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Stabilization of hazardous materials

A hazardous, aluminum hydroxide-based technology for arsenic waste stabilization/solidification that can solve problems such as not being a long-term effective option

Active Publication Date: 2020-03-31
MCGILL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, cement-based stabilization / curing is not a long-term effective option for iron arsenate-type solids like scorodite because the process creates a highly alkaline environment (pH around 12.5) that leads to arsenic release

Method used

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  • Stabilization of hazardous materials
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  • Stabilization of hazardous materials

Examples

Experimental program
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preparation example Construction

[0037] Preparation of scorodite

[0038] The scorodite base material was synthesized by atmospheric precipitation by using the seeding and supersaturation control method previously developed by the inventors. In this procedure, 0.5 L of As(V)-Fe(III)-H 2 SO 4 The solution was placed in a reactor and heated to 95°C. When the temperature inside the reactor reached about 65°C and the pH dropped to 0.45, 5 g of hydrothermally generated scorodite was seeded into the reactor. In the presence of seeds, precipitation was initiated and proceeded for 24 hours after which time the slurry was filtered using a pressure filter with a 0.22 μm pore size membrane filter. The solids were then subjected to several washes and successive TCLP type wash steps (TCLP stands for Toxic Characteristic Leachability Program method developed by the US Environmental Protection Agency (EPA)). The freshly washed scorodite particles are then used for aging with aluminum hydroxide gel. All reagents and che...

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Abstract

The invention relates to stabilization and / or solidification of hazardous materials which might be generated by activities like mining, milling or smelting industrial operations, such as arsenical wastes (such as scorodite, arsenic sulfides, calcium arsenates or arsenites, mixed calcium arsenates-phosphates, ferrous arsenate, ferric arsenite, or arsenic trioxide), antimony, mercury or selenium-containing wastes through the encapsulation of the arsenical wastes in the mineralized products of hydrolyzed aluminum gels created through the partial neutralization of A1(SO4)1.5 by a carbonate.

Description

technical field [0001] The present invention relates to the stabilization / immobilization of hazardous materials, especially arsenic waste, by encapsulation using mineralization products of hydrolyzed aluminum gels. Background technique [0002] Hazardous materials generated by different industries require handling and control in waste management facilities to ensure that no toxic elements are released into the environment. Arsenic is a major environmental hazard in many mining, milling or smelting operations requiring proper fixation and disposal. One of the preferred treatment methods for addressing the arsenic problem in the mineral / metal industry is to co-precipitate it as iron arsenate solids by neutralizing it with lime. While this approach is applicable to dilute arsenic sources, it is not applicable to rich arsenic sources. In the latter case scorodite (FeAsO 4 2H 2 O) Form immobilization of arsenic (which is released during pyrometallurgical or hydrometallurgical...

Claims

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Application Information

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IPC IPC(8): A62D3/33
CPCB09C1/08B09B3/25B09B3/20
Inventor G·德莫普洛斯
Owner MCGILL UNIV
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