Rotary kiln dust collecting device

Abstract

The utility model relates to a rotary kiln dust collection device, which belongs to the technical field of metallurgical equipment and comprises a rotary kiln, the rotary kiln is provided with two groups of flue gas treatment equipment, the flue gas treatment equipment comprises a dust collection device communicated with the rotary kiln, and a plurality of selenium absorption towers connected in series are arranged on the dust collection device. The device is novel in design and has the advantages of being environmentally friendly, efficient and low in energy consumption, the dust collection device is additionally arranged between the rotary kiln and the selenium absorption tower, water vapor and dust in smoke can be effectively separated through a dust baffle in the dust collection device, smoke dust in the smoke is collected, the dust collection effect is good, and the dust collection effect is good. Smoke dust bonding in the smoke conveying pipeline is reduced, and the problem of blockage of the smoke conveying pipeline is solved; precious metal entrained in flue gas is effectively collected through the three-stage series selenium absorption tower, the content of crude selenium and gold and silver is reduced, and the gold and silver recovery rate is increased.

Description

Technical Field

[0001] The utility model relates to a rotary kiln dust collection device, belonging to the technical field of metallurgical equipment. Background Art

[0002] Copper anode slime, as a by-product of the electrolytic refining of crude copper, mainly contains valuable elements such as Cu, Pb, Se, Te, As, Sb, Bi, Au, Ag, and Pt, and is an important raw material for extracting rare precious metals.

[0003] During the treatment of copper anode slime, a rotary kiln is used for sulfuric acid roasting, and the selenium dioxide flue gas generated during the roasting process directly enters the selenium absorption tower to recover selenium. In this production system, on the one hand, due to the large amount of dust in the flue gas, it is easy to cause adhesion during flue gas transportation, resulting in a reduction in the cross-section of flue gas transportation and blocking the flue gas transportation; on the other hand, it leads to a high content of gold and silver in the produced selenium, resulting in a low direct recovery rate of gold and silver. Therefore, it is crucial to develop a rotary kiln dust collection device. Summary of the Utility Model

[0004] The utility model aims at the deficiencies existing in the above-mentioned prior art and provides a rotary kiln dust collection device.

[0005] The technical solution for the utility model to solve the above technical problems is as follows:

[0006] A rotary kiln dust collection device includes a rotary kiln, and the rotary kiln is provided with two groups of flue gas treatment devices. The flue gas treatment device includes a dust collection device communicated with the rotary kiln. The dust collection device is provided with a number of selenium absorption towers connected in series. A vacuum pump and a liquid storage tank are connected to the selenium absorption tower at the end.

[0007] Further, a dust baffle is arranged inside the dust collection device, a cleaning hole and a liquid level gauge are arranged at the top, a dust discharge pipe is arranged at the lower end, and a flue gas inlet and a flue gas outlet are respectively arranged on both sides.

[0008] Further, a dust discharge valve is arranged on the dust discharge pipe, and the dust discharge valve is electrically connected to a PLC control box.

[0009] Further, the dust baffle is located at one end close to the flue gas outlet, and the bottom is located below the flue gas outlet.

[0010] Further, the rotary kiln and the dust collection device are connected through a pipeline, and a stop valve for controlling the connection of the dust collection device is arranged on the pipeline.

[0011] Further, the number of the selenium absorption towers is at least three connected in series.

[0012] Further, adjacent selenium absorption towers are connected through a connecting pipe.

[0013] Further, a liquid discharge valve is arranged on the selenium absorption tower.

[0014] Further, a selenium discharge pipe is provided between the selenium absorption tower and the liquid storage tank, and the selenium discharge pipe is located below the liquid discharge valve.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: The design of this application is novel, with the advantages of environmental protection, high efficiency and low energy consