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本文描述了铝土矿生物选矿放大中的某些微生物和工程方面的重大问题。最近证明一种土壤细菌 (多粘芽胞假单胞菌 )可以从作磨料和耐火材料用的贫铝土矿 ( <5 0 %Al)中选择性脱除杂质钙和铁。一种以甘蔗糖和自来水 (或 )矿山水为基础的布氏介质 (称为ISF 2配方 )被开发出来 ,成功地在腐败条件下培养出多粘芽胞假单胞菌。该培养液在全循环矿浆反应器串接操作中足以除去铝土矿中的钙。在用预生长的培养液进行的串接浸出试验中 ,观察到在开始几分钟的快速生长期内脱钙只是以间接作用机制发生 ,然后在渐增期内既有间接作用机制 ,也有直接作用机制。间接浸出机制是根据可溶钙在培养代谢物中的增溶作用提出的 ,钙的溶解量一直达到钙的饱和溶解度极限。用饱和溶解度理论可解释串接试验的必要性 ,也可成功预测脉冲浸出试验的可能性。这些最新进展可能对铝土矿的生物选矿技术将来的工业化是有益的
This article describes some of the major issues in the engineering of certain microorganisms in the amplification of bauxite bio-beneficiation. It has recently been demonstrated that a soil bacterium, Pasteurella multocida, can selectively remove impurity calcium and iron from poor bauxite (<50% Al) used as an abrasive and refractory material. A Brinell-based medium (called ISF 2 formulation) based on cane sugar and tap water (or mine water) was developed to successfully cultivate Pseudomonas polymyxa under spoilage conditions. The broth is sufficient to remove calcium from the bauxite during the full circulation slurry reactor concatenation. In the in-line leach assay with pre-grown broth, it was observed that decalcification only occurred as an indirect mechanism of action during the first few minutes of rapid growth, followed by both an indirect mechanism of action and a direct effect mechanism. The indirect leaching mechanism is based on the solubilization of soluble calcium in cultured metabolites, and the amount of calcium dissolved reaches the limit of saturated solubility of calcium. The theory of saturation solubility can explain the necessity of a tandem test, and the possibility of a pulsed leach test can also be successfully predicted. These latest developments may be beneficial to the future industrialization of bio-beneficiation of bauxite