a red or yellow or brown mineral; an oxide of iron that is a common constituent of rust 同义词：gothite,
例句与用法
1.
Some main results of testing research were as fellows : i . in the course of testing of leaching zinc dross , leaching zinc dross by sulfuric acid was researched and the effects on the leaching rate of the zinc dross were analyzed by author , the optimum conditions of leaching testing of zinc dross were determined as fellows : liquid - solid ratio 6 : 1 , stirring ratio 250r / min , granularity 120 mesh , the soaking time 5h , the concentration of sulfuric acid of 30 % , and under these conditions , the rate of leaching zinc is above 92 . 0 % . ii . in the course of testing of purification , on the basis of comprehending and comparing all present methods of the manganese - removal and iron - removal , the oxidizing method of manganese - removal in zinc sulfate solution using ammonium persulfate was put forward and the oxidizing method of iron - removal in zinc sulfate solution using the goethite process and oxidation - hydrolysis process was adopted 研究的主要结果具体如下： 1 、研究了硫酸浸出锌浮渣并分析了影响浸出率的各种因素，确定了浸出锌浮渣的最佳条件为：液固比为6 ： 1 ，搅拌速度为250r min ，粒度为- 120目，酸浸时间为5 . 0h ，硫酸浓度30 ，锌浮渣的浸出率大于92 . 0 ； 2 、在综合和比较了目前除锰和除铁的各种方法基础上，提出了过硫酸铵氧化除锰方法和选择了针铁矿-氧化水解联合法除铁方法，并分析和讨论了影响除锰率和除铁率等各种因素，确定了除锰的条件为：温度90 ， ph值5 . 4 ，反应时间3h ，过硫酸铵达到理论值的1 . 2倍，除锰率超过99 . 86 ；联合法除铁的条件为：氧化反应时间1 . 5小时、温度控制在90 92 、 ph值5 . 2 5
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