酸性镀锡中过量硫酸根的去除

酸性镀锡生产中随着SO2-4的积累,镀层光亮度降低,镀液带出损失增加。分别采用CaCO3、Ca(OH)2化学沉淀法去除溶液中过量的SO2-4,经赫尔槽试验和大槽处理,Ca(OH)2化学沉淀法效果良好。

对甲苯磺酸制备实验的改进

根据提高温度有利于对甲苯磺酸的生成以及对甲苯磺酸一水化合物能从稀硫酸中结晶出来的原理,采用浓硫酸过量,甲苯滴加到90～100℃的浓硫酸中反应,改进了对甲苯磺酸制备实验;改进的方法制备收率高,反应操作简单,更有利于实验教学.

Effects of Urea Ammonium Chloride of Different Fertilization Patterns on Maize Yield and Yield Components

[Objective] To understand the application effects of urea ammonium chloride fertilizer on maize production. [Methods] A field plot experiment was conducted to study the effects of urea ammonium chloride of different fertilization patterns on summer maize yield and yield components. [Results] Urea ammonium chloride had a long fertilizer effect and the same yield-increasing effect with urea, which could im- prove the agronomic traits and economic traits of maize apparently and the applica- tion of urea ammonium chloride with nutrient reduction of 40% （namely just use urea ammonium chloride equaled 60% pure nitrogen）, had the same yield-increasing effect with urea of traditional fertilization patterns, and input-output ratio was high and the economic benefit was remarkable. [Conclusion] To provide scientific theoretical direc- tion for large area popularization and application of urea ammonium chloride.

鲁棉研系列转基因抗虫杂交棉种子加工新技术研究

鲁棉研系列转基因抗虫杂交棉种子加工新技术系将传统过量稀硫酸脱绒技术(对照)的毛子剥3次短绒改为剥1次短绒,将燃煤系统改为燃油自动控温系统。研究表明,毛子剥1次短绒比剥3次短绒显著降低了破损率(降低2.47个百分点);燃油自动控温系统脱绒工段比燃煤供热系统的种子发芽率提高7.5个百分点、活力指数提高1.1、残酸率降低0.02个百分点、残绒率降低0.25个百分点;采用新技术加工后的转基因抗虫杂交棉薄膜包衣种子的发芽率平均为84.8%、活力指数为9.84、残酸率为0.10%,薄膜包衣种子、光子发芽率分别提高3.2、9.3个百分点,均达到了GB4407.1-2008的质量要求。

柠檬酸三甲酯的合成

本文对制备柠檬酸三甲酯的不同工艺方法进行了比较 。

芬顿处理低浓度络合态镍铬(Cr^(6+))铜混合电镀废水的小试研究

文章介绍了采用芬顿方法处理低浓度络合态镍铬铜混合电镀废水的研究,主要通过加热及酸化将铬转化为六价铬,利用过量硫酸亚铁将六价铬还原为三价铬去除,再加入双氧水与硫酸亚铁生成HO…,将废水中络合态镍铜转化成离子态镍铜去除。这是一种简单有效的工业废水的处置方法,能有效解决低浓度电镀废水的处置问题。