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Method for solidifying and dry-stacking mill tailings without tailing reservoir

A solidification treatment and tailings pond technology, which is applied in the field of mines and environmental engineering, can solve the problems of large tailings pond stability or environmental safety risks, and achieve the effects of saving area, low processing cost and high efficiency

Active Publication Date: 2010-12-15
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims at the current technology of tailings no matter wet stacking, dry stacking after dehydration, or dry stacking after cementation or solidification, etc. still need to set up tailings ponds, and the tailings stock has a relatively large risk of stability or environmental safety, and provides A dry storage method for solidification treatment of ore dressing tailings without tailings pond

Method used

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  • Method for solidifying and dry-stacking mill tailings without tailing reservoir

Examples

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Effect test

Embodiment 1

[0027] A lead-zinc tailings, in which the particle content of >74 microns accounts for 27.40%, the content of particles of 37-74 microns accounts for 15.90%, and the content of particles 2 Accounted for 36.79%, Al 2 o 3 1.72%, MgO 2.15%, CaO 30.15%, Fe 2 o 3Accounted for 15.11%, other ingredients accounted for 14.08%. The tailings were tested according to HJ / T299-2007 method, the leaching amount of copper in untreated tailings was 100.6mg / L, zinc was 300mg / L, cadmium was 1.3mg / L, lead was 100.8mg / L, chromium was 40mg / L, arsenic 16.21mg / L. The mass concentration of the tailings before concentration is 30%, and 60 grams of polyacrylamide or polyaluminum chloride or polyaluminum sulfate is added per ton of dry tailings, and the tailings with a mass concentration of 73% are formed after precipitation for 6 hours. Add 80 kg of cement curing agent to each tailings for mixing and stirring. After stirring, the unconfined compressive strength of the solidified tailings sample after...

Embodiment 2

[0029] A kind of iron tailings, wherein the particle content of >74 microns accounts for 14.20%, the content of particles of 37-74 microns accounts for 13.10%, and the content of particles of 2 70.70%, Al 2 o 3 3.17%, MgO 3.22%, CaO 6.04%, Fe 2 o 3 Accounted for 10.60%, other ingredients accounted for 6.27%. The tailings were tested according to HJ / T299-2007 method, the leaching amount of copper in untreated tailings was 86.7mg / L, zinc was 20.8mg / L, cadmium was 2mg / L, lead was 46.2mg / L, chromium was 10.19mg / L, arsenic 8.33mg / L. The mass concentration of the tailings before concentration is 25%. Add 45 grams of polyacrylamide and 45 grams of ferrous sulfate per ton of dry tailings, and settle for 6 hours to form tailings with a mass concentration of 50%. Add 200 kilograms of curing agent (wherein cement accounts for 80% and gypsum accounts for 20%) in each cubic tailings to mix and stir. After stirring, the unconfined compressive strength of the solidified tailings sample f...

Embodiment 3

[0031] A copper beneficiation tailings, in which the particle content of >74 microns accounts for 8.50%, the content of particles of 37-74 microns accounts for 9.10%, and the content of particles 2 Accounted for 63.94%, Al 2 o 3 Accounted for 15.78%, MgO accounted for v%, CaO accounted for 2.22%, Fe 2 o 3 Accounted for 3.74%, other ingredients accounted for 12.35%. The tailings were tested according to the HJ / T299-2007 method. The leached amount of copper in untreated tailings was 325.1mg / L, zinc was 35.1mg / L, cadmium was 2.4mg / L, lead was 53.8mg / L, chromium 35.7mg / L and 1.9mg / L arsenic. The mass concentration of tailings before concentration is 31%. Add 30 grams of polyacrylamide, 20 grams of polyferric chloride and 20 grams of polyferric chloride per ton of dry tailings, and settle for 6 hours to form tailings with a mass concentration of 65%. Add 120 kilograms of solidifying agent (wherein cement accounts for 25%, lime accounts for 10%, fly ash accounts for 50%, gypsum ...

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Abstract

The invention relates to a method for solidifying and dry-stacking mill tailings without a tailing reservoir, comprising the following steps of: firstly, concentration of tailings: introducing the mill tailings into a concentration basin and adding a coagulant to concentrate the tailings to the state of the mass concentration greater than 50%; secondly, solidification of the tailings: guiding the concentrated tailings into a solidifying stirrer, mixing with a solidifying agent and stirring; thirdly, primary curing of the solidified tailings: stacking the solidified tailings for 24 hours to carrying out primary curing; and fourthly, dry stacking of the solidified tailings: filling the primarily cured solidified tailings in a stacking field by using a layered and subdivided filling method, and compacting after each-layer filling. The method has the advantages that the liquid tailings are solidified into solidified bodies having certain strength and meeting the requirement of environmental quality and can be directly stacked in the stacking field without establishing the tailing reservoir, thereby thoroughly eliminating the wet stacking stability and environmental pollution risks of the tailings in the tailing reservoir, saving the land occupied area of the stacking field and having remarkable economic, social and environmental benefits.

Description

technical field [0001] The invention relates to a dry storage method for mineral processing tailings solidification treatment without a tailings pond, which is suitable for the safe disposal of mineral processing tailings with high water content, high fineness, and heavy metals and other pollutants, and belongs to mines and environmental engineering technology. Background technique [0002] As a by-product of mine beneficiation, tailings are a kind of solid waste with high moisture content that has no strength, contains pollutants, and is easy to liquefy and flow. At present, a large number of tailings in my country are mainly placed in tailings ponds. There is a great risk of dam failure under the earthquake, and the pollutants in the tailings pond also have great environmental safety hazards to the surface water, groundwater and soil around the pond. According to the statistics of the State Administration of Work Safety at the end of 2008, by the end of 2008, there were a ...

Claims

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Application Information

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IPC IPC(8): B09B1/00
Inventor 汪顺才张春雷靳伟陈颖
Owner HOHAI UNIV
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