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Industrial-Grade Chuanzexi Ammonium Sulfate Crystals for Rare Earth Extraction. Sulfur Rich Composition: Features 24% sulfur content for optimized fertilizer utilization efficiency. Alkaline Soil Adaptability: Works effectively with alkaline soils to help adjust soil pH levels. Large Production Capacity: Annual output reaches 200,000 metric tons with flexible grade adjustment. Multi-Stage Quality Control: Includes raw material intake, in-process monitoring, and third-party verification. Global Shipping Experience: Delivers on schedule to over 30 countries with 15+ years of experience.