To refine gold, what chemical medicine is needed?

The Steps Involved in Extracting Gold and The Chemicals Required The first step is to dissolve the impure gold and put it into a beaker. Under ventilated conditions, add aqua regia (aqua regia is three parts of hydrochloric acid and one part of nitric acid) under ventilated conditions. Once the violent reaction is over, heat the mixture and allow it to evaporate back to its original volume. Approximately 1/5 of it, so that it is completely dissolved. Then drop concentrated hydrochloric acid (the amount of hydrochloric acid added is at most the amount of nitric acid in aqua regia, and it should be added three or four times when using hydrochloric acid) to drive away free nitric acid until no reddish-brown gas occurs, remove and cool, then filter to remove insoluble impurities. After filtering, the solution is a constant volume with distilled water, and the gold content is about 50 grams per liter.

The second step of reduction, control the temperature of the solution in the first step at 30 to 40 °C, and quickly add a sodium bisulfite solution with a concentration of 150 g/L while stirring, until all the gold is reduced to gold powder and precipitate, and then the solution is colorless after standing Clear before rinsing. Remove the supernatant, but do not remove the solids below, add boiling water, stir, wait for precipitation to remove the supernatant, and repeat until the pH is the same as the local water.

The third step of purification The gold powder precipitate obtained by filtration may also adsorb some impurities such as iron compounds, which must be removed to improve the purity of the gold powder. Stir the gold powder with 15% hydrochloric acid for 5 minutes, then pour out the acid solution carefully until it does not appear yellow. The following sediment should be filtered out as sponge gold.

The fourth step of smelting is to put the sponged gold into the crucible together with borax and heat it with a musket to get 99.9% pure gold. Required reagent tools: Nitric acid, hydrochloric acid, sodium bisulfite, borax, sodium carbonate, silver test paper, PH test paper, electric stove, tweezers, gas mask, acid and alkali resistant gloves, container, watering can filter pump, filter paper, musket, the crucible, Oil tank.
Gold Recovery Chemicals List

• Buy Nitric Acid
• Buy Hydrochloric Acid
• Sodium Cyanide
• Urea
• Muriatic Acid (Hydrochloric Acid)
• Acetic Acid (Vinegar)
• Sulfuric Acid
• Hydrofluoric Acid
• Sodium Bicarbonate
• Recovery of Gold by Precipitation with Zinc
• Zinc Strips
• Buy Mercury Metal (Liquid Mercury) And Triple Distilled Mercury For Gold Amalgamation
• Buy Mercuric Chloride To Remove Gold From Lead
• Aqua Regia (Nitric Acid And Hydrochloric Acid)
• Purified Sodium Metabisulfite (SMB/ Sodium Pyrosulfite) In Powder Form
• Lab Grade Sodium Metabisulfite
• Sodium Metabisulfite (Analytical Reagent) In Granular Form
• Potassium Nitrate (Saltpeter)
• Phosphoric Acid
• Silver Nitrate
• Sodium Hypochlorite
• Urea (Neutralizes Excess Nitric Acid In Aqua Regia Solutions)
• Boric Acid
• Ammonium Chloride
• Sodium Borate (Borax)

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