I. Mine and ore properties The mine is located in Tanghu Township, Weishan County, Shandong Province. It was discovered by the original Jinan Geological Bureau and the 802 team during radioactive aerial survey from 1958 to 1962. The geological survey of the second team of the Provincial Geological Bureau from 1970 to 1974, the census report in December 1975. It is pointed out that the rare earth reserves in 0.85km 2 are about 2.55 million tons (REO), and the shallow parts of the main ore veins 1, 3, 4, and 12 are inspected in detail, and the C+D reserves are 120,000 tons (REO), and the average geological grade is 3.1. 3% is a quartz - barite -carbonate rare earth deposit with simple composition of minerals and gangue. It is mainly composed of fluorocarbon strontium ore and fluorocarbon strontium ore, accompanied by barite, calcite , quartz, fluorite, etc. , rare earth minerals cloth embedded coarse grain size, typically 0.5 ~ 0.0 4mm, easy to wear and easy dressing stone genus. The main chemical components of the ore are shown in Table 1. Table 1 Table of main chemical components of Weishan ore (%) Second, the beneficiation process and sorting technical indicators Weishan rare earth processing plant in 1982 formally set up factories, small-scale, original ore milled to -0.074mm 65% to 75%, adding sulfuric acid, sodium silicate, oleic acid and kerosene, in weakly acidic (pH5) pulp The rare earth minerals are flotation, and the rare earth concentrate containing REO is obtained by one rough selection, three sweeps, and three times. Between 1986 and 1989, the supporting transformation was carried out, and the mining was transferred to underground mining. The rare earth grade of the ore was reduced to 3% to 4% (the open surface ore contained REO was relatively high, generally 5% to 10%), and the original flotation agent was used for sorting effect. Unsatisfactory, in 1991, the rare earth special effect collector L102 (C6H4OHCONHOH), water glass, L101 (foaming agent) combination agent was used to float rare earth minerals in weakly alkaline (pH 8 ~ 8.5) pulp, and obtained REO> 60% rare earth concentrate with a rare earth recovery rate of 60% to 70%, and a rare earth concentrate with a REO of 32% and a recovery of 10% to 15%. From 1998 to 1999, the annual processing of ore was 40,000 tons, with an annual output of 3,500 rare earth concentrates containing REO 60%. Back Gate Lock For Gm,Door Lock For Chevrolet,Back Gate Lock Actuator,Tailgate Liftgate Lock Actuator RUIAN GLEEFUL AUTO PARTS CO., LTD. , https://www.rpc-gleeful.com