NDLI: Hydrological Evaluation of Gold Leach Pad Rinsing

Content Provider	Springer Nature Link
Author	Zhan, Guosheng Haggarty, Steve Ludwick, William
Copyright Year	2012
Abstract	Leach pad closure is a site and material specific consideration. This paper presents a summary of analytical and field studies conducted to determine the requirements for rinsing heap leach residue in conjunction with reclamation activities. An analytical model, based on simple dilution, was proposed for projecting changes in cyanide concentration following fresh water rinsing. A 23-month field test utilizing three test heaps verified that the weak acid dissociable cyanide concentration of effluent from the heaps was being reduced by half for each bed volume of fresh water applied to the pilot-scale test heaps. Whether rinsing is a valid part of closure depends on hydrogeologic and geochemical conditions within the heap and may not be appropriate in all cases.Welche Methode angewendet wird, um einen Erzhaufen der Goldlaugung zu sanieren ist eine Material- und Ortsabhängige Entscheidung. Dieser Artikel stellt eine Zusammenfassung von Analysen und Geländeuntersuchungen dar, die durchgeführt wurden, um festzustellen, welche Maßnahmen nötig sind, um einen Laugungshaufen im Zusammenhang mit einer Sanierungsmaßnahme zu spülen. Ein analytisches, auf Verdünnung beruhendes Modell, wurde vorgeschlagen um die Änderungen in der Zyanidkonzentration im Verlauf der Spülung mit Frischwasser vorherzusagen. Wie der 23-monatige Geländeversuch mit drei Laugungshaufen belegte, wird die Konzentration des in schwacher Säure dissoziierbare Zyanids im Abfluss der Haufen pro eingebrachtem Bettungsvolumen Frischwasser um die Hälfte erniedrigt. Ob die Spülung ein sinnvoller Teil der Auflassung ist, hängt von den hydrologischen und geochemischen Bedingungen im Haufen ab und mag nicht in allen Fällen praktikabel sein.El cierre de una operación de lixiviación debe ser considerado específicamente para el sitio y el material en consideración. Este trabajo presenta un resumen de estudios analíticos y de campo dirigidos a determinar los requerimientos para el enjuague de los residuos de lixiviación de la pila junto con actividades de recuperación. Un modelo analítico, basado en la simple dilución, fue propuesto para predecir los cambios en la concentración de cianuro luego del enjuague con agua fresca. Un test a campo de 23 meses utilizando 3 pilas verificó que la concentración de cianuro WAD del efluente de las pilas se redujo a la mitad por cada volumen de agua fresca aplicada a las pilas a escala piloto. Determinar si el enjuague es una parte válida del proceso de cerrado depende de las condiciones hidrogeológicas y geoquímicas dentro de la pila y puede ser no apropiado en todos los casos.废弃堆浸矿堆的封闭处理需要考虑堆浸位置、物性等条件。在水文地质分析与野外试验基础上,本文研究了洗涤堆浸矿堆中残留物的应用条件。依据简单稀释试验建立了经清水洗涤后堆浸矿堆残余氰化物浓度的预测模型。同时,三个试验堆历时23个月的野外试验证实,小规模试验堆每经相当于矿堆残余水量体积(bed volume)的清水洗涤后,流出物的弱酸可分离氰化物浓度(WAD cyanide concentration)将减少一半。洗涤是否为浸堆封闭处理的必要部分取决于浸堆内水文地质和地球化学条件,而且洗涤不一定适于所有浸堆封闭处理.
Starting Page	307
Ending Page	311
Page Count	5
File Format	PDF
ISSN	10259112
Journal	Mine Water and the Environment
Volume Number	31
Issue Number	4
e-ISSN	16161068
Language	Chinese
Publisher	Springer-Verlag
Publisher Date	2012-06-12
Publisher Institution	International Mine Water Association (IMWA)
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bed volume Closure Cyanide reduction Energy Economics Ecotoxicology Hydrogeology Geology Sedimentology
Content Type	Text
Resource Type	Article
Subject	Water Science and Technology Geotechnical Engineering and Engineering Geology

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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