氯化钾低温槽式转化生产硫基三元复合肥设计及生产总结

介绍平化公司氯化钾槽式低温转化生产硫基氮磷钾复合肥工艺的设计和生产中存在的问题及解决办法 ,2 0 0 0年试生产 1年销售产品 1.2 8万吨 ,获销售利润 2 0 4.6万元     

Amelioration of SO2 stress under fertilizer regime in a vegetable crop

Urea, superphosphate and potash fertilizers have been used as a nitrogen (N), phosphorus (P) and potassium (K) source of mineral nutrients to recover the SO₂ stress in three varieties: Parbhani Kranti, Anamika and Pusa Sawani of a common vegetable crop, A. esculentus (L.). Thirty‐day SO₂ exposed crop has been treated with recommended dose of fertilizers individually and in combination. Leaves of 60 days old plants were assessed by the few physiological parameters and compared with untreated plants. Results point out that fertilizer like urea, potash bears high potential of recovery than super phosphate in comparison to untreated ones.     

输送带热硫化胶接技术的应用

由于尿基复合肥的生产环境差,原料及半成品的输送皮带接口易开裂。传统的冷粘接工艺,粘接强度差;采用热硫化胶接技术可使粘接强度达原胶带的75%～90%,皮带寿命大大提高,既节约成本,又提高了装置开车率。介绍热硫化胶接接头尺寸的确定,硫化胶接程序,热硫化技术(温度、压力、时间的控制)。     

互穿网络型高分子.NPK缓释化肥的研究

介绍了将尿素和磷酸二氢钾的缩聚物与脲醛反应,以合成一种互穿网络型高分子NPK缓释化肥的实验。研究评价了该缓释化肥的缓释性能以及合成中尿素和磷酸二氢钾的摩尔比、反应温度、甲醛的加入量对缓释性能的影响。研究结果表明:该缓释化肥中N的缓释期>120 d,P的缓释期为80~100 d,K的缓释期为70~90 d。     

尿基复合肥K-T工艺技术分析

介绍尿基复合肥K T技术工艺流程;通过造粒、系统温度控制、缩二脲含量控制、重钙的氨化、除尘洗涤系统、配料系统等方面的技术特点、操作控制要点的分析,指出K T工艺生产高氮复合肥的突出优势。     

防止复合肥结块采取的技改措施

分析复合肥结块原因及采取的技改措施:筛分后利用流化床冷却进一步降低包装温度;提高喷浆造粒干燥机机尾温度,降低产品的水分;增加产品分级筛网,生产1.5~2.5 mm、2.5~3.5 mm、3.5~4.5 mm 3个等级的复肥产品,提高产品粒度的均匀性;增加包膜机对复合肥进行防结块处理,提高磷矿石品位等,从而有效解决了硫基复合肥的结块问题。     

低温转化氯化钾生产硫基氮磷钾复合肥

介绍低温转化氯化钾生产硫基氮磷钾（Ｓ－ ＮＰＫ）生产工艺。该工艺把ＫＣｌ转化、磷酸与Ｓ－ ＮＰＫ生产有机结合;用喷浆造粒干燥机把造粒、干燥及大部分返料返回在一个设备中完成。产品品位为１２－ １８－ １５。本文详细介绍工艺流程、工艺控制条件、技术经济测算。该产品成本低,产品价格降到１ ５００ 元／吨,仍可获得一定经济效益,２～３ 年可收回投资,有相当的市场竞争力。     

磷矿资源加工研究进展：5．利用磷铁尾矿直接生产复合肥的MUSP新工艺

介绍用磷铁尾矿、硫酸、尿素直接加工成含有缓释作用的氮磷钾硫多元粒状复合肥,没有磷石膏排放。该工艺可处理反应活性较低的磷矿。产品对水稻、花生、玉米等作物经大田试验,获得较好的增产效果。产品经XRD物相分析,尿素与石膏形成了新结构,尿素降溶,石膏增溶,是一种具有较好应用前景的新复合肥料。     

我国氮磷钾养分与合理施肥技术的研究

介绍我国近30年氮磷钾养分资源的研究状况,对氮磷钾在生态系统循环、合理使用及土壤硝态氮的积累等方面研究成果进行综述,提出今后养分资源研究的建议.     

Cadmium concentration in vegetable crops grown in a sandy soil as affected by Cd levels in fertilizer and soil pH

Field trials were conducted over a three-year period with chinese cabbage (Brassica pekinensis Rupr.) and carrots (Daucus carota L.) grown in a sandy soil with pH adjusted to 5.5 and 6.5. The NPK fertilizers containing 1, 30, 90, and 400 mg Cd kg^–1 P were applied at the rate of 0.07, 2.1, 6.3 and 28 g Cd ha^–1 yr^–1. The amounts of Cd added through phosphate rock also ranged between 0.1 and 28 g ha^–1 yr^–1. The increased Cd application rates through NPK fertilizers increased the Cd concentration in both vegetables but the differences among treatments were not found to be significant. The Cd uptake by both crops was significantly (p<0.01) higher at pH 5.5 than at pH 6.5. Chinese cabbage exhibited lower Cd concentration than carrots. Carrot leaves contained higher Cd than its roots. Cadmium removals by chinese cabbage and carrot were about 0.7 and 1.3 g ha^–1 yr^–1, respectively. At pH 5.5, Cd concentrations in the two crops, based on a three-year average, were 23 and 46% higher than at pH 6.5. Cadmium uptake by chinese cabbage from different sources of phosphate rock was affected to a very limited extent. Cadmium concentration generally increased over the years. Cadmium extracted by ammonium nitrate after harvest of the crops was closely related with soil pH and Cd concentration in the plants.