自流井采卤制盐历史悠久,早在公元六世纪就开始生产卤水。近百年来又相继在大坟堡、郭家坳、大山铺及威西地区发现了储量丰富的盐矿,给自贡制盐及盐化工生产提供了宝贵的原料。卤水一般分为黄卤、黑卤和岩盐卤三种,其产出层位和化学成分各有差异。 Artesian mining brine salt has a long history, as early as the sixth century AD began to produce brine. Over the past 100 years, they have discovered abundant salt mines in the large grave forts, Guojia Au, Dashanpu and Weixi areas, and provided precious raw materials for salt production and salt chemical production in Zigong. Brine is generally divided into yellow halogen, black brine and brine brine three kinds of output levels and chemical composition of each difference.