Urea

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Urea 英文别名:Carbamide; Urea solution; Urea English alias: Carbamide; Urea solution; Urea CAS No.：******6 CAS No.:******6 HS: *******0 HS: *******0 EINECS号：********5 EINECS number: ********5 分子式：CH4N2O Molecular formula: CH4N2O 工业用尿素的质量指标：(GB ***0一***1) Industrial quality index of urea (GB ***0: ***1) 指标名称： 一等品 合格品 Index name: first class quality 外观： 白色颗粒或结晶 Appearance: white granule or crystalline 总含氮(N)量(以干基计)的质量分数/%≥ *6.3 *6.3 The total nitrogen (N) content (dry basis) mass fraction / ≥ *6.3 *6.3 缩二脲含量/%≤ *0.*0 1.*0 Shrinkage of two urea content /% ≤ *0.*0 1 铁(Fe)含量/%≤ 0.***5 0.**1 Iron (Fe) content /% ≤ 0.***5 0.**1 碱度(以NH3含量计)/%≤ O.**5 0.**0 Alkalinity (NH3 content) /% ≤ O.**5 0.**0 水中不溶物含量/%≤0.*1 O.*4 The water insoluble matter content /% ≤ 0.*1 O.*4 水分/%≤0.*0 1.*0 Water /% ≤ 0.*0 1 粒度(φ0.8～2.5mm)/%≥ *0 *0 Particle size (diameter 0.8 ~ 2.5mm /% ≥ ***0) 尿素：化学式：CO(NH2)2，分子质量*0.*6 ，CO(NH2)2无色或白色针状或棒状结晶体，工业或农业品为白色略带微红色固体颗粒，无臭无味。含氮量约为*6.*7%。密度1.**5g/cm3。熔点**2.7℃。溶于水、醇，难溶于乙醚、氯仿。呈弱碱性。 Urea: chemical formula: CO (NH2) 2, molecular weight *0.*6, CO (NH2) 2 colorless or white needle like or rod like crystals, industrial or agricultural product is white with pale red solid particles, odorless and tasteless. The nitrogen content of about *6.*7%. The density of 1.**5g/cm3. The melting point of **2.7 DEG C. Soluble in water, alcohol, insoluble in ether, chloroform. Weakly alkaline. 尿素是一种高浓度氮肥，属中性速效肥料，也可用于生产多种复合肥料。在土壤中不残留任何有害物质，长期施用没有不良影响。畜牧业可用作反刍动物的饲料。 但在造粒中温度过高会产生少量缩二脲，又称双缩脲，对作物有抑制作用。我国规定肥料用尿素缩二脲含量应小于0.5%。缩二脲含量超过1%时，不能做种肥，苗肥和叶面肥，其他施用期的尿素含量也不宜过多或过于集中 Urea is a high concentration of nitrogen, quick acting fertilizer is neutral, and can also be used for the production of a variety of complex fertilizer. Not residual any harmful substances in the soil, long-term application of no adverse effect. Animal husbandry can be used as ruminant animal feed. But in the granulation temperature is too high will produce a small amount of shrinkage of two urea, also called biuret, has inhibitory effect on crop. China fertilizer with urea shrinkage of two urea content should be less than 0.5%. Shrinkage of two urea content exceeds 1%, can't do a fertilizer, fertilizer and foliar fertilizer, urea content in other application periods also shoulds not be too much or too concentrated