Low-Molecular-Ratio Cryolite Electrolyte for Aluminum Reduction
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Solution Overview
Problem
The conventional aluminium electrolysis process has high power consumption and electrolyte supplement systems are not ideal, primarily due to the high liquidus temperature of cryolite-aluminium oxide systems, which leads to increased fluoride volatilization and production costs.
Innovation Solution
Implementing a low-molecular-ratio cryolite electrolyte supplement system, specifically selecting from mKF.AlF3, nNaF.AlF3, or their mixtures with m=1-1.5 and n=1-1.5, to reduce electrolytic temperature and improve aluminium oxide solubility, thereby decreasing power consumption and fluoride volatilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional cryolite-aluminium oxide electrolyte system is used, then aluminium electrolysis can proceed continuously, but electrolytic temperature is high and power consumption is high
Solution Approach 1:
The patent changes the molecular ratio parameter of cryolite from conventional m=3.0 to low molecular ratio m=1.0-1.5, which fundamentally alters the electrolyte's liquidus temperature and electrical conductivity properties, enabling lower operating temperature and reduced power consumption while maintaining continuous electrolysis capability
Solution Approach 2:
The patent creates a composite electrolyte system by combining low molecular ratio cryolite (mKF.AlF3 or nNaF.AlF3 with m or n=1.0-1.5) with aluminium oxide, forming a new electrolyte composition that achieves both continuous electrolysis and reduced energy consumption
2Manufacturing precision
If conventional synthesis method is used to prepare cryolite, then cryolite with molecular ratio m=3.0 can be produced, but it is difficult to obtain pure low-molecular-ratio cryolite with m=1.0-1.5
Solution Approach 1:
The patent performs preliminary action by precisely controlling the molecular ratio during the synthesis stage itself, using specific molar ratios of raw materials (KF/AlF3 or NaF/AlF3 between 1.0-1.5:1) to directly produce low molecular ratio cryolite, rather than attempting to adjust the ratio after synthesis
Solution Approach 2:
The patent changes the synthesis parameters by using unconventional raw material ratios (deviating from the conventional 3:1 ratio) to directly obtain low molecular ratio cryolite with m=1.0-1.5, achieving both high purity and precise molecular ratio control
3Quantity of substance
If high electrolytic temperature is maintained, then aluminium oxide solubility is improved, but fluoride volatilization loss increases
Solution Approach 1:
The patent changes the electrolyte composition parameter (low molecular ratio cryolite) to achieve the same aluminium oxide solubility at a lower temperature, thereby reducing fluoride volatilization loss while maintaining adequate aluminium oxide dissolution
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 use of low-molecular-ratio cryolite systems reduces electrolytic temperature, lowers power consumption, minimizes fluoride loss, and decreases overall production costs while maintaining improved aluminium oxide solubility.
Implementation Method 1
the solubility property of aluminium oxide is improved, thus, the electrolytic temperature is reduced
Data Source
AI summary
The disclosure provides an electrolyte supplement system in an aluminum electrolysis process, which includes low-molecular-ratio cryolite, wherein the low-molecular-ratio cryolite is selected from mKF.AlF3, nNaF.AlF3 or mixture thereof, where m=1˜1.5 and n=1˜1.5. When the electrolyte supplement system provided by the disclosure is applied to the aluminum electrolytic industry, electrolytic temperature can be reduced obviously in the aluminum electrolysis process without changing the existing electrolytic process; thus, power consumption is reduced, volatilization loss of fluoride is reduced and the comprehensive cost of production is reduced.