关键词: 磁铁矿, 预先细筛, 弱磁选

Abstract: The micro-fine disseminated magnetite ore from Fujian use grind-separation flow in field，iron grade of the concentrates are less than the product quality requirements.The field crude concentrate mineral properties analysis results showed that the monomer material have about 60% in it，magnetic iron share is 95.13%，it's suitable for handling a single low intensity magnetic separation craftwork.Following the condition test of low intensity magnetic separation field strength and middles regrinding the degree of fineness，then has conducted the screening classification-under the screen 2 segment low intensity magnetic concentration on the screen middles regrinding-grinding product 2 segment low intensity magnetic concentration flow test，which finally can obtain iron concentrates of iron grading 64.18%,the iron recovery 95.41%.Test flow is simple and efficient test to handle the ores.

Key words: Magnetite ore, Pre-fine screening, Low intensity magnetic separation