Our resources are very rich in gold, since ancient times is one of the countries rich in gold. In the period of Shang and Zhou, there is a written record of gold mining. In the feudal society of more than two thousand years, the development of mining technology has been slow. Before the 20th century, gold mining was the mainstay, and the production process was still very backward. Pvc Pipe,Plastic Pvc Pipe,Rounded Pvc Pipe,Size Customized Pvc Pipe Ningbo Yongsheng Rubber And Plastic Products Co., Ltd. , https://www.yscnrubber.com
Since the ancient dynasties, the feudal dynasty did not have accurate statistics on the production of gold. According to historical records, during the reign of Emperor Guangxu in the Qing Dynasty (1888), China’s domestic gold accounted for 7% of the total world gold production at that time, ranking fifth in the world.
After liberation, the party and the government attached great importance to gold production and formulated a series of preferential policies, which greatly mobilized the enthusiasm for producing gold. A number of mines have been newly built, expanded and rebuilt, dozens of gold mining vessels have been put into production, and new technologies, new processes and new equipment have been introduced continuously, which has greatly improved the appearance of gold production in China.
According to statistics, more than 30 provinces, municipalities and autonomous regions in China have gold deposits, and more than 1,000 counties have discovered gold deposits, accounting for more than 45% of the 2130 counties in the country.
Since the 1970s, China's pulse gold production accounted for 75 to 85%, and gold production accounted for 15 to 25%. The proven reserves and economically viable reserves of China's gold are also considerable. After many years of geological work, most of the gold deposits that have been discovered are small and medium-sized, of which the reserves of vein gold resources account for about 42% of total gold reserves, and that of gold deposits account for 12%. Others are associated gold reserves. It can be expected that the proportion of gold produced in the future will increase significantly.
In the past few years, new technologies, new equipment, and new processes have been introduced and put into production in the production of gold. The smelting process, machinery and equipment and production indicators have reached a new level. The original cyanidation method has been continuously improved; the carbon slurry method has been adopted in many mines; the heap leaching method has been widely used for gold extraction. The thiourea method was put into operation in a gold mine in Guangxi in December 1987 and passed the ministerial appraisal.
In China, gold-bearing sulfide ore is generally selected by flotation process. In recent years, some mines have been continuously innovated, using stage grinding, stage sorting, branch flotation, mixed use of drugs, so that the flotation process is continuously improved, and the selection index has been further improved. For example, the concentrate grade of a gold-selecting factory is 100-120. In grams per ton, the recovery rate is over 95%.
China's ancient and modern gold production