A copper smelting flue gas acid production device

Abstract

This utility model relates to the field of copper smelting technology, specifically to a copper smelting flue gas acid production device, including a sulfidation reaction tank, a sulfidation thickener, several filter presses, and an emergency tank. The bottom inlet of the sulfidation thickener is connected to a feed pipe, and a control pump is fixedly installed at the other end of the feed pipe. The output end of the control pump is connected to the input ends of several filter presses via a diverter pipe. Air blowing pipes are installed at the top output ends of several filter presses, and return liquid pipes are installed at their bottom output ends. A control valve is installed at the path between the return liquid pipe and the air blowing pipe. This utility model, through the setting of the emergency tank, temporarily stores the solid-liquid mixture remaining after a filter press failure. This not only facilitates the handling of gas and liquid generated during the air blowing process but also effectively prevents the accumulation of solid-liquid mixture after a filter press failure, reducing the possibility of accidents and improving the reliability and safety of the entire filter press system.

Description

Technical Field

[0001] This utility model relates to the field of copper smelting technology, specifically to a copper smelting flue gas acid production device. Background Technology

[0002] The copper smelting flue gas sulfuric acid production process is an environmentally friendly resource utilization technology that converts sulfur dioxide (SO2) flue gas generated during pyrometallurgical copper smelting into industrial sulfuric acid through key steps such as purification, conversion, and absorption.

[0003] However, existing copper smelting flue gas acid production devices have several problems: 1) The filtration efficiency of the sulfide filter press is fixed, and the amount of water removed is limited; 2) The arsenic content in copper smelting flue gas is high, and arsenic and its compounds are toxic and hazardous chemicals, producing nearly 20 tons of arsenic sulfide slag daily. The treatment of this arsenic sulfide slag requires outsourcing to a qualified treatment unit, which is costly and increases production costs. Therefore, we propose a copper smelting flue gas acid production device. Utility Model Content

[0004] The purpose of this invention is to develop an improved process and its supporting equipment to solve the problem of arsenic-containing waste treatment and reduce treatment costs. By improving the efficiency of the filter press, the moisture content of the arsenic filter cake is reduced, thus lowering the cost of acid production and creating economic value for enterprises.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A copper smelting flue gas acid production device includes a sulfidation reaction tank, a sulfidation thickener, several filter presses, and an emergency tank. The bottom inlet of the sulfidation thickener is connected to a feed pipe, and a control pump is fixedly installed at the other end of the feed pipe. The output end of the control pump is connected to the input ends of several filter presses via a diverter pipe. Air blowing pipes are installed at the top output ends of the filter presses, and return liquid pipes are installed at their bottom output ends. A control valve is installed at the path between the return liquid pipe and the air blowing pipe. The other ends of the pipe and the blower pipe are respectively connected to the return liquid main pipe and the integrated pipe. A control valve two is installed at the path of the return liquid main pipe, and the other end of the return liquid main pipe is connected to the vulcanizing thickener. A control main valve is installed at the integrated path of the integrated pipe. The discharge end of the emergency tank is connected to the control pump through the second pipe. The output end of the control pump is connected to the vulcanizing reaction tank through the return pipe. The outer wall of the vulcanizing reaction tank is connected to the gravity flow pipe, and the other end of the gravity flow pipe is connected to the feed port of the vulcanizing thickener.

[0006] Preferably, the number of the filter presses is three, and the three filter presses are arranged in parallel, and the three filter presses are designated as filter press #1, filter press #2 and filter press #3.

[0007] Preferably, the output ends of the No. 1 filter press, No. 2 filter press and No. 3 filter press are connected to a drying box via an output line. The drying box is equipped with a steam pipe on its exterior, and the steam pipe passes through the drying box. The drying box is transported to the arsenic filter cake warehouse for storing arsenic filter cake via the production line.

