Around 80% of the rock in China tin beneficiation plant portable trommel flotation method is used to choose gold, gold concentrate more sent to the output of nonferrous smelting processing. Due to the growing development of the cyanidation of gold, and the enterprise to improve economic efficiency, reducing loss of concentrate transport, so many take on-site processing (of course, due to problems such as the contradiction between the mineral intergrowth and valuation, forcing mines in situ disposal) prompted flotation technology has larger development, occupies coltan ore processing an important position in the gold production. There are usually two preferential flotation and mixed flotation process. Because the process modification and reagent adding system have new progress, flotation recovery rate is improved obviously. According to the national more than 40 gold factory, flotation index survey results show that the sulphide ore flotation recovery rate is 90%, the minority is as high as 95% ~ 97%; Oxidized ore recovery was 75%; Individual reached 80% ~ 85%. Production practice, the flotation process of renovating and many scientific research achievements, the effect is obvious. Floating stage grinding process, the heavy - float joint process, etc., is the main trend of development of flotation technology in China. Use heavy - floating joint process, such as xiangxi gold mine of stage grinding stage, don't get a good indicators, improve the recovery of over 6%; Jiaojia gold mine, wulong gold mine, valley, east into gold also have certain effect. And as xincheng gold mine, the original process for ore flotation directly, because the mud is higher (high mud ore itself, plus mining backfilling cementation filling strength is not enough, part into mud) continuous decline in the index of mineral processing.
Through examination test, used the mud separation process, using the cyclone static micro-bubble flotation column floatation slime, recovery rate from 93.05% to 95.01%, concentrate grade 135 g to 140 g/t/t, stable production. Gold factory valley gold dropped year by year because of the ore grade, thus reduce the index of flotation, as compared with the experimental research of shenyang institute of gold and other Portable gold trommel units cooperation with branch flotation process, improve the grade of the flotation index and concentrate. The scientific research achievements (in January 1988 gold corporation passed the technical appraisal), got the new enlightenment for flotation process modification. Flotation Carbon in Pulp method and other methods, of course, is not everything, can't be effective for all gold ore, the main consideration ore properties, in the selection process, various arguments and the experiment was carried out.