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Kinetics of copper leaching from direct‑to‑blister copper flash smelting slag by sulfuric acid

Gargul Krzysztof, Boryczko Bożena, Handzlik Piotr, Noga Piotr, Palimąka Piotr

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 1

art. no. e29, 2023

EN

Coppermaking from sulfide concentrates entails two major steps: smelting and converting. In continuous direct-to-copper smelting process these two steps are combined into one. The principal advantages of this process are: isolation of SO2 emission to a single, continuous, SO2-rich gas stream, minimization of energy consumption and minimization of capital and operating costs. Disadvantages of the process are that about 25% of the Cu entering a direct-to-copper smelting furnace ends up dissolved in the slag (when compared with < 10% in traditional Peirce-Smith converting) and the cost of recovering this Cu is significant. Decopperization process is based on the reduction of cuprous oxide and other metals, mainly lead and iron, in the liquid state in an electric furnace in the presence of coke and technological additives. This paper presents the results of laboratory tests on flash smelting slag leaching with sulfuric acid solutions. Hydrometallurgical treatment of the slag could be an alternative route to the presently used way of processing. The influence of a number of leaching parameters such as sulfuric acid concentration, amount of H2O2 added, liquid to solid phase (l/s) parameter and process temperature on the copper leaching efficiency was investigated. Under optimized process conditions, 95.6% of the copper contained in the original sample of slag was transferred into a solution. The experimental results obtained in the study were supplemented with the analysis of the kinetics of the copper leaching process from the flash smelting slag. The commonly known from the literature diffusion model and chemical reaction model were used. The activation energy of copper leaching from flash smelting slag was estimated in the range from 12.77 to 17.34 kJ/mol.

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Badanie odzysku metali ziem rzadkich z popiołów lotnych przy zastosowaniu wielostopniowego ługowania kwasem siarkowym(VI)

Świnder H., Białecka B., Jarosiński A.

Przemysł Chemiczny

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2017

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T. 96, nr 11

2238--2242

PL

Dokonano oceny możliwości ługowania metali ziem rzadkich z popiołów lotnych pochodzących ze spalania węgla kamiennego w jednej z krajowych elektrowni. Do scharakteryzowania właściwości fizykochemicznych badanego materiału wykorzystano wyniki analizy chemicznej oraz skaningowej analizy mikroskopowej wraz z analizą EDS i analizą rentgenograficzną. Wielostopniowe ługowanie roztworami kwasu siarkowego(VI) prowadzono w temp. 70°C. Początkowe stężenie kwasu siarkowego(VI) wynosiło 6,5% mas. H₂SO₄. Stwierdzono, że stopień wyługowania metali ziem rzadkich zmniejszał się w kolejnych etapach ługowania. Przykładowo stopień wyługowania dla ceru zmieniał się z 23% w pierwszym etapie ługowania do 12% w szóstym etapie. Zastosowanie 6-krotnego ługowania pozwoliło na zwiększenie stężenia ceru, lantanu, neodymu, skandu i itru w końcowym roztworze ługującym ok. 3-krotnie, do 80,97% zawartości REE w próbce popiołu wyjściowego.

EN

Fly ash from coal combustion was leached in 6 steps with 3,5-9,5% H₂SO₄ at 70°C and phase ratio 100:1 to recover Ce, La, Nd, Sc and Y. The leaching degree was 80,97% after 6 steps of leaching. The final concns. of the metals in leachate were 141.72 ppm, 63.52 ppm, 82.93 ppm, 36.37 ppm and 75.86 ppm, resp.

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Application of sulphuric(VI) acid leaching for magnesium removal from zinc concentrate

Jarosiński A., Fela K.

Polish Journal of Chemical Technology

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2007

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Vol. 9, nr 2

19-22

EN

In this paper the results of investigation of magnesium removal from raw zinc concentrate have been presented. The raw materials derive from ZG Trzebionka and ZGH Bolesław. The differences in zinc and magnesium contents are characteristic of these materials. The experiments were carried out in the periodical reactor at 25°C using the H2SO4 solution of 20, 50, and 70% (v/v) concentration. The weight ratio of the solid phase to the liquid phase was 1:10 and 1:2. On the basis of the experimental results it can be stated that the application of sulphuric(VI) acid leaching permits to increase the zinc yield in Zn-Pb ore processing. This method permits to obtain zinc concentrate containing more than 60% Zn and MgO below 0.3% and CaO about 1.4%.