, vegetable oils provide additional suppression, and the aqueous base enables easy application. This multi-functionality transforms the transient water spray into a prolonged, multi-mechanism dust control system
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 compositions effectively suppress fugitive dust emissions from various substrates, including silica sand, during handling and transportation, maintaining effectiveness over extended periods without altering the friction properties of the substrates, thus reducing health and environmental risks and offering a lower-cost alternative to existing solutions.
Implementation Method 1
The compositions may be applied to road surfaces, blasting sand, sand used for hydraulic fracturing (fracing), or mining sediments/tailings
Implementation Method 2
Oil suppresses dust by coating the dust particles and sticking the dust particles to each other and to an underlying substrate such as an unpaved road
Data Source
AI summary
Compositions and methods of reducing release of fugitive dust from particulate substrates are provided. The method involves applying a composition onto the substrate in an amount effective to reduce dust release and remain effective for an extended period of time, wherein the composition comprises an aqueous medium, a surface modifying agent, and a dispersant.