铬的

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。

The concentration of sodium bichromate (Na2Cr2O7) in the reaction of synthesizing yellow chrome need not to be as high as 150~250gL-1, which is asserted by predecessors.

本试验中使用的淋滤液 NdiCtZO7浓度最低可达到 589·L＼因此，一些浓度较高的铬渣淋滤液可不必经过浓缩而直接作反应物制取铬黄。

The compound roll is centrifugally cast with high Cr cast iron as outer material, and nodular iron as thematerial of its core and neck.

离心铸造高铬铸铁-球铁复合轧辊以w12%～22%的高铬白口铸铁作为辊身外层材料，以高强度的球墨铸铁作为芯部和辊颈材料，采用离心复合浇注工艺生产。

With only 2% chromium powder, the nano-composite tanning agent can thicken the leather by 124.5%, the shrinkage temperature reaches to 95 DEG C.; compared with a chrome tanned leather, a leather tanned by the nano-composite tanning agent has a tensile strength, peeling strength and elongation at break improved by 51.8%, 8.2% and 13.3% respectively, has no obvious stratification or sedimentation during over 12 months of storage period.

所述复合鞣剂只需配入2％的铬粉，就可使皮革增厚高达124.5％，收缩温度达到95℃以上；其鞣革相较于铬鞣革，革的抗张、撕裂强度分别提高了51.8％和8.2％，断裂伸长率也提高了13.3％，存放期12个月以上无明显分层和沉淀。

Compared with ferrous sulfate deoxidization method, lead chrome yellow production technology was fitter to the production requirements of enterprises. It not only treated the pollution of heavy metals, but also it reclaimed and utilized lead and chrome resources, and it reduced or avoided the secondary pollution, which could gain good economic benefit and social benefit.

铅铬黄生产工艺与硫酸亚铁还原法相比更适合企业的生产需要，不仅治理了重金属污染，同时回收到利用了铅、铬资源，减免了二次污染，取得了良好的经济效益和社会效益。

The major difficulty that I have experienced with Cr is that it often exists in forms that are difficult to put into solution. Chromite FeO.

处理铬时我所遇到的最大困难就铬通常都以难以形成溶液的形式存在。

In this paper, the detoxication mechanism and technological process of utilization of chromium residue as cement mineralizer were introduced.

介绍了铬渣作水泥矿化剂的解毒原理和工艺处理过程，从理论和实践两个方面阐述了铬渣作水泥矿化剂的可行性。

The conclusion of this study was that potassium dichromate has obvious teratogenic effect on Zea mays L.

因此，重铬酸钾对玉米根尖细胞具有明显的致畸效应，在一定范围内可以指示环境中重铬酸钾的污染程度。

Pollution could be reduced by taking advantage of ion-exchange membrane electrolytic method to produce sodium dichromate.

为从源头解决铬盐生产中环境污染的问题，亟需探索清洁高效的重铬酸钠生产技术。

Potassium dichromate was chosen as the pollutant and its initial concentration was 100mgkg^(-1) kaolin.

选用重铬酸钾作为污染物，配制的高岭土的重铬酸钾质量分数为100mgk^(-1)。

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％。