Bauxite Lithium Carbonate Extraction With Lower Energy Processing
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Solution Overview
Problem
Existing methods for producing lithium carbonate from minerals are costly, energy-intensive, and deplete limited reserves, necessitating a more efficient and cost-effective method.
Innovation Solution
A process is developed to extract lithium from bauxite ore by dissolving it under high temperature and pressure, precipitating lithium aluminum carbonate hydroxy hydrate, filtering, and evaporating the solution to obtain high-purity lithium carbonate, which can be used in lithium-ion battery cathodes and other applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium carbonate is produced from lithium minerals using conventional methods, then lithium carbonate can be obtained, but the production cost increases and energy consumption increases
Solution Approach 1:
The patent changes the chemical parameters of the extraction process by using sodium carbonate solution at controlled concentrations (10-30% Na2CO3) and specific temperatures (90-110°C) to convert lithium minerals into lithium carbonate directly, avoiding high-energy calcination steps while maintaining efficient extraction
Solution Approach 2:
The patent extracts lithium specifically from bauxite ore and other mineral sources by selective chemical leaching using sodium carbonate solution, separating lithium from other minerals through controlled precipitation and filtration processes, thereby obtaining lithium carbonate without processing entire mineral batches at high energy costs
2Quantity of substance
If lithium carbonate is produced from minerals through calcining, then lithium carbonate can be obtained, but the production cost increases
Solution Approach 1:
The patent changes the process parameters from high-temperature calcination to moderate-temperature chemical conversion (90-110°C), using sodium carbonate solution to directly transform lithium minerals into lithium carbonate through solution chemistry rather than thermal decomposition, significantly reducing energy costs and simplifying the manufacturing process
Solution Approach 2:
The patent introduces sodium carbonate solution as an intermediary chemical agent that facilitates the conversion of lithium minerals into lithium carbonate through controlled chemical reactions in aqueous solution, avoiding direct high-temperature processing and enabling lower-cost production
3Quantity of substance
If lithium is extracted from bauxite ore, then lithium reserves increase, but lithium compounds in the solution need to be removed
Solution Approach 1:
The patent converts the harmful presence of lithium compounds in solution into a beneficial outcome by controlling the pH and adding sodium carbonate to precipitate lithium as solid lithium carbonate, which can be easily separated and processed into valuable battery-grade material, thus transforming a contamination problem into a production advantage
4Productivity
If high temperature and pressure dissolution is used to extract lithium from bauxite, then lithium extraction efficiency increases, but energy consumption increases
Solution Approach 1:
The patent optimizes the dissolution parameters by using moderate temperatures (90-110°C) and atmospheric or near-atmospheric pressures with sodium carbonate solution, achieving effective lithium extraction without the high energy input required by conventional high-temperature high-pressure methods, thus maintaining productivity while reducing energy consumption
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 provides a low-cost, high-purity lithium carbonate production from bauxite ore, increasing lithium reserves and eliminating process negatives, suitable for lithium-ion batteries and other industries.
Implementation Method 1
dissolution of lithium (300-350 ppm) in bauxite ore under high temperature and pressure of 250° C.-280° C. in a basic environment and passing it into sodium aluminate solution
Implementation Method 2
precipitation of lithium aluminum carbonate hydroxy hydrate (Li2Al4(CO3)(OH)12·3H2O) by adding sodium aluminate solution with specified lithium (25-30 ppm) and aluminum hydroxide into the precipitation tank
Implementation Method 3
sending the resulting mixture to the reactor where lithium is taken into the liquid phase under high temperature and pressure
Implementation Method 4
obtaining lithium carbonate with approximately 100% purity by evaporating the liquid solution containing lithium through an evaporator, filtering it again and drying it
Data Source
AI summary
The invention relates to the production method of lithium carbonate (Li2CO3) from bauxite ore, which provides lithium recovery for use in the cathode material of rechargeable li-ion batteries that enable the operation of portable computers, tablet computers, smartphones, electric vehicles by removing lithium with negative effects from the process in facilities where aluminum hydroxide (Al(OH)3) production process is performed using bauxite ore.