Method for gold extraction from cyanide solutions with dissolved mercury contained in them

FIELD: metallurgy.

SUBSTANCE: method for gold extraction from cyanide solutions with dissolved mercury contained in them, gold-bearing ores formed during leaching, involves sorption of gold and mercury on activated carbon with enrichment of activated carbon with gold and mercury. Then, gold desorption is performed with alkali-cyanide solution under autoclave conditions, gold electrolysis from strippants so that cathode deposit is obtained and its remelting is performed so that finished products are obtained in the form of raw base gold alloy. Prior to gold desorption the selective desorption of mercury is performed by treatment of saturated carbon with alkali-cyanide solution containing 15-20 g/l of sodium cyanide and 3-5 g/l of sodium hydroxide, at temperature of 18-20°C and atmospheric pressure during 10 hours.

EFFECT: simplifying the method due to mercury desorption in a separate cycle prior to gold desorption; improving selectivity of gold extraction and creation of possibility of safer conditions during processing of cathode deposits so that finished products are obtained.

4 tbl, 1 ex

 

The invention relates to the field of sorption technology for extracting gold from solutions obtained by cyanide leaching of gold-bearing ore products.

Some gold-bearing ores are associated metals, in particular mercury, which reacts with sodium cyanide leaching of gold. Minerals mercury as sulfide and oxidized interact with sodium cyanide with the formation of cyanide complexes

Hg(CN)20Hg(CN)31-and Hg(CN)42-

In sorption processes using activated charcoal for refining gold cyanide solutions in the presence of dissolved mercury and the concentration of free cyanide ion in the range of 0.5-1.0 g/l dominates sorption maasarani complexes of mercury: neutral Hg(CN)20and single shot Hg(CN)31-having a stronger affinity for activated carbon, than multiply charged anion Hg(CN)42-.

It is also known that a neutral complex of mercury Hg(CN)20in the process of sorption significantly competes directly with a singly charged anion gold Au(CN)21-for adsorption places on the surface of activated charcoal and even displaces some amount of adsorbed gold from phase saturated coal [G.J.McDougll, R.D.Hancock, M.G.Nicol. "The mechanism of the adsorption of gold cyanide on activated carbon". - Joumal of the South African Institute of Mining and Metallurgy, September 1980, p.354-355].

When the concentration of free cyanide ion more than 1 g/l in solution are formed complex multiply charged anions Hg(CN)42-weakly sorbed activated carbon and poorly retained in the phase sorbent.

The prototype of our proposed method sorption of gold from cyanide pregnant solution leaching of gold-bearing ores in the presence of dissolved mercury may serve process, which includes:

- getting busy on gold activated carbon containing and mercury;

- joint desorption of gold and mercury-free alkaline-cyanide solution in the autoclave conditions (elevated temperature of 130-150°C and a pressure of 4-5 bar) to obtain commercial decorate containing both gold and mercury;

- the joint selection of gold and mercury cathode sludge during electrolysis of a solution of a trademark decorate. The content in the cathode Deposit - up to 50% gold and 3-6% mercury;

- removal of mercury from the cathode sludge distillation method (distillation) in a special retort furnaces before remelting rough gold;

- heat treated from mercury cathode precipitation flux to obtain the finished product in the form of draft alloy Dore gold, do not contain mercury.

In the case of gold and mercury in conjunction retrieved from cyanide solutions on activated carbon almost completely. Separation of mercury from gold is possible only at the stage of distillation of mercury from the cathode Deposit in retort furnaces. ["Introduction to Evolution Design and Operation of Precious Metal Heap Leaching Projects." - Mining Engineering Inc., Colorado, 1988; Mining magazine, November 1987, p.402-403].

The disadvantages of this method of gold extraction are:

- a multi-stage process;

- selection of mercury together with gold in many operations, which are a source of formation of aerosols, mercury, and increased toxicity in the premises;

- the complexity of the removal of mercury from the process;

- low efficiency of the process.

The problem to address with the proposed method, - preventing mercury in the main loop of the particles of gold from the saturated activated carbon, i.e. carrying out desorption of gold from obtaining a trademark decorate, not containing mercury; electrowinning of gold from commodity decorate with the formation of the cathode Deposit, do not contain mercury; exclusion from the operation of the distillation of mercury from the cathode sludge; melting of cathode gold with flux from receipt of the finished product in the form of draft alloy Dore gold, do not contain mercury.

To solve it we need to create conditions for removing mercury from the saturated activated charcoal before desorption of gold.

The technical result izobreteniya simplification of the way through the selective desorption of mercury in a separate cycle prior to desorption of gold, improving the selectivity of the extraction of gold and create safer conditions in the processing of cathode Deposit with receipt of the finished product.

The technical result is achieved in that in the method of extraction of gold from cyanide solutions present in them dissolved mercury, resulting in the leaching of gold-bearing ores, including gold sorption and mercury on activated carbon with saturation of activated carbon with gold and mercury, desorption of gold in alkaline cyanide solution in the autoclave conditions, the electrolysis of gold from decorativ to produce cathode precipitate and melted with the delivery of finished products in the form of a draft of an alloy of gold ligature before desorption of gold in autoclave conditions hold for the selective desorption of mercury by processing the saturated activated charcoal alkaline-cyanide solution containing 15-20 g/l NaCN and 3-5 g/l of NaOH at a temperature of 18-20°C and atmospheric pressure for 10 hours.

