1. Treatment of cyanide barren liquor in gold mine:

    There are more associated metals in ores which mix s₩ome other impurity ions, and if the leaching solution is not treated effectively, it will affect t☆he next process. In addition, in the process, some substances should be added, and if it is n☆ot handled in time, it will affect the next process. In the process of gold smelting, the ad₩ded leaching agent sodium cyanide is toxic, and the nat¶ional wastewater discharge standard is 0.05mg/L, but the amount of barren liquor is 0.1g/L. It is ÷impossible to directly discharge it, but the addition of sodium hypochl↓orite not only consumes a large amount of medicamen¶ts, but also wastes the available cyanogen, which is unqualified. Recycling is normally≤ used, and the excessive times of use generate the cumu"lative effect of impurity ions, especially copper, zβinc, iron, calcium and other factors affecting the leaching of gold and carbon adsorption ef¶ficiency. Now the common practice is to add acid and alkali to absor€b and recycle cyanide ions and produce metal cyanide pr★ecipitations. However, on the one hand, the hydrogen cyanide gas appears in this practi"ce, which is prone to poisoning, and on the other hand, ¥a lot of calcium sulfate slag blocking the pipeline can’t be rem☆oved.
 

•  The membrane separation technology is used to deal wiγth cyanide barren solution, and the selection of appropriate membraσne will influence the separation of leached and adsorbed divalet ions or multiple valenγce ions, and it can also recycle gold, silver and available cyanogens. The membrane "technology has the following advantages:
•  Free alkali, cyanide ion and complex gold and silver ions in th£e cyanide barren solution entering the water production measurεement will be recycled in the cyanide process, which not only re$cycles alkali and cyanide ions to save chemical reagent consumption, but∑ also indirectly recycles about 0.05~0.1g/L of gold and silver in the barren solution to impr✘ove gold output efficiency.
• Free alkali, cyanide ion and complex gold and silver ions in the cyanide baπrren solution entering the concentrated water measurement are concentrated, w≥hich not only separates them from the reused water to improve the effective leaching rate o☆f sodium cyanide and reduce the utilization ratio of sodium cyanide, but also recy>cles copper, zinc, iron and other cheap metals to i→ncrease production efficiency.
• The process is a physical separation process that does not require the ad§dition of a large amount of precipitants and neutralizers,♠ thereby saving costs. It is expected that the tot¶al cost of the saved sulfuric acid, lime and labor reaches 5 yua‌n/m3.
•  It doesn’t produce hydrogen cyanide gλas, so it will not bring toxic substances to human bodies, as well as a lot of♣ precipitates of calcium sulfate and the lime wastes which don’ conduct complete chemical rΩeaction with green environmental protection function.
•  Complex acidification process should convert the acid solution, aδnd then it should add alkali for neutralization, so it is difficult to control. Howλever, the membrane separation is only a filtration process, which has the adv<antages of easy control, simple operation and automatic operation, thereby greatly improving t$he processing efficiency.
• Membrane separation technology devices cover small land aσreas and have low operating costs. According to the preliminary calculation, the payback period of σdevice investment is about 1 year. There are obvious e↓conomic and environmental benefits.

    

   2. Membrane filtration and impurity removal before ext✔raction process
 

      Extraction is an enrichment method often used ‌in hydrometallurgy. However, the emulsification phenomenon and fl​occulation problem often occur in the process. The reason is that the solid pa∏rticles and colloidal silica exist less than 1um exist in the leaching solution.δ The present solution is to regularly extract partial floccul∏ation treatments to recover organic phase. Nevertheless, it will cause partial ♥losses of expensive extractants and increase production costs. Therefore, the fundamental• way to reduce floccules is fine filtration.

      The particle suspensions and ferrosilicon colloφids in the leaching solution affect the extraction process and even produce÷ emulsification and flocculation particles, which not only affΩects the extraction efficiency, but also causes the loss of expensive extraπctants and improves the production cost. In the extraction solution‌ SS = 10mg/L.

      The removal of suspended particle substa£nces and ferrosilicon colloids in the leaching solution by microfiltration and ultrafilt←ration is the most widely used method and the most effective and mature process'. In particular, the ceramic membrane is suitable for the system because of its excell∞ent properties of acid-alkali resistance and oxidants.

      The removal of colloidal silicon, aluminum and iron£ by the ceramic membrane has been applied in industry and has become an ind♥ispensable pretreatment process before nanofiltration and reverse osmosi‍s process.

    

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