粒状过磷酸钙生产工艺

过磷酸钙粒化是科学施肥的需要 ,施用粒状过磷酸钙比粉状的好。这是因为粉状过磷酸钙在土壤中受生物、物理、化学的共同作用 ,大量可溶的 P2 O5转变成植物难于吸收的状态。同时 ,粉状过磷酸钙因含有较高的游离酸和水分 ,物理性能不好 ,发粘易结块 ,很难用于机械化施肥。粒状过磷酸钙没有上述缺点 ,且肥效可以平缓释放 ,流失少 ,作物吸收较完全。因此 ,在等效施肥的条件下 ,粒状过磷酸钙单位面积施肥量远较粉状过磷酸钙少。粒状过磷酸钙可以利用复混肥生产装置生产。这里介绍 3万吨 /年复混肥装备生产粒状过磷酸钙的工艺简况。1　工艺流程简…     

两种粒状过磷酸钙生产工艺的比较

介绍粒状过磷酸钙干燥工艺与免干燥工艺的生产方法,投资、成本和效益对比。说明免干燥工艺投资少、成本低、效益好,但产品强度、质量不如干燥工艺,2种方法生产粒状过磷酸钙产品都是过磷酸钙企业提高效益的好途径。     

关于中和处理过磷酸钙的计算

关于中和处理过磷酸钙的计算曾曼华（湖北省仙桃市磷肥厂）尿素——过磷酸钙系复混肥料是以尿素和过磷酸钙为基础的粒状肥料。由于过磷酸钙中有游离酸和磷酸一钙，尿素与其混合后发生的主要反应有：Ｈ＿３ＰＯ＿４＋ＣＯ（ＮＨ＿２）＿２＝ＣＯ（ＮＨ＿２）＿２·Ｈ＿３Ｐ...     

中华人民共和国国家标准粒状重过磷酸钙

<正> 1 主题内容和适用范围本标准规定了肥料用粒状重过磷酸钙的技术要求、检验规则、试验方法以及包装、标志、运输和贮存。本标准适用于以浓缩萃取磷酸分解磷矿粉制成的粒状重过磷酸钙肥料。2 引用标准HG2220 重过磷酸钙中磷含量的测定磷钼酸喹啉重量法     

粒状过磷酸钙烘干机的技改

2002年,为适应粒状过磷酸钙市场销售的需求,我厂利用硫酸生产线闲置的烘干系统,建成了以含有效P2O5为12%,w(H2O)12%~15%已熟化后的过磷酸钙为原料生产粒状过磷酸钙的车间,设计能力为20 kt/a。工艺流程:行车将原料提至加料平台,通过加料导管加至圆盘造粒机(2 800 mm),制成的颗粒     

过磷酸钙（GB20413-2006）

范围本标准规定了过磷酸钙的要求,试验方法,检验规则,标识,包装、运输和贮存。本标准适用于工业硫酸处理磷矿制成的农业用疏松状和粒状过磷酸钙(包括加入有机质等添加物的过磷酸钙产品)。     

提高过磷酸钙品位的管理和技术措施

我厂具有４０年过磷酸钙的生产历史。目前，湿法过磷酸钙能力１５０ｋｔ／ａ。近几年，为了开拓产品市场，经过不断地改进技术，围绕过磷酸钙开发了一系列新品种。生产出口东南亚地区的粒状过磷酸钙，对粉状过磷酸钙的质量要求比原产品（合格品）高，如粉肥的有效Ｐ２Ｏ５...     

重过磷酸钙

1 范围 本标准规定了重过磷酸钙的要求，试验方法，检验规则，标识，包装、运输和贮存。本标准适用于湿法或热法磷酸处理磷矿粉制成的农业用粉状和粒状重过磷酸钙（包括加入有机质等添加物的重过磷酸钙产品）。     

建议HG2740-95标准增加粒状过磷酸钙的技术要求

HG2 740 95标准是原化学工业部于 1995年 7月 2 5日批准实施的“过磷酸钙”标准。它适用于以工业硫酸处理磷矿制成的农业用疏松状过磷酸钙。该标准第 4章技术要求 4· 1外观中有色疏松状物之叙述值得商榷。在过磷酸钙生产、使用过程中 ,开发粒状过磷酸钙易分解 ,且作物易吸收、易实播。颗粒状过磷酸钙的生产工艺简单 ,将疏松状过磷酸钙经造粒烘干而成 ,在整个生产过程中只加少量的水增加成粒率。所以HG2 740 95标准中“有色疏松状物”的外观要求应随产品及市场的变化进行修订。目前生产企业遇到很大的问题是 ,外标识、标注“粒状过磷酸钙…     

中国国家标准化管理委员会发布《重过磷酸钙》国家标准

2007年11月30日,中国国家标准化管理委员会(SAC)发布《重过磷酸钙》国家标准。本标准规定了重过磷酸钙产品的要求,试验方法,检验规则,标识,包装,运输及贮存,适用于湿法或热法磷酸处理磷矿粉制成的农业用粉状或粒状重过磷酸钙。重过磷酸钙应符合表1要求,同时应符合包装容器的标明值。     

对安宁料浆法重钙装置改产磷酸二铵初探

安宁料浆法重钙与磷酸二二铵生产的设备和工艺控制极其相似，对其进行适当改造，可以将料浆法重钱装置改产磷铵。     

重钙及普钙中有效磷的直接提取

本文研究了用中性柠檬酸铵直接提取重钙及普钙中的有效磷 ,较之现行化工行业标准规定的方法减少用时 2h以上 ,分析结果与标准法结果的绝对差值小于 0 .1 0 %。     

