Addressing the Three Major Production Challenges in Lithium Ore Beneficiation

Lithium ore is a core mineral resource underpinning the development of the new energy industry, and a stable, efficient supply of lithium ore plays an irreplaceable role in the development of the entire new energy industrial chain. However, in actual beneficiation production, many mines face three persistent and intractable challenges: difficulties in improving the overall recovery rate of lithium minerals, significant fluctuations in the grade of lithium concentrate, and persistently high consumption of beneficiation reagents, all of which severely erode mining profits. To improve beneficiation performance, targeted optimisation is required across every detail of the entire process.

I. Appropriate Control of Ore Particle Size Distribution

Grinding fineness is a fundamental factor influencing lithium ore separation; imbalances in particle size control directly reduce the efficiency of classification operations.

If the ore is under-ground, lithium minerals and gangue cannot be sufficiently liberated as individual particles, making it difficult to effectively separate the valuable lithium elements; Conversely, excessive grinding generates large amounts of fine slime, which not only disrupts the flotation environment but also leads to the loss of fine-grained lithium metal. During production, it is necessary to precisely control the grinding particle size range in accordance with the ore’s distribution characteristics to ensure a reasonable and uniform particle size distribution.

II. Strengthening Control of Upstream Desliming Operations

Slime is the primary source of interference in lithium ore beneficiation, with negative impacts occurring on both physical and chemical levels.

From a physical perspective, fine clay particles coat the surfaces of lithium minerals, preventing contact between the collector and the target minerals; from a chemical perspective, the clay adsorbs and consumes large quantities of flotation reagents, altering the original water quality conditions of the pulp and significantly deteriorating the overall separation efficiency. Therefore, the desliming process must not be omitted; by separating fine slime at an early stage, a stable and clean separation environment is created for subsequent flotation.

III. Establishing a Water Quality Control System for the Entire Mineral Processing Flow

The pH of the pulp is a key indicator for regulating mineral floatability and reagent activity; fluctuations in water quality can directly disrupt the flotation equilibrium.

Even slight changes in the water’s pH cause simultaneous alterations in the surface properties of lithium and gangue minerals, leading to a significant reduction in the efficiency of flotation reagents. To stabilise production indicators, it is essential to establish a comprehensive water quality monitoring and adjustment mechanism to control the pulp pH throughout the process, thereby minimising fluctuations in indicators caused by water quality variations.

IV. Dynamic Adjustment of Flotation Foam Conditions

The thickness and stability of the flotation foam directly determine the concentrate grade and metal recovery rate; it is difficult to optimise both simultaneously.

If the foam is too viscous and stable, it tends to entrain large amounts of fine gangue slime into the concentrate, leading directly to a significant decline in lithium concentrate grade; conversely, if the foam is too brittle and prone to collapse, lithium mineral particles struggle to float stably, resulting in a significant reduction in overall recovery rate. During routine production, the foam condition must be monitored in real time, with dynamic and precise adjustments to reagents and aeration rates to balance the two key indicators of grade and recovery.

V. Customised Process Solutions to Achieve Targeted Outcomes

For the above optimisation theories to be effectively implemented, they must be underpinned by long-term, hands-on experience from frontline projects.

The mineral composition, types of impurities and grain size distribution of lithium ores vary greatly across different mining areas, making it difficult for a generic process to suit all ore samples. Drawing on proven practical experience from established lithium mining projects, we can conduct beneficiation tests specifically for a client’s unique ore samples and design a bespoke, comprehensive beneficiation process. By optimising all aspects—including particle size, desliming, water quality and flotation—we can consistently improve the quality of lithium concentrate and resource recovery rates, thereby maximising the economic value of mineral resources.