共查询到19条相似文献,搜索用时 192 毫秒
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复混肥生产装置改产脲甲醛缓释复合肥料的技术 总被引:1,自引:0,他引:1
利用转鼓蒸汽造粒或圆盘造粒复混肥生产装置改造并开发生产脲甲醛缓释复合肥。介绍脲甲醛的生产原理、反应条件控制和脲甲醛缓释复合肥的生产过程。尿素熔融喷浆工艺的转鼓蒸汽造粒复混肥装置改产脲甲醛缓释复合肥具有投资少、工期短、生产成本低于包膜控释肥等优点。该肥料中包含了速效、中效、长效的氮素养分.其氮素利用率可达50%,减少30... 相似文献
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介绍在传统转鼓造粒生产复肥的基础上 ,用尿素熔融液作为氮源及转鼓造粒的液相进行造粒 ,生产三元复肥的工艺路线、运行状况、工艺控制参数和产品指标。该工艺与传统转鼓造粒相比的最大特点是 :解决了传统法用尿素为氮源 ,使烘干温度和产品水分难以控制的困难 ,产量提高近 30 % ,成球率由 40 %~ 6 0 %提高到 70 %~80 % ,产品外观改善。但在生产中要妥善解决尿素浓溶液易结晶堵塞管道以及尿素在高温下易生成缩二脲的问题 相似文献
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硝酸铵易吸湿,结块,不易破碎,高温下易发生爆炸,以其为氮素原料掺混的高浓度复肥颗粒不均匀,不致密,外观欠佳。根据硝酸铵的物化性质和在水中的溶解度随温度降低而显著下降等特性,采用高温饱和溶液溶解,低温稀释溶液喷浆的全溶造粒工艺,可制得15-15-15低氯三元复肥。全溶造粒的工艺条件是:控制硝酸铵在反应器中的温度为120℃,W(NH4NO3)=95%,硝酸铵溶液的喷浆造粒温度75 ̄80℃,W(NHNO 相似文献
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分析我国高浓度复合肥生产工艺中的几种氨化造粒技术特点,重点介绍稀磷酸氨化造粒生产高浓度复合肥新工艺及该工艺在节能降耗方面的优势,稀磷酸氨化造粒生产高氮高浓度复合肥比传统的转鼓造粒工艺原材料成本节约87.5元/t,产品干燥能耗可降低30%。 相似文献
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D. Caccavo P. Apicella G. Lamberti A. A. Barba 《Chemical Engineering Communications》2017,204(12):1333-1340
One of the main aims in agriculture is to guarantee soil wellness, which is a fundamental requirement to produce high-quality crops with high yields. Focused on this aim, periodical administrations of nutrients or phytostrengtheners are often necessary. The most relevant disadvantages of these administrations are the high dosage number required and the low availability of the substance within the soil. For these reasons, a crucial goal to increase the economic and environmental sustainability of the cultivation process is to reduce the dosage number, which can be obtained increasing the active substance availability in the soil. A granular hydroxypropyl methylcellulose (HPMC) matrix, produced using the wet granulation process, was used to encapsulate a phytostrengthener and to guarantee its controlled release. The granular product was characterized in terms of granules properties and phytostrengtheners leaching within the soil. The results showed good flowability and mechanical properties of the granules as well as the possibility to reduce the product leaching with the phytostrengtheners encapsulation in the HPMC matrices. 相似文献
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Sulfur/sodium bentonite prills containing 5–40% of sodium bentonite were evaluated in a field experiment to determine the effects of the bentonite contents on their ability to supply sulfur to pasture plants. Comparative rates of oxidation of the elemental sulfur in the fertilizers to sulfate were deduced from plant sulfate contents and phosphate-extractable sulfate in soil (0–75 mm depth) over a period of 15 months. In grass-dominant pastures plant sulfate appeared to be more sensitive than soil sulfate to differences between S fertilizers.Increasing the proportion of bentonite in the prills from 5% to 40% increased the rate at which sulfur became available for plant uptake. At least 10% bentonite content was necessary to allow a satisfactory rate of supply to plants in the first year after application. Plant sulfate concentrations were increased by the S°/bentonite treatments for the whole of the experimental period of 467 days. In contrast gypsum only increased plant sulfate levels for about 118 days. Prills containing 40% bentonite also maintained sulfate concentrations longer than did finely divided elemental S. However oxidation of S from S°/bentonite prills lagged behind elemental S powder of similar fineness due to the delay for prill disintegration and less uniform distribution of S.In a cool-temperate climate with sufficient rainfall for significant leaching of sulfate, the optimum bentonite content of S°/sodium bentonite prills as fertilizer for pasture was about 15%. 20% sodium bentonite may be more appropriate in dry cool-temperate environments, whereas in warm moist temperate environments prills containing 10% sodium bentonite may be satisfactory. 相似文献
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E. Humphreys P. M. Chalk W. A. Muirhead R. J. G. White 《Nutrient Cycling in Agroecosystems》1992,31(2):221-234
Dry-seeded rice is often fertilized by broadcasting prilled urea on the soil surface shortly before permanent flood commences. Although this method is more efficient than nitrogen application at other stages, nitrogen loss is still substantial (up to 40%). Therefore we compared the efficiency of broadcast urea prills with various forms of urea banded below the soil surface shortly before permanent flood.Banding urea prills increased plant recovery of applied15N from 37% (broadcast) to 46% (banded), while recovery with point-placed urea supergranules was even higher (49%). Plant recovery from banded urea treated with DCD (dicyandiamide) or PPD (phenylphosphorodiamidate) was not higher than from banded urea prills. Loss of applied15N averaged 25%, with no significant differences between treatments. The increased plant nitrogen recovery with banding was associated with reduced immobilization of15N in the soil, rather than reduced losses. The increase in plant nitrogen recovery was relatively small compared with total nitrogen uptake by the plants, and consequently there was no significant improvement in yield or agronomic efficiency.There are practical difficulties associated with banding before permanent flood. When the soil is too wet, unacceptable amounts of soil disturbance and plant damage occur. On the other hand, when the soil is dry and cracked, the depth of banding is no greater than the depth to which broadcast urea prills are transported by the irrigation water at the commencement of permanent flood. 相似文献