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goethite n.【礦物】針鐵礦。

goffer

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 研究的主要結果具體如下: 1 、研究了硫酸浸出鋅浮渣并分析了影響浸出率的各種因素,確定了浸出鋅浮渣的最佳條件為:液固比為6 : 1 ,攪拌速度為250r min ,粒度為- 120目,酸浸時間為5 . 0h ,硫酸濃度30 ,鋅浮渣的浸出率大于92 . 0 ; 2 、在綜合和比較了目前除錳和除鐵的各種方法基礎上,提出了過硫酸銨氧化除錳方法和選擇了針鐵礦-氧化水解聯合法除鐵方法,并分析和討論了影響除錳率和除鐵率等各種因素,確定了除錳的條件為:溫度90 , ph值5 . 4 ,反應時間3h ,過硫酸銨達到理論值的1 . 2倍,除錳率超過99 . 86 ;聯合法除鐵的條件為:氧化反應時間1 . 5小時、溫度控制在90 92 、 ph值5 . 2 5