查询词典 sulfuric acid

By analyzing principle, the investigating project was primarily determined. Then experiments of leaching with hot water, precipitation arsenic by lime milk, solution arsenic by sulfuric acid, reduction, cooling and crystalling white arsenic have been carried out and the optimum conditions of every step have been obtained.

在分析基本原理的基础上，初步确定了研究方案，按照方案分别进行了热水浸出、石灰乳沉砷、硫酸溶砷、还原、冷却结晶白砷等试验，得到了各个工序的最佳工艺条件。

Pretreatment of arsenical refractory gold concentrate - Leaching by sodium dichromate ;2. The solution of sulfuric acid was added dropwise to the reaction vessel contained 1,3-dichloro-2-propanol, sodium dichromate and water.

将硫酸水溶液滴加到1，3-二氯-2-丙醇与重铬酸钠水溶液的混合物中，在温度23~27℃的条件下搅拌反应5 h，重铬酸钠∶1，3-二氯-2-丙醇=1∶2，此条件下收率为79。

This article provides the synthesis methods of high purity Arsine by arse nic,zinc and sulfuric-acid.

介绍了用砷、锌和硫酸合成高纯砷烷的方法，产品纯度为99.995%，总收率为85%。

Key words: sulfuric acid by sulfur burning; low conversion rate; reason analysis; atmolysis odds; total loading amount

硫磺制酸；转化率低；原因分析；分气不均；总装填量

Electroplating equipment: Sun card rectifiers, magnetic polishing machine, distressed temperature magnetic stirrer, heated ultrasonic cleaning machine, a sulfuric acid content of analyzer, Germany plating color separation machine, atomic absorption spectrometer and experimental real instrumentation.

四、电镀设备：太阳牌整流器、磁力抛光机、怛温磁力搅拌器、加温超声波清洗机、硫酸含量测定仪、德国电镀分色机、原子吸收光谱分析仪及实验实仪器仪表等。

In the reaction of substituted arylamine and sulfuric acid, and utilizes the feature of that said inert organic solvent is easy to form azeotrope with water to continuously deliver the water produced in the couse of reaction from the reactor.

本发明在取代芳胺与硫酸的反应中加入了一种惰性的有机溶剂，如：氯苯，二氯苯，三氯苯，硝基苯等，利用其易与水形成共沸物的特点，将反应生成的水不断地导出反应器。

Because the batch feeding of aspect both response is very quick, therefore after should respond the pot first preheating, gets ready the materials again, causes beginning of the sodium bichromate and the sulfuric acid contact responded immediately.

投料方面由于两者反应很快，故应先将反应锅预热后再投料，使重铬酸钠和硫酸接触之始迅即反应。

A phenol sulfuric acid method for determination of soluble carbohydrates in seawater bittern was established,and the optimal conditions of this method were studied.

建立了一种海水苦卤中可溶性糖的测定方法。

Zinc sulfate was produced in process of soaking blende with sulfuric acid of high concentration in oxygen and at normal pressure.

研究了在常压、通氧条件下，用浓硫酸浸取闪锌矿制取硫酸锌时酸浸条件对锌浸取率的影响。

Soil drenching with 0.5% potassium permanganate or 0.4% sulfuric acid at the rate of 6-12 liters per square meter of seed-bed applied one week before planting in combination with foliage-spraying with 0.4—0.8% Dithane Z-78 or 0.6—1.0% Bordeaux mixture results a satisfactory control of the disease.

在播种前一周用0.5％高？酸？或0.4％硫酸作土壤消毒和在苗期用0.4—0.8％的代森？或0.6—1.0％波尔多液药剂？？雾有一定防治效果。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。