The method is as follows.

Example:

1. The original saturated activated carbon containing 5.6 mg/l of gold and 7.5 mg/l mercury, processed, alkaline-cyanide solution in a laboratory autoclave at a temperature of 130°C. When the joint desorption of gold and mercury received trademark desorbed containing 238 mg/l of gold and 367 mg/l RT the tee. Electrolysis of dealbata (current - 1A, voltage is 3.4 V, the anode is graphite, the cathode is stainless steel) leads to the formation of the cathode sludge containing 51.5% of the gold and 11.6% of mercury.

The resulting product requires additional operations to remove mercury before remelting cathode Deposit and receipt Dore gold.

2. The original saturated activated carbon with a content of 5.6 mg/g of gold and 7.5 mg/g of mercury volume of 50 ml was placed in a laboratory desorption column and in pumping mode Stripping solution containing 20 g/l NaCN+5 g/l NaOH, under dynamic conditions with a speed of 1 rpm./about. coal·h at a temperature of 18-20°C was performed experiments on selective desorption of mercury. The duration of the desorption process is 10 hours. After the end of the experiment desorption of a sample of activated carbon was washed from reagents fourfold volume of water, dried and analyzed for residual mercury content in the activated carbon after desorption.

Solutions selective desorption of mercury from the saturated activated carbon with a content of 0.2 mg/l of gold and 200-300 mg/l of mercury fed to the cleanup operation from mercury by precipitation of insoluble precipitate of sulphide of mercury (PRHgs=4,1·10-54)separating the precipitate from the solution by filtration. Free from mercury solutions doubleplay by NaCN and NaOH and return to the process of selective desorption is Tuti.

The results of the experiments are given in tables 1-4.

Table 1
The effect of the concentration of NaCN in desorbers solution for removing mercury from activated carbon
The concentration of alkali - 5 g/l NaOH
Temperature - 20°C
Duration - 10 hours
The NaCN concentration, g/lResidual mercury content in coal, mg/gRecovery of mercury during desorption, %
100,198,67
150,003of 99.96
200,00199,99
300,002of 99.97
40 0,00599,93

The most effective concentration of NaCN in desorbers solution is 15-20 g/L. recovery of mercury from the activated carbon when desorption was ~ 100%. To increase the concentration of NaCN more than 20 g/l impractical.

Table 2
The effect of NaOH concentration in desorbers solution for removing mercury from activated carbon
The NaCN concentration of 20 g/l
Temperature - 20°C
Duration - 10 hours
The concentration of NaOH, g/lResidual mercury content in coal, mg/gRecovery of mercury during desorption, %
20,0599,30
30,0199,90
50,005 99,93

The data in table 2 show that the extraction of mercury during desorption excess of 99.5% is achieved when the alkali concentration of 3-5 g/l NaOH.

Table 3
The dependence of the extraction of mercury from temperature desorption her activated charcoal
The NaCN concentration of 20 g/l
The concentration of NaOH, 5 g/l
Duration - 10 hours
The temperature of the desorption process, °CResidual mercury content in coal, mg/gRecovery of mercury during desorption, %
150,0199,90
200,00199,99
300,396,00

From the data in table 3 should, Thu the maximum extraction of mercury ~ 100% was achieved at a temperature of 20°C. Increasing the temperature to 30°C leads to a sharp decrease in the degree of extraction of mercury during desorption.

Table 4
The influence of the duration of desorption on the extraction of mercury from activated carbon
The NaCN concentration of 20 g/l
The concentration of NaOH, 5 g/l
Temperature - 20°C
The duration of the desorption, hResidual mercury content in coal, mg/gRecovery of mercury during desorption, %
40,593,30
60,297,30
80,00699,92
100,00199,99

The results, PR is presented in table 4, show that ceteris paribus the maximum recovery of mercury from activated carbon ~ 100% is achieved when the duration of the desorption process 10 hours.

Thus, it is experimentally proved that the method of extraction of gold from cyanide solutions present in them dissolved mercury when conducting before desorption of gold operations selective desorption of mercury from compliance options:

the temperature of 18-20°C at atmospheric pressure;

the concentration of NaCN - 15-20 g/l;

the concentration of NaOH - 3-5 g/l;

- duration of 10 hours, has a number of advantages:

1. Significantly increases the degree of selective extraction of gold by eliminating competition mercury.

2. The process is greatly simplified by eliminating complex and time-consuming operations of the separation of gold and mercury, as the latter is completely removed before the desorption of gold.

The method of extraction of gold from cyanide solutions present in them dissolved mercury, resulting in the leaching of gold-bearing ores, including gold sorption and mercury on activated carbon with saturation of activated carbon with gold and mercury, desorption of gold in alkaline cyanide solution in the autoclave conditions, the electrolysis of gold from decorativ to produce cathode wasp is AC and it melted with the delivery of finished products in the form of a draft of an alloy of gold ligature, characterized in that before the desorption of gold conduct selective desorption of mercury by processing a busy coal alkaline-cyanide solution containing 15-20 g/l of sodium cyanide and 3-5 g/l of sodium hydroxide at a temperature of 18-20°C and atmospheric pressure for 10 hours



 

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