Simulation of cyanide oxidation using calcium and sodium hypochlorite in the Moteh Gold Mine Tailing Dam, Iran

Tavasoli, Elham; Asadollahfardi, Gholamreza; Darban, Ahmad Khodadadi; Asadi, Mohsen

doi:10.5004/dwt.2019.23639

Cited by 2 publications

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“…According to the peak specific energy of cemented backfill under different cement-tailings ratios R in Table 1, the 3 Geofluids relationship between these factors was analyzed [42,43]. Figure 7 shows that the peak specific energy of the cemented backfill has an exponential relationship with the filling ratio, and the correlation coefficient R 2 can reach 0.995 [44,45]. The relationship can be written as…”

Section: Parameter Determinationmentioning

confidence: 99%

A New Decision Method of Filling Ratio Based on Energy Matching of Surrounding Rock and Backfill

Zhou

Lin

2020

Geofluids

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In order to simplify the ratio decision process of cemented backfill in underground mines and achieve fine decision of filling ratio, the research on the energy matching between surrounding rock and cemented backfill in underground mines was conducted in this study. Based on the cubic function strength model of cemented backfill, the peak specific energy equation of backfill was improved by inversion analysis of the data of filling ratio experiment, and the functional relationship between the peak specific energy and the filling ratio was obtained by regression analysis. Then, based on the energy balance principle between the deformation energy released by the excavation of the underground rock mass and the peak specific energy of the cemented backfill, considering the physical and mechanical parameters of the surrounding rock of the goaf, including bulk density, elastic modulus, and burial depth, a ratio decision model of cemented backfill is established. The application results suggested that the calculation result of the model is reliable, and it can realize the rapid and accurate decision of the ratio of cement backfill in underground mines.

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Section: Parameter Determinationmentioning

confidence: 99%

A New Decision Method of Filling Ratio Based on Energy Matching of Surrounding Rock and Backfill

Zhou

Lin

2020

Geofluids

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“…12 Calcium hypochlorite [Ca(ClO) 2 ] is an oxidant that is widely used in water and wastewater treatment for its excellent characteristics in both efficiency and cost. 13,14 Recently, applying Ca(ClO) 2 in WAS treatment has drawn increasing attention of researchers around the world. 15,16 Compared with other frequently used oxidants such as H 2 O 2 , KMnO 4 , CaO 2 , and O 3 , Ca(ClO) 2 has advantages in both stability and price.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Among them, the chemical oxidization method has advantages in the aspects of efficiency, investment cost, and operation and thus has become one of the research focus points in recent years . Calcium hypochlorite [Ca(ClO) 2 ] is an oxidant that is widely used in water and wastewater treatment for its excellent characteristics in both efficiency and cost. , Recently, applying Ca(ClO) 2 in WAS treatment has drawn increasing attention of researchers around the world. , Compared with other frequently used oxidants such as H 2 O 2 , KMnO 4 , CaO 2 , and O 3 , Ca(ClO) 2 has advantages in both stability and price. In the treatment process, Ca(ClO) 2 can efficiently break the EPS flocs and microbial cytoderm/cytomembrane, which then results in the release of both extracellular and intracellular organics.…”

Section: Introductionmentioning

confidence: 99%

Calcium Hypochlorite Promotes Dark Fermentative Hydrogen Production from Waste Activated Sludge

Tao

2022

ACS Sustainable Chem. Eng.

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This study reported a high-efficiency and low-cost sludge pretreatment method using calcium hypochlorite [Ca(ClO)2] for promoting anaerobic fermentation performance. The experimental results indicated that the cumulative hydrogen yield was enhanced from 1.87 to 16.72 mL/g volatile suspended solids (VSSs) when the Ca(ClO)2 dosage was increased from 0 to 1.5 g/L and then reduced to 13.80 mL/g VSSs when the Ca(ClO)2 dosage reached 1.8 g/L. The mechanism study revealed that Ca(ClO)2 efficiently disrupted sludge extracellular polymeric substances and microbial cells, producing more soluble organics for the subsequent biochemical processes. Beyond that, the biodegradability of sludge organics was promoted by Ca(ClO)2 pretreatment. Biochemical reaction kinetic analysis indicated that the activities of microbes responsible for hydrogen consumption were severely inhibited when treated with Ca(ClO)2. The two decomposition products of Ca(ClO)2, Ca(OH)2 and HClO, positively affected the hydrogen yield, with the contribution of Ca(OH)2 being greater than HClO. Microbial community analysis illustrated that the fermentative microbes were markedly enriched by Ca(ClO)2 pretreatment, with the abundances found to be 3.21 and 45.62% in control and Ca(ClO)2-pretreated fermenters, respectively. After fermentation, the Ca(ClO)2-pretreated sludge showed better dewaterability than the control, and the organic pollutants diclofenac and sulfamethazine, as well as the fecal coliforms, were largely removed by Ca(ClO)2.

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Simulation of cyanide oxidation using calcium and sodium hypochlorite in the Moteh Gold Mine Tailing Dam, Iran

Cited by 2 publications

References 0 publications

A New Decision Method of Filling Ratio Based on Energy Matching of Surrounding Rock and Backfill

A New Decision Method of Filling Ratio Based on Energy Matching of Surrounding Rock and Backfill

Calcium Hypochlorite Promotes Dark Fermentative Hydrogen Production from Waste Activated Sludge

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