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介绍云天化云峰分公司在磷矿贫化的情况下生产w(总养分)64%(18-46-0)出口DAP的工艺,通过加入工业磷酸一铵清液及硝铵溶液,并采取严格的控制措施,使产品的w(N)达到17.5%,保证了出口产品的质量。 相似文献
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硝铵锌复混肥总氮分析方法探讨 总被引:1,自引:0,他引:1
硝铵锌复混肥中加入尿素提高氮含量 ,需准确分析总氮含量。本文通过试验 ,建立了用二乙酰乙肟比色法测定硝铵锌复混肥中尿素氮含量 ,用甲醛法测定硝铵锌复混肥中的氨态、硝态氮含量 ,由氨态、硝态氮含量和尿素氮含量计算硝铵锌复混肥中的总氮含量的方法 ,此法简便、快速、准确 ,方法的精密度和准确度都较高 ,可用于生产过程控制分析。 相似文献
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尿素硝铵溶液中硝态氮和铵态氮不同测定方法的研究 总被引:1,自引:0,他引:1
《化肥工业》2016,(1)
尿素硝铵溶液是我国农业水肥一体化重点推广的新型肥料,其中硝态氮和铵态氮的含量是检测产品质量的重要指标。采用高效液相色谱法和紫外分光光度法测定尿素硝铵溶液中的硝态氮含量,采用蒸馏后滴定法和甲醛法测定铵态氮含量,探讨了尿素硝铵溶液中硝态氮和铵态氮不同测定方法的差异。试验结果表明:采用高效液相色谱法和紫外分光光度法测定硝态氮含量均可获得较好的精密度,2种测定方法除对UAN-Ⅲ样品的检测结果有显著性差异外,其余无显著性差异;采用蒸馏后滴定法测定铵态氮含量比理论值平均偏高0.45%,采用甲醛法测定铵态氮含量的准确度更高。 相似文献
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硝铵料浆法生产复合肥(15-5-25)产品的生产控制 总被引:1,自引:0,他引:1
说明在用硝铵料浆、磷酸、硫酸铵、硝酸钾生产复合肥 (15 5 2 5 )产品 (硝态氮要求 >5 0 % )的过程中 ,怎样控制以达到最大限度地减缓设备、管道结疤结块 ;维持系统热平衡 ;最大限度降低 KNO3消耗。指出操作关键是降低干燥温度 ,利用 130~ 140℃热硝铵溶液 ,尽量增加硝铵溶液加入量 ,加入适量硫酸 ,维持系统热平衡 ;硫酸适宜加入量 5 5~ 6 5 kg/ t产品 ,造粒机出口物料 n(N) / n(P)控制 0 .9~ 1.1,硝酸钾消耗可降到 2 0 0~ 2 2 0 kg/ t产品 ,生产可在优化情况下运行 相似文献
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阐述了云峰分公司针对硝铵的改性自主研发的全熔融法生产高浓度硝铵磷复合肥(30-10-0)的生产技术,对生产原理、工艺流程、工艺参数、生产进展,以及技术开发过程中的设备改造等方面作了总结。在硝铵改性生产高浓度硝铵磷产品开发过程中,进行了技术创新,采用低共熔体配方对硝铵改性,在不添加阻爆剂的情况下通过国家抗爆检测试验;进行了设备创新,应用了差动双速旋转造粒机,实现了在高44 m硝铵造粒塔中生产高浓度复合肥。该技术优势明显,产品w(总养分)≥40%,w(硝态氮)/w(总氮)≥46%,质量优于国内同类产品;效益好,仅投资314万元,可增加利润4 096万元。 相似文献
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针对磷酸二铵生产过程产品总养分含量的波动,结合生产过程分析结果,阐述了快速调节磷酸二铵产品养分含量的方法。对养分含量超标(w(总养分)64.3%)情况,采用加入硫酸或磷酸一铵渣,以及提升产品水含量的方法降低养分含量;对养分含量低(w(总养分)63.9%)的情况,采用降低产品水含量,或调节N、P质量比的方法提升总养分含量。两种方法皆可快速、有效地使磷酸二铵产品w(总养分)接近64.0%。 相似文献
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烟气脱氮技术现状及展望 总被引:1,自引:0,他引:1
氮氧化物是大气主要污染物之一。近年来,烟气脱氮技术的研究一直是环保领域的新技术前沿研究热点之一。由燃煤而产生的大量低浓度NOx烟气是导致大气污染、酸雨和光化学烟雾危害严重的主要原因。研究烟气脱氮具有十分重要的意义。目前主要的烟气脱氮技术有选择性催化还原法、非催化选择性还原法、等离子体活化法、生物法以及微波法等。 相似文献
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在修复工程中,利用微生物处理高浓度氨氮废水.通过对填埋场渗滤液坑底活性污泥驯化,筛选出复合菌剂,在异养硝化培养基或基坑废水中培养25 d后,氨氮平均质量浓度从830.42 mg/L降至38.28 mg/L,去除率最高达95.4%;总氮平均质量浓度从930.03 mg/L降至330.68 mg/L,去除率最高达66.2%... 相似文献
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在造气炉传统工艺设计基础上,采用小加氮的工艺操作方式取代大加氮操作方式,用于稳定造气炉炉温,达到稳定造气炉运行、提高单炉发气量的目的.采用小加氮操作方式之后,单炉发气量提高50~100 m3/h(标态),吨氨原料煤消耗下降20~40 kg. 相似文献
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S. Mahimairaja N. S. Bolan M. J. Hedley A. N. Macgregor 《Nutrient Cycling in Agroecosystems》1990,24(3):141-148
Kjeldahl nitrogen (N), total N and forms of inorganic N (ammoniacal (NH4)-N, nitrate (NO3)-N and nitrite (NO2)-N) were measured in a range of animal manures. The manures include fresh samples of poultry manure, sheep manure, horse manure, dairy slurry and pig slurry and composted poultry manure. Kjeldahl N was measured by standard micro-Kjeldahl digestion. For total N measurements, NO3-N and NO2-N were recovered during Kjeldahl digestion by pretreatments with various oxidizing and reducing agents. Inorganic forms of N were measured by extraction with 2M KCl solution.Kjeldahl digestion alone allowed measurement only of organic N and NH4-N. Amongst various modifications to the Kjeldahl, pretreatment with either acidified (H2SO4) Zn-CrK(SO4)2 or acidified (H2SO4) reduced Fe achieved complete recovery of NO3-N. Nitrite N was only recovered by first oxidising the NO
