Extraction method for precious metal attracted to columnar activated carbon

Abstract

The invention discloses an extraction method for precious metal attracted to columnar activated carbon. According to the extraction method for the precious metal attracted to the columnar activated carbon, it is determined that the adding quantity of sodium cyanide is 190 Kg per batch, the adding quantity of sodium hydroxide is 200 Kg per batch, and the weight of gold-loaded carbon each batch is 3300 Kg; the flow Q of circulation liquid in the overall desorption process is 5 m<3> / h; electrodeposition is started when the inlet temperature of an electric heater reaches 60 DEG C, and the electrodeposition voltage is direct current 2.7 V; heating is stopped when the inlet temperature reaches 100 DEG C, constant temperature electrodeposition desorption is carried out for 4-5 h, and then heatingis carried out; and after the desorption temperature is heated to 145 DEG C, electrodeposition is continuously carried out for 14 h, wherein the heating and heat preservation state is kept at the first 12 h, heating is carried out at the last 2 h. The desorbing process in each batch is shortened from 36 h to 24 h, the lean carbon gold grade is reduced from 130 g / t to 50 g / t or below, the silver grade is reduced to be lower than 100 g / t, and the desorption rate is 97% or above. By means of the extraction method, the gold and silver desorption rate is improved, the desorption time is shortened,and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of precious metal smelting methods, and in particular relates to a method for extracting precious metals adsorbed on columnar activated carbon. Background technique [0002] Most gold enterprises in the country use coconut shell activated carbon as the gold adsorption carrier in the gold adsorption process, but coconut shell carbon has the disadvantages of smaller specific area and lower adsorption rate than columnar carbon. [0003] Since there are few domestic gold enterprises using columnar activated carbon as gold adsorption carrier, the desorption process of gold-loaded carbon is not mature enough, and the desorption time is long. The desorption time of each batch of gold-loaded carbon is 36 hours; the gold and silver grade of depleted carbon after desorption is higher , the desorption rate is low, the carbon-poor gold grade is 300g / t, and the silver-gold grade is 200g / t, resulting in a backlog of gold ...

AI Technical Summary

Problems solved by technology

[0002] Most gold enterprises in the country use coconut shell activated carbon as the gold adsorption carrier in the gold adsorption process, but coconut shell carbon has the disadvantages of smaller specific area and lower adsorption rate than columnar carbon

[0003] Since there are few domestic gold enterprises using columnar activated carbon as gold adsorption carrier, the desorption process of gold-loaded carbon is not mature enough, and the desorption time is long. The desorption time of each batch of gold-loaded carbon is 36 hours; the gold and silver grade of depleted carbon after desorption is higher , the desorption rate is low, the carbon-depleted gold grade is 300g / t, and the silver-gold grade is 200g / t, resulting in a backlog of gold and silver metals and increasing the cost of desorption

Images