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首页> 美国卫生研究院文献>Springer Open Choice >Hydration of dicalcium silicate and diffusion through neo-formed calcium-silicate-hydrates at weathered surfaces control the long-term leaching behaviour of basic oxygen furnace (BOF) steelmaking slag
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Hydration of dicalcium silicate and diffusion through neo-formed calcium-silicate-hydrates at weathered surfaces control the long-term leaching behaviour of basic oxygen furnace (BOF) steelmaking slag

机译：硅酸二钙的水合和在风化表面通过新形成的硅酸钙水合物的扩散控制了碱性氧气炉（BOF）炼钢渣的长期浸出行为

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Alkalinity generation and toxic trace metal (such as vanadium) leaching from basic oxygen furnace (BOF) steel slag particles must be properly understood and managed by pre-conditioning if beneficial reuse of slag is to be maximised. Water leaching under aerated conditions was investigated using fresh BOF slag at three different particle sizes (0.5–1.0, 2–5 and 10 × 10 × 20 mm blocks) and a 6-month pre-weathered block. There were several distinct leaching stages observed over time associated with different phases controlling the solution chemistry: (1) free-lime (CaO) dissolution (days 0–2); (2) dicalcium silicate (Ca2SiO4) dissolution (days 2–14) and (3) Ca–Si–H and CaCO3 formation and subsequent dissolution (days 14–73). Experiments with the smallest size fraction resulted in the highest Ca, Si and V concentrations, highlighting the role of surface area in controlling initial leaching. After ~2 weeks, the solution Ca/Si ratio (0.7–0.9) evolved to equal those found within a Ca–Si–H phase that replaced dicalcium silicate and free-lime phases in a 30- to 150-μm altered surface region. V release was a two-stage process; initially, V was released by dicalcium silicate dissolution, but V also isomorphically substituted for Si into the neo-formed Ca–Si–H in the alteration zone. Therefore, on longer timescales, the release of V to solution was primarily controlled by considerably slower Ca–Si–H dissolution rates, which decreased the rate of V release by an order of magnitude. Overall, the results indicate that the BOF slag leaching mechanism evolves from a situation initially dominated by rapid hydration and dissolution of primary dicalcium silicate/free-lime phases, to a slow diffusion limited process controlled by the solubility of secondary Ca–Si–H and CaCO3 phases that replace and cover more reactive primary slag phases at particle surfaces.Electronic supplementary materialThe online version of this article (10.1007/s11356-018-1260-7) contains supplementary material, which is available to authorized users.
机译：如果要最大程度地利用炉渣，必须通过预处理适当地理解和管理从碱性氧气炉（BOF）钢渣颗粒中产生的碱度和有毒的痕量金属（例如钒）。使用三种不同粒径（0.5–1.0、2–5和10××10××20 mm块）和6个月预风化块的新鲜BOF炉渣研究了充气条件下的水浸出。随着时间的推移，有几个不同的浸出阶段，与控制溶液化学的不同阶段有关：（1）游离石灰（CaO）溶解（第0至2天）； （2）硅酸二钙（Ca2SiO4）溶解（第2–14天）和（3）Ca–Si–H和CaCO3的形成以及随后的溶解（第14–73天）。尺寸分数最小的实验导致最高的Ca，Si和V浓度，突出了表面积在控制初始浸出中的作用。大约2周后，溶液中的Ca / Si比（0.7-0.9）演变成等于在Ca-Si-H相中发现的值，该相替换了在30至150μm改变的表面区域中的硅酸钙和游离石灰相。 V释放是一个分为两个阶段的过程。最初，V通过硅酸二钙的溶解而释放，但V也同晶型地替代了Si，形成了蚀变区中新形成的Ca–Si–H。因此，在更长的时间范围内，溶液中V的释放主要受Ca-Si-H溶解速率相当慢的控制，这使V的释放速率降低了一个数量级。总体而言，结果表明，BOF炉渣的浸出机理已从最初以快速水合和一级硅酸二钙/游离石灰相的溶解为主的状态演变为由次级Ca–Si–H和CaCO3相替代并覆盖了颗粒表面的更多反应性主要渣相电子补充材料本文的在线版本（10.1007 / s11356-018-1260-7）包含补充材料，可供授权用户使用。

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