Lithium carbonate double cone vacuum dryer is a specialized equipment designed for the drying needs of lithium carbonate (especially battery grade, pharmaceutical grade and other high-purity lithium carbonate). Its advantages stem from the synergistic effect of vacuum environment and double cone structure, perfectly matching the material characteristics of lithium carbonate (thermal sensitivity, high purity requirements, uniform drying, etc.). The specific advantages are as follows:
1、 Low temperature drying to protect material properties
Although lithium carbonate has a high melting point (about 720 ℃), high-purity lithium carbonate (such as battery grade) may have lattice defects due to local overheating at high temperatures, or adsorb CO ₂ and H ₂ O from the air to form impurities (such as Li ₂ CO ∝・ H ₂ O).
The double cone vacuum dryer reduces system pressure by vacuuming, significantly lowering the boiling point of water (or solvent) (for example, when the vacuum degree is 0.09MPa, the boiling point of water is about 45 ℃). It can complete drying at low temperatures of 40-60 ℃, avoiding high temperature damage to the structure or purity of lithium carbonate, and ensuring stable product performance.
2、 High drying uniformity, avoiding local over drying or residue
The drying of lithium carbonate requires strict control of moisture uniformity (especially for battery grade, moisture content should be ≤ 0.1%), otherwise it will affect the consistency of subsequent electrode materials.
The double cone rotary structure of the double cone dryer continuously flips, mixes, and falls the material during the rotation process, ensuring full contact with the heating surface of the jacket and uniform heating surface; At the same time, the vaporization rate of water in a vacuum environment is consistent, avoiding the problem of "bottom layer moisture and surface layer over drying" in traditional static drying, and the final product moisture deviation can be controlled within 0.02%.
3、 Isolate the air to ensure product purity
High purity lithium carbonate (such as battery grade) is highly sensitive to impurities (metal ions such as Fe, Cu, Na, or CO ₂, dust), and once contaminated, it will directly affect the battery cycle life and safety.
The double cone vacuum dryer is a fully enclosed system that is completely isolated from air during the drying process
Avoid the reaction between CO ₂, O ₂ in the air and lithium carbonate (such as 2Li ₂ CO ∝+O ₂+H ₂ O → impurities);
Reduce dust flying (negative pressure inside the double cone, no material overflow), and avoid cross contamination;
Suitable for inert gas protection (such as nitrogen atmosphere), further preventing oxidation or impurity adsorption, the final product purity can be stably maintained at 99.5% or above (battery grade requirement ≥ 99.9%).
4、 High drying efficiency and shortened production cycle
In a vacuum environment, the driving force (concentration difference) for the vaporization of water (or solvent) is much greater than that under normal pressure. Coupled with the "forced flipping" caused by the rotation of the double cone, the mass and heat transfer efficiency between the material and the heating surface is significantly improved
The migration speed of moisture from the interior of the material to the surface is accelerated;
The vaporized water vapor is directly pumped away by a vacuum pump to avoid secondary adsorption;
Compared to atmospheric hot air drying, the drying time can be shortened by 30% -50% (for example, traditional hot air drying takes 8-10 hours, while double cone vacuum drying only takes 3-5 hours), greatly improving production efficiency.
5、 Energy conservation and consumption reduction, lowering operating costs
Low temperature energy-saving: No need for high temperature heating (traditional hot air drying may require over 100 ℃), reduced jacket heating power, especially suitable for large-scale production;
High heat utilization rate: The double cone structure has strong sealing, and the heat generated by the jacket heating is only used for material and moisture vaporization, without heat loss caused by hot air emissions;
The energy consumption of the vacuum system is controllable: modern vacuum units (such as Roots water ring units) have low energy consumption, and the vacuum degree can gradually decrease in the later stage of drying, further saving energy.
Jinkebotong Environmental Protection Technology (Jiangsu) Co., Ltd
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