Журналы →  Tsvetnye Metally →  2019 →  №7 →  Назад

HEAVY NON-FERROUS METALS
Название Distribution of Cu, Pb, Zn and As between the products of the two-stage reduction depletion of high-copper slags
DOI 10.17580/tsm.2019.07.03
Автор Dosmukhamedov N. K., Fedorov A. N., Zholdasbay Е. Е.
Информация об авторе

Satbayev University, Almaty, Kazakhstan:

N. K. Dosmukhamedov, Associated Professor
Е. Е. Zholdasbay, Research Fellow

National University of Science and Technology MISiS, Moscow, Russia

A. N. Fedorov, Professor, e-mail: fedorov_a_n@mail.ru

Реферат

This paper describes an experimental study that aimed to find a way to deplete high-copper slags resultant from autogenous smelting. The study focused on arsenic and its behaviour during high-temperature reduction of slags. The authors did a comparative analysis of the well-known research papers to show that the coal reduction of slags would not help produce a copper alloy in a condensed phase. A high concentration of arsenic in the alloy impedes its further application. The paper examines the problem of two-stage depletion of high-copper slags in a severely reducing environment with natural gas and coal. It is shown that when natural gas is used as a reducing agent for slag, a high recovery of arsenic into dust can be reached even during the first stage. It is demonstrated that the consumption of natural gas exceeding by 30% the stoichiometric consumption necessary to reduce As2O5 to the volatile compound of As2O3 helps completely remove arsenic from the slag turning it into dust. Due to a combined use of natural gas and coal during the second stage, a high degree of selective recovery of non-ferrous metals into target products can be reached: copper into copper-iron alloy, and lead and zinc into dust. It was established that the optimum consumption of natural gas that equates to the minimum concentration of metals in the slag, %: 0.25 Cu; 0.06 Pb; 0.18 Zn, corresponds to the consumption of natural gas that by 30% exceeds the consumption that would be theoretically necessary for reducing their oxides. This would ensure the minimum concentration of iron in the alloy (0.08%) and a low concentration of the solid deoxidizer (i. e. coal). On the basis of experimental data and the balance sheet of materials drawn up for each experiment, the authors calculated how the non-ferrous metals and arsenic would distribute between the products of the two-stage deoxidizing depletion of slag with natural gas in the presence of coal as a function of the amount of natural gas consumed. The proposed method of the two-stage deoxidizing depletion of slag with natural gas in the presence of coal would not require a lot of investment and can be easily integrated with the current copper and lead production processes. Without much effort or great cost, the resultant products can be used to produce a broad range of commodities with a high added value.

Ключевые слова Slag, depletion, natural gas, coal, blending, alloy, non-ferrous metals, arsenic, powder, iron, distribution, recovery
Библиографический список

1. Ash С., Boruvka L., Tejnecky V., Šebek O., Nikodém A., Drábek O. Temporal dissolution of potentially toxic elements from silver smelting slag by synthetic environmental solutions. Journal of Environmental Management. 2013. Vol. 129. pp. 157–163.
2. Radojevic A. A., Serbula S. M., Kalinovic T. S., Kalinovic J. V., Steharnik M. M., Petrovic J. V., Milosavljevic J. S. Metal/metalloid content in plant parts and soils of Corylus spp. influenced by mining-metallurgical production of copper. Environmental Science and Pollution Research. 2017. Vol. 24, No. 11. pp. 10326–10340.
3. Rönnlund I., Reuter M., Horn S., Aho J., Aho M., Päällysaho M., Ylimäki L., Pursula T. Eco-efficiency indicator framework implemented in the metallurgical industry: part 2 — a case study from the copper industry. The International Journal of Life Cycle Assessment. 2016. Vol. 21, No. 12. pp. 1719–1748.
4. Shi С., Meyer С., Behnood А. Utilization of copper slag in cement and concrete. Resources, Conservation and Recycling. 2008. Vol. 52, No. 10. pp. 1115–1120.
5. Moskalyk R. R., Alfantazi A. M. Review of copper pyrometallurgical practice: today and tomorrow. Minerals Engineering. 2003. Vol. 16, No. 10. pp. 893–919.
6. Dosmukhamedov N., Egizekov M., Zholdasbay E., Kaplan V. Metal Recovery from Converter Slags Using a Sulfiding Agent. JOM. 2018. Vol. 70, No. 10. pp. 2400–2406.
7. Coursol Р., Valencia C. N., Mackey V. Р., Bell S., Davis B. Minimization of Copper Losses in Copper Smelting Slag During Electric Furnace Treatment. JOM. 2012. Vol. 64, No. 11. pp. 1305–1313.
8. Kotelnikova A. L., Ryabinin V. F. The material composition and the prospective utilization of copper smelter slag recycling waste. Litosfera. 2018. Vol. 18, No. 1. pp. 133–139.
9. Prince S., Young J., Ma G., Young C. Characterization and Recovery of Valuables from Waste Copper Smelting Slag. Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts. Berlin : Springer, Cham, 2016. pp. 889–898.
10. Komkov A. A., Kamkin R. I. Behaviors of copper and impurity elements during expulsion copper melt slags with CO – CO2 gas mixture. Tsvetnye Metally. 2011. No. 6. pp. 26–31.
11. Kotykhov M. I., Fedorov A. N., Lukavyy S. L., Khabiev R. P. Investigation of copper distribution between lead and slag in reducing bubble process. Tsvetnye Metally. 2014. No. 2. pp. 40–44.
12. Hughes S. Applying Ausmelt technology to recover Cu, Ni, and Co from slags. JOM. 2000. Vol. 52, No. 8. pp. 30–33.
13. Piret N. L., Partners S. Cleaning copper and Ni/Co slags: The technical, economic, and environmental aspects. JOM. 2000. Vol. 52, No. 8. pp. 18–20.

Language of full-text русский
Полный текст статьи Получить
Назад