Leaching characteristics and stability assessment of sequestered arsenic in flue dust based glass

Mahandra, Harshit; Wu, Chengqian; Ghahreman, Ahmad

doi:10.1016/j.chemosphere.2021.130173

Cited by 6 publications

(2 citation statements)

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“…The glass produced from waste has different applications in civil equipment (if their mechanical properties are qualified, they can be used in bricks or ceramics production), glass production, and hydraulic fracturing of oil wells [16]. Recently, GlassLock Process TM (Canada) as an environmentally-friendly method was developed by a Canadian company named Dundee Sustainable Technologies (DST), which showed promising immobilization of contaminants in acidic waste liquor, drainage, mineral concentrates (arsenopyrite, cobaltite, enargite, tennantite), and metallurgical flue dust, via its fusion into glass material using the vitrification process [32][33][34]. For As remediation of flue dust, silica, reused glass, and hematite have been mixed and vitrified the metallurgical waste into a 20% As-content glass [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, GlassLock Process TM (Canada) as an environmentally-friendly method was developed by a Canadian company named Dundee Sustainable Technologies (DST), which showed promising immobilization of contaminants in acidic waste liquor, drainage, mineral concentrates (arsenopyrite, cobaltite, enargite, tennantite), and metallurgical flue dust, via its fusion into glass material using the vitrification process [32][33][34]. For As remediation of flue dust, silica, reused glass, and hematite have been mixed and vitrified the metallurgical waste into a 20% As-content glass [32][33][34]. Different leaching methods for the stability assessment of waste into solids have been explored by various research groups [12,[35][36][37][38][39][40][41][42][43][44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study for Flue Dust Stabilization in Cement and Glass Materials: A Stability Assessment of Arsenic

2022

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Arsenic is a poisonous element and its super mobility can pose a major threat to the environment and human beings. Disposed arsenic-bearing waste or minerals over time may release arsenic into the groundwater, soil and then the food chain. Consequently, safe landfill deposition should be carried out to minimize arsenic bleeding. Cement-based stabilization/solidification and glass vitrification are two important methods for arsenic immobilization. This work compares the stability and intrinsic leaching properties of sequestered arsenic by cement encapsulation and glass vitrification of smelter high-arsenic flue dust (60% As2O3) and confirms if they meet or exceed the requirement of landfill disposition over a range of environmentally relevant conditions. The toxicity characterization leaching procedure (TCLP, 1311), synthetic precipitation leaching procedure (SPLP, 1312) and Australian standard (Aus. 4439.3) in short-term (18 h) and mass transfer from monolithic material using a semi-dynamic leaching tank (1315) in longer-term (165 days) were employed to assess arsenic immobility characteristic in three arsenic-cement (2%, 8.4% and 14.4%) and arsenic-glass (11.7%) samples. Moreover, calcium release from different matrices has been taken into consideration as a contributor to arsenic bleeding. Based on the USEPA guidelines, samples can be acceptable for landfilling only if As release is < 5 mg/L. Results obtained from short-term leaching were almost similar for both cement and glass materials. However, high calcium release was observed from the cement-encapsulated materials. The pH of leachates after the test was highly alkaline for encapsulated materials; however, in glass material it was near neutral or slightly acidic. Method 1315 tests made a huge difference between the two materials and confirmed that cement encapsulation is not the best method for landfilling arsenic waste due to the high arsenic and calcium release over time with alkaline pH. However, glass material has shown promising results, i.e., the insignificant release of arsenic over time with an acceptable change in pH value. Overall, arsenic sequestration in glass is a better option compared with the cement-based solidification process.

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Section: Introductionmentioning

confidence: 99%