I. Introduction Low Xiushui Jiangxi Copper Lead Zinc content, the lower limit for the cut-off grade, a wide range of mineral ore, copper and lead useful minerals fine grain size, disseminated complicated relationship, is a refractory metal copper - lead - zinc mine. In order to comprehensively utilize and rationally and effectively recover mineral resources, improve the economic benefits of mines, and select suitable beneficiation processes to enable the development and utilization of copper, lead and zinc, it is an urgent task for the mine. Second, the nature of the ore The ore minerals are relatively complex, and there are as many as 25 minerals identified. The metal minerals include iron sphalerite, sphalerite, chalcopyrite, galena, pyrrhotite, pyrite, arsenopyrite, magnetite, Copper ore, Lanhui copper, Tonglan, porphyrite, limonite, hematite, scheelite , etc. Gangue minerals are quartz, chlorite, illite, calcite, fluorite, garnet, epidote, dolomite, zircon, white mica. Main chemical element analysis results (%) are: Cu 0.26, Pb 0.37, Zn 10.87, S 30.48, Fe 37.80, SiO 2 10.06, Ca03.10, AI 2 O 3 18, Ag 74.08 g/t. Copper minerals exist in the form of chalcopyrite. Chalcopyrite is often produced in the form of star-like particulate solid solution in iron sphalerite. The particulate chalcopyrite is generally difficult to dissociate/lead from iron sphalerite. Minerals exist in the form of galena. Zinc minerals are produced by iron sphalerite and sphalerite in the form of its shape, semi-self-formed granular form and aggregates, which are closely co-existing with pyrrhotite and pyrite. Chalcopyrite and galena are generally finer in size, generally 0.015~0/15ram, and the 0/074ram monomer segregation is only 57.89% and 60.00% respectively. The iron sphalerite is medium-fine-grain grade, generally 0.07-0.58 mm, and the monomer dissociation degree is 83%/-0.074 ram. The iron sphalerite and galena, chalcopyrite and pyrite are produced in fine veins. A considerable part of the copper-lead minerals are micro-encapsulated minerals, which are intertwined with each other to form a complex symbiotic relationship. The ore dressing is difficult. Useful minerals have a higher loss in tailings. Third, the beneficiation test The copper lead in this mine has a low grade, fine disseminated grain size, and dense symbiosis of many useful minerals. Domestic and foreign ore dressing practices show that the selection of such ore sorting indicators is generally not high. According to the experience of exploration and most of the selection of plants, the use of cyanide-free flotation mixed copper and lead minerals, inhibition of zinc minerals, and then copper and lead separation / from Recovery of zinc minerals in mixed tailings. (1) Copper-lead mixing test Better results can be obtained by special effects and selecting the best formula. The mixed floatation is mixed with butylammonium black and butyl xanthate, which has a significant improvement in the efficacy and strong ability to capture copper, lead and silver . The pH value of the slurry is very sensitive. The control of lime can effectively inhibit the iron sulfide ore. The water glass inhibits the quartz. The combination of zinc sulfate and sodium sulfite can enhance the inhibition of zinc minerals. The foaming agent uses a new type of pine oil 12, which has strong foaming properties. The foam is stable. (2) Copper and lead separation test It is well known that the separation of copper and lead is a problem, especially in dealing with complex intercalation and low grade ore. There is a large amount of excess agent in copper-lead mixed, which has an adverse effect on separation. Therefore, removing mineral surface agents is an indispensable technical link. Compared with drug removal by multiple schemes, desorption of detoxification with activated carbon is convenient and convenient to use. Tests show that the conventional method of suppressing lead floating copper, chromium weight was explored potassium, potassium dichromate and sodium silicate, potassium dichromate and sodium sulfide minerals lead agent inhibits three compositions, used alone potassium dichromate It can effectively achieve the effective separation of copper and lead. A qualified copper concentrate can be obtained. (III) Decontamination test of crude lead concentrate After the separation of copper and lead, the grade of lead concentrate is only about 4%. The lead concentrate contains a lot of zinc minerals, copper minerals, pyrrhotite and gangue. In order to make the lead concentrate meet the standard, the crude lead concentrate and sodium sulfide are added to remove residual dichromate, and then sulfuric acid and chlorine are added. Sodium sulphate is used to convert galena, and zinc sulphate and sodium sulfite are used to inhibit zinc minerals. The mixture is floated with a mixture of drugs. The selection effect is not good. Only the difference in mineral density in the crude lead concentrate is used. , qualified lead concentrate products can be obtained. (4) Zinc flotation test The key to zinc ore selection after copper and lead is the activation of sphalerite and the pH of the slurry. Copper sulphate is an effective activator of zinc minerals. It inhibits the pyrite in the ore by using lime to strongly suppress and adjust the pH value of the pulp to 9 or more. The other chemicals are the same as the copper-lead mixed float. The second selection and one sweeping can obtain better zinc concentrate indicators. (5) Closed circuit test Comprehensive recovery of copper, lead and zinc in the best technical conditions of copper-lead partial mixing, selective separation and zinc-selecting, and recovery of silver in lead concentrate. The closed circuit process and test indicators are shown in the figure below and the table below. Road process test and condition map The dosage unit is g/t; the mixed drug is butyl ammonium black butyl yellow drug = 1:1 Closed Circuit Test Results Table /% Fourth, the conclusion The floating-re-separation separation of copper-lead-zinc composite sulfide ore is successful using copper-lead mixed-dissolution and re-selection of the shaker to purify lead. The process scheme is suitable for ore characteristics, simple process, wide source of medicament, short process, stable index, meet environmental protection requirements, easy to produce and implement, and finally obtain three qualified concentrate products of copper, lead and zinc, and comprehensively recover silver in lead concentrate. It has opened up new avenues for the comprehensive recycling of this type of polymetallic ore. Author unit Hunan Institute of Information Technology (Xu Yunshou) Hunan Minerals Testing and Utilization Research (Cai Youxing) As their name implies, the sliding contact surfaces of Angular Contact Spherical Plain Bearings are spherical in shape and inclined at an angle to the bearing axis . Consequently, these bearings are well suited for accommodating combined (radial and axial) loads. Single angular contact Spherical Plain Bearings can only accommodate axial loads acting in one direction. These bearings can be separated, enabling the rings to be mounted separately. Angular Contact Spherical Plain Bearings Angular Contact Spherical Plain Bearings,Angular Contact Thrust Spherical Plain Bearings,Angular Contact Spherical Bearings,Angular Radial Spherical Plain Bearing Ningbo Ritbearing Imp & Exp Co.,Ltd. , http://www.ritbearingchina.com
manufactures steel/PTFE FRP (fibre reinforced polymer containing PTFE) maintenance-free angular contact spherical Plain Bearings as standard. Designs with other sliding surface combinations are available on request (Special designs).