33 results about "Silver cyanide" patented technology

The invention relates to a technology for extracting zinc, lead and silver step by step by processing zinc-leached residues by a full wet process, and belongs to the technical field of zinc-leached residue recycle. The technology comprises the following steps of: preparing sulfuric acid into an appropriate concentration, and performing two-stage acid leaching in an appropriate liquid-solid ratio and at a high temperature to obtain slurry; filtering and separating the slurry to obtain lead-silver residues and a zinc-containing solution; oxidizing, neutralizing and deironing the zinc-containing solution, and depositing zinc by using sodium sulphide; and eluting the lead-silver residues, blending with caustic lye at an appropriate concentration to obtain slurry at a certain concentration, reacting at a certain temperature and in a certain solid-liquid ratio, and filtering and separating to obtain a filter cake and a filtrate, wherein the filtrate is directly added with sodium sulphide for lead deposition and the filter cake returns to a silver cyaniding leaching process. The technology is short in process, simple in operation, low in cost and mild and loose in reaction conditions; an acid solution and an alkali solution at high concentrations are not required; requirements on equipment are low; the extraction rate of metal is higher than that in the conventional method; no additional waste solid, waste liquid and waste gas are discharged; the recycle of the eluate and the filtrate is realized; and environment pollution is avoided from the source.

The invention belongs to the field of smelting of silver cyanide mud, and in particular relates to a method of wet extraction of silver from cyanide silver mud. The silver cyanide mud is treated through a medium-high potential wet method to be chloridized to become solid silver cyanide mud which continues to be treated by a series of steps of roasting, heating, cooling, reduction and the like to obtain elemental silver; with polyhydroxy aldehydes used for reduction, silver is quickly and efficiently reduced to the solid, and the elemental silver of high purity is obtained. The method of wet extraction of silver from the cyanide silver mud has the advantages of easy control of process conditions, simple equipment and low cost, high added value of products, high direct recovery efficiency, high safety, small environmental pollution and high economic efficiency.