Lithium Sulfate Monohydrate Flotation for Low Chlorine and Magnesium
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Solution Overview
Problem
Existing processes for lithium sulfate production from high sulfate brines are inefficient and financially unattractive due to high impurity levels of chlorine and magnesium, lacking a technically viable alternative for concentrating lithium sulfate monohydrate with low impurity contents.
Innovation Solution
A two-stage flotation process involving grinding, Rougher flotation, Cleaner flotation, and Scavenger flotation, combined with selective regrinding and recirculation, to concentrate lithium sulfate monohydrate while minimizing impurities, followed by filtration to enhance purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high sulfate brine is processed using conventional methods, then potassium production is achieved, but lithium sulfate concentration with low impurity contents is not obtained
Solution Approach 1:
The flotation process is divided into three distinct stages: Rougher flotation for initial concentration, Cleaner flotation for purification, and Scavenger flotation for final impurity removal. Each stage targets specific impurities and operates with optimized parameters, enabling progressive purification from crude brine to high-purity lithium sulfate monohydrate concentrate with >90% purity and low chlorine and magnesium contents
Solution Approach 2:
Flotation reagents act as intermediaries to selectively separate lithium sulfate from impurities. Collectors, frothers, and modifiers are introduced at each stage to enhance the hydrophobicity of lithium sulfate crystals while keeping impurities hydrophilic, enabling effective separation through air-bubble attachment and selective flotation
2Productivity
If high sulfate brine is processed to produce lithium, then lithium production is achieved, but the process is financially unattractive due to high impurity levels
Solution Approach 1:
The Rougher flotation stage performs preliminary concentration by removing bulk impurities (calcium, magnesium, potassium chlorides) before subsequent purification stages. This preliminary separation reduces the impurity load for downstream processing, improving overall process efficiency and reducing operational costs while achieving high-purity lithium sulfate monohydrate concentrate
Solution Approach 2:
The process selectively discards impurity-rich fractions (tailings from each stage) while recovering and concentrating lithium sulfate in intermediate products. The Scavenger flotation recovers remaining lithium sulfate from Cleaner tailings, minimizing lithium loss while maximizing impurity rejection, thereby improving both productivity and economic viability
3Quantity of substance
If flotation process is used to concentrate lithium sulfate, then lithium sulfate concentration is achieved, but impurities such as chlorine and magnesium remain at high levels
Solution Approach 1:
Each flotation stage is optimized with locally adapted conditions: Rougher flotation uses high reagent doses for bulk impurity removal, Cleaner flotation uses lower reagent doses for selective purification, and Scavenger flotation uses tailored reagent combinations for final impurity removal. This localized optimization at each stage enables progressive purification while maintaining high lithium sulfate concentration
Solution Approach 2:
The process systematically changes operational parameters across stages: pH levels, reagent types and doses, air flow rates, and particle size distributions are adjusted for each flotation stage. These parameter changes enable selective separation of different impurity types (chlorides, sulfates, magnesium compounds) while concentrating lithium sulfate to >90% purity
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 process achieves lithium sulfate monohydrate concentrates with >90% purity, effectively reducing impurities such as chlorine and magnesium, making lithium production economically viable.
Implementation Method 1
A two-stage flotation process involving grinding, Rougher flotation, Cleaner flotation, and Scavenger flotation
Data Source
AI summary
This patent application refers to a process to obtain lithium sulfate monohydrate ore with low contents of impurities associated to chlorine and magnesium; in particular, the process consists of the concentration, through grinding, flotation, and filtration stages, of the lithium sulfate present in potassium Carnallite (KCl*MgCl2*6H20) stockpiles with high contents of lithium sulfate (Li2S04*H20) and sodium chloride (NaCl).