影响不同地质材料中酸性排水动力学的化学和矿物学因素

IF 1.2 4区 农林科学 Q4 SOIL SCIENCE
Soil Research Pub Date : 2024-04-19 DOI:10.1071/sr23061
Walter A. P. Abrahão, Isabela C. F. Vasques, José D. Fabris, Jaime W. V. de Mello
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引用次数: 0

摘要

背景富含硫化物的材料产生的酸性排水(AD)会影响环境,尤其是周围的矿区。需要对酸排水进行适当的评估,以防止和补救其影响。评估酸性排水及其动力学的方法非常耗时。目的确定影响 AD 动力学的化学和矿物学特征,并提出一种估算 AD 生成量的快速方法。方法对硫化物岩石和硫代土壤样本进行化学分析,包括 pH 值、主要元素含量和酸碱度(ABA)。矿物鉴定通过 X 射线衍射仪(XRD)和扫描电子显微镜(SEM)进行。通过模拟风化(SW)试验评估了样品中硫化物的氧化率,试验中使用了或未使用 CaCO3,H2O2 的含量各不相同。排出上清液以测定 pH 值、酸度和硫酸根。主要结果AD的生成受样品中碳酸盐和硫化物含量、晶体大小和类型的影响。由于黄铁矿和小尺寸硫化物的框架结构,煤炭和硫铁矿土壤产生的 AD 更多。结论从变质岩和火成侵入岩到沉积火山岩,再到超生地质材料,硫化物氧化率和厌氧消化物的生成量从大到小逐渐增加。碳酸盐和砷抑制 AD 动力学。ABA无法预测岩土材料的AD,尤其是超基性岩土材料。SW 动态测试适用于评估 AD 动力学和酸度产生的化学计量学。意义碳酸盐和硫化物是预测多种地质环境中AD的重要特征。使用 H2O2 可以缩短评估 AD 动力学的耗时试验。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Chemical and mineralogical factors affecting the kinetics of acid drainage in different geomaterials
Context

Acid drainage (AD) production from sulfide rich materials can impact the environment, particularly the surrounding mine areas. A suitable evaluation of AD is warranted to prevent and remediate its impacts. The methods that estimate AD and its kinetics are time consuming.

Aims

To identify chemical and mineralogical features that influence the AD dynamics, and propose a fast method to estimate the AD generation.

Methods

Chemical analyses of sulfides rocks and thiomorphic soil samples included pH, contents of major elements and the acid-base accounting (ABA). Mineral identification was performed by X-ray diffractometry (XRD) and scanning electronic microscopy (SEM). The rate of sulfide oxidation in samples was evaluated through simulated weathering (SW) tests performed with different contents of H2O2, with and without CaCO3. Supernatant was drained to determine pH, acidity and S-sulfate.

Key results

Generation of AD was affected by carbonates and sulfides contents in samples, crystal sizes and types. Coal and thiomorfic soil produces more AD, due to framboidal pyrites and small sized sulfides.

Conclusions

Sulfides oxidation rate and AD generation increased from the metamorphic and igneous intrusive rocks to sedimentary-volcanic and then the supergenic geomaterials, from bigger to smaller crystal sizes. Carbonates and arsenic inhibit AD kinetics. The ABA failed to predict the AD in geomaterials, especially the ultramafic. The SW dynamic tests were suitable to assess AD kinetics and the stoichiometry of acidity production.

Implications

Carbonates and sulfides are important features to predict AD in several geological environments. Using H2O2 can abreviate the time consuming tests to assess the AD kinetics.

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来源期刊
Soil Research
Soil Research SOIL SCIENCE-
CiteScore
3.20
自引率
6.20%
发文量
35
审稿时长
4.5 months
期刊介绍: Soil Research (formerly known as Australian Journal of Soil Research) is an international journal that aims to rapidly publish high-quality, novel research about fundamental and applied aspects of soil science. As well as publishing in traditional aspects of soil biology, soil physics and soil chemistry across terrestrial ecosystems, the journal welcomes manuscripts dealing with wider interactions of soils with the environment. Soil Research is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.
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