Sodium Bromide Purification Using Pyrolysis Coke from Waste PCBs
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Solution Overview
Problem
Current methods for treating waste circuit boards focus on metal and fiberglass recovery, while the coke in pyrolysis residues is often incinerated without secondary utilization, and the crude bromine salt obtained from smelting ash lacks further purification, leading to resource waste and high operational costs.
Innovation Solution
A method using coke from pyrolysis residues as a reducing agent to convert crude bromine salt into pure sodium bromide through carbonization, water dissolution, filtration, and vacuum crystallization, eliminating the need for additional reducing agents and achieving resource coupling and integrated waste utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If coke from pyrolysis residues is incinerated without secondary utilization, then operational simplicity is maintained, but resource utilization rate deteriorates
Solution Approach 1:
The coke from pyrolysis residues serves as its own reducing agent for the crude bromine salt, eliminating the need for external reducing agents. The waste material (coke) is utilized to treat another waste material (crude bromine salt), achieving self-service waste treatment and resource recovery within the system.
Solution Approach 2:
Instead of discarding the coke from pyrolysis residues through incineration, the invention recovers its value by using it as a reducing agent to produce sodium bromide. This transforms a waste stream into a valuable resource, simultaneously treating the crude bromine salt and producing high-purity sodium bromide product.
2Manufacturing precision
If traditional reducing agents are used to purify crude bromine salt, then purification effectiveness is improved, but operational cost and complexity deteriorate
Solution Approach 1:
The system uses the coke already present in the pyrolysis residues as the reducing agent, eliminating the need to introduce external reducing agents and their associated handling, storage, and addition equipment. This self-service approach maintains purification effectiveness while simplifying the operational process.
Solution Approach 2:
The coke acts as an intermediary substance that facilitates the reduction of crude bromine salt to sodium bromide. By using this intermediate material that is already present in the system, the invention avoids the complexity of introducing and managing external chemical agents.
3Loss of substance
If coke is used as reducing agent to convert crude bromine salt, then resource utilization rate is improved, but process complexity increases
Solution Approach 1:
The invention merges two waste treatment processes into one integrated process: the pyrolysis residue treatment and the crude bromine salt purification. By combining these processes, the coke from pyrolysis is simultaneously utilized as a reducing agent, reducing overall process complexity while maximizing resource utilization.
Solution Approach 2:
The coke from pyrolysis residues serves multiple functions: it is both a product of pyrolysis and a reducing agent for bromine salt purification. This multi-functionality reduces the need for separate treatment processes and materials, optimizing resource utilization without proportionally increasing process complexity.
4Device complexity
If crude bromine salt is not further purified, then operational cost is reduced, but product quality and value deteriorate
Solution Approach 1:
The system performs self-purification using the coke as a reducing agent that converts crude bromine salt into high-purity sodium bromide. This self-service purification mechanism achieves high product quality without requiring complex external purification equipment or additional costly reagents.
Solution Approach 2:
The invention changes the chemical parameters of the crude bromine salt through reduction reactions with coke, transforming it from a low-value crude product to a high-purity sodium bromide product. This parameter change (chemical composition and purity) is achieved through a relatively simple process that doesn't require complex purification 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
This method achieves high-purity sodium bromide production with a high resource utilization rate and environmental friendliness, meeting industry standards while reducing operational complexity and costs.
Implementation Method 1
A method using coke from pyrolysis residues as a reducing agent to convert crude bromine salt into pure sodium bromide
Implementation Method 2
water dissolution, filtration
Implementation Method 3
concentrated crystallization under vacuum heating
Implementation Method 4
concentrated crystallization under vacuum heating to obtain sodium bromide
Data Source
AI summary
A method for producing and purifying sodium bromide using the coke from waste circuit boards pyrolysis residues as reducing agent, belonging to the field of purifying sodium bromide and high-value utilization, and more particularly, relating to a method for reducing and purifying crude bromine salt obtained from waste circuit boards smelting ash by using the coke in waste circuit boards pyrolysis residues. The main steps are as follows: carbonization conversion, water dissolution, filtration, and concentrated crystallization under vacuum heating. The pure sodium bromide was obtained by reducing crude bromine salt enriched from waste circuit board smelting ash by using the coke in waste circuit boards pyrolysis residues, realizing the resource coupling and high-value utilization of the two wastes, avoiding the secondary pollution in the process of recycling the waste circuit boards. It has the characteristics of simple operation, high resource utilization rate and no tail liquid discharge.