一、发展概况汞矿石直接火法冶炼是我国多年来传统的生产工艺,矿石入炉前常常采用手选抛弃部份废石,以提高入炉矿石品位。手选废石率(占原矿)一般在40～70％,废石品位通常都高于地质边界品位0.04％,手选回收率仅60～70％。由于原矿品位逐年降低,目的矿物在含矿脉石中的分布分散,含矿脉石与围岩的界线很不分 I. Development Overview Direct pyrometallurgical smelting of mercury ore is a traditional production process in China for many years. Before the ore is put into the furnace, it is often abandoned by hand to remove some of the waste rock, so as to improve the quality of the ores into the furnace. Hand-selected waste rock rate (accounting for ore) is generally 40 to 70%, waste rock grade is usually higher than the geological boundary grade of 0.04%, hand-selected recovery of only 60 to 70%. As the grade of ore decreases year by year, the distribution of the target minerals in the ore-bearing gangue is dispersed, and the boundary between the ore-