铬

Chrome-tanning process is still very important in leather industry for its special tanning properties.This process can produce some chrome effluent and chrome-tanned leather scraps,the reject of which not only can contaminate the environment but also can cause great economic losses.

铬鞣因其优异的鞣制性能，在制革工业中仍占据着重要地位，但由铬鞣产生的各种污染如铬鞣废液、铬鞣革屑等对环境具有极大危害，这些废液及材料的直接排放和丢弃，还会造成很大的经济损失。

The results show that the shrinkage temperature of the leather tanned with QUIMITAN ABC is 101.4℃, and the physical-mechanical properties of QUIMITAN ABC tanning leather are better than that of chrome powder tanning leather; the content of Cr2O3 (0.4142 g/L) in the float of QUIMITAN ABC tanning is lower than that of the content of Cr2O3 (1.9481 g/L) chrome powder tanning, it's clear that QUIMITAN ABC tanning is good for Cleaner production; under the same content of chromic oxide, the physical properties of retanning leather with QUIMITAN ABC are better than that of retanning leather with chrome containing sytan and chrome powder, such as thichkening, flexibility, physical-mechanical properties.

结果表明：QUIMITAN ABC主鞣后的坯革的收缩温度为101.4℃，且其坯革物理力学性能高于用6%的铬粉主鞣后的坯革；QUIMITAN ABC主鞣后的废液Cr2O3含量(0.4142 g/L)明显低于用6%的铬粉主鞣后废液Cr2O3含量(1.9481 g/L)，用QUIMITAN ABC主鞣有益于清洁化生产；在Cr2O3含量相同的情况下，用QUIMITAN ABC复鞣的坯革在增厚率、柔软度、物理力学性能等方面都要好于含铬鞣剂及铬粉复鞣的坯革。

Collagen has been treated with DHTPA and then tanned with chromium complexes,and the effect of DHTPA on chrome tanning properties has been investigated by determining the chrome absorptivity and fixation as well as the physical properties of the crust.

用DHTPA对胶原改性后进行铬鞣，通过铬的吸收率、铬的固定率、坯革物理机械性能等指标的测定，研究了DHTPA对胶原铬鞣性能的影响。

Results indicate that pH of goat bated hides can be adjusted to fit chrome tanning, hides will not be acid swollen and chloride is completely canceled.

结果表明：5%明矾预处理120min即可使软化裸皮的pH调整至适合于铬鞣，且不会酸肿，完全削减了Cl的使用；再用5%铬粉鞣制4h，皮Ts达102℃；鞣制废液中的BOD5、COD分别减少了55%和63%，废液中的铬浓度也得以降低，铬吸收率达91%。

The high exhaustion chrome tanning mechanism of ECPA auxiliary was explored by means of investigating the interaction among the auxiliary,collagen and the chrome tanning agent.

通过研究大分子铬鞣助剂ECPA与皮胶原、铬鞣剂间相互作用以及ECPA助鞣的革坯铬结合牢度，探讨了ECPA的高吸收铬鞣机理。

It is feasible to produce yellow chrome by using the leachate of chrome slag.

由铬渣中提取的六价铬的方法和试验的影响条件，通过研究证明了利用铬渣淋滤液制取铬黄颜料的可行性。

The residual Pb2+ can be removed by phosphorite to avoid bringing new pollution.(3) It is feasible to produce yellow chrome by using the leachate of chrome slag.

由铬渣中提取的六价铬的方法和试验的影响条件，通过研究证明了利用铬渣淋滤液制取铬黄颜料的可行性。

In this research, the concentration of PbCrO4 in the reaction can be as low as 58g-L-1 without any ill influence on the experiment. Therefore, some leachate can be used to produce yellow chrome directly without concentration.

乙酸铅或硝酸铅与代替重铬酸钠溶液的铬渣滤液反应时，其用量应高于理论值，大约为理论值的1.10～1＊倍，才能使六价铬充分反应，使生成的铬黄量达到最大值。

The eluviation experiment of the two-stages column filled with steel slag farther showed this process can be used as the pretreatment stage of chromium-containing wastewater treatment in industry.

结果表明，经硫酸亚铁还原处理后再用钢渣处理比单纯用钢渣处理的效果明显提高，采用钢渣／总铬质量比为40的100目钢渣处理经硫酸亚铁还原后的含铬废水，总铬和Cr^6＋去除率分别达79％和84％，采用钢渣柱进行的两级淋滤实验进一步表明该方法可作为工业上含铬废水处理的预处理段。

The structures and the properties of nicotinate chromium and tripicolinate chromium are also characterized by means of molar conductance, infrared spectra, ultraviolet visible absorption spectra, thermal analysis.

通过电导率、红外光谱、紫外可见光谱和热分析对制备的有机铬的组成、结构和性质进行了表征、分析和对比，充分论证了利用镀铬废水制备有机铬饲料添加剂—吡啶酸铬的可行性，为镀铬废水的资源化开辟了新的途径。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。