将醇氧化成醛时用过，非活性或者活性不高影响产率。
制法有文献：
O.Mancera，G.Rosenkranz，and F.Sondheimer，J.Chem.Soc.，1953，75,2189

Manganese dioxide.  Concentrated aqueous potassium permanganate was added to a stirred  aqueous manganese sulphate solution kept  at go", until  a slight excess was present  (pink coloration of  the  supernatant  liquid).  Stirring at 90" was continued for a further  15 min. The oxide was collected by filtration, washed well with hot water, then with methanol and ether, and dried at 120-130'  to constant weight.  It could be kept for several months in a well- stoppered bottle without loss in activity，

活性MnO2由高锰酸钾与硫酸锰制备

请问用高锰酸钾和硫酸锰生产二氧化锰的厂家？这种二氧化锰的晶型？