Resin method gold extraction process (1)

Resin-in-pulp gold extraction process mainly comprising pulp of gold cyanide adsorption, desorption, and recovery of gold from the resin regeneration gold loaded resin saturated three key job.
The ion exchange adsorption technology for extracting gold from cyanide pulp has the same two methods as the carbon slurry method: first, the slurry is cyanated in the stirred leaching tank, and then sent to the adsorption tank plus ion exchange resin to adsorb gold and silver ; The resin is added to the agitating leaching tank together with the slurry, and the cyanidation of the slurry and the adsorption of the resin are carried out partially or completely simultaneously (i.e., CIP process similar to the carbon slurry method). However, there are still many specific difficulties in the application of the latter.
1. Typical process of resin adsorption process
Most of the work of adsorbing gold on the resin is carried out in the slurry after cyanidation. Figure 1 shows a typical gold ore cyanide leaching adsorption process, or an adsorption leaching process. It is basically similar to the carbon slurry method.

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The finely ground ore powder enters the adsorption leaching with 40%~50% of the slurry containing solids, and the slurry is first sent to the sieve separation process to remove the wood chips. Because wood chips have a bad influence on the technical and economic indicators of precious metals during cyanidation and adsorption processes, especially during resin regeneration. After fine grinding and grading of the ore, it is more appropriate to carry out sieving and removing wood chips before thickening, because at this time, the concentration of the slurry is low, and sieve analysis does not cause difficulty. As with the carbon immersion method (CIL), the first two to three tanks are also used for pre-cyanide. If cyanide starts at the time of grinding, then there is no pre-cyanide tank, but only an adsorption leaching tank. In the adsorption leaching system, the slurry and resin are also countercurrent motion. The tailings discharged from the last adsorption leaching tank shall be screened and recovered to recover the fine gold-loaded resin to avoid permanent gold loss. The gold-loaded resin produced from the first adsorption leaching tank is separated from the slurry on the sieve while washing with water. After sieving, the resin is sent to the jig to separate the coarse ore with a particle size of >0.4 mm from the resin. The small amount of coarse ore will cause difficulty in equipment operation and deteriorate the regeneration technical index when the resin is regenerated in the next step.
An anion exchange resin is added to the Pachuca adsorption tank (see Fig. 2) for countercurrent adsorption to produce saturated gold, silver resin and tailings slurry. Before the tailings slurry is sent for purification, it needs to be controlled and sieved to capture the lost resin and return to a certain adsorption tank at the tail of the adsorption process. After the gold-loaded resin is separated from the slurry on the sieve, it is washed with water, sent to the jig to separate the ore of more than 0.4 mm, and then the concentrate is selected by the shaker to return to the ore. The resin produced by the jig is sent to the regeneration section to desorb the gold. The volume of the trough is up to 500m ³ .

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Due to the high gold content of flotation reagents, mercury and concentrate ore in the slurry, the operation of the resin to adsorb gold from the cyanide slurry of the flotation concentrate is different from that of the ore cyanide slurry. For ore with a gold grade of 3~5g/t, the resin is loaded with gold 5~20kg/t; it is 2000~4000 times of the original ore. Therefore, the amount of resin sent for regeneration is small.
The mass fraction of cyanide in the adsorption leaching process is 0.01%~0.02%, which is much lower than the traditional cyanidation method (concentration 0.03%~0.05%), because as the CN-concentration increases, it also enhances the adsorption of the resin. Increasing the cyanide concentration reduces the adsorption capacity of the resin to gold; in addition, as the CN-concentration increases, the amount and amount of impurities transferred to the solution increases, which also reduces the gold loading capacity of the resin.
The pure saturated gold-loaded resin after separation of the ore is sent to the regeneration section to recover gold, silver and other valuable metals to restore the adsorption performance of the resin.
2.All-2 type resin adsorption process
In the former Soviet Union, the semi-industrial adsorption test of cyanide slurry containing gold ore was carried out using All-2 mixed alkali anion exchange resin. The test procedure and process conditions are shown in Fig. 3.

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The ore used for the test is a quartz low sulphide ore containing gold 3~6g/t. The gold is mainly granulated with strontium and arsenic minerals in the ore and contains a large amount of primary slime. Cyanide pulp 98%~99% -0.074mm, liquid-solid ratio (1.8~2): 1, with mass fraction of 0.03% NaCN, 0.015% CaO, dissolved gold 1.02~1.78g/m ³ , undissolved gold 1.09 ~1.63g/t. The experiment used 8 stages of continuous countercurrent adsorption to treat 640m3 of slurry.
All-2 resin is added to the cyanide slurry of the Pachuca leaching tank which is stirred by air. The addition amount is 0.2%~0.4% of the volume of the pulp. After 4.5~7h adsorption, the volumetric mass concentration of dissolved gold in the tailings is It is traced to 0.093g/m ³ and undissolved gold is 0.6~1.0g/t. It is discarded after purification treatment. During the adsorption process, the undissolved gold in the slurry can be redissolved by 30.7%~47%, so that the recovery rate of gold is increased by 10%~11%, that is, the total recovery rate of gold is increased from 64%~70.3% to 80.8%~ 82.6%. Table 6.3.6 lists the actual indicators for the adsorption of metals from the cyanide solution of All-2 resin.
Hydrocyclones, hydraulic separators, flotation machines, pulse column sieving machines, jigs, sieving machines, screening machines, shakers and electromagnetic concentrators have been tested to separate the gold-loaded resin in the slurry. None of them achieved 100% resin recovery. During the process, the resin consumption due to mechanical wear is less than 2 g/t ore.
The separated gold-loaded resin is first washed with 5 volumes of water in the column to remove slime and debris, and then 5% H ₂ SO ₄ (8-10 resin volume) solution at 30 ° C, 1~1.51 m / h flow rate pickling zinc , nickel and CN-, then in 5% SC (NH ₂ ) 2, 2.5 H ₂ SO ₄ solution (1.5 ~ 2.9 resin volume), at a temperature of 30 ° C, area current 2.5A /dm ² , under the condition of 2V cell voltage, after 6~8h electro-elution, more than 95% of gold and silver on the resin can be desorbed. Table 1 lists the metal content and desorption rate before and after resin regeneration.

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