What is gold slag?Usually from electronics, jewelry, dental and other industries, gold slag contains a certain amount of gold, so it can be refined by the method of gold, we usually use solid phase extraction method to refine, which is a commonly used method of refining gold slag.
Solid phase extraction is the use of solid phase extractant and ** complexation reaction, so as to extract ** from gold slag, solid phase extractant is a substance that can form a stable complex with gold, commonly used solid phase extractants are sulfonyl compounds, phosphate compounds, chelating agents, etc.
The gold slag waste is crushed into fine particles, and then finely crushed with a ball mill to control the particle size below 200 mesh, and then, soaked in an acidic solution, the pH value is controlled to 5-6, so that the ** in it is dissolved into an ionic form, this process needs to control the temperature, time and acidity, so as not to lose too much ** or produce harmful by-products.
Sulfonated polystyrene was selected as a solid phase extractant, which has excellent chemical stability and mechanical strength, a certain amount of sulfonated polystyrene resin was weighed, washed and purified with a diluted acid solution, and then prepared into a slurry by wet method, loaded into an extraction column, balanced with a diluted acid solution, and the filling height was 15 cm.
The pretreated gold slag solution was treated with 05mol l of sulfuric acid solution is adjusted to pH 2, and then configured into a suspension, the suspension is slowly added to the extraction column, the flow rate is controlled at 1ml min, and the impregnation is carried out under a certain temperature and stirring conditions, so that the ** ions in the gold slag will interact with sulfonated polystyrene and be selectively adsorbed, this process needs to control the reaction time and speed to ensure complete reaction and maximum adsorption capacity.
Add a pH of 15 diluted acidic solution into the extraction column, slowly eluted at a flow rate of 5ml min, the color of the eluent changed from red to light, until the eluent was colorless and transparent, and the impurities could be eluted. Then slowly add 05mol l nitric acid solution elutes the enriched ** and collects the gold-containing eluent, this process requires the control of washing and soaking conditions to avoid loss of ** or pollution of the environment.
Then, the collected eluent is evaporated and concentrated, and further impurities are removed by a series of activated carbon columns to obtain a high-quality gold solution. Finally, the insoluble cathode is used to electrolytically extract the ** solution, and the purified ** powder in a solid state can be obtained on the cathode, which needs to control the reduction current and voltage to ensure high purity and high ** rate.
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