Characteristic iron ores and trivalence iron minerals were found in sulfide mining areas in which coexists a lot of toxic elements .

金属硫化物矿山中具有特征的 含铁矿石，以及 高 铁 次 生产 物， 这些 含铁矿物中伴随了大量有害元素。

The application of trivalence chrome beforehand intermediary waste-water recycle for sapanwood dyeing silk

三价铬预媒废水回用法在苏木精染真丝绸上的应用

Through the adjust of the vitriol-chrome-acid and trivalence chromic can from the net contain additive common chromeplate liquid gain wide bright electric current density bound ;

通过对硫酸铬酸比和 三价铬的认真调整，能从不含添加剂的普通镀铬液获得宽的光亮电流密度范围；

In addition the valence state of chromium in the acetylacetone chromium salt was changed from trivalence to divalent .

此外乙酰丙酮铬盐中的铬元素价态由 三价转变成二价。

Calculation of Cohesive Energy of Metals of Trivalence Actinides

三价锕系金属结合能的计算

XRD patterns showed that the cathode material is well-crystallized homogeneous olivine-type phase with only tiny trivalence iron impurities .

结果表明，所合成的材料结晶完整，为均一橄榄石型结构，仅 含 少量 三价铁杂质；

We studied trivalence chromium ion electrode reaction on three different surface state by cyclic voltammetry discussed electrode activation influence on electrode reaction and analysed the mechanism of electrode reaction .

应用循环伏安法考察了 三价铬离子在三种不同表面状态 石墨电极上的电极反应，探讨了电极表面活化 处理对 三价 铬离子的电极反应的影响，并分析了电极反应的机理；

According to thermomechanical analysis in basis theoretical research it is said that vanadium of quadrivalence and trivalence coexist in leach liquor and the influence factor of the leaching process can be worked out based on correlation kinetic equation .

由浸出基础理论研究中的热力学和动力学分析可知，浸出液中的钒是五价为主四价和 三价伴存。