Mitigation negative effects of thiosulfate on flotation performance of a Cu-Pb-Zn sulfide ore

Öztürk, Yasemin; Bıçak, Özlem; Özdemir, Elif; Ekmekçi, Zafir

doi:10.1016/j.mineng.2018.03.034

Cited by 27 publications

(18 citation statements)

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“…Thiosalts, which are also known as polythionates, are sulfur oxyion compounds, and the general structure is S n O m 2− [34]. Among them, researchers mostly focus on thiosulfate, tetrathionate, and trithionate [27,34,40,42]. Only thiosulfate and tetrathionate are found in the market, and trithionate could be synthesized with 96-100% purity [40].…”

Section: Importance Applicability Limits and Uncertainty Of The DImentioning

confidence: 99%

Dissolution Test Protocol for Estimating Water Quality Changes in Minerals Processing Plants Operating With Closed Water Circulation

Schreithofer

Dahl

2020

Minerals

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To save freshwater resources and comply with environmental regulations, minerals processing operations are transitioning to partially or fully closed water circulation. However, the accumulation of electrolytes and the addition of reagents lead to changes in water composition and may compromise flotation performance and plant maintenance. As a consequence, costly modifications are often required to cope with these challenges. Therefore, knowledge about water quality variation owing to closed water circulation and its potential effect on the flotation performance is crucial. The experimental methodology presented in this paper targeted three main objectives: (1) predicting the tendency of the accumulation of elements and compounds into the process water during comminution, flotation, and storage in tailings facilities; (2) establishing a relationship between laboratory results and plant historical water quality data; and (3) predicting the potential effect of recycling water on flotation performance. The results obtained with Boliden Kevitsa ore showed a good correlation between the water matrix of the actual process water on-site and that obtained in the ore dissolution tests done in the laboratory. The final water composition came close to the process water in terms of major elements and some of the minor elements. Additionally, the work presented in this paper demonstrated that a dissolution loop allowed us to predict the potential impact of the recycling water on the ore flotability. This methodology could serve as an aid for predicting water quality matrix variation and designing closed water circulation systems at existing and new plants.

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Section: Importance Applicability Limits and Uncertainty Of The DImentioning

confidence: 99%

Dissolution Test Protocol for Estimating Water Quality Changes in Minerals Processing Plants Operating With Closed Water Circulation

Schreithofer

Dahl

2020

Minerals

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“…The purpose of water treatment by ion exchange resins was partial cleaning of process water and reducing the concentration of harmful ions for the flotation process to acceptable levels. This concentration was determined as <1000-1500 ppm for sulfate according to laboratory scale flotation tests and plant performance data [4]. Figure 4 shows that the target ion concentration can be achieved in 45-50 min, which means 3.38 L of process water can be treated with 310 g resin (11 L water per 1 kg resin), and adsorption capacity of the resin for this particular example was calculated as 80.3 mg SO 4 /g of resin.…”

Section: Laboratory Scale Studiesmentioning

confidence: 99%

“…Particularly in flotation of sulphide minerals, oxidation and dissolution of ore may change the pulp chemistry significantly due to the dissolved metal and sulphide ions. Bıçak et al [3] and Öztürk et al [4] reported that these ions can be found in the pulp, mostly in the form of sulphate and thiosulphate, which both have noteworthy implications on froth stability and surface chemistry of the minerals. Thiosalts are known as the products of oxidation of sulphide minerals and occur as sulfoxyl anions like thiosulfate (S 2 O 3 2− ), polythionates (Sn(SO 3 ) 2 ) and sulfite (SO 3 2− ).…”

Section: Introductionmentioning

confidence: 99%

“…They may be oxidized by oxygen and generate proton acidity, resulting in a decrease in pH and an increase in dissolution of minerals [5][6][7]. High concentrations of thiosalts may slow down the sulphidization process of an oxidized Cu-Co ore in case of reusing the process water [8] and have depression effect on sulphide minerals in a Cu-Pb-Zn ore [4]. It is reported that thiosalts and dissolved metal ions also influenced the froth stability.…”

Section: Introductionmentioning

confidence: 99%

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Sulphate Removal from Flotation Process Water Using Ion-Exchange Resin Column System

et al. 2020

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Water chemistry is one of the most important parameters affecting flotation performance. Various types of ions can dissolve and accumulate in process water depending on ore mineralogy, reagent scheme, grinding medium and chemistry of mine site water. Sulfur-based ions (sulfate, thiosulfate, polythionate) are generally observed in flotation of sulfide ores. High concentrations of these ions may reduce efficiency of the flotation process, causing scale problems. Removal of these ions from process water often requires complex water treatment plants with high capital and operating costs. In this study, partial cleaning of water was investigated as an alternative approach for decreasing high sulphate concentrations of 3000–3800 mg/L down to 1000–1500 mg/L, an acceptable concentration for most sulfide ore flotation plants, by using an ion-exchange resin. For this purpose, detailed adsorption tests were performed using a laboratory-scale column system to determine the most suitable type of resin for adsorption of sulfate and thiosalts, kinetics of adsorption and regeneration of the resins. A strong base anion ion exchange resin (Selion SBA2000) was used in the experiments. The findings from the laboratory scale studies were validated in a Cu-Pb-Zn Flotation Plant in an Iberian mine using a larger scale of column set-up. The results showed that 60–70% of sulphates could be successfully removed from process water. Adsorption capacity of the resin was determined as 80.3 mg SO4/g resin. Concentrations of thiosalts and polythionates were also reduced to nearly zero value from 500 mg/L and 1000 mg/L, respectively. Flowrate of water had a significant effect on adsorption performance. The resin could be regenerated successfully using 2% (w/v) NaOH solution and used multiple times for water treatment.

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“…It can be concluded that the agents mentioned in the above studies have a strong ability to collect marmatite rather than jamesonite. Usually, in the flotation process of polymetallic sulfide ore, lead sulfide ore and zinc sulfide ore are separated in sequence (Öztürk et al, 2018;Chen et al, 2019), which means that the above-mentioned collectors cannot be applied industrially. Hence, it is urgent to find a collector with good collecting ability and strong selectivity for jamesonite to be suitable for the industrial separation process of jamesonite and marmatite.…”

Section: Introductionmentioning

confidence: 99%

Effect of compound phosphate collector on flotation separation of jamesonite from marmatite and insights into adsorption mechanism

Huang¹,

Gu²,

Xiong³

et al. 2020

Physicochem. Probl. Miner. Process.

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Mitigation negative effects of thiosulfate on flotation performance of a Cu-Pb-Zn sulfide ore

Cited by 27 publications

References 10 publications

Dissolution Test Protocol for Estimating Water Quality Changes in Minerals Processing Plants Operating With Closed Water Circulation

Dissolution Test Protocol for Estimating Water Quality Changes in Minerals Processing Plants Operating With Closed Water Circulation

Sulphate Removal from Flotation Process Water Using Ion-Exchange Resin Column System

Effect of compound phosphate collector on flotation separation of jamesonite from marmatite and insights into adsorption mechanism

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