查询词典 sulfuric

Effect of magnetic field and dichromate on anodic polarization behavior of iron in sulfuric acid .

重铬酸根与磁场对铁在硫酸溶液中阳极极化行为的影响。

To restore the ability of chromium can be dissolved in sulfuric acid, hydrochloric acid and High-FE acid and release hydrogen, but also of pure chromium with aqua regia does not work, when there is the presence of halogen ions in the acid can not be long-term stability, high temperature with alkali, hydrogen sulfide, sulfur steam, phosphorus, ammonia, such as carbon monoxide and water vapor reaction of the corresponding compounds, in the high temperature reaction of silicon into the silicide also chromium, chromium alloys with many metals generate a wide range of industrial applications, such as chromium-manganese stainless steel is used extensively for chemical plants.

铬的还原能力强，能溶于硫酸、盐酸和高FE氯酸而放出氢气，但纯铬连王水也不起作用，当有卤素离子存在时，在酸中不能长期稳定，高温时能与强碱、硫化氢、硫蒸汽、磷、氨、一氧化碳和水蒸汽等反应生成对应的化合物，在高温下还能与硅反应成硅化铬，铬能与许多金属生成合金广泛在工业上应用，如铬锰不锈钢大量用于化工设备。

Results Under normal production conditions, concentration of sulfuric acid, hydrochloric acid, arsenic hydrogen and sodium hydroxide which could cause occupational hazardous accidents met the occupational exposure limits.

结果 在正常的生产条件下引起职业病危害事故的硫酸、盐酸、砷化氢和氢氧化钠的浓度符合职业接触限值。

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。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。