[0008] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, through the design of an emergency tank, temporarily stores the solid-liquid mixture remaining after a filter press malfunction. This not only facilitates the handling of gases and liquids generated during the blowing process but also effectively prevents the accumulation of the solid-liquid mixture after a filter press malfunction, reducing the likelihood of accidents and improving the reliability and safety of the entire filter press system. Furthermore, the recovery through the sulfidation reaction tank effectively prevents the accidental release of toxic substances (such as arsenic compounds) and metal-containing solutions (such as copper-containing liquids), avoiding environmental pollution risks, and also achieves the recycling of reaction materials, combining environmental benefits with the economic efficiency required for production.

[0009] 2. This utility model utilizes the waste heat of by-product steam generated by an external boiler, which is converted into heat energy through a heat exchanger installed in the drying box. This heats and vaporizes the moisture in the arsenic filter cake, accelerating the drying process and effectively removing the water of crystallization from the arsenic filter cake. This reduces the moisture content of the arsenic filter cake, and the use of the heat released during the conversion process for drying reduces processing costs. Attached Figure Description

[0010] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application: Figure 1 This is a schematic diagram of the copper smelting flue gas acid production device described in Embodiment 1. In the diagram: 1. Vulcanizing thickener; 2. Control pump; 31. Filter press #1; 32. Filter press #2; 33. Filter press #3; 4. Control valve one; 5. Control valve two; 6. Main control valve; 7. Emergency tank; 8. Control pump; 9. Vulcanizing reaction tank; 10. Drying box; 11. Arsenic filter cake warehouse. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0012] A copper smelting flue gas acid production device, such as Figure 1As shown, the system includes a vulcanization reaction tank 9, a vulcanization thickener 1, several filter presses, and an emergency tank 7. The bottom inlet of the vulcanization thickener 1 is connected to a feed pipe, and a control pump 82 is fixedly installed at the other end of the feed pipe. The output of the control pump 82 is connected to the input ends of several filter presses via a diverter pipe. Air blowers are installed at the top output ends of the filter presses, and return liquid pipes are installed at their bottom output ends. Control valves 4 are installed along the paths of the return liquid pipe and the air blower. The other end is connected to a return liquid main pipe and an integrated pipe respectively. A control valve 5 is installed at the path of the return liquid main pipe, and the other end of the return liquid main pipe is connected to the vulcanizing thickener 1. A control main valve 6 is installed at the integrated path of the integrated pipe. The discharge end of the emergency tank 7 is connected to a control pump 82 through the second pipe. The output end of the control pump 82 is connected to the vulcanizing reaction tank 9 through the return pipe. The outer wall of the vulcanizing reaction tank 9 is connected to a gravity flow pipe, and the other end of the gravity flow pipe is connected to the feed port of the vulcanizing thickener 1.

[0013] There are three filter presses, which are arranged in parallel. The three filter presses are designated as filter press #1 (31), filter press #2 (32), and filter press #3 (33).

[0014] The by-product steam is generated by an external boiler. The output ends of filter press 31, filter press 32 and filter press 33 are connected to a drying box 10 through an output line. The drying box 10 is equipped with a steam pipe on the outside and the steam pipe is connected to the external boiler. The drying box 10 is transported to the arsenic filter cake warehouse 11 for storing arsenic filter cake through the production line.

