In today’s era of rapid development of the new energy industry, lithium carbonate, as the core raw material of lithium batteries, its processing quality directly affects the performance of the batteries and the production costs. In the crushing process of lithium carbonate, how to select equipment with high efficiency, low powder, no pollution, and controllable particle size has become the focus of attention for many lithium salt factories and positive material enterprises. Currently, the mainstream carbonate lithium crushing equipment on the market mainly includes three types: double tooth roll crusher, four roll crusher, and hydraulic roller crusher. Each of them has its own characteristics and is suitable for different process stages and production capacity requirements. This article will start from the working principle, applicable scenarios, technical advantages, and selection suggestions to help you match the appropriate model.
1. Double tooth roll crusher: Suitable for coarse crushing, with high efficiency in handling large chunks and lumps. Lithium carbonate is prone to form hard lumps (with diameters up to over 100mm) during drying or storage. If it is directly subjected to fine crushing or grinding processes, it is likely to clog the equipment. At this point, the double tooth roll crusher becomes an ideal solution for coarse crushing. The double tooth roll crusher operates by having two rollers with jagged teeth rotating towards each other. It uses a combination of shearing and splitting to break apart large pieces of material. Its advantages are: Large feed particle size: Capable of handling hard lumps with a maximum size of ≤ 150mm; High fragmentation ratio: One crushing operation can reduce large pieces to 20–30mm. Simple structure, easy maintenance: No high-speed components, low failure rate; Over-crushing: Compared to hammering, the powder quantity control is better. However, it should be noted that the output particle size of the double tooth roll crusher is relatively coarse and the distribution is wide. It is not suitable for directly being used in the preparation of finished products. Usually, it is used as a front-end pre-crushing equipment to “reduce the burden” for the subsequent fine crushing process. Applicable scenarios: Primary crushing of large chunks of material after lithium carbonate drying, or as the first stage of a two-stage crushing process when combined with other equipment.
2. Four roll crusher: Main equipment for medium and fine crushing, with uniform particle size and stable production capacity. When lithium carbonate needs to be crushed to a medium-fine size of 5-15mm, the four roll crusher (i.e., two pairs of rollers connected in series) demonstrates unique advantages. It is equivalent to two pairs of rollers stacked vertically, with the material first being crushed coarsely by the upper roller and then finely by the lower roller, achieving “one machine with two levels” of crushing. Its core advantages include: More uniform particle size: The double extrusion process ensures a continuous particle gradation and reduces the occurrence of angular and flaky particles. Capacity enhancement: Compared to a single pair of rollers, the processing volume per unit time has increased by 30% – 50%. Flexible adjustment: The gap between the upper and lower rollers can be adjusted independently, meeting different discharge requirements. Smooth operation: Low-speed operation with minimal vibration, suitable for continuous production lines. More importantly, the four roll crusher does not involve metal hammering or high-speed friction, thus avoiding the introduction of iron contamination and ensuring the purity of lithium carbonate – this is of vital importance for battery-grade materials. However, the four roll crusher has a relatively complex structure and occupies more space. Its investment cost is higher than that of a single pair of rolls. It is more suitable for medium and large-scale lithium salt plants or projects with higher requirements for particle shape. Applicable scenario: Fine grinding process of lithium carbonate, with target particle size ranging from 5 to 15 mm, such as for the raw materials used in the preparation of cathode material precursors.
3. Hydraulic roller crusher: High-quality fine crushing, with precise particle size, intelligent and reliable performance If your process requires crushing lithium carbonate to a fine particle size of 1–5mm or even finer (such as for high-nickel ternary materials or solid-state batteries), then a hydraulic roller crusher is undoubtedly a good choice. This model adopts the laminated extrusion principle. The two rollers maintain a constant pressure under the drive of the hydraulic system, and the material is slowly crushed. Its prominent advantage lies in: The discharge particle size is accurately controllable: The gap between the rollers can be set through the electronic control panel (e.g. 2mm, 3mm), with an error within ±0.5mm. Low pulverization rate: The proportion of fine powder < 0.074mm can be controlled below 3%, reducing the burden on dust collection. Intelligent protection: Automatically retreats when encountering foreign objects, without stopping or causing damage. Environmental cleanliness: Enclosed structure + low noise, meeting the requirements of GMP workshops; Material safety: The roller skin can be made with either non-metallic coating or high-chromium alloy (with strict control over the Fe content), ensuring no pollution. In addition, the hydraulic system supports remote monitoring and data recording, facilitating intelligent management and aligning with the digitalization trend of modern lithium battery factories. Applicable scenarios: Crushing of lithium carbonate finished products, with strict particle size requirements (such as 1–3mm) and purity of ≥ 99.5% for battery-grade products.
Roller Crusher
4. How to Select the Right Model? The key lies in three points. Check the condition of the raw materials: large chunks of material → select the double tooth roll crusher; medium and small chunks → directly place on the hydraulic roller crusher; Output requirements: Coarse crushing (>20mm) → double tooth roll crusher; Medium crushing (5–15mm) → four roll crusher; Fine crushing (1–5mm) → hydraulic roller crusher; Review production capacity and budget: For small factories, single rollers can be selected for trial production; for large-scale continuous production, a combination of four roll crusher or hydraulic roller crusher is recommended. Although lithium carbonate is a “soft mineral” (with a Mohs hardness of 2–3), its high value-added, high purity requirements, and tendency to form lumps determine that the crushing equipment must be “flexible yet robust, precise and reliable. The double tooth roll crusher ensures “smooth entry”, the four roll crusher guarantees “even output”, and the hydraulic roller crusher achieves “accurate control”. These three are not substitutes but rather complementary and collaborative process combinations. Whether you are building a new production line or upgrading an existing one, as long as you clearly define your requirements, there is always a model that suits you. It is recommended to prioritize choosing manufacturers that support trial runs with materials, provide material inspection reports, and have cases in the lithium battery industry. Use the actual effects to verify the performance of the equipment. Only in this way can you equip your lithium carbonate crushing process with an “efficient, clean, and intelligent” heart.
