Extraction of gold, palladium and platinum from chloride solution

FIELD: mining.

SUBSTANCE: invention refers to the area of the extraction of gold, palladium and platinum from hydrochloric solutions. The method comprises their anionite sorption and desorption. The sorption shall be performed with low-basic anionites. After sorption, desorption with a mixture of sodium sulfite salts mixture Na2SO3 and sodium nitrite NaNo2.

EFFECT: quantitative extraction of complex chlorides of gold, palladium and platinum from aqueous solution in a wide range of hydrogen chloride concentrations.

1 ex

 

The invention relates to the metallurgy of noble metals, in particular to the hydrometallurgy of gold, platinum and palladium, the methods of removing them from solution by adsorption by-exchangers.

The known method of sorption complex chlorides of gold, platinum and palladium by-exchangers in the whole range of concentrations of HCl (chemist's Handbook edited Bpiolar, 1955, Vol. 4. S).

Closest to the technical nature of the solution is patent "Net copolymers of 1-vinyl-1,2,4-triazole with devicelevel ether of diethylene glycol as sorbents of precious metals from acidic environments and method of production thereof" (EN 2326131 C2 (IPC B01J 20/26, publ. 10.06.2008). Desorption of noble metals carried out with a solution of thiourea. The proposed sorbent has a complexing properties that may cause difficulties during desorption.

The difference between the claimed invention is that sorption was carried out at slightly basic anion exchangers and desorption is conducted with a solution of a mixture of salts of sodium sulfite (Na2SO3) and sodium nitrite (NaNO2.)

The objective of the invention is to develop a quantitative recovery of gold, platinum and palladium in connection with the planned development of the Sukhoi Log Deposit with the balance gold reserve of more than 1,000 tons, the average grade of gold 2,71 g/t and the content of platinum in the range from Sotho tenths g/T. According to Vighnaraja and others in the gold deposits of the Mesozoic black shale strata of the North-East of Russia - the content of platinum and palladium in some samples up to 0.5-1 g/t (Vigenere and other Gold of Siberia and the Far East. Theses 3 all-Russian Symposium. Ulan-Ude. 2004. P.53-57).

It is advisable to consider the possibility of joint in one operation of extraction of gold, platinum and palladium from concentrates produced from ore Sukhoi Log with a gold grade of 100 g/t and a platinum concentration of 20 g/T. the essence of the invention is that complex chlorides of gold, platinum and palladium are sorbed effectively slightly basic by-exchangers of HCl, extraction of gold, platinum and palladium from the anion exchange resin is carried out in one operation with a solution of a mixture of salts of sodium sulfite (Na2SO3) and sodium nitrite (NaNO2). For desorption is applied a solution of a mixture of salts of sodium sulfite (Na2SO3) and sodium nitrite (NaNO2), which has an alkaline nature, which leads to the neutralization of the protonated form slightly basic anion exchange resin and, thus, to a loss of (anion-exchange properties) capacity retention of anions. When desorption solution mixture of salts of sodium sulfite (Na2SO3) and sodium nitrite (NaNO2) precious metals become soluble compounds: gold Nasub> 3[Au(SO3)2], platinum in Na2[Pt(NO2)4], palladium in Na2[Pd(NO2)4] and, thus, remain in the solution. Desorption occurs frontal displacement of sorbed anions resulting in the formation of concentrated solutions.

Example

The extraction of gold, platinum and palladium in the form of complex chlorides was made slightly basic by anionoobmennika Purolite S 990 from the solution, the saline background which presents hydrochloric acid salts of iron, copper, sodium chloride and hydrochloric acid:

1 mol/lFeCl3
0.1 mol/lCuCl2
1 mol/lNaCl
1 mol/lHCl

The noble metal content was:

Au25 mg/l
Pt5 mg/l
Pd5 mg/l

The solution was passed through a column of resin in circulation mode with a speed of 2 volume of resin per hour (BV/h) for getting us the seal resin. The ratio of solution:resin=1000:0,2, Hitch resin 0.2 g has a theoretical capacity in moles, 10 times greater than the total the total content of noble metals in moles in 1 l of solution.

The saturated resin was washed from iron washing water of 5-10 BV/h. For elution of noble metals saturated resin was cured in a 1 M solution of a mixture of salt and sodium sulfite (Na2SO3) and sodium nitrite (NaNO2) at 20 or 50°C for 1 or 4 hours. Ratio when the elution resin:solution=1:25.

The capacity of the ion exchanger Purolite S, 990 mg/g was on:

Gold120 mg/g
Platinum20 mg/g
Palladium20 mg/g

at equilibrium with the solution:

Gold0,12 mg/g
Platinum1 mg/g
Palladium1 mg/g

So, obviously, the capacity of the anion exchange resin will be higher at full saturation and, consequently, the content in the eluate.

The content in the raffinate was:

Gold0,12 mg/g
Platinum1 mg/g
Palladium1 mg/g

The content in the eluate/solution mixture of salts of sodium sulfite (Na2SO3) and sodium nitrite (NaNO2) was using:

1 molar solution, exposure 4 hours. 50°C:Gold5000 mg/l
Platinum1000 mg/l
Palladium1000 mg/l
1 molar solution of extract, 4 hours, 20°C:Gold490 mg/l
Platinum80 mg/l
Palladium97 mg/l
a 0.1 molar solution, exposure 4 hours. 50°C:Gold530 mg/l
Platinum 180 mg/l
Palladium190 mg/l
1 molar solution, exposure 1 hour. 50°C:Gold520 mg/l
Platinum180 mg/l
Palladium190 mg/l

The method of extraction of gold, platinum and palladium from hydrochloric acid solutions, including their adsorption on the anion exchange resin and desorption, characterized in that the sorption was carried out at slightly basic anion exchangers and desorption is conducted with a solution of a mixture of salts of sodium sulfite Na2SO3and sodium nitrite NaNO2.



 

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