Separation and recovery of ZnS from sulfidized neutralization sludge via the hydration conversion of CaSO4 into bulk CaSO4·2H2O crystals

Chai, Liyuan; Ke, Yanxiong; Min, Xin; Zhou, Boting; Xue, Ke; Chen, Jie

doi:10.1016/j.seppur.2015.09.029

Cited by 23 publications

(5 citation statements)

References 30 publications

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“…The binding energy of the As 3d 5/2 peak is fitted with three As components consisting of As(III) and As(II). The reported peaks of As 3d 5/2 at 43.1, 43.4 and 44.8 eV were attributed to As(II)-S, As(III)-S and As(III)-O, respectively [ 4 , 27 , 48 , 51 ]. As shown in Table 6 , before the treatment, the content of As(III)-S (72%) predominated the As speciation, followed by As(III)-O (28%).…”

Section: Resultsmentioning

confidence: 99%

“…Qiu et al [ 26 ] indicated that hydrothermal treatment assisted by microwave heating is a feasible approach for the solidification of heavy metals in fly ash. Our previous studies [ 27 , 28 , 29 , 30 ] determined that stabilization of heavy-metal-containing neutralization sludge and dehydration of calcium sulfate dihydrate and calcium sulfate hemihydrate in the neutralization sludge occurred during hydrothermal treatment.…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal Treatment of Arsenic Sulfide Residues from Arsenic-Bearing Acid Wastewater

Yao

Min

et al. 2018

IJERPH

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Arsenic sulfide residue (ASR), a by-product from the treatment of arsenic-bearing acidic wastewater, is abundantly generated but not properly disposed of in China. The utilization of such high-content arsenic waste residue is limited by the market. The traditional methods of stabilization/solidification (S/S) by lime cement or iron salt have a large mass/volume addition, high dumping cost and secondary pollution risk. In this paper, hydrothermal technology was used to treat three kinds of ASRs obtained from different smelters to minimize waste. The leaching toxicity and chemical speciation of the generated products was also evaluated by TCLP and BCR analyses. It was found that the hydrothermal treatment could greatly reduce the volume and moisture content of the ASRs. TCLP tests showed that the leachability of arsenic and heavy metals significantly decreased after the treatment. According to the BCR analysis, most of the unstable As, Cd and Cr transformed into a residual fraction. Finally, XRD, SEM, Raman and XPS techniques were carried out to reveal the mechanism. As a result, hydrothermal treatment can efficiently achieve the dehydration, volume reduction and stabilization/solidification of ASRs.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrothermal Treatment of Arsenic Sulfide Residues from Arsenic-Bearing Acid Wastewater

Yao

Min

et al. 2018

IJERPH

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“…The possibility of the zinc sulfide carbothermal reduction by limestone with the calcium sulfide (CaS) formation was shown in [18]. In [19], it was shown that when some chemical production wastes are neutralized, ZnS and gypsum dihydrate are formed in sludge. Such sludges are found in synthetic fibers production enterprises.…”

Section: Methodsmentioning

confidence: 99%

Features of Zinc Extraction from Sulfide Forms

Sheshukov

Mikheenkov

Egiazar’yan

2020

MSF

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Zinc can be found in oxide and sulfide forms in technogenic formations. Zinc oxide extraction from technogenic formations is widely used in industry. Removing zinc sulfide from technogenic formations is difficult and is currently almost never used. In the present work, the physicochemical features of zinc extraction from sulfide are considered. Process thermodynamic features and possible ways to extract zinc sulfide are shown. Also, ways of valuable commercial products, obtaining from the roasting products, are considered.

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“…The possibility of the carbothermal reduction of zinc sulfide by limestone with the formation of calcium sulfide CaS was shown in [18]. In [19], it was shown that when some chemical production wastes are neutralized, zinc in sulphide form (ZnS) and gypsum dihydrate are formed in sludge. Such sludges are found in enterprises for the production of synthetic fibers.…”

Section: Methodsmentioning

confidence: 99%

Zinc Techno-Genic Formations: Physico-Chemical Features of its Extraction

Sheshukov

Mikheenkov

Лобанов

2020

SSP

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In technogenic formations, zinc is found in oxide and sulphide forms. Extraction of zinc oxide from technogenic formations is widely used in industry. Removing zinc sulfide from technogenic formations is difficult and is currently almost never used. In the present work, the physicochemical features of zinc extraction from technogenic formations, in which zinc is presented in oxide and sulphide forms, are considered. Thermodynamic features of the processes and possible ways to extract zinc sulphide are shown. This work also considers the ways of valuable commercial products obtaining from the roasting products.

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Separation and recovery of ZnS from sulfidized neutralization sludge via the hydration conversion of CaSO4 into bulk CaSO4·2H2O crystals

Cited by 23 publications

References 30 publications

Hydrothermal Treatment of Arsenic Sulfide Residues from Arsenic-Bearing Acid Wastewater

Hydrothermal Treatment of Arsenic Sulfide Residues from Arsenic-Bearing Acid Wastewater

Features of Zinc Extraction from Sulfide Forms

Zinc Techno-Genic Formations: Physico-Chemical Features of its Extraction

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