Nickel Sulfate Production via pH Gradient and Hydrogen Heat Recovery
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Solution Overview
Problem
Current methods for producing nickel sulfate, such as dissolving elemental nickel in sulfuric acid, are hazardous, slow, and require additional purification steps due to the production of volatile hydrogen gas and the need for oxidizing agents, which increase costs and decrease efficiency.
Innovation Solution
A two-step process using two vessels to create a pH gradient, allowing elemental nickel to be dissolved in sulfuric acid, producing a high-purity nickel sulfate product with a pH suitable for battery production, while utilizing the clean hydrogen gas as a heat source, and minimizing foam formation through circulation and dispersion devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If elemental nickel is dissolved in sulfuric acid to produce nickel sulfate, then nickel sulfate product is obtained, but volatile hydrogen gas is produced creating a hazardous environment
Solution Approach 1:
The patent converts the harmful volatile hydrogen gas byproduct into a beneficial heating source. The hydrogen gas generated during nickel dissolution is captured and burned to provide process heat, transforming a safety hazard into a useful energy source that maintains reaction temperature without external heating requirements.
Solution Approach 2:
The patent employs an inert atmosphere (nitrogen or carbon dioxide) to replace oxygen in the reaction environment. This prevents the formation of explosive hydrogen-oxygen mixtures while allowing the nickel dissolution reaction to proceed safely. The inert gas blanket eliminates the fire hazard associated with hydrogen production.
2Quantity of substance
If elemental nickel is dissolved in non-oxidizing aqueous acidic solution, then nickel sulfate is produced, but the process is impractically slow
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by introducing oxidizing agents (hydrogen peroxide, ozone, or nitric acid) to the sulfuric acid solution. This transformation converts the slow non-oxidizing acid dissolution into a fast oxidizing acid dissolution, dramatically increasing the reaction rate while still producing nickel sulfate.
3Productivity
If oxidizing agents are added to accelerate nickel dissolution, then reaction rate increases, but additional purification steps are required
Solution Approach 1:
The patent carefully controls the oxidation potential and concentration of oxidizing agents to achieve complete nickel dissolution without excessive oxidation that would require purification. By optimizing the ratio of oxidizing agent to nickel and controlling reaction conditions (temperature, acid concentration), the process achieves high reaction rates while producing a product suitable for battery manufacturing without additional purification steps.
4Productivity
If elemental nickel reacts with sulfuric acid at low pH, then reaction rate increases, but the final product has low pH unsuitable for battery production
Solution Approach 1:
The patent divides the dissolution process into multiple stages with different pH conditions. The first stage uses low pH (0.5-2.0) with oxidizing agents to achieve rapid nickel dissolution. Subsequent stages involve neutralization and pH adjustment to reach the target pH range (2.0-4.0) suitable for battery production. This segmented approach allows optimization of reaction rate and product quality at different process stages.
Solution Approach 2:
The patent performs preliminary dissolution at low pH to maximize reaction rate, then subsequently adjusts the pH to the required range. By completing the dissolution reaction first under optimal kinetic conditions and then adjusting pH as a separate step, the process achieves both high productivity and product specification compliance.
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 process safely and efficiently produces nickel sulfate with high purity and suitable pH for battery applications, reducing the need for additional purification and oxidizing agents, and utilizing hydrogen gas for heat control, thereby enhancing process efficiency and cost-effectiveness.
Implementation Method 1
dissolving elemental nickel in sulfuric acid... volatile hydrogen gas is produced during the process
Implementation Method 2
dissolving metallic nickel in a non-oxidizing aqueous acidic solution that requires the use of an additional oxidizing agent
Implementation Method 3
The off-gas flow may be used to burn to heat water for producing steam that may be used for controlling the temperature of the nickel sulfate solution
Implementation Method 4
steam that may be used for controlling the temperature of the nickel sulfate solution in the vessel
Implementation Method 5
steam that may be used for controlling the temperature
Implementation Method 6
The vessel may further comprise a dispersion device for minimizing foam formation therein
Data Source
AI summary
The present disclosure is directed to processes and systems for dissolving elemental nickel in sulfuric acid solutions to produce nickel sulfate products, and for example. nickel sulfate products suitable for battery materials production.