Lithium Clay Enrichment via Flotation and Ball Milling
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Solution Overview
Problem
Current methods for extracting lithium from lithium clay ores face challenges such as high energy consumption, high equipment requirements, large slag yield, and environmental unfriendliness, with low lithium recovery rates and difficulty in separating lithium from gangue minerals due to their easy argillization.
Innovation Solution
A method involving sequential flotation and wet ball milling processes using ferric sulfate or ferric nitrate as activators, sodium oleate and cocoamine as collectors, and sodium hexametaphosphate as an inhibitor, to produce high-grade lithium concentrates with improved recovery rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional extraction methods (limestone roasting, sulfuric acid method, limestone method, soda ash method) are used, then lithium can be extracted from lithium clay, but energy consumption is high and equipment requirements are high
Solution Approach 1:
The patent replaces conventional thermal and chemical extraction methods with a flotation-based separation method. Instead of using high-energy processes like limestone roasting or acid treatment, the invention uses mechanical flotation with selective reagents (ferric sulfate/ferric nitrate as activators, sodium oleate and cocoamine as collectors) to separate lithium-bearing minerals from gangue, dramatically reducing energy consumption while maintaining extraction effectiveness
Solution Approach 2:
The patent optimizes multiple process parameters including pH control (adjusting to specific ranges using regulators), reagent dosages (ferric sulfate 200-400 g/t, sodium oleate 300-500 g/t, cocoamine 100-200 g/t), and particle size distribution (ensuring -0.15 mm constitutes 60-80% of the feed) to achieve efficient lithium enrichment with lower energy input compared to conventional methods
2Quantity of substance
If conventional extraction methods are used, then lithium can be extracted from lithium clay, but slag yield is large and environmental friendliness is poor
Solution Approach 1:
The patent extracts and removes harmful gangue minerals (quartz, feldspar, mica, calcite) from the lithium-bearing minerals during the flotation process. By using selective collectors and activators, the method separates valuable lithium minerals (cookeite, lithiophilite) from waste gangue, producing a concentrated lithium product with minimal slag and reducing environmental harm from waste disposal
Solution Approach 2:
The patent converts the challenge of gangue mineral interference into a benefit by using flotation reagents that selectively attach to gangue surfaces, causing them to float away and leave behind a purified lithium concentrate. The reagents (ferric sulfate, sodium oleate, cocoamine) that might seem like additional chemicals actually help convert the harmful gangue into a separable phase, improving both purification and environmental performance
3Quantity of substance
If lithium clay is processed without pre-enrichment, then all feed material enters metallurgy process, but lithium recovery rate is low and separation from gangue is difficult
Solution Approach 1:
The patent performs preliminary enrichment through flotation before the metallurgy process. By conducting rough flotation and scavenging flotation operations first, the method pre-concentrates lithium-bearing minerals and removes gangue, creating a pre-enriched feed that improves subsequent metallurgical processing efficiency and overall lithium recovery rate
Solution Approach 2:
The patent uses flotation reagents as intermediaries to facilitate separation between lithium-bearing minerals and gangue. The activators (ferric sulfate/ferric nitrate), collectors (sodium oleate, cocoamine), and pH regulators act as intermediary substances that selectively modify surface properties, enabling precise separation and improving both recovery rate and separation precision
4Quantity of substance
If simple flotation is used without multiple stages, then process is simple, but lithium enrichment grade is insufficient
Solution Approach 1:
The patent segments the flotation process into multiple distinct stages: rough flotation for initial concentration, scavenging flotation for further purification, and potentially clean flotation for final enrichment. Each stage uses optimized reagent dosages and pH conditions, progressively increasing lithium oxide grade from the original clay to the final concentrate while managing process complexity through systematic division of tasks
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 achieves a lithium recovery rate of 75% or more and a lithium oxide grade of 1.5% or higher, overcoming the limitations of existing technologies by enhancing flotation efficiency and reducing energy consumption.
Implementation Method 1
adding an aqueous solution of ferric sulfate or ferric nitrate, and stirring evenly
Implementation Method 2
adding an aqueous solution of sodium oleate and an aqueous solution of cocoamine, stirring evenly, and then flotation
Implementation Method 3
flotation to obtain a rough concentrate and a rough tailing
Implementation Method 4
adding an aqueous solution of sodium hexametaphosphate, stirring evenly
Data Source
AI summary
A method for enriching lithium from a lithium clay includes the following steps (1) the raw ore were crushed to produce fine particles, (2) performing rougher on the fine particles by adding ferric sulfate or ferric nitrate, sodium oleate, and cocoamine to obtain rough concentrate and rough tailing, (3) finely separating the rough concentrate to obtain the first part of concentrate, (4) re-grinding the rough tailing by ball mill, (5) performing rougher on the reground tailing to obtain reground rough concentrate and re-ground rough tailing, (6) performing cleaner on the reground rough concentrate to obtain the second part of concentrate, and (7) performing scavenger on the reground rough tailing to obtain the cleaned tailing.