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to NO
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with KMnO4 followed by reduction to NH4-N with acidified (H2SO4) reduced Fe.More than 95% of the total N in fresh animal manure was present as organic N and NH4-N which were recovered by the standard Kjeldahl digestion. In the case of fresh manures there was no difference between the amount of total N measured by the Kjeldahl digestion and its modified methods. However composting of poultry manure or drying of poultry manure, pig slurry and dairy slurry resulted in an increase in NO3-N which was not recovered during Kjeldahl digestion alone. Under these conditions the total N could be measured by pretreating the samples with KMnO4 and reduced Fe prior to Kjeldahl digestion.Drying of animal manures caused a decrease in organic N and NH4-N, especially in poultry, pig and dairy manures. There was a slight increase in NO3-N; but most of the decrease in N content with drying was attributed to the volatilization loss of ammonia (NH3). Amongst various drying methods examined air drying caused maximum loss of N as NH3 whereas freeze drying caused minimum loss of N. This suggests that fresh animal manures can be freeze dried for analysis of N which causes minimum loss of N. 相似文献
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Nitrogen was chemisorbed on a ruthenium black catalyst by a plasma discharge of N2. Temperature-programmed desorption of nitrogen showed a broad peak at around 300 °C which showed a dependence on the duration and the wattage of the discharge. The chemisorbed nitrogen species was reacted with hydrogen to form NH3 even at room temperature. 相似文献
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A. A. Konnov 《Combustion, Explosion, and Shock Waves》2008,44(5):497-501
The measurements of NO concentrations in the post-flame zone of different hydrocarbon + O2 + N2 flames at standard temperature and atmospheric pressure available in the literature are compared with predictions of the
original Konnov reaction mechanism and with the same mechanism extended by the reaction of C2O with N2. The goal was to investigate the possible role of this reaction proposed by Williams and Fleming [Proc. Combust. Inst., Vol. 31 (2007), pp. 1109–1117]. This new reaction of C2O with N2 seems to be a reasonable explanation of the deficiencies in the prompt-NO route. Direct comparisons of the experimental measurements
performed in different flames with the modeling strongly suggests that the upper limit of this reaction rate constant is k = 7 · 1011 exp(−17,000/RT) [cm3/(mole · sec)].
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 5, pp. 3–7, September–October, 2008. 相似文献