Step 1: gold removal: pour the waste into a basin, add gold removal powder according to the ratio of 1 kg, that is, 10 g, and then heat the water to start gold removal. Step 2: filter impurities, filter the gold water with filter cloth, pour it into a beaker, then add citric acid to make the gold water acidic, and adjust the PH value to about 5. Step 3: zinc wire adsorption: pour boiling water at 100 degrees Celsius into acidic gold water, and then put zinc wire for adsorption. Remember, water should cover the zinc wire. It takes a long time for gold water to adsorb on zinc wire, usually it takes 3 hours.

Refining gold

Step 4: zinc oxide wire: after absorbing the golden water, pour out the water in the beaker, pour in the oxidant, use the oxidant zinc oxide wire, and pay attention to stirring when oxidizing. After oxidation, pour it into a basin for purification. Step 5: purification: pour the oxidized gold powder into a beaker, repeat the operation, and pour off the excess water, and the remaining cotton-wool substance is sponge gold. Rinse the sponge gold with water, rinse off the medicine on the sponge gold, and rinse it several times to form gold mud. Step 6: Purification: Pour the gold mud into a beaker, add nitric acid to eliminate impurities, and heat it for purification, which can be heated in a battery furnace at home. Heating to boiling, cooling, and washing with hot water after cooling.

Jinsha