高浸出稳定性臭葱石组成与结构特性及其调控规律

Arsenic is accompanied widely in non-ferrous metal ores, and its application is becoming increasingly shrinking，owing to its hypertoxic and carcinogenic properties. In non-ferrous metallurgy, removing arsenic from materials bearing high content of arsenic, then immobilizing and safely stockpiling it, is a reasonable approach to solve arsenic hazard..Up to date, scorodite is accepted universally as the most effective arsenic immobilization mineral and its leaching stability is a key indicator for safely stockpiling arsenic immobilizing materials. Aiming at the problem that the leaching stability of scorodite samples precipitated in aqueous solutions fluctuates widely, research is proposed to carry out mainly in following two aspects: firstly, the effects of compositional and structural properties of scorodite, such as doping of sulfate as well as resulting Fe/As variation, impure phase precipitation, crystallinity, crystal planes encapsulating the particle (morphology), particle size and its distribution and particle surface condition, on the leaching stability of scorodite; secondly, the particle formation mechanism of scorodite precipitated in aqueous solutions and the rules controlling secondary nucleation, particle aggregation and formation of the particles with different morphologies in the precipitation process of scorodite..Through the research mentioned above, the relationships among the synthesis condition, and the formation mechanism, the compositional and structural properties, as well as the leaching stability of scorodite particles will be elucidated, and a solid basis for the synthesis of scorodite particles with excellent leaching stability will be set up from both aspects of principal and technological prototype.The research results can also deepen the understanding of mineral leaching and element migration in nature.

砷广泛伴生于有色金属矿中，由于其剧毒、致癌特性，应用日趋萎缩。从高砷物料中将砷脱除、固化堆存，是有色冶金砷害治理的合理途径。.臭葱石是迄今公认最有效的固砷矿物，它的浸出稳定性决定其能否安全堆存。针对液相沉淀臭葱石浸出稳定性波动大的问题，主要开展以下两方面研究：一是臭葱石组成与结构性能，如硫酸根的掺入及由此所致的Fe/As摩尔比变化、杂相生成、结晶度、颗粒包围晶面（形貌）、粒度及其分布、颗粒表面状况等，对其浸出稳定性的影响；第二，臭葱石液相沉淀中颗粒形成机理，以及二次形核、团聚和不同形貌颗粒发生或形成的控制规律。研究揭示臭葱石制备条件与其颗粒形成机理、组成与结构性能以及浸出稳定性之间关系，在此基础上，确定浸出稳定性高的臭葱石制备技术体系及其原理。研究结果也能加深对矿物浸出及自然界中元素迁移规律的认识。