[Energy Storage] YT’s Improved Sulfuric Acid Process for Green Production of Electronic-Grade Lithium Carbonate
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  • [Energy Storage] YT’s Improved Sulfuric Acid Process for Green Production of Electronic-Grade Lithium Carbonate

[Energy Storage] YT’s Improved Sulfuric Acid Process for Green Production of Electronic-Grade Lithium Carbonate

Process Advantages Small Footprint: The footprint is only 40% of that of conventional processes. Low Energy Consumption: One fan is eliminated, reducing operating energy consumption by 15%. Low Material Consumption: Nitrogen consumption is only 30% of the traditional level. Streamlined Equipment: Fewer pieces of equipment, fewer sealing points, fewer failure points, and higher safety. Long Service Life: The metal membrane is high-temperature resistant, eliminating the risk of bag burnout, requiring minimal maintenance, and being recyclable. Excellent Emissions: Dust concentration <5 mg/Nm³.

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Tag list： [Energy Storage] YT’s Improved Sulfuric Acid Process for Green Production of Electronic-Grade Lithium Carbonate

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YT Green Process/Production System

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INTERMET

YT’s Improved Sulfuric Acid Process for the Green Production of Electronic-Grade Lithium Carbonate

Enhance resource utilization / Reduce production costs / Ensure environmental compliance and stability

 

 

In response to the three major pain points plaguing the lepidolite lithium extraction industry—low lithium recovery, low resource utilization, high production costs, and significant environmental pressures—Chengdu Yitai Technology has launched a world-first YT-Improved Green Process for Lithium Carbonate Production via the Sulfuric Acid Method This process leverages core “defluorination” and “alum formation” technologies to achieve highly efficient conversion of lepidolite resources, boosting lithium recovery to over 90% while simultaneously valorizing a range of associated elements—including fluorine, potassium, aluminum, rubidium, and cesium. It fundamentally addresses the challenges posed by hazardous waste residues, significantly reduces production costs, and propels the development of lepidolite resources into a new, green, high-value phase.

 

 

[Option 1] Main Process for Producing Electronic-Grade Lithium Carbonate via the YT-Improved Sulfuric Acid Method

 

 

1. Project Overview
This scheme employs an innovative process route comprising “pyrometallurgical defluorination roasting combined with hydrometallurgical aluminization and impurity removal.” In the pyrometallurgical stage, defluorination roasting activates the reactivity of lepidolite; in the hydrometallurgical stage, membrane separation technology leveraging the易态核心 (easy-state core) and aluminization precipitation are integrated to achieve efficient lithium extraction and the valorization of associated resources into marketable products.

  • Process flow: Lithium concentrate drying → Defluorination roasting → Acidic roasting → Water leaching and slurry adjustment → Aluminum sulfate precipitation → Two-stage impurity removal followed by lithium precipitation → Resin purification → Battery-grade lithium carbonate.
  • Product portfolio: battery-grade lithium carbonate, industrial alumina, agricultural potassium sulfate, industrial anhydrous potassium fluoride, industrial anhydrous sodium sulfate, rubidium sulfate, and cesium sulfate.

 

2. Technological Innovations

  • Core Technology 1: Defluorination Process (the Core of Cores)
    • Mechanism innovation: Defluorination “activates” the reactivity of lepidolite, laying the foundation for the subsequent conversion of lithium in the ore into soluble lithium sulfate via controlled acidification.
    • Disrupting Tradition: By breaking away from the conventional “fluorine fixation combined with additives” approach that increases slag production, we have achieved the productization of fluorine resources, thereby addressing at the source the industry’s longstanding challenge of “fluorine in slag leading to hazardous waste.”
    • Metrics: Defluorination rate > 95%, lithium recovery rate > 90%.
  • Core Technology ②: Alum Formation Process
    • Increased Production and Reduced Losses: Prior to chemical impurity removal, aluminum, potassium, rubidium, and cesium are converted into alum products, thereby reducing lithium losses caused by lithium adsorption on aluminum slag (resulting in a lithium recovery increase of more than 5%).
    • Reduced Consumption and Enhanced Efficiency: Significantly lowers the consumption of subsequent chemical decontamination agents and improves filter press permeability.

 

3. Advantages of the Plan

  • Lithium Recovery Breakthrough: Lithium recovery has increased from the industry average of less than 75% to over 90%.
  • Significant cost reduction: Lithium carbonate production costs have fallen to RMB 44,000 per tonne (excluding rubidium and cesium) or RMB 32,000 per tonne (including rubidium and cesium), substantially outperforming the industry average of RMB 65,000–75,000 per tonne.
  • Full resource utilization: Six elements—Li, F, K, Na, Al, Rb, and Cs—are commercialized, achieving a resource utilization rate of over 95%.
  • Worry-free environmental protection: Slag volume is reduced by up to 50%, and the slag properties are stable, classifying it as general solid waste (not hazardous waste). Certified in accordance with GB 5085 standards, thereby completely eliminating environmental risks.

 

 

[Option 2] Green Process for the Comprehensive Utilization of Leaching Residue Resources

 

 

 

1. Project Overview
For the leaching residue generated by the primary process, advanced deep-processing technologies are employed to transform this waste into valuable resources. This process converts elements such as silicon, aluminum, potassium, rubidium, and cesium in the residue into high-value-added products, thereby addressing the challenges of residue disposal while generating substantial additional economic benefits.

 

2. Advantages of the Plan

  • Ultimate slag reduction:   Slag quantity further reduced ~90% , reducing the consumption from the conventional process from ~40 t/t Li₂CO₃ to 2–4 t/t Li₂CO₃.
  • High-value conversion:   Transformation of slag into Precipitated silica, aluminum oxide, potassium sulfate, rubidium sulfate, cesium sulfate High-value products.
  • Significant benefits:   With an annual production capacity of 10,000 tonnes of lithium carbonate, the deeply utilized leaching residue can generate an annual output value of 850 million yuan (Excluding rubidium and cesium.) The extraction and recovery technology for rubidium and cesium achieves a recovery rate of over 85%, with the resulting revenue even sufficient to cover lithium production costs.
  •  

3. Technological Innovations

  • Full-element extraction:   Resource utilization of potassium, aluminum, sodium, rubidium, cesium, and silicon in slag has been achieved, thereby bridging the “last mile” in the utilization of lepidolite resources.
  • Process Collaboration:   Seamlessly integrated with the YT-improved sulfuric acid process, this creates a closed-loop green industrial chain encompassing lithium extraction, alum production, and slag utilization.

 

 

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