T/BYXT 058-2023 Active

Scope: This document specifies the terminology definitions, technical requirements, test methods, inspection rules, labeling, packaging, transportation and storage, and sales and services for rare earth multi-element potassium-rich fertilizers. This document applies to mineral potassium fertilizers produced primarily from rare earth associated ores and sold by enterprises. Main technical content: 4.1 Appearance requirements: Granular, strip-shaped, or plate-shaped products, free from mechanical impurities. 4.2 Technical indicators: The products shall comply with the technical indicators in Table 1 and the values indicated on the packaging containers. **Table 1: Technical Indicators** Indicator Standard Grade Pass Grade Total Nutrients (a = K2O + CaO5 + MgO + SiO2 + SeO2) ≥65.0 ≥60.0 ≥54.0 Citrate-soluble potassium (K2O) ≥20.0 ≥19.0 ≥18.0 Citrate-soluble calcium (CaO) ≥9.0 ≥8.0 ≥7.0 Citrate-soluble magnesium (MgO) ≥5.0 ≥4.5 ≥4.0 Citrate-soluble silicon (SiO2) ≥31.0 ≥28.0 ≥25.0 Rare earth elements (CeO2) ≤0.25 ≤0.20 ≤0.10 pH (1:250 water immersion solution) 9.80 9.70 9.50 Limit components Sulfur (S) ≤0.02% 1.0% 3.0% Chlorine (Cl) ≤0.000059% 1.0% 3.0% Sodium (Na) ≤0.03% 1.0% 3.0% Mercury (Hg) ≤5ppm Arsenic (As) ≤10ppm Cadmium (Cd) ≤10ppm Lead (Pb) ≤50ppm Chromium (Cr) ≤50ppm Water content (HO2) ≥0.08 1.0 1.5 Particle size (c = particle diameter ≤ 0.25mm) ≤99.7 ≥90.0 ≥80.0 a The single nutrient content of the product shall not be less than 4.0%, and the absolute value of the negative deviation between the single nutrient determination value and the indicated value shall not exceed 1.5%. The total amount of rare earth elements shall not exceed 0.25%. b The water content shall be based on the data from the factory inspection of the manufacturer. c No particle size requireme