Solid Phase Lead Recovery from Waste Batteries
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Solution Overview
Problem
The existing pyrometallurgical and hydrometallurgical methods for processing lead-containing materials face high energy consumption, environmental pollution, and inefficient processing capacity due to long process flows and high reagent costs, particularly in recycling lead from waste lead-acid batteries and residues.
Innovation Solution
A method involving a solid phase reaction where lead-containing materials are processed with a more active metal substance (zinc, iron, or aluminum) in a grinder, followed by washing, filtering, and melt casting to produce high-content lead, reducing the process flow and reagent usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pyrometallurgical process is used for processing lead paste, then lead recycling is achieved, but energy consumption is high and atmospheric pollutants are produced
Solution Approach 1:
The invention changes the fundamental parameter of the reaction phase from solid-gas (pyrometallurgical) to solid-liquid (hydrometallurgical), enabling the reaction to proceed at lower temperatures without combustion, thus dramatically reducing energy consumption while maintaining lead recycling efficiency
Solution Approach 2:
The invention replaces the thermal-mechanical pyrometallurgical system with a chemical-hydrometallurgical system using cementation reaction, substituting high-temperature thermal processes with ambient or low-temperature chemical reactions, thereby eliminating the need for high energy input
2Productivity
If pyrometallurgical process is used for processing lead paste, then lead recycling is achieved, but atmospheric pollutants such as sulfur dioxide and volatile lead dust are produced
Solution Approach 1:
The invention changes the reaction phase parameter from solid-gas to solid-liquid, which fundamentally alters the reaction pathway to eliminate gaseous pollutant formation. The cementation reaction occurs in aqueous solution, preventing sulfur dioxide and volatile lead dust emissions while maintaining effective lead recovery
Solution Approach 2:
The invention converts the harmful high-temperature combustion process into a beneficial low-temperature chemical reaction that produces no atmospheric pollutants. The exothermic cementation reaction provides necessary heat without combustion, turning a potentially harmful thermal process into a clean chemical process
3Productivity
If conventional hydrometallurgical method is used, then lead is recovered from solution, but process flow is long and reagent cost is high
Solution Approach 1:
The invention merges the leaching and cementation steps into a single integrated operation. By adding metal powder directly to the slurry containing lead compounds, both dissolution and precipitation occur simultaneously in one reactor, eliminating the need for separate leaching tanks, filtration systems, and solution handling equipment, thus dramatically simplifying the process flow
Solution Approach 2:
The invention extracts and eliminates the intermediate solution handling steps from the conventional hydrometallurgical process. By performing cementation directly in the slurry phase without isolating the leachate, the method removes the need for solution storage tanks, pumps, and multiple filtration stages, reducing equipment complexity
4Productivity
If conventional hydrometallurgical method is used, then lead is recovered from solution, but large liquid-solid ratio is required which limits processing capacity
Solution Approach 1:
The invention merges the solid metal reagent directly into the slurry matrix, eliminating the need for large volumes of leaching solution. The metal powder is distributed throughout the solid-liquid mixture, enabling the reaction to proceed in a near-slurry state with minimal liquid content, thus dramatically reducing the liquid-solid ratio and increasing processing capacity
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
This method achieves low energy consumption, simplifies the process flow, enhances processing capacity, and meets environmental requirements by eliminating the need for leaching and electrodeposition, while minimizing water and reagent costs.
Implementation Method 1
the solid phase reaction between the lead-containing material and the metal substance is directly caused by the grinder through a mechanical force
Implementation Method 2
the solid phase reaction between the lead-containing material and the metal substance is directly caused by the grinder
Implementation Method 3
washing and filtering the reaction product to obtain the lead and a metal salt solution
Implementation Method 4
performing a melt casting on the lead to obtain a crude lead
Implementation Method 5
crystallizing the metal salt solution to obtain a metal salt corresponding to the metal substance
Data Source
AI summary
A method for preparing lead directly from a lead-containing material by a solid phase reaction, includes: step 1, adding the lead-containing material to be processed to the grinder, and adding a metal substance and water to the grinder, wherein an activity of the metal substance is larger than that of lead; the solid phase reaction between the lead-containing material and the metal substance is caused directly by the grinder through a mechanical force to obtain a reaction product; step 2, washing and filtering the reaction product to obtain the lead and a metal salt solution corresponding to the metal substance; step 3, performing a melt casting on the lead to obtain a crude lead, crystallizing the metal salt solution to obtain a metal salt corresponding to the metal substance.