[0015] In the operation of this copper smelting flue gas acid production device, the sulfidated liquid (i.e., a solid-liquid mixture) is added to the sulfidation thickener 1. The control pump 82 is then turned on, discharging the solid-liquid mixture into filter presses 1 (31), 2 (32), and 3 (33) respectively. Control valve 1 (4) is installed on the air duct and return liquid duct of each of the three filter presses, allowing simultaneous operation of all three presses. Control valve 2 (5) is installed on the main return liquid duct of each filter press, which can be closed during air purging to prevent… During the blowing process, excessive air pressure can cause contamination at the thickener site. Adding a valve to the blowing outlet pipe allows for the temporary storage of gas and water in emergency tank 7 in case of filter press failure. Pump 82 then controls the return of waste acid collected in emergency tank 7 to sulfidation reaction tank 9. In sulfidation reaction tank 9, the waste acid reacts with added sodium hydrosulfide solution, controlling the oxidation-reduction electrode potential (ORP) to remove impurities such as arsenic and copper. The treated liquid, after impurity removal, re-enters the sulfidation thickener 1 through a return pipe for further recycling. By setting up emergency tank 7, the solid-liquid mixture remaining after filter press failure is temporarily stored there. This not only facilitates the handling of gas and liquid generated during blowing but also effectively prevents the accumulation of solid-liquid mixture after a filter press failure, reducing the likelihood of accidents and improving the reliability and safety of the entire filter press system. Furthermore, the recycling of the sulfidation reaction tank 9 not only effectively prevents the accidental discharge of toxic substances (such as arsenic compounds) and metal-containing solutions (such as copper-containing liquids), avoiding the risk of environmental pollution, but also realizes the recycling of reaction materials, combining environmental benefits with the economic efficiency required for production.

[0016] The arsenic filter cakes produced by filter presses 31 (No. 1), 32 (No. 2), and 33 (No. 3) enter the drying chamber 10 via the output line. The arsenic filter cakes are then dried using byproduct steam generated by the boiler in the external conversion process (derived from deoxygenated water; the sulfur dioxide in the acid production process is converted into sulfur trioxide, releasing a large amount of heat, which is removed by the boiler). The heat energy generated by this byproduct steam is absorbed by the heat exchanger outside the drying chamber 10, thus achieving the drying effect. The dried arsenic filter cakes are then stored in the arsenic filter cake warehouse 11 via the product assembly line. Utilizing the waste heat from the byproduct steam generated by the external boiler, the arsenic filter cakes are heated and vaporized through the steam pipes in the drying chamber 10, accelerating the drying process and effectively removing the water of crystallization. This reduces the moisture content of the arsenic filter cakes, and using the heat released during the conversion process for drying reduces processing costs.

[0017] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0018] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A copper smelting flue gas acid production device, characterized in that: It includes a vulcanization reaction tank, a vulcanization thickener, several filter presses, and an emergency tank; The bottom inlet of the vulcanizing thickener is connected to a feed pipe, and a control pump is fixedly installed at the other end of the feed pipe. The output end of the control pump is connected to the input ends of several filter presses through a diversion pipe. A blower pipe is installed at the top output end of several filter presses, and a return liquid pipe is installed at their bottom output end. A control valve is installed at the path of the return liquid pipe and the blower pipe. The other ends of the return liquid pipe and the blower pipe are respectively connected to a return liquid main pipe and an integrated pipe. A control valve is installed at the path of the return liquid main pipe, and the other end of the return liquid main pipe is connected to the vulcanizing thickener. A control main valve is installed at the integrated path of the integrated pipe. The discharge end of the emergency tank is connected to a control pump through pipe two. The output end of the control pump is connected to the vulcanizing reaction tank through the return pipe. A gravity flow pipe is connected to the outer wall of the vulcanizing reaction tank, and the other end of the gravity flow pipe is connected to the inlet of the vulcanizing thickener.

2. The copper smelting flue gas acid production device according to claim 1, characterized in that: The number of the filter presses is three, and the three filter presses are arranged in parallel, and the three filter presses are designated as filter press #1, filter press #2 and filter press #3.

3. The copper smelting flue gas acid production device according to claim 2, characterized in that: The output ends of filter presses #1, #2, and #3 are connected to a drying chamber via output lines. A steam pipe is installed outside the drying chamber, which is connected to an external boiler. By-product steam generated by the external boiler is introduced into the drying chamber through the steam pipe. The drying chamber transports the arsenic filter cake to an arsenic filter cake warehouse for storage via the production line.

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