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Selective reduction roasting ; ammonia leaching ; nickeliferous laterite ore ; nickeliferous iron ore ; nickel and cobalt extraction

选择性还原烧;氨浸;低品位红土镍矿;镍铁矿;镍钴提取

A series of niobic acids at different calcination temperatures was prepared.

在不同烧温度下制备了一系列固体铌酸催化剂。

The nitration of toluene was carried out in the presence of acetic anhydride with CCl4 as solvent, 95% nitric acid as nitrating reagent, and niobic acid calcinated at 300℃ for 3 h as catalyst for 60 min at 40℃.

实验结果表明,当反应温度为40℃,反应时间为60min时,以CCl4为溶剂,以质量分数为95%的硝酸为硝化剂,在醋酐存在条件下,以经300℃烧3h后的铌酸作为催化剂,甲苯硝化产物中异构体的邻对比达1.26,较硝硫混酸的1.67显著降低,产物得率达99.3%。

The effects of all kinds of factors, just like calcination temperature of niobic acid catalysts, nitration reaction time, nitration reaction temperature, recovered catalyst, acetic anhydride and concentration of nitric acid were studied by gas chromatography.

研究了催化剂烧温度、硝化反应时间、硝化反应温度、有无醋酸存在、硝酸浓度、催化剂的重复使用等因素对甲苯硝化反应影响。

The magnetic ore separator is suitable for granularity material and so on 3mm following magnetite, pyrrhotite, roasting ore, ilmenite wet magnetic dressings, also uses in materials and so on coal, nonmetalliferous ore, building materials eliminates the hard work.

磁选机适用于粒度3mm以下的磁铁矿、磁黄铁矿、烧矿、钛铁矿等物料的湿式磁选,也用于煤、非金属矿、建材等物料的除铁作业。

"It is 150-200 times as sweet as cane sugar and is used as a nonnutritive tabletop sweet ener and in low-calorie prepared foods but is not suitable for baking."

甜度是蔗糖的150~200倍,作为非营养的桌上加甜剂,也用于低卡路里制备食物(商标名为NutraSweet和怡口健康糖),但不适合用于烘

"It is 150-200 times as sweet as cane sugar and is used as a nonnutritive tabletop sweetener and in low-calorie prepared foods but is not suitable for baking."

甜度是蔗糖的150~200倍,作为非营养的桌上加甜剂,也用于低卡路里制备食物(商标名为NutraSweet和怡口健康糖),但不适合用于烘

The Change of hot strength of iron ore pellets during oxidizing roasting and reduction was researched.

研究了球团矿在氧化烧和还原过程中抗压强度的变化规律。

According to the evaluate and the sift through light paraffine isomerization catalyst,It showsthat preparated Pt-SO_4~(2-)/ZrO_2-Al_2O_3 catalyst achieved superior activity under the condition thatthe calcination temperature is 650°C、 concengtration of SO_4~(2-) is 0.5mol/L、 the content ofAl_2O_3 is 30% and content of Pt is 5%.

通过对轻质烷烃异构化催化剂的评价与筛选,表明所制备的 Pt-SO_4~(2-)/ZrO_2-Al_2O_3 催化剂在烧温度为 650°C 、SO_4~(2-)浓度为 0.5mol/L、第二金属氧化物组分 Al_2O_3含量为 30%,金属 Pt 含量为 0.3%时,该催化剂用于异构化反应效果最佳。

Pillared interlayered clay catalyst has been prepared by titration, over which DPC yield is 9.08%. Influence of OH7Pb2+, temperature of pillaring process and calcination temperature on the activity of catalyst has been studied.

用滴定法制备了层柱型催化剂,考察了OH~-/Pb~(2+)值、插层反应温度及烧温度对催化剂性能的影响,优化了催化剂制备条件。

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