Earlier, it was shown that the chromate-ion plays a special role in the process of high-temperature sulfuric acid leaching of iron-tearing laterite ores [1]. This paper looks into the conditions for its formation. At the Moa plant (Cuba), each stage in the leaching of laterite ore uses four series connected vertical reactors A, B. C, and D [2]. In order to study the kinetic laws governing the process, pulp samples were selected from reactors A, B, and D (see Sable). The concentration of Cr~(3+) in all the reactors in a stage is usually 0.04-0.06 g/l and has no tendency toward growth, since the Cr~(6+) concentration in the first two reactors increases significantly - in reactor B it is 1.3-1.5 tines higher than in A and, with respect to absolute value, it is 10-20 times higher than the concentration of Cr~(3+). An increase in concentration of Cr~(6+) after reactor B was found in individual cases - it usually stabilizes or even is reduced because of coprecipitation with the hydrolysis products (Fe~(3+), Al~3) [1].
展开▼
机译：较早的研究表明，铬离子在含铁红土矿石的高温硫酸浸出过程中起着特殊作用[1]。本文探讨了其形成的条件。在Moa工厂（古巴），红土矿石浸出的每个阶段都使用四个串联的垂直反应器A，B，C和D [2]。为了研究控制该过程的动力学规律，从反应器A，B和D中选择了纸浆样品（参见Sable）。一个阶段中所有反应器中的Cr〜（3+）浓度通常为0.04-0.06 g / l，并且没有增长趋势，因为前两个反应器中的Cr〜（6+）浓度显着增加-在反应器中B比A中高1.3-1.5齿，并且相对于绝对值，其比Cr〜（3+）的浓度高10-20倍。在个别情况下，发现反应器B后Cr〜（6+）的浓度增加-由于与水解产物（Fe〜（3 +），Al〜3）共沉淀，它通常稳定或什至减少[1]。
展开▼
