Smelting process for manufacturing matte by using Kivcet furnace

Abstract

According to the smelting process for manufacturing the matte through the Kivsett furnace, the desulfurization rate of the furnace charge in the flash smelting process of the Kivsett furnace is about 95% by increasing the copper-lead ratio of the furnace charge of the Kivsett furnace to 0.03 or above and reducing the oxygen-material ratio, and in the process, the Kivsett furnace can produce three phases, namely slag, the matte and lead bullion; the copper matte phase is positioned between the slag phase and the lead phase, and can be discharged through a copper matte opening in the side part of the electric heating area of the Kivcet furnace when a certain thickness of the copper matte phase is accumulated; according to the process method, matte products can be directly produced in the Kivsett furnace, the copper recovery smelting process is shortened, and new economic benefits are generated.

Description

Technical Field

[0001] The present invention relates to the technical field of Kivcet furnace smelting in pyrometallurgy, and specifically to a copper matte smelting process using a Kivcet furnace. Background Art

[0002] The Kivcet direct lead smelting process is a flash smelting process in which oxidation desulfurization and reduction are continuously completed in one unit, and crude lead can be directly produced. The furnace charge completes the oxidation reaction of sulfides in the reaction tower and melts the furnace charge particles, producing a melt composed of metal oxides, metal lead droplets and other components. When the melt passes through the coke filter layer on the surface of the settling tank, most of the lead oxide is reduced to metallic lead and settles to the bottom. The melt flows into the electrothermal zone through the lower opening of the water-cooled partition wall, and the slag and lead are further settled and separated. A lead layer is formed at the bottom and a slag layer is formed at the top, and then they are discharged through the slag discharge port at the end of the electrothermal zone and the lead discharge port on the side respectively.

[0003] When the above-mentioned Kivcet furnace works, it is necessary to strictly control the copper-lead ratio of the Kivcet furnace charge below 0.03, maintain the standard oxygen injection volume, dissolve the copper and other precious metals in the furnace charge into the lead phase, and enter the de-coppering pot together with the lead liquid discharged from the side lead port of the electrothermal zone of the Kivcet furnace for impurity removal and refining to obtain copper dross, and then enter the de-coppering furnace for copper matte smelting to obtain copper matte products.

[0004] However, with the continuous increase in the copper grade of lead-containing raw materials, it is necessary to develop a process for simultaneously producing copper matte during Kivcet furnace smelting. Summary of the Invention

[0005] The present invention has developed a copper matte smelting process using a Kivcet furnace. By increasing the copper-lead ratio of the Kivcet furnace charge above 0.03 and reducing the oxygen-to-charge ratio, the desulfurization rate of the furnace charge during the flash smelting process of the Kivcet furnace is about 95%. During this process, the Kivcet furnace can produce three phases, namely furnace slag, copper matte, and crude lead. The copper matte phase is located between the slag phase and the lead phase. When the copper matte phase accumulates to a certain thickness, it can be discharged through the copper matte port on the side of the electrothermal zone of the Kivcet furnace. This process method can directly produce copper matte products in the Kivcet furnace, shortening the copper recovery and smelting process and generating new economic benefits.

[0006] A copper matte smelting process using a Kivcet furnace, and the copper matte smelting process using a Kivcet furnace is specifically as follows:

[0007] (1) During the preparation of the Kivcet furnace charge, increase the dosage of copper-containing raw materials to increase the copper-lead ratio of the Kivcet furnace charge above 0.03;

[0008] (2) During the flash smelting process of the Kivcet furnace, reduce the oxygen injection volume to reduce the oxygen-to-charge ratio so that the desulfurization rate of the Kivcet furnace charge is about 95%;

[0009] (3) During this process, the three phases of slag, matte, and crude lead produced are further settled and separated in the electrothermal zone of the Kivcet furnace. When the matte phase accumulates to a certain thickness, it is discharged through the matte outlet on the side of the electrothermal zone to obtain the matte product.

[0010] The copper-lead ratio is the ratio of the mass of copper element to the mass of lead element in the Kivcet furnace charge.

[0011] Furthermore, the copper-lead ratio of the Kivcet furnace charge is above 0.04.

[0012] Furthermore, in step (2), the oxygen injection amount is reduced to 95%-98% of the standard value.

[0013] Furthermore, the thickness of the matte phase is generally 50-100 mm.

[0014] Advantages of the present invention:

[0015] 1. The Kivcet furnace matte product produced by this process method can be directly sold externally, shortening the copper recovery and smelting process, reducing the smelting cost, and generating new economic benefits.

[0016] 2. This process method further improves the ability of the Kivcet furnace to process high-copper materials, amplifies the characteristics of the strong adaptability of the Kivcet furnace raw materials, and enhances the company's core competitiveness. Specific implementation method

[0017] Example 1

[0018] A Kivcet furnace matte smelting process, and the Kivcet furnace matte smelting process is specifically as follows:

[0019] (1) During the preparation process of the Kivcet furnace charge, increase the proportion of copper-containing raw materials added to raise the copper-lead ratio of the Kivcet furnace charge to 0.04;

[0020] (2) During the flash smelting process of the Kivcet furnace, reduce the oxygen injection amount to 96% of the standard value, reduce the oxygen-to-charge ratio to make the desulfurization rate of the Kivcet furnace charge about 95%;

[0021] (3) During this process, the three phases of slag, matte, and crude lead produced are further settled and separated in the electrothermal zone of the Kivcet furnace. When the matte phase accumulates to a certain thickness, it is discharged through the matte outlet on the side of the electrothermal zone to obtain the matte product.

[0022] The copper-lead ratio is the ratio of the mass of copper element to the mass of lead element in the Kivcet furnace charge.

[0023] In our actual production, in the original process where the oxygen injection volume is the standard value, no matte is produced during the smelting in the Kivcet furnace. However, in the process of this embodiment, the oxygen injection volume is decreased by 4%. When a large amount of matte is produced in the Kivcet furnace and the daily average feed amount of the Kivcet furnace charge is 1280 t, 6 - 8 tons of matte are produced daily in the Kivcet furnace.

[0024] Finally, the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A matte smelting process using a Kifset furnace, characterized in that: The specific process of smelting copper matte in the Kifuset furnace is as follows: (1) In the process of preparing the charge for the Kifset furnace, the amount of copper-containing raw materials added was increased to increase the copper-lead ratio of the Kifset furnace charge to above 0.03; (2) reducing the oxygen injection amount during the flash smelting process of the Kifset furnace and lowering the oxygen-to-material ratio to make the desulfurization rate of the Kifset furnace charge around 95%; (3) The three phases of slag, matte and crude lead produced in this process are further settled and separated in the electric heating zone of the Kifset furnace. When the matte phase accumulates to a certain thickness, it is discharged through the matte port on the side of the electric heating zone to obtain a matte product.

2. The matte smelting process of the Kifset furnace according to claim 1, characterized in that: The copper-lead ratio of the Kifusite furnace charge is above 0.

04.

3. The matte smelting process of the Kifset furnace according to claim 1 is characterized in that: Step (2) reduces the oxygen injection rate to 95%-98% of the standard value.

4. The matte smelting process of the Kifset furnace according to claim 1, characterized in that: The thickness of the matte phase is generally 50-100mm.