Method for rapidly cooling and slagging lead smelting hot-state slag

Abstract

The invention relates to a method for rapidly cooling and slagging lead smelting hot-state slag, which comprises the following process steps: high-temperature liquid-state slag produced in a lead smelting process flows out through a chute and is conveyed to a slagging device; the liquid lead smelting slag flows to a slagging device and is fully mixed with a cooling medium and a high-pressure medium in the slagging device; under the action of a high-pressure medium, the liquid lead smelting furnace slag is dispersed, meanwhile, under the action of a cooling medium, the dispersed furnace slag is rapidly cooled, due to rapid cooling, the dispersed furnace slag is further slagged to form fine particles, the particle size of the slag particles after rapid cooling and slagging is smaller than 20 mm, and the slag particles are directly used as a copper smelting charging raw material. According to the method, the cooling efficiency is remarkably improved, the hoisting, transferring and crushing cost is reduced, meanwhile, dust pollution is reduced, the field environment is optimized, and remarkable economic benefits and environmental protection benefits are achieved.

Description

Technical Field

[0001] The invention belongs to the field of metal smelting, and in particular relates to a method for rapidly cooling and slagging hot slag from lead smelting. Background Art

[0002] In traditional metallurgical processes, hot lead slag is typically poured into ladles or molds, forming large slag chunks. The transport and crushing of these large slag chunks not only consumes significant energy and labor, but also incurs additional handling costs. Furthermore, these large slag chunks cannot be used directly as raw material and must undergo further processing, such as crushing and screening, before they can be reintroduced into the production process. This not only prolongs the production cycle but also increases the costs of slag sorting and handling.

[0003] The shortcomings of existing technologies are as follows: (1) Low cooling efficiency, traditional cooling methods are time-consuming and cannot meet the needs of modern efficient production; (2) Large slag particles require additional crushing processing, which increases production costs; (3) High processing costs, and the transportation and crushing of large slag require a lot of manpower and material resources; (4) Low resource utilization: Large slag cannot be used directly as raw material, which reduces the effective utilization of resources.

[0004] At present, the industry's treatment of hot slag mainly relies on natural cooling or slow cooling methods. Although these methods are simple and easy to implement, they have problems such as low cooling efficiency, large slag particles, and high subsequent processing costs. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a method for rapidly cooling and slag-forming hot slag from lead smelting. The method comprises the following steps: the liquid slag is flowed to a slag-forming device, and mixed with a cooling medium and a high-pressure medium in the slag-forming device. Under the action of the high-pressure medium, the liquid slag is dispersed. Under the action of the cooling medium, the dispersed liquid slag is rapidly cooled. During the rapid cooling process, the dispersed slag is further slag-formed due to the rapid temperature drop. The slag particle size becomes small particles below 20 mm, and no longer needs to be transported or crushed, so that the slag can be directly used as raw material for copper smelting.

[0006] The technical solution of the present invention is achieved as follows: a method for rapidly cooling and slag-forming hot slag from lead smelting comprises the following process steps: a. The high-temperature liquid slag produced during the lead smelting process flows out through a chute and is transported to a slag treatment unit; b. The liquid lead smelting slag flows to the slag treatment unit, where it is fully mixed with the cooling medium and the high-pressure medium; c. Under the action of the high-pressure medium, the liquid lead smelting slag is dispersed. Simultaneously, under the action of the cooling medium, the dispersed slag is rapidly cooled. Due to the rapid temperature drop, the dispersed slag is further slagified to form fine particles. The particle size of the slag after rapid cooling and slagification is less than 20 mm. The used cooling medium is returned to the slagification device for reuse; d. Rapidly cool the slag particles after slag separation in the slag chamber to reduce the moisture content of the slag particles to below 15%. The slag particles are directly used as raw materials for copper smelting. e. The flue gas and dust generated during the rapid cooling and slagging process are removed by the high-efficiency dust removal device configured in the slagging chamber; Preferably, the slag-forming device includes a kettle-type, tank-type container-type mixer, or a combined jet-type split-type mixing device; Preferably, the high-pressure medium includes compressed air, nitrogen, and high-pressure water with a pressure greater than 0.1 MPa, and the cooling medium includes water, liquid nitrogen, and liquid argon with a temperature less than 50°C.

