方铅矿、闪锌矿和黄铜矿在含有氨基酸的热卤水中溶解性的实验研究

AN EXPERIMENTAL STUDY ON SOLUBILITY OF GALENA, SPHALERITE AND CHALCOPYRITE IN HOT BRINE CONTAINING AMINO ACIDS

根据氨基酸在成矿溶液中存在的可能性,继铅、锌、铜在含有中性及酸性氨基酸热卤水中迁移与沉积作用的实验研究之后,作者对方铅矿、闪锌矿和黄铜矿在含有碱性氨基酸——赖氨酸热卤水中的溶解性,进行了模拟实验研究。结果表明,在含碱性氨基酸的热卤水中,从90～210℃的温度范围内,铅与锌的溶解量均从增到减,铅于150℃时达最大值(约4×10^(-6));锌于120℃时达最大值(约800×^(-6));铜的溶解量则于90℃时即达最大值(约80×10^(-6)),其后随温度升高而呈锐减趋势。这说明铅、锌、铜与氨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直接相关,而且还受温度的显著影响。

In view of the probable existence of amino acids in ore-forming solutions and the presence of different types of amino acids, the authors, after making simulation experimental study on the role of neutral and acid amino acids in the dissolution and deposition of galena, sphalerite and chalcopyrite, conducted simulation experimental study on the solubility of galena, sphalerite and chalcopyrite in hydrothermal solutions containing alkaline amino (lysine). The results show that the Iole of hot brine containing amino acids in the mobilization and migration of lead, zinc and copper or the stability of readily-soluble complexes formed by amino acids with lead, zinc and copper is not only related to the types of metals and amino acids but also affected obviously by temperature. For the readily-soluble complex formed by neutral amino acid (glycine and alanine) with lead, 150℃ or so seems to be the most suitable temperature for its·existence and migration. Above 200℃, the complex will be obviously decomposed, leading to the precipitation of galena. In the range of 90～210℃, the solubility of chalcopyrite in hydrothermal solutions containing acid amino acid (glutamic acid)increases with rising temperature. Nevertheless, things are just the opposite for galena. Sphalerite reaches its highest solubility at some 150℃, suggesting that 150℃ or so is the best temperature for the presence and migration of the complex of zincglutamic acid. Above 180℃, the complex will be strongly decomposed. In the range of 90～210℃, the solubility of chalcopyrite in hot brine containing alkaline amino acid (lysine) decreases with rising temperature. The olubility of galena and that of sphalerite reach the highest value at 150℃ and 120℃ respectively, indicating that 120～150℃ is the most effective temperature range for the existence and migration of zinc-lysine and lead-lysine complexes. Above 150℃, the complexes will be apparently decomposed, resulting in the deposition of galena and spnalerite. This is very similar to the migration and deposition of lead in hot brine containing neutral amino acid and zinc in hot brine containing acid amino acid.