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The main advantages of the thiourea method are: 1) Non-toxic, no neutralization process is required before gold leaching, and cyanide is highly toxic, and a large amount of lime is added for pretreatment before cyanidation. 2) The thiourea regeneration and purification process is simple. 3) The dissolution rate of gold and silver is fast, generally 8 to 10 times faster than the cyanidation method, especially the dissolution of silver, which is far better than the cyanidation method. In the presence of SO 2 , the leaching rate of thiourea It is roughly the same as the cyanidation method. 4) Some impurities in raw materials, such as copper , arsenic , antimony, etc., are not as sensitive as cyanidation. The thiourea method is the most promising treatment for ore that is not suitable for cyanide leaching, especially those complex refractory ore and silver-bearing ore that have been pretreated by bacterial leaching or pressure leaching. However, the thiourea method has the following two disadvantages: one is that thiourea is easily oxidized, resulting in excessive consumption of thiourea, and the other is that thiourea is relatively expensive, and economically it is still competitive with cyanidation. Recent studies have shown that the introduction of SO 2 while controlling the pH of the medium can inhibit the oxidative decomposition of thiourea, reduce the consumption of thiourea to about 1/5, and treat some acidic gold ore with modified thiourea. It is cheaper than using cyanidation.
Dagu's main product capacity: ionic membrane caustic soda 600000 tons / year, polyvinyl chloride 800000 tons / year, propylene oxide 150000 tons / year; 500000 tons / year of styrene and 400000 tons / year of ABS resin.
Polyvinyl chloride resin (PVC): white powder in appearance. It is widely used in industrial products, floor leather, artificial leather, pipes, wires and cables, packaging film, foaming materials, etc. the packaging is 25kg / bag, 600kg / bag and 1200kg / bag. Product standard (Q / 12 hg5220-2019), main production product models and uses are as follows:
PVC Dg-1300: production of cable material, fresh-keeping film, etc.
PVC Dg-1000k: production of plastic profiles, pipes, etc
PVC Dg-1000s: production of packaging film, etc
PVC Dg-800t: production of packaging sheet, medical sheet, etc
Our long-term agent sales Dagu all series of PVC, with sufficient inventory and preferential prices. Customers are welcome to inquire and purchase.
PVC Dg-700: production of pipe fittings, foamed plates, etcPvc Resin Dagu Brand,Pvc Resin Dg-800T,Pvc Dg-1000S,Pvc Dg-1000K
Henan Chuange Industry CO.,LTD , https://www.chuangegroup.com