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微生物的粘附对矿物的溶解有较大影响.本文通过对比实验,利用透析的方法,系统研究了钙长石与多粘芽孢杆菌(Paenibacillus polymyxa)及其大分子代谢产物直接接触和无接触(透析)时的溶解行为.实验结果表明,在实验持续的10天内,细菌作用下钙长石的溶解显著加速,同时伴有纳米级次生沉淀的生成(只在接触实验中)及钙长石表面相对于Si贫Ca,Al的淋滤层的形成.对有菌的接触和透析实验,元素Ca,Al和Si的溶出特征差异明显,主要表现为:Ca在透析条件下的溶出能力显著强于接触条件下,而Al和Si正相反.这一溶出差异性表明,在机理上钙长石中Ca的溶出主要与质子交换作用有关,Al和Si的溶出则主要与配体络合作用优先破坏其架状结构中的Al-O-Si键有关.研究同时表明,在溶解动力学上,Ca的溶出主要受表面反应和淋滤层扩散控制,粘附的细菌会通过抑制表面反应以及Ca向溶液中的扩散来影响其溶出动力学;Al和Si的溶出则主要受表面反应控制,细菌的粘附可以加速该动力学过程.
Microbial adhesion has a great influence on the dissolution of minerals.In this paper, through comparative experiments, the dialysis method was used to systematically study the direct and non-contact of the albite with Paenibacillus polymyxa and its macromolecular metabolites Dialysis) .The experimental results showed that the dissolution of the albite accelerated significantly under the action of bacteria within 10 days of the experiment, accompanied by the formation of nanoscale secondary precipitation (only in the contact experiment) and the addition of the calcium feldspar The formation of the leaching layer on the surface relative to Si-poor Ca and Al.Under the contact and dialysis experiments with bacteria, the dissolution characteristics of the elements Ca, Al and Si were significantly different, mainly as follows: Ca dissolution ability under dialysis was significantly stronger Under the contact conditions, whereas Al and Si are the opposite, this dissolution difference indicates that the mechanism of Ca dissolution in the calcium feldspar is primarily related to the proton exchange, whereas the dissolution of Al and Si is primarily the ligand complexation priority Destroying the Al-O-Si bonds in the framework structure of the framework.Research also showed that in the dissolution kinetics, the dissolution of Ca was mainly controlled by the surface reaction and the diffusion of the leaching layer, the adhered bacteria could inhibit the surface reaction and Ca Expansion to the solution To influence the dissolution kinetics; dissolution of Al and Si is mainly controlled by the surface reaction, the bacterial adhesion can be accelerated kinetics.