According to the survey, about 80% of China's rock gold mines use the flotation method to select gold, and the produced concentrates are sent to the non-ferrous smelters for treatment. Due to the increasing development of gold by cyanidation and the improvement of economic benefits and reduction of concentrate transportation losses, the product structure has undergone major changes in recent years, and more local treatment has been adopted (of course, due to the contradiction between pricing and smelting Such problems, forcing the mine to deal with it on its own, have led to a major development in the flotation process and occupy a considerable position in gold production. There are usually two processes of preferential flotation and mixed flotation. In recent years, there have been new progress in process modification and pharmaceutical addition systems, and the flotation recovery rate has also increased significantly. According to the survey of flotation process indicators in more than 40 gold selection plants across the country, the recovery rate of sulphide ore flotation is 90%, a few are as high as 95% to 97%; the recovery rate of oxidized ore is about 75%; 85%. In recent years, there have been many innovations and research results in the flotation process, and the results have been obvious.
The phase grinding process and the heavy-floating combined process are the main trends in the development of flotation process in China. For example, the Xiangxi Gold Mine adopts the heavy-floating combined process to select the stage grinding stage and obtain better indicators. The recovery rate is increased by more than 6%; Jiaojia Gold Mine, Wulong Gold Mine, Wenyu Gold Mine, Dongpu Gold Mine, etc. Get a certain effect. Another example is the Xincheng Gold Mine. The original process is direct flotation of the ore. Due to the high mud content (the ore itself is high in mud, and the filling strength of the tailings is not enough, the mud sand is brought in), the ore dressing index is continuously decreased. After the test, the sludge sand separation process was adopted, the recovery rate was increased from 93.05% to 95.01%, and the concentrate grade 135g/t was increased to 140g/t, which stabilized the production. As the ore grade of the gold mine has decreased year by year, the flotation index has been reduced. The joint flotation process has been carried out with the Shenyang Golden Academy and other units to improve the flotation index and concentrate grade. This scientific research result (in January 1988, the Gold Corporation passed the technical appraisal), which has gained new enlightenment for the flotation process. Of course, the flotation method is not omnipotent like other methods. It is impossible to be effective for all gold-bearing ores. It is mainly necessary to consider the nature of the ore. When selecting the mineral processing process, it is necessary to carry out various demonstrations and tests.
In recent years, in order to improve the sorting effect, while the process of mineral processing equipment has been continuously improved, many improvements and research have been made on the pharmaceutical additive system and mixed drug use, and new progress has been made in the automatic control of dosing.
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