Acid mine drainage as a coagulant

Rao, S. Ramachandra; Gehr, Ronald; Riendeau, M.; Lu, Daichan; Finch, J.A.

doi:10.1016/0892-6875(92)90128-v

Cited by 30 publications

(20 citation statements)

References 1 publication

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“…AMD sludge has been previously considered for the production of coagulants (Rao et al 1992), ferric oxide nanoparticles (Wei and Viadero 2007), and inorganic pigments (Hedin 2002;Marcello et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Production of a Poly-ferric Sulphate Chemical Coagulant by Selective Precipitation of Iron from Acidic Coal Mine Drainage

et al. 2009

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The aim of this work was to produce a ferric sulphate rich solution from acidic coal mine drainage that could be used as coagulant. Precipitating the iron at pH 3.8, followed by dissolution in sulphuric acid, produced a coagulant consisting of 12.4% iron and 1.3% aluminium. Water treatment tests proved that this coagulant was as efficient as the coagulant chemicals conventionally used in water treatment plants. The process can be easily incorporated into conventional AMD treatment plants, thereby reducing sludge waste issues and producing a valuable chemical reagent.

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Section: Introductionmentioning

confidence: 99%

“…In the work conducted by Rao et al (1992) on an AMD from a Canadian polymetallic mine, ferric sulphate (FS) was produced by the reaction of ferric hydroxide recovered from the AMD with sulphuric acid. To avoid the co-precipitation of undesirable metals, amine was used to reduce the co-precipitation at pH 3.5-3.6.…”

Section: Introductionmentioning

confidence: 99%

Production of a Poly-ferric Sulphate Chemical Coagulant by Selective Precipitation of Iron from Acidic Coal Mine Drainage

et al. 2009

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Section: Introductionmentioning

confidence: 99%

“…Zn and Ni, generally using the techniques of selective precipitation, precipitation and dissolution, solvent extraction, electrowinning and ion exchange. Iron is the most abundant metal in mine drainage and various recovery options were tested, such as the direct use of the ochre deposits as brick component [1] , as pigment [2] or as reactive substrate for trace elements and nutrient removal [3], [4] , or the conversion of ochre and mine water treatment sludges by acid dissolution for use as coagulants [5] .The options for copper recovery include direct electrowinning, using copper reduction on iron metal and copper precipitation using biogenic produced hydrogen sulphide such as in the Paques or BioteQ systems [6] (technique that works well for Zn 2+ also).Aluminium may be present in mine water in concentration from near zero to more than 4 g/L [8] , but researchers rarely show interest for the recovery of this element, because of the high cost needed to use the impure recovered product for metallurgy. However, alternatives for aluminium valorisation were observed.…”

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confidence: 99%

Towards Mining the Mine Water - Recovery of Aluminium and Manganese

Dinu¹,

Balaiu²,

Cristea³

et al. 2016

Simi 2016

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Mine water or rock drainage is a source of pollution for Romanian as well as for mining sites all around the world. Rock drainage is generated as a result of the weathering of the sulphidic minerals from which metal ions are leached. The metal ions are the main polluting species existing in the mine water, but may also be seen as a resource that is wasted. However, the recovery is seldom applied, as it is not feasible due to complex chemical matrix. Some types of mine water are more appropriate for the resource recovery, the best known case being copper reach streams. Here we show some attractive results suggesting that the recovery of aluminium, but also of manganese would be feasible practices for particular mine water categories and for distinct utilizations: mine water treatment and high purity resource for metallurgy, respectively. Keywords: aluminium, manganese, mine water, recovery IntroductionMine water from abandoned mines has a harmful impact on the ecological status of receiving water bodies. The metal ions in the mine water are the main deleterious species, but may represent a recoverable resource. Beside the availability of (still) cheap ore resources, mine waters vary considerably in the range and concentration of heavy metals they contain and these issues can lead to the failure of the recovery of potentially valuable metals. Studies are focussed mainly on the recovery of Fe, Cu. Zn and Ni, generally using the techniques of selective precipitation, precipitation and dissolution, solvent extraction, electrowinning and ion exchange. Iron is the most abundant metal in mine drainage and various recovery options were tested, such as the direct use of the ochre deposits as brick component [1] , as pigment [2] or as reactive substrate for trace elements and nutrient removal [3], [4] , or the conversion of ochre and mine water treatment sludges by acid dissolution for use as coagulants [5] .The options for copper recovery include direct electrowinning, using copper reduction on iron metal and copper precipitation using biogenic produced hydrogen sulphide such as in the Paques or BioteQ systems [6] (technique that works well for Zn 2+ also).Aluminium may be present in mine water in concentration from near zero to more than 4 g/L [8] , but researchers rarely show interest for the recovery of this element, because of the high cost needed to use the impure recovered product for metallurgy. However, alternatives for aluminium valorisation were observed. For example, a poly-alumino-iron sulphate coagulant useful for the

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“…could then be used as a source of ferric chloride and alum, which could then be used in municipal wastewater treatment. Untreated AMD has been used successfully as a coagulating agent in laboratory experiments (Rao et al 1992).…”

Section: Introductionmentioning

confidence: 99%

New Functional Polymers as Sorbents for the Selective Recovery of Toxic Heavy Metals from Acid Mine Drainage

Hubbard¹,

Darling²,

Rao³

et al. 1994

ASMR

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By a new synthetic technique, macroporous crosslinked polystyrene resin was functionalized with ligands containing sulfur, nitrogen, and/or oxygen atoms. Preliminary studies indicate that when added to a synthetic acid mine drainage (AMD) solution, some of these functional polymers were capable of selectively binding zinc without becoming "fouled" by iron. Elution of the loaded resins with acid to recover the zinc was also possible. The greatest selectivity for zinc was obtained with functional groups that contained only electronically "soft" nucleophilic centers such as sulfur and nitrogen, and not oxygen atoms, which are electronically "hard" (and prefer such "hard" electrophiles as magnesium, aluminum, or iron cations). The perfo1mance of some of these new materials exceeded that of the commercial ion-exchange resins tested with respect to capacity and selectivity.

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Acid mine drainage as a coagulant

Cited by 30 publications

References 1 publication

Production of a Poly-ferric Sulphate Chemical Coagulant by Selective Precipitation of Iron from Acidic Coal Mine Drainage

Production of a Poly-ferric Sulphate Chemical Coagulant by Selective Precipitation of Iron from Acidic Coal Mine Drainage

Towards Mining the Mine Water - Recovery of Aluminium and Manganese

New Functional Polymers as Sorbents for the Selective Recovery of Toxic Heavy Metals from Acid Mine Drainage

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