凤凰山银矿成立于1996年，位于广西壮族自治区隆安县，是广西最大的独立银矿床，其氧化矿和原生矿矿石量433万吨，银金属量1333吨，为大型独立银矿床。该矿原设计规模为300t/d.选矿厂于1999年开工建设，2001年1 月竣工投产，2002~2009 年逐步对选矿车间进行了技改和扩建，使选矿的生产能力达到550t/d以上。
此外渣浆泵矿石中方解石和绢云母的含量达到40%以上，故该矿较易于泥化。当磨矿细度为- 0. 074mm达到65%时，一10μm 组分的含量达到30%左右，且银含量高于原矿的品位。这部分矿泥会
What are the ore characteristics and flotation process of Fenghuangshan slurry pump silver mine?
Fenghuangshan silver mine, founded in 1996, is located in Long'an County, Guangxi Zhuang Autonomous Region. It is the largest independent silver deposit in Guangxi. Its oxidized ore and primary ore amount is 4.33 million tons, and silver metal amount is 1.333 tons. It is a large independent silver deposit. The original design scale of the mine is 300t / D. the concentrator started construction in 1999, completed and put into operation in January 2001. From 2002 to 2009, the technical transformation and expansion of the concentrator workshop were gradually carried out, so that the production capacity of the concentrator reached more than 550t / d.
(1) Properties of raw ore
The raw ore of the mine is divided into three parts: one is total oxide ore, which accounts for about 20% of the total ore in the mining area, and can not be treated by flotation method; the other is primary sulfide ore mixed with a small part of oxide ore, which is in the middle and upper part of the mining area; the other is primary sulfide ore, which is in the middle and lower part of the mining area. The concentrator mainly deals with the latter two kinds of raw ore by flotation.
The main metal minerals are pyrolusite, rhodochrosite, arsenopyrite and pyrite, followed by sphalerite, galena, chalcopyrite and a small amount or trace of tetrahedrite. The nonmetallic minerals include quartz, calcite, sericite and trace muscovite.
The ore mainly recovers silver minerals. The study of process mineralogy shows that there are many kinds of silver minerals, the embedded state is complex, the embedded particle size is fine, and the silver minerals are embedded in the sulfur manganese ore. In addition to independent silver minerals, 2.94% of silver occurs in chalcopyrite, pyrite, arsenopyrite and galena in the form of isomorphism. The wrapped silver in sphalerite is increased, while that in pyrolusite is decreased. In addition, natural silver and gold silver ores can be found in gangue minerals and pyrite. Most of the silver is submicron and disseminated in pyrite, arsenopyrite and carbonaceous, so it is a refractory ore. The chemical analysis results of raw ore are shown in table 4.4.
The results show that the main impregnation particle size of sphalerite is coarse and unevenly distributed, while that of galena is coarse and fine and unevenly distributed. See table 4.5 for details.
Other metal minerals such as arsenopyrite have a maximum size of about 0.1 mm and a minimum size of about 0.04 mm, which are generally evenly distributed. Pyrite has a maximum size of 0.15 mm and a minimum size of 0.03 mm, which are generally not evenly distributed.
In addition, the content of calcite and sericite is more than 40%, so the ore is easy to be slimed. When the grinding fineness of - 0.074mm reaches 65%, the content of - 10 μ M component is about 30%, and the silver content is higher than the grade of raw ore. This part of the slime will
The recovery of silver will be affected and the normal flotation environment will be destroyed.
(2) Beneficiation process
The process flow is shown in Figure 4.8
The ore is crushed by two-stage and one-stage closed-circuit grinding (screening and ore washing operation is added) before entering the first stage closed-circuit grinding. The grinding fineness is -0.074mm, accounting for 65%, and the concentration is 28% ~ 30%