Laterite Nickel Electroleaching Under Mild Process Conditions
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Solution Overview
Problem
Conventional nickel extraction from laterite minerals is costly, energy-intensive, and environmentally unfriendly, with high operating, capital, and maintenance costs due to high pressure and temperature requirements.
Innovation Solution
A three-step process comprising acid electroleaching, selective acid precipitation, and nickel electrowinning, utilizing a DC current and specific chemical treatments to enhance dissolution and separation, reduces costs and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional high pressure and high temperature process is used for nickel extraction, then nickel can be extracted from laterite minerals, but operating costs, capital costs, and energy needs increase significantly
Solution Approach 1:
The patent changes the operating parameters from high pressure (750 psi) and high temperature (255°C) to ambient or mild conditions by using a novel leaching reagent system. This parameter change directly reduces energy consumption while maintaining nickel extraction effectiveness from laterite minerals.
Solution Approach 2:
The patent replaces the mechanical/thermal system (high pressure and temperature) with a chemical system (specific leaching reagents and electrochemical processes). This substitution eliminates the need for expensive pressure vessels and high-energy heating systems, reducing both capital and operating costs.
2Productivity
If conventional high pressure and high temperature process is used for nickel extraction, then nickel can be extracted from laterite minerals, but operating costs and capital costs increase
Solution Approach 1:
The patent uses inexpensive, readily available leaching reagents that can be applied at ambient conditions rather than requiring expensive, specialized equipment for high pressure and temperature operations. This approach significantly reduces capital investment while maintaining extraction effectiveness.
3Productivity
If conventional high pressure and high temperature process is used for nickel extraction, then nickel can be extracted from laterite minerals, but maintenance costs increase due to corrosion issues
Solution Approach 1:
By replacing the high pressure/temperature mechanical system with a chemical leaching system operating at ambient conditions, the patent eliminates the need for corrosion-resistant pressure vessels and high-temperature equipment, thereby reducing maintenance costs associated with corrosion.
4Productivity
If conventional high pressure and high temperature process is used for nickel extraction, then nickel can be extracted from laterite minerals, but environmental impact increases
Solution Approach 1:
The patent changes the process parameters to ambient temperature and pressure, eliminating the need for high-energy heating and pressurization systems. This reduces CO2 emissions and energy consumption associated with conventional high-pressure acid leaching processes.
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 method effectively extracts nickel and other metals from laterite minerals with reduced operating, capital, and energy costs, while being more environmentally friendly.
Implementation Method 1
a acid electroleaching step
Implementation Method 2
acid electroleaching step
Implementation Method 3
a nickel electrowinning step
Implementation Method 4
a selective acid precipitation step
Data Source
AI summary
The present invention provides an extracting method of extracting nickel from laterite minerals. The extracting method comprises steps of gathering laterite minerals, placing electrodes into a solution, heating the solution to 75 degrees Celsius, placing the electrodes within the solution, applying a constant current, shutting off the current, filtering the solution, pouring an alkaline solution into the solution, cooling down the solution at room temperature, cooling down the solution to 0 degrees Celsius, filtering the solution, and immersing the electrodes into the solution, adding additional materials to the solution.