一、硫脲工艺的发展概况 硫脲是很有前途的无毒溶金试剂之一 早在1941年和1960年,苏联的和就先后研究了金和银溶解于硫脲弱酸性溶液中的物理——化学条件及各种影响因素,指出:(1)金的溶解速度与溶液中的硫脲浓度成正比;(2)金可以在硫酸、盐酸及硝酸的硫脲溶液中溶解,但以硫酸较好;(3)双氧水、过氧化钠、氯化铁和硫酸 First, the development of thiourea process Thiourea is one of the promising non-toxic gold-dissolving reagents As early as 1941 and 1960, the Soviet Union and has studied gold and silver dissolved in thiourea weak acid solution in the physical - - chemical conditions and various influencing factors, it is pointed out that: (1) the dissolution rate of gold is directly proportional to the concentration of thiourea in the solution; (2) gold can be dissolved in thiourea solution of sulfuric acid, hydrochloric acid and nitric acid, Good; (3) hydrogen peroxide, sodium peroxide, ferric chloride and sulfuric acid