ROC Slag Flushing Treatment Agent for Scale and Corrosion Control
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Solution Overview
Problem
The use of reverse osmosis concentrate (ROC) for slag flushing in yellow phosphorus production leads to severe scaling, corrosion, and blockage issues in the slag flushing system, affecting equipment integrity and production efficiency, due to its high impurity content and harsh chemical properties.
Innovation Solution
A treatment agent comprising polyamino polyether methylene phosphonic acid (PAPEMP) and dendritic polymer poly(amidoamine) (PAMAM) for scale inhibition, 2-hydroxyphosphonoacetic acid (HPAA) for carbon steel corrosion inhibition, 5-butyl-benzotriazole for copper corrosion inhibition, citric acid and formic acid for rust removal, and polyethylene glycol (PEG) for wetting, effectively inhibiting scale formation and corrosion while enhancing rust removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If reverse osmosis concentrate (ROC) is used for slag flushing, then water consumption is reduced and wastewater resource utilization is achieved, but severe scaling, corrosion, and blockage occur in the slag flushing system
Solution Approach 1:
The patent introduces a composite treatment agent as an intermediary substance that mediates between the ROC and the slag flushing system components. This treatment agent includes scale inhibitors (polyamino polyether methylene phosphonic acid, dendritic polymer poly(amidoamine)), corrosion inhibitors (2-hydroxyphosphonoacetic acid, 5-butyl-benzotriazole), and cleaning agents (citric acid, formic acid) that collectively protect the system from scaling, corrosion, and blockage while allowing ROC to be used for water flushing
Solution Approach 2:
The patent changes the chemical parameters of the ROC by adding treatment agents that modify the water's chemical properties. The treatment agent alters the pH, hardness, and chemical composition of the ROC to reduce its harmful effects, enabling it to be used safely in the slag flushing system without causing severe scaling, corrosion, or blockage
2Quantity of substance
If ROC is used as slag flushing water, then fresh water consumption is reduced, but scale formation blocks pipelines and equipment
Solution Approach 1:
The treatment agent acts as a protective intermediary that prevents scale formation on equipment surfaces and in pipelines. The scale inhibitors (polyamino polyether methylene phosphonic acid, dendritic polymer poly(amidoamine)) in the treatment agent bind to calcium and magnesium ions, preventing them from forming scales, while the cleaning agents (citric acid, formic acid) remove existing scale deposits
Solution Approach 2:
The treatment agent extracts and removes harmful scale-forming substances from the ROC through chemical chelation and precipitation processes, separating the harmful scale-forming ions from the water stream so they can be prevented from depositing on equipment surfaces
3Productivity
If ROC is used for slag flushing, then water recycling is improved, but serious corrosion occurs to equipment and rust accumulation increases
Solution Approach 1:
The treatment agent serves as a protective intermediary layer between the corrosive ROC and the equipment surfaces. The corrosion inhibitors (2-hydroxyphosphonoacetic acid, 5-butyl-benzotriazole) in the treatment agent form protective films on metal surfaces and chemically inhibit corrosion reactions, preventing the ROC from directly corroding equipment while maintaining water recycling efficiency
Solution Approach 2:
The treatment agent converts the harmful corrosive properties of the ROC into a beneficial protective effect by using the ROC's chemical composition to enhance the effectiveness of the corrosion inhibitors, creating a synergistic effect that protects equipment while maintaining the water recycling process
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 agent significantly reduces scaling, corrosion, and blockage, ensuring safe operation of the slag flushing system, thereby improving production efficiency and reducing water consumption and costs.
Implementation Method 1
the scale inhibitor includes polyamino polyether methylene phosphonic acid (PAPEMP) and a dendritic polymer poly (amidoamine) (PAMAM)
Implementation Method 2
inhibiting scale formation
Implementation Method 3
the carbon steel corrosion inhibitor includes 2-hydroxyphosphonoacetic acid (HPAA)
Implementation Method 4
the copper corrosion inhibitor includes 5-butyl-benzotriazole
Implementation Method 5
the complex cleaning agent includes citric acid and formic acid for rust removal
Implementation Method 6
the wetting agent includes polyethylene glycol (PEG) for wetting
Data Source
AI summary
A treatment agent for water quenching and slag flushing of a yellow phosphorus slag using reverse osmosis concentrate (ROC) and a preparation method thereof are provided. The treatment agent for water quenching and slag flushing of the yellow phosphorus slag using ROC includes the following components in mass percentage: 3% to 10% of a dispersant, 1% to 3% of a wetting agent, 3% to 10% of a scale inhibitor, 3% to 8% of a carbon steel corrosion inhibitor, 0.5% to 1% of a copper corrosion inhibitor, 5% to 25% of a complex cleaning agent, and water as a balance.