despite the military demand for cast iron, most civil applications required malleable iron, which until then had been made directly in a bloomery. the arrival of blast furnaces, however, opened up an alternative manufacturing route this involved converting cast iron to wrought iron by a process known as fining. pieces of cast iron were placed on a finery hearth, on which,cyanide destruction methods and processes,jul 07, 2016 the methods available for cyanide detoxification can be grouped in the following categories cyanide removal. natural volatilization. adsorption onto minerals. oxidation to the less toxic cyanide species. natural oxidation. iron complexation. hydrogen peroxide process. sulfur dioxide assisted process.