Industrial Tests of Technology For Smelting Sulfide-Copper Concentrate at the Pobeda Oxygen Blast Smelter using Bottom T
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INDUSTRIAL TESTS OF TECHNOLOGY FOR SMELTING SULFIDE-COPPER CONCENTRATE AT THE POBEDA OXYGEN BLAST SMELTER USING BOTTOM TUYERES K. V. Bulatov,1 S. A. Yakornov,2 A. F. Ibragimov,3 and I. I. Iskhakov3
UDC 621.365.2: 669.2/8
The results of industrial tests of smelting sulfide copper concentrates on industrial oxygen using side and bottom tuyeres with a protective gas layer in the Pobeda smelting unit (PSU) at the Mednogorskiy Medno-Sernyy Kombinat (MMSK) are presented. Based on the analysis of the operating conditions of the PSU, the main results of the experimental meltings are discussed. The possibility of achieving the maximum charge throughput up to 475 ton/day with a specific oxygen consumption for the bottom tuyeres of 3250–3450 m 3 /h is demonstrated. The copper content in slags varies in the range of 2.5–3.0%, the copper concentration in the matte comprises 38.68%, and the SO 2 content in the exhaust gases equals 12.24 vol. %. The campaign duration of the bottom tuyeres was 4.6 days. Keywords: Pobeda smelter, bottom tuyere, oxygen blasting, specific productivity, smelting, charge, blowing.
Combined smelting of copper and polymetallic sulfide raw materials in the Pobeda smelting unit (PSU) has been used in Russian nonferrous metallurgy since 1995 [1–4]. During the operation of PSU, relatively low oxygen concentration (23–27 vol.%) blast was used. The purpose of the study is to evaluate the operation of the smelting unit on industrial oxygen (95 vol.% O 2 ). Industrial Test Procedure During industrial tests, oxygen was supplied via bottom tuyeres (BT, inner diameter 32 mm) equipped with a protective gas layer of the pipe-in-pipe design (slot thickness 4.5 mm), located in two rows at different angles of inclination relative to vertical axis of PSU with a step of 500 mm. Lateral tuyeres were also used without a protective shell, with only compressor air supplied. The relative position of the lateral and bottom tuyeres is shown in Fig. 1 from the inner side of the lining. There are typically four bottom tuyeres under the oxygen blast; the operating parameters of the tuyeres are presented in Table 1. During smelting, the blast was redistributed, increasing the number of operating bottom and reducing the number of operating lateral tuyeres. Industrial oxygen was supplied through the central pipe (main channel), and compressor air was supplied through the annular space. One tuyere (No. 2) was equipped with a vacuum water cooling system (VWCS), on which compressor air was used as the protective and primary gases. The volume of air oxygen introduced 1
Research and Planning Institute of Enrichment and Mechanical Processing of Mineral Resources (Uralmekhanobr, JSC), Russia, Yekaterinburg; e-mail: [email protected]. 2 Ural Mining and Metallurgical Company (UMMC), Russia, Verkhnyaya Pyshma; e-mail: [email protected]. 3
Mednogorskiy Medno-Sernyy Kombinat (MMSK), Russia, Mednogorsk; e-mail: [email protected].
Translated from Metallurg, Vol. 64, No. 8, pp. 56–60, August, 2020. Original article submitted March 27, 2020. 796
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