从低品位天然二氧化锰焙烧物萃取Mn(Ⅲ)制活性二氧化锰

A Study on Preparation of an Activated MnO_2 Based on Extraction of Mn(Ⅲ) from Roasted Natural MnO_2

研究从天然二氧化锰焙烧物萃取Ｍｎ（Ⅲ）制活性二氧化锰方法中其它过程的操作条件，包括从天然二氧化锰焙烧物中溶出Ｍｎ（Ⅲ）和从Ｐ２０４萃取液中反萃取Ｍｎ（Ⅲ），以及产品二氧化锰的形成条件。结果表明：用１０ｍｏｌ／Ｌ的Ｈ２ＳＯ４溶液能有效地从天然二氧化锰焙烧物中溶出Ｍｎ（Ⅲ）；而用４ｍｏｌ／Ｌ的Ｈ２ＳＯ４溶液于８０℃左右能有效地从Ｐ２０４萃取液中反萃取Ｍｎ（Ⅲ），Ｍｎ（Ⅲ）在Ｈ２ＳＯ４溶液中歧化成ＭｎＯ２；产品中ＭｎＯ２含量超过８０％，且具有很高的活性。

A method was proposed for the preparation of an activated manganese dioxide based on the extraction of Mn(Ⅲ) using P204 as an extractant. The extraction of Mn(Ⅲ) has been studied by the authors. Other processes in this method, such as the dissolution of Mn(Ⅲ), the fomation of activated manganese dioxide, ect. are studied in this paper. Results show that Mn(Ⅲ) in roasted natural manganese dioxide can be dissolved completely by 10 mol/L H2SO4 solution, the back-extract of Mn(Ⅲ) from P204 solution and the formation of activated manganese dioxide can proceeds in 4 mol/L H2SO4 solution at the sametime, and the product has good battery activity.