[0007] Hot slag comes from a wide range of sources, such as bottom-blown lead smelting furnaces, reverberatory furnaces, and other sources of liquid slag (temperature above 800°C). The beneficial effects of the present invention are: ⑴The cooling efficiency is extremely high, and the cooling time is shortened from several hours or even dozens of hours to less than 20 minutes, meeting the needs of modern efficient production; (2) The slag particles are extremely small, with the slag being slag with a particle size of less than 20 mm and a moisture content of less than 15%; (3) The processing cost is extremely low, which effectively reduces the large amount of manpower and material investment required for the additional transportation and crushing of large slag, thus saving production costs; ⑷ Extremely high resource utilization: The refined slag is directly used as raw material, which improves the effective utilization rate of resources, improves the utilization rate of resources and the economic benefits of production, and has great economic value and environmental protection significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0009] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings: A rapid cooling and slagging process for hot lead smelting slag, the detailed implementation steps are as follows: a. The lead slag produced during the copper slag smelting process in a reverberatory furnace with a temperature of about 1200°C flows through a chute to the top of the slagging device; b. The slagging device is arranged below the chute to provide high-pressure medium and cooling medium; c. The liquid hot lead smelting slag is mixed with the high pressure medium and the cooling medium at the edge of the slagging device; d. The high-pressure medium selected here is nitrogen at 0.7-1.0 MPa. The high-pressure medium rapidly disperses the hot lead smelting slag to a particle size of less than 20 mm; e. The cooling medium selected here is smelting wastewater with a pressure of 0.6-0.8MPa and a temperature of 30-35°C. If the hot dispersed slag is not rapidly cooled, it will continue to condense and grow, forming large lumps again. Therefore, the cooling medium is used to rapidly reduce the temperature, and the cooling medium is returned to the slag treatment unit for reuse; f. After high-pressure dispersion and low-temperature cooling, the small-sized slag undergoes initial sedimentation and water-slag separation in the slag chamber, ultimately forming a small-sized slag with a moisture content of about 15%. The small-sized slag is directly used as raw material for copper smelting. g. A dust removal device is installed in the slag-making chamber, and the smoke and dust generated during the slag-making process are discharged after absorption and dust reduction.

Claims

1. A method for rapidly cooling and slag-forming hot slag from lead smelting, characterized in that The process steps include: a. The high-temperature liquid slag produced during the lead smelting process flows out through a chute and is transported to a slag treatment unit; b. The liquid lead smelting slag flows to the slag treatment unit, where it is fully mixed with the cooling medium and the high-pressure medium; c. Under the action of the high-pressure medium, the liquid lead smelting slag is dispersed. Simultaneously, under the action of the cooling medium, the dispersed slag is rapidly cooled. Due to the rapid temperature drop, the dispersed slag is further slagified to form fine particles. The particle size of the slag after rapid cooling and slagification is less than 20 mm. The used cooling medium is returned to the slagification device for reuse; d. Rapidly cool the slag particles after slag separation in the slag chamber to reduce the moisture content of the slag particles to below 15%. The slag particles are directly used as raw materials for copper smelting. e. The flue gas and dust generated during the rapid cooling and slagging process are removed by the high-efficiency dust removal device configured in the slagging chamber.

2. The process for rapidly cooling and slag-forming hot slag from lead smelting according to claim 1, characterized in that The slagging device includes kettle type, trough type container type mixer, and combined jet type split type mixing device.

3. The process for rapidly cooling and slag-forming hot slag from lead smelting according to claim 1, characterized in that The high-pressure medium includes compressed air, nitrogen, and high-pressure water with a pressure greater than 0.1 MPa, and the cooling medium includes water, liquid nitrogen, and liquid argon with a temperature less than 50°C.

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