Eco-friendly extraction of arsenic and tungsten from hazardous tungsten residue waste by pressure oxidation leaching in alkaline solutions: Mechanism and kinetic model

Wu, Xinsheng; Zeng, Li; Wu, Shengxi; Qing, Jialin; Li, Qinggang; Cao, Zuoying; Wang, Mingyu; Zhang, Guiqing; Guan, Wenjuan

doi:10.1016/j.jenvman.2022.116586

Cited by 12 publications

(2 citation statements)

References 29 publications

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“…Wu et al [95] proposed a new process to treat tungsten residue as described in Figure 10b. Firstly, tungsten residue was leached using 90 g/L NaOH at a stirring speed of 600 r/min, an oxygen pressure of 0.9 MPa, and 200 • C for 80 min.…”

Section: Harmless Treatment and Reductionmentioning

confidence: 99%

Recent Advances in the Utilization of Tungsten Residue: A Mini Review of China

Deng,

Cheng,

et al. 2023

Metals

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As a metal of strategic value, tungsten plays an important part in civil and military applications. Currently, China is the biggest tungsten producer all over the world, and the metallic smelting technologies for tungsten are well established. However, the harmless recovery and treatment procedures for tungsten residue remain rather underdeveloped. The treatment of tungsten residue generally includes the recovery of valuable metals (e.g., scandium, tantalum, and niobium) and the solidification of toxic elements (e.g., arsenic, lead, and chromium), which may control the transfer of these elements and metals. If treated improperly, the resource of tungsten residue may be wasted, and potential environmental risks could arise. Therefore, the safe disposition of tungsten residue has become the limit factor and an urgent problem to be solved for the sustainable development of tungsten-related industries. In this regard, we reviewed the industrial background of tungsten and the composition and toxicity characteristics of tungsten residue. In addition, particular attention was paid to the harmless utilization processes and technologies for tungsten residue, which were then systematically compared in terms of the applicable situations as well as their advantages and shortcomings. Finally, the development trend for the harmless utilization of tungsten residue was discussed, and some proposals for further studies were provided.

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Section: Harmless Treatment and Reductionmentioning

confidence: 99%

Recent Advances in the Utilization of Tungsten Residue: A Mini Review of China

Deng,

Cheng,

et al. 2023

Metals

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“…The use of autoclave processes for processing sulfide copper-arsenic raw materials will ensure high leaching intensity, selectivity, and completeness of extraction of valuable components into the solution [26][27][28][29][30][31][32][33][34][35][36]. High temperatures and pressure of the oxidizing agent (oxygen and air) in the autoclave, combined in some cases with the addition of oxidation catalysts or the ultrafine grinding of raw materials, make it possible to suppress the passivation of the chalcopyrite surface during leaching.…”

Section: Introductionmentioning

confidence: 99%

Purification of Copper Concentrate from Arsenic under Autoclave Conditions

Karimov,

Dizer,

Tretiak

et al. 2024

Metals

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This study presents the results of a two-stage autoclave processing of a copper–arsenic concentrate. Copper concentrate is an important raw material to produce copper and other metals. However, in some cases, the concentrate may contain increased amounts of arsenic, which makes further processing difficult. Therefore, the development of modern hydrometallurgical methods for processing copper concentrate with a high arsenic content is an urgent task, which could lead to the optimization of the raw material processing process and the improvement of the quality of the concentrate. It has been established that the optimal conditions for the sequential two-stage autoclave processing of copper–arsenic concentrate are: t = 220–225 °C, τoxidation = 20 min, τtot = 90 min, Po2 = 0.4 MPa, and L:S = 10:1, [H2SO4]initial = 40 g/dm3; in this case, 85% of zinc, 44% of iron, and 78% of arsenic, respectively, are extracted into the solution during both stages and the loss of copper was about 0.01%. This is explained by the fact that at the first stage (oxidation) of the autoclave processing of the copper–arsenic concentrate, copper, together with iron, leaches into the solution, and at the second stage (reduction), copper precipitates out of the solution in the form of chalcocite. Copper in the residue after autoclave leaching is in the form of Cu2S, iron is in the form of pyrite (FeS2), and lead is in the form of anglesite (PbSO4), respectively. The obtained micrographs and EDX mappings clearly show no iron arsenates. This confirms that at the oxidative stage of the developed process, arsenic, removed by 78%, remains in the solution. The remaining arsenic is associated with tennantite, indicating the effectiveness of the treatment process in removing arsenic from the copper–arsenic concentrate. A second important observation is the presence of pronounced areas of copper sulfides in the microphotos without iron and arsenic impurities. This confirms that copper is deposited as chalcocite during the reduction phase of the process, which is the desired result.

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Study on the characteristics of tungsten slag and its properties in the cement solidification system

Liu,

Ge,

et al. 2024

J Mater Cycles Waste Manag

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Eco-friendly extraction of arsenic and tungsten from hazardous tungsten residue waste by pressure oxidation leaching in alkaline solutions: Mechanism and kinetic model

Cited by 12 publications

References 29 publications

Recent Advances in the Utilization of Tungsten Residue: A Mini Review of China

Recent Advances in the Utilization of Tungsten Residue: A Mini Review of China

Purification of Copper Concentrate from Arsenic under Autoclave Conditions

Study on the characteristics of tungsten slag and its properties in the cement solidification system

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