Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB94/30A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEA Group AG
Original Assignee
Metallgesellschaft AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metallgesellschaft AGfiledCriticalMetallgesellschaft AG
Publication of GB335852ApublicationCriticalpatent/GB335852A/en
335,852. Metallges. Akt.-Ges. June 4, 1929, [Convention date]. Roasting. -In a process of roasting finelydivided sulphide ores such as zinc blende in two stages, the second of which may be blast-roasting, a material such as silica or ferric sulphate or both, or clay in the form of loam, is added to the ore before or during the first stage, with a view to obtaining increased grain size in the product.