Lead Acetate Precipitation for Heavy Metal Removal
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Solution Overview
Problem
Current methods are ineffective and costly for reducing heavy metal concentrations, particularly molybdenum, tungsten, and chromium, in aqueous solutions such as wastewater and mineral acids, with no known cost-effective solution for achieving regulatory compliance.
Innovation Solution
The use of lead salts, especially lead acetate, is employed to form sparingly soluble precipitates with heavy metal anions in aqueous solutions, allowing for efficient removal of heavy metals through precipitation, which can be easily filtered out, reducing concentrations by up to 99% and ensuring compliance with regulatory limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to remove heavy metals from aqueous solutions, then removal efficiency is insufficient, but cost increases and regulatory compliance cannot be achieved
Solution Approach 1:
The patent changes the chemical parameter by using lead salts (especially lead acetate) instead of conventional removal methods. This parameter change enables the formation of sparingly soluble lead salt precipitates with heavy metal anions, achieving over 99% removal efficiency while maintaining cost-effectiveness through simple filtration processes
Solution Approach 2:
The patent extracts heavy metals from aqueous solutions by forming insoluble precipitates with lead salts. The heavy metal anions are taken out of the solution phase and converted into solid precipitate form, which can then be easily separated through filtration, achieving both high removal efficiency and low cost
2Reliability
If heavy metal concentration is reduced to meet regulatory limits, then compliance is achieved, but existing methods are ineffective for cost-effective removal
Solution Approach 1:
The patent applies parameter change by using lead salts to precipitate heavy metals, achieving reduction to below 1 ppm (99% removal) which meets regulatory limits. The process remains simple requiring only addition of lead salt and filtration, making it easy to manufacture and implement
Solution Approach 2:
The patent uses inexpensive lead salts (especially lead acetate) as a disposable reagent to remove heavy metals. The lead salt is added to the solution, forms precipitates, and is then filtered out with the heavy metals. This disposable approach achieves regulatory compliance without requiring complex or expensive equipment
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
Lead salts, particularly lead acetate, effectively reduce heavy metal concentrations by 50% to 99% in aqueous solutions, including wastewater and mineral acids, offering a cost-effective and efficient method for achieving regulatory compliance without the need for expensive equipment or complex processes.
Implementation Method 1
adding at least one water soluble lead salt to the aqueous solution, and removing the formed precipitate from the aqueous solution
Data Source
AI summary
The present invention refers to the removal of heavy metals, such as molybdenum and/or tungsten and/or chromium, from aqueous solutions, especially water such as wastewater or aqueous mineral acids, with the help of a lead salt. It further refers to the use of a lead salt, especially lead acetate, for the removal of heavy metals, especially molybdenum, tungsten and/or chromium, from aqueous solutions.