硝铵系掺混肥研制中的问题与对策

开发以粒状硝铵为氮源的普钙、氯化钾掺混肥，并在包装过程中采取排气措施，减少袋内空气和物料的流动，减少了掺混后的分层。     

普钙湿法生产微机控制系统

本文介绍了普钙湿法生产微机控制系统的硬件和软件设计,该系统已在生产实践中收到了明显的经济效益。文中介绍的控制方案,不仅在普钙湿法工艺中有推广价值,也适用于小磷铵生产工艺。     

过磷酸钙复合肥水溶磷退化现象研究

过磷酸钙作为复混肥生产原料时,存在水溶磷的退化现象。用田间实验验证了氨酸法工艺中以过磷酸钙为原料时的水溶磷的退化现象。提出过磷酸钙不宜作为氨酸法工艺原料。     

Obtaining granular NPK fertilizers from single superphosphate and urea

A laboratory study was conducted to elaborate methods for obtaining granular NPK fertilizers from mixtures of single superphosphate (SSP) with urea and potassium salts. Samples of products of various grades containing 32–39% fertilizer nutrients and some micronutrients (B, Cu, Co, Mo, Mn) were obtained and their characteristics determined. Instead of cured SSP the usage of a fresh den product was recommended to reduce environmental pollution. The best results were obtained by drying den superphosphate and neutralizing it with limestone before mixing it with other components. Granulation of mixtures should be carried out by the thermic method at 80–95°C, on account of the liquid phase from melting urea. The hardness of the granules obtained by this method, when stored in a dry room, remained satisfactory for 3 months.This paper is dedicated to the memory of Edgar Arumeel (1911–1993)     

料浆法粒状磷酸一铵装置联产粉状磷酸一铵的改造

由于粒状磷酸一铵产能过剩,对料浆法粒状磷酸一铵装置进行联产粉状磷酸一铵的改造。介绍在工艺流程、喷嘴结构、工艺参数等方面采取的技改措施。不仅用一套装置可以生产粒状和粉状两种磷酸一铵产品,而且降低了能源消耗,仅节煤、节电年创经济效益就达400多万元。     

Reactive rock phosphate fertilizers and soil testing for phosphorus: The effect of particle size of the rock phosphate

North Carolina rock phosphate (NCRP) (highly carbonate—substituted apatite) was ground to produce three samples with different particle size distributions. The effectiveness of these fertilizers was compared with the effectiveness of superphosphate in a field experiment and three glasshouse experiments using lateritic soils from south-western Australia. Non-reactive Queensland rock phosphate (low carbonate-substituted apatite from the Duchess deposit) was also used in the pot experiments. Bicarbonate-soluble phosphorus extracted from the soil is widely used in Western Australia to predict plant yields from previously-applied fertilizer dressings. For both field and pot experiments bicarbonate-extractable phosphorus (soil test value) was measured and related to subsequent plant yields.As calculated from the initial slope of the relationship between yield and the level of P applied, finely powdered NCRP was about 5–32% as effective as freshly-applied superphosphate in the year of application and also for two years after application in the field experiment, and for two successive crops in the three pot experiments. For both field and pot experiments, finely powdered NCRP, was at best, 1.5–2.0 times as effective as granular NCRP. Relative to freshly-applied superphosphate, the effectiveness of rock phosphates usually decreased with increasing level of application.For each of the crops in the field experiment, the relationships between yield and phosphorus content of plants (i.e. internal efficiency curves) were similar for all fertilizers. Thus the low effectiveness of the rock phosphates relative to superphosphate was solely due to much less phosphorus being taken up by plants. By contrast, in the pot experiments internal efficiency curves differed for different fertilizers. This is attributed to differences in the rate of phosphorus uptake by plant roots during the early stages of plant growth.For both field and pot experiments, soil test calibrations (the relationship between yield and soil test value) differed for rock phosphates and superphosphate. For superphosphate, soil test calibrations also differed for the three different years after the initial application of this fertilizer in the field experiment. For the second crop in the pot experiment, soil test calibrations differed for superphosphate applied at different times (before the first and the second crop). These results point out the difficulty of applying soil testing procedures to soils that have experienced different histories of fertilizer application.     

流化造粒生产非均质尿基复合肥

简要介绍了流化造粒生产高浓度非均质尿基复合肥新工艺的开发和试验过程，结果表明可采用磷酸 一铵、磷酸二铵、普钙或重钙等原料生产尿基复合肥，养份可根据用户需求进行调整。在普钙和重钙颗粒 上喷涂熔融尿液生产的尿基复合肥还能防止吸湿。     

化工废料过磷酸钙在植物秸秆沤肥中的应用

为研究化工废料过磷酸钙对植物秸秆沤肥过程中氮损失率和腐熟时间的影响,以秸秆、瓜蔓、烂菜叶、杂草、畜肥为原材料,以化工废料过磷酸钙为添加剂,在自制的装置中进行沤肥。结果表明:化工废料过磷酸钙有助于减少氮的损失,缩短沤肥腐熟时间。沤肥20 d后,沤肥过程中未添加化工废料过磷酸钙的氮损失率为35.8%,发芽指数为64.3%;而添加了化工废料过磷酸钙的氮损失率为15.2%,发芽指数为82.8%。化工废料过磷酸钙在植物秸秆沤肥过程取得了良好的应用效果。