High-Purity Copper Oxide Production via Closed-Loop Carbon-Ammonia Recycling
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Solution Overview
Problem
Conventional methods for producing copper oxide for flexible printed circuit boards result in high impurity content, high production costs, and environmental concerns due to inefficient recycling and utilization of ammonia and carbon dioxide byproducts.
Innovation Solution
A closed-loop process is developed to produce high-purity copper oxide by forming a carbon-ammonia system solution, reacting it with metallic copper, deaminating, filtering, and calcining to recycle ammonia, carbon dioxide, and water vapor, which are reused in the process, reducing energy consumption and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods using copper sulfate and sodium carbonate are used to prepare copper oxide, then the production process is simple, but the product contains high impurity content and does not meet the requirements of advanced FPC electroplating
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by using copper metal instead of copper sulfate, and using a carbon-ammonia system (ammonia water and carbon dioxide) instead of sodium carbonate. This parameter change transforms the reaction pathway to produce high-purity copper oxide that meets FPC electroplating requirements while maintaining process simplicity
Solution Approach 2:
The patent converts the previously harmful waste byproducts (ammonia and carbon dioxide gases) into beneficial recycled resources. By implementing a closed-loop system where these gases are absorbed and reused in the carbon-ammonia system solution preparation, the process achieves both high purity product and environmental sustainability
2Object-affected harmful factors
If ammonia and carbon dioxide are not recycled in the copper dissolution process, then the production cost is low and the process is simple, but the environmental pollution is severe and the cost of chemical agents is high
Solution Approach 1:
The patent implements a feedback mechanism where ammonia and carbon dioxide gases produced during copper dissolution are captured, absorbed into water to form the carbon-ammonia system solution, and fed back into the reaction process. This closed-loop feedback system eliminates environmental pollution while maintaining economic efficiency
Solution Approach 2:
The system is designed to be self-sufficient by using the byproducts of the reaction (ammonia and carbon dioxide gases) to prepare the reactant solution (carbon-ammonia system). The process serves itself by converting waste into useful resources, eliminating the need for external chemical agent inputs and reducing environmental impact
3Loss of energy
If ammonia water and carbon dioxide are absorbed and heated to recycle volatile gases, then the gases can be recovered, but the energy consumption is high due to reheating requirements
Solution Approach 1:
The patent applies preliminary action by absorbing ammonia and carbon dioxide gases into water to form the carbon-ammonia system solution before the main reaction occurs. This pre-preparation of the absorbing solution allows for direct reuse of the gases without requiring subsequent reheating steps, thereby reducing energy consumption while achieving complete gas recovery
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 process achieves high-purity, high-activity copper oxide with reduced energy consumption and environmental pollution, meeting the quality requirements for copper ions in the FPC industry while minimizing waste and costs.
Implementation Method 1
adding copper, ammonia water, and powdery ammonium bicarbonate or ammonium carbonate or a mixture of ammonium bicarbonate and ammonium carbonate into a reaction vessel, stirring continuously while introducing air or oxygen to conduct the reaction
Implementation Method 2
ammonia gas and carbon dioxide produced during the decomposition of ammonium bicarbonate when copper is dissolved in ammonia bicarbonate
Implementation Method 3
the filter cake was retained, washed and calcined at a temperature of 500° C.-700° C. to give copper oxide
Implementation Method 4
utilizes the absorbent to absorb a volatile gas and then the absorbent is heated so that the volatile gas escapes
Data Source
AI summary
The present disclosure provides a process of clean production of electronic grade high-purity copper oxide. The process includes (1) preparing a carbon-ammonia system solution with a certain ratio of CO2, NH3 and H2O; (2) dissolving copper under a slightly negative pressure and at a system temperature less than or equal to 60° C.; the reaction ends until the concentration of copper in the carbon-ammonia system solution reaches 80 to 140 g/L; (3) adding sodium polyacrylate; the reaction solution is heated to 60-80° C. under a reduced pressure for deamination; (4) disposing basic copper carbonate to separate the solid from the liquid by a centrifuge to give an filter cake and copper-containing clear solution; (5) calcining the filter cake at 250-600° C. for 1-5 hours to give an electronic grade high purity copper oxide; ammonia collected in step (3), the copper-containing clear solution collected in step (4), and carbon dioxide and water vapor collected in step (5) are transferred to the solution-preparing device of step (1) and directly used as raw materials for preparing carbonate-ammonia system solution, wherein the copper-containing clear solution is used as water. The process of production of the disclosure has a shortened processing line and a low energy consumption; it is not only cost saving but also can achieve goals of energy saving, reduced emission and environment pollution.