酸性氨基酸在铜、铅、锌迁移与沉积过程中的作用

对酸性氨基酸(谷氨酸)在铜、铅、锌迁移与沉积过程中的作用,进行了模拟实验研究。结果表明,酸性氨基酸在热卤水中的存在,比中性氨基酸更有利于铜、铅、锌的活化迁移。但是,随作用时间,特别是随温度的变化,不同金属在热液中的活化迁移情况则明显地不同。这表明金属与氮基酸形成的易溶络合物,其稳定性不仅与金属和氨基酸的种类有关,而且还受温度的直接影响。

ROLE OF ACIDIC AMINO-ACID IN THE PROCESS OF TRANSPORTATION AND DEPOSITION OF COPPER, LEAD AND ZINC

According to the possible presence and type of amino scids in ore-forming solutions, the authors performed a model expeimental study on the role of acidic amino acid(glutamic acid)in the process of transportation and deposition of copper, lead and zinc. The result shows that thermal brines containing acidic amino acid are mere favourable than those containing neutral amino acids to the activation and transportation of copper, lead and zinc. But the activation and transportation of vavious metals in thermal brines will obviously vary with time and especially temperature. It shows that for the easy dissoluble complexes, their stability is related to not only the type of metals and amino acids, but also directly affected by temperature. The disolution amount of chalco pyrite in thermal solution containing glutamic acid can increase with increasing temperature from 90℃ to 210℃. But the dissolution of galena are completely reverse to the chalco pyrite. The dissolution amount of sphalerite reaches a maximum at the temperature about 150℃. It indicates that the temperature about 150℃ is the most effec rive range for precence and transportation of zinc-glutamic acid complexes. But at temperature above 180℃ the complexes will be obviously de composed, and hence sphalerite is deposited. This situation is consistent with the transportation and deposition of lead in ther:nal brines containing neutral amino-acids,