First, the refractory gold ore tailings and cyanide gold extraction and utilization: Zhejiang Shengfa Textiles Printing&Dyeing.,ltd , https://www.chzjsf.com
1. The technology has not been reported at home and abroad. After the Ministry of Education identified it, the project has reached the international advanced level (Zhengzi [Teacher SW2003] No. 008). In order to improve the extraction of gold and reduction of gold cyanide tailings smelting of environmental pollution, the use of catalytic oxidation of refractory gold cyanide tailings, these minerals can be wrapped in gold sulfide, arsenic compounds out catalytic oxidation, Increase the chance of gold contact with the leaching agent, which can increase the recovery rate of gold. Meanwhile integrated recovery of silver, copper, lead and other valuable elements, and wherein the use of large amounts of iron, produced ultrafine iron-based transparent pigments. The project has passed the appraisal by the Ministry of Education, applying for and approving two patents: CN1351963 “A process for preparing iron red by cyanide gold extraction waste residueâ€; CN1352310 “A process for gold extraction by cyanide gold extraction waste residue.
2. The tailings of the refractory gold ore and gold smelting cyanide tailings after catalytic oxidation only account for about 20% of the ore (determined by the nature of the ore), and the extraction rate of elements such as gold, silver, copper and iron reaches 99%. Above, the method solves the problem of low recovery rate of gold concentrate containing more iron sulfide or arsenic, maximizes the recycling of valuable elements, and solves the environmental pollution caused by tailings dumping in the gold smelting industry. The problem has obvious social benefits.
3. Dealing with 50,000 tons of gold concentrate or tailings, with an investment of 70 million yuan, the company can obtain comprehensive benefits of more than 30-70 million yuan.
4. The technology has been tested and piloted to build a factory.
5, due to the vast diversity of mineral resources, first make a feasibility report, and then do technology transfer.
Second, the comprehensive use of electronic waste:
1. With the rapid development of China's economy and the improvement of people's living standards, the possession and waste of electronic appliances are increasing. Since 2003, at least 5 million computers, tens of millions of mobile phones (over 1 million tons of mobile phones and computers), 5 million TV sets, 4 million refrigerators and 6 million washing machines have been scrapped every year. However, due to the lack of systematic and complete recycling methods and effective regulatory measures, the pollution problems caused by waste electronic appliances have become increasingly prominent. Electronic waste containing lead, arsenic, cadmium, chromium, fluorine, bromine, and other pollutants, further comprising gold, copper, tin, tantalum, niobium and other precious metals. Irregular treatment and disposal methods have caused serious environmental pollution. Therefore, the scientific value of electronic waste is of great significance in terms of its economic value and environmental protection. It turns out that from a 1 ton electronic board (mobile phone and computer), 130 kilograms of copper, 0.45 kilograms of gold, and 20 kilograms of tin can be separated, and the value of only the separated gold is thousands of dollars.
2. The extraction rate of various metals is 99%, the utilization rate of organic matter is 100%, and the resource utilization rate is 90%, eliminating the pollution of lead and other elements.
3. According to the preliminary research of the research group, the treatment of electronic waste can obtain certain economic benefits. According to the annual processing of 50,000 tons of electronic waste (circuit board, casing, etc.), the total investment is estimated to be 80 million yuan. The average electronic waste per ton contains 100 grams of gold, 1 gram of gold is sold for 95 yuan (including 99.99 gold), and the treatment of each ton of electronic waste includes physical separation of waste, chemical oxidation treatment, separation of precious metals and harmless treatment of harmful elements. About 5,000 yuan, the collection cost of electronic waste is 1,000 yuan, and other expenses are 405 yuan. The gold extraction rate is 99%, and the sales income is 9,405 yuan, so the processing of 1 ton of electronic waste can obtain a gross profit of 3,000 yuan. In addition, metals such as copper, iron, bismuth, antimony and silver can also obtain certain profits. It is estimated that the economic benefits will be improved after large-scale processing of electronic waste.
4, the small test has been completed, cooperative development.