Edge transmission top-blown converter and depleted sedimentation furnace combined lead dross treatment method

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to an edge transmission top-blown converter and depleted sedimentation furnace combined lead dross treatment method. The edge transmission top-blown converter and depleted sedimentation furnace combined lead dross treatment method comprises the following steps of (1) preparing and feeding materials, (2) smelting and (3) blowing, wherein in Step (1) 87-92% of lead dross, 3-5% of coke, 1-2% of scrap iron, and 4-6% of sodium carbonate by mass percent are uniformly mixed, and added to an edge transmission top-blown converter for 2-3 times; in step (2), the smelting is performed for 3-4h with the temperature of the edge transmission top-blown converter kept at 1000-1200 degrees, and a copper and dross mixed melt after the smelting is shifted to a depleted sedimentation furnace; and in Step (3), the blowing is performed for 2-4h with the temperature of the depleted sedimentation furnace kept at 1000-1200 degrees, and after stable liquid lead, copper matte and dregs produced in the depleted sedimentation furnace are laminated, copper sulfur, crude lead and slags are separated out. Compared with the existing lead dross treatment method, the edge transmission top-blown converter and depleted sedimentation furnace combined lead dross treatment method reduces the energy consumption and the consumption of the auxiliary materials (the coke, scrap iron and sodium carbonate) greatly, and the total cost is reduced by around 50%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for combined treatment of lead scum by an edge-driven top-blown converter and a depleted settling furnace. Background technique [0002] At present, the processes used in China to deal with lead scum mainly include fire process and wet process, among which fire process mainly includes reverberatory furnace method, converter method and electric furnace method, and wet process mainly includes acid leaching method, ammonia leaching method and alkali leaching method. Dip method. [0003] 1. The recovery rate of lead dross is relatively high when the reverberatory furnace plus blast furnace smelting method is used. The lead content in matte is relatively low, and the copper-lead ratio can reach 5-9. Moreover, this method requires less investment in equipment and has strong material adaptability. However, during the production process, the furnace temperature f...

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Problems solved by technology

The electric furnace smelting method has a small amount of flue gas, less metal loss, and high work efficiency, but consumes a lot of electric energy, and the area of ​​use is limited;

[0005] 3. When the acid leaching method is used to treat lead scum, the separation degree of lead and copper is relatively high, and the investment is small, but a large amount of lead slag is produced in the production process, and the liquid and solid are difficult to control, and there is little waste slag, which requires secondary treatment

[0007] 5. The separation effect of copper and lead by alkaline leaching method is good, the process is long, the investment is large, and the lead oxide produced needs further processing;

[0008] 6. The pyrotechnic process generally has shortcomings such as incomplete separation of lead and copper, low crude lead output rate, and high energy consumption. Although the wet process can separate copper and lead well, the liquid-solid separation in the production process is more troublesome;

[0009] 7. The reverberatory furnace is high in energy consumption and low in environmental protection. It is now a state-ordered elimination process. There are two types of side-blown furnaces, vertical and horizontal, which are currently under test, and the test results have not yet been clarified.

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