Axi gold mine gold extraction plant, in June 1993, construction work began in June 1995, produced the first piece of gold bullion qualified. The plant was designed with pre-cyanide and CIL gold extraction technology. The final solution is to introduce the re-election of a resin from the CIS. The scale of the plant is 750t / d, is a large gold mine, with an annual output of 40,000 gold, equivalent to 1250kg.
The basic process of the plant is: re-election, the concentrate is separately strengthened by cyanidation and resin slurry method; the tailings are re-milled, pre-cyanated and then combined with the re-selected tailings to further pre-cyanide, and then The resin slurry method adsorbs and extracts gold and silver . The gold-loaded resin is washed by sulfuric acid to remove bismuth metal such as zinc , nickel and copper, and the thiourea and sulfuric acid mixed liquid desorbs gold and silver, and the product desorbed liquid is recovered by electrowinning to recover gold and silver, and the resin-poor alkali is regenerated.
The tailings slurry after gold extraction is treated by chlorine gas oxidation obtained by liquid chlorine gasification. The production practice proves that the operating conditions of the method are good and the pass rate of cyanide is high. The specific grinding process, re-selection of pre-cyanide concentrate, resin pulp slurry adsorption leaching process are shown in Figure 1 and Figure 2, respectively.
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As can be seen from the figure, the process characteristics of the treatment of the mine are as follows:
1 The grinding process is simple. A section of open circuit is used for crushing. The self-grinding machine of Ф5.5m×1.8m and the two-stage closed-circuit ball mill are used in the grinding . The qualified grain size is -0.074mm and accounts for 90%. The original design is a traditional process of three sections, one closed road, and two stages of ball milling. Under the same power consumption conditions, the current design processing capacity is slightly improved.
2 Adding a re-election process, and strengthening the pre-cyanide separately for the concentrate. The resin slurry is adsorbed and leached; after the adsorption, the tailings are pre-cyanated after ball milling and combined with the pre-cyanide slurry of the re-selected tailings, and then adsorbed by the resin slurry leaching system, so that the fineness of the grinding is relaxed, from the original design - 0.074mm accounted for 95% reduction to 90%, which not only reduced the grinding cost, but also shortened the total leaching time by 4h; the amount of NaCN also decreased, from 1.1kg/t of the original carbon leaching method to 0.78kg of the current process. /t; The recovery rate of gold is stable.
3 The equipment in the main process is all made in China. D301G anion exchange resin produced by Nankai University Chemical Plant in China is used in the adsorption leaching process. One year of production practice has shown that the resin loss is 25 g/t, while the original design of the CIL method has a carbon loss of 100 g/t.
4 Because the pickling method is used to remove a large amount of base metal on the gold-plated resin, and a durable plate-shaped cathode is used, the obtained gold mud has a high grade, wherein the gold content is 60% and the silver content is 25%, which is the original CIL. The gold grade in the gold mud obtained by the law is three times. This high-grade gold mud not only simplifies the subsequent smelting process, but also has a smelting recovery rate of 99.8%, and the resulting merging gold purity is as high as 99.9%.
5 The total recovery rate of this process design is 92.36%, while the total recovery rate of the original designed CIL method is only 89%. In the first year after production, the actual recovery rate of actual metallurgy has exceeded 91%.
6 For the mine, the re-election and resin slurry method for gold extraction combined with the single CIL method to increase the income (the first year after the production) of 6.08 million yuan. Among them, the savings were 1.46 million yuan, and the income was increased by 4.62 million yuan due to the increase in recovery rate.
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