Method for identifying coal gangue based on gamma rays

• Main Authors: LU YAN, KANG QINGTAO, LIU CHANGYOU, ZHANG NINGBO, WEI JIANQING, WANG FEILONG, LIU CHANGXI
• Format: Patent
• Language: Chinese; English
• Published: 15.08.2012
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a method for identifying coal gangue based on gamma rays. Double-energy gamma rays consisting of low-energy americium 241 gamma rays and moderate-energy cesium 137 gamma rays are adopted; and when the double-energy gamma rays penetrate through a coal gangue mixture, the attenuation degree of the low-energy americium rays is only related with coal gangue mixing degree, thickness, bulk density and the like of the coal gangue mixture, and the attenuation degree of the moderate-energy cesium gamma rays is only related with the bulk density and the weight of the mixture. The gangue rate of the coal gangue mixture is calculated according to the attenuation degrees of the two kinds of rays. A double-energy gamma ray source and a gamma ray probe are respectively arranged on two sides of a chute of a scraper conveyor in the back of a top coal caving support; a data analyzer is used for calculating the gangue rate of the coal gangue mixture according to the intensity information of the gamma ray