Recycling of zinc oxide dust using ChCl-urea deep eutectic solvent with nitrilotriacetic acid as complexing agents

Wang, Shuxian; Xu, Cunying; Lei, Zhijun; Li, Jianru; Lu, Jingling; Xiang, Qinqin; Chen, Xiao; Ye, Hua

doi:10.1016/j.mineng.2021.107295

Cited by 18 publications

(4 citation statements)

References 39 publications

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“…Reduction time affects not only the reduction rate of Zn in carbon-containing pellets but also the smelting efficiency and energy consumption [ 12 , 15 , 23 , 24 , 25 , 26 , 27 ]. The relation of the ZnO reduction rate of zinc ash pellets and the different reduction times (30 min, 40 min, 50 min, and 60 min) are investigated, as shown in Figure 7 .…”

Section: Resultsmentioning

confidence: 99%

A New Process of Direct Zinc Oxide Production by Carbothermal Reduction of Zinc Ash

Gao

Wang

et al. 2022

Materials

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Zinc ash is a by-product of the hot-dip galvanizing process and the electrolytic zinc process, which is classified as a hazardous waste consisting predominately of zinc oxide that could be recovered as the useful main resource for ZnO preparation. In this work, in order to reduce the energy consumption of the direct reduction process and improve the resource-recovery rate. A new technology for zinc oxide production, by a carbothermal reduction of zinc ash, is proposed. This process includes two steps: high-temperature roasting of zinc ash for dechlorination and a carbothermal reduction of dechlorination ash. Zn in zinc ash is mainly presented in the form of zinc oxide (ZnO), basic zinc chloride (Zn5(OH)8Cl2H2O), and metallic zinc (Zn). Basic zinc chloride can be roasted and decomposed to reduce the chlorine content in zinc ash. The results of a chloride ion removal test show that the optimal roasting temperature is 1000 °C, with a holding time of 60 min. Under the modified conditions, the chloride content in the roasted zinc ash is reduced to 0.021 wt.%, and the dechlorination rate is more than 99.5%, which can meet the requirements of zinc oxide production. The best process conditions for zinc oxide production by carbothermic reduction are as follows: reduction temperature of 1250 °C, reduction time of 60 min, and reduction agent addition of 22 wt.%. Under the best reduction process, the purity of zinc oxide product is 99.5%, and the recovery of zinc is more than 99.25%. Needle-like zinc oxide obtained by carbothermic reduction has high purity and can replace zinc oxide produced by an indirect process.

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Section: Resultsmentioning

confidence: 99%

A New Process of Direct Zinc Oxide Production by Carbothermal Reduction of Zinc Ash

Gao

Wang

et al. 2022

Materials

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“…Based on this effect, nitrilotriacetic acid (NTA) was chosen as a depressant to separate fluorite from calcite. NTA is commonly used as a polyurethane foaming catalyst, complexing agent for extracting rare metals, stabilizer for polystyrene production, descaling agent, water treatment agent, phosphate-free detergent, cyanide-free electroplating agent, color developer, etc. ,, It contains three carboxyl groups, which not only can cause steric effects but also have strong hydrophilia.…”

Section: Introductionmentioning

confidence: 99%

Flotation Separation of Fluorite from Calcite using an Efficient Depressant Nitrilotriacetic Acid in the NaOL System

Xie,

Zhao,

Wang

et al. 2024

Langmuir

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Fluorite and calcite were separated with nitrilotriacetic acid (NTA) as a depressant. The single mineral flotation experiment confirmed that with 40 mg/L NaOL and 80 mg/L NTA, the fluorite recovery and calcite recovery were 24.37 and 94.13%, respectively, at pH 9. Meanwhile, in the fluorite-calcite binary mixed ore flotation experiment, the calcite recovery and fluorite recovery were 75.50 and 26.84%, respectively, and the CaCO 3 and CaF 2 grade in concentrate was 74.32 and 25.61%, respectively. The results confirmed that NTA could be used as a depressant to selectively inhibit fluorite flotation. The mechanism study illustrated that NTA was selectively reacted with fluorite by chemical interaction between O of NTA and Ca of fluorite. The adsorption of NTA on fluorite will impede the interaction between fluorite and NaOL. NTA could adsorb on fluorite in three ways, while the dominant two ways were the complex between double O of NTA and Ca of fluorite in a vertical model and the complex between double O of NTA and Ca of fluorite in a horizontal model.

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“…In this work, response surface methodology (RSM) [ 32 , 33 , 34 ] was introduced into the process optimisation of recovering Zn from Zn-containing MSD materials by coordination leaching using NH 3 -CH 3 COONH 4 -H 2 O solution. The influences of liquid/solid ratio, stirring speed, leaching time, total ammonia concentration, and the interactions between them on the Zn effective extraction rate were explored using the central composite design (CCD) of RSM, and a mathematic model of the factors affecting the Zn effective extraction rate was established.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Zinc from Metallurgical Slag and Dust by Ammonium Acetate Using Response Surface Methodology

Zheng

et al. 2023

Materials

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Metallurgical slag and dust (MSD) are abundant Zn-containing secondary resources that can partially alleviate the shortage of zinc minerals, with hazardous characteristics and a high recycling value. In this work, the process conditions of recycling Zn from MSD materials leaching by ammonium acetate (NH3-CH3COONH4-H2O) were optimised using response surface methodology (RSM). The influences of liquid/solid ratio, stirring speed, leaching time, total ammonia concentration, and the interactions between these variables on the Zn effective extraction rate during the ammonium acetate leaching process were investigated. Additionally, the predicted regression equation between the Zn effective extraction rate and the four affecting factors was established, and the optimal process parameters were determined with a stirring speed of 345 r/min, leaching temperature of 25 °C, [NH3]/[NH4]+ of 1:1, total ammonia concentration of 4.8 mol/L, liquid/solid ratio of 4.3:1, and leaching time of 46 min. The Zn effective extraction rates predicted by the proposed model and the measured values were 85.25% and 84.67%, respectively, with a relative error of 0.58% between the two values, indicating the accuracy and reliability of the proposed model. XRD and SEM-EDS analysis results showed that Zn2SiO4, ZnS, and ZnFe2O4 were among the main factors affecting the low extraction rate of zinc from metallurgical slag dust. This work established a new technology prototype for the effective and clean extraction of zinc resources, which can provide new routes to effectively utilise Zn-containing MSD materials and lay a foundation for developing other novel techniques for recycling Zn from Zn-containing secondary resources.

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Recycling of zinc oxide dust using ChCl-urea deep eutectic solvent with nitrilotriacetic acid as complexing agents

Cited by 18 publications

References 39 publications

A New Process of Direct Zinc Oxide Production by Carbothermal Reduction of Zinc Ash

A New Process of Direct Zinc Oxide Production by Carbothermal Reduction of Zinc Ash

Flotation Separation of Fluorite from Calcite using an Efficient Depressant Nitrilotriacetic Acid in the NaOL System

Recovery of Zinc from Metallurgical Slag and Dust by Ammonium Acetate Using Response Surface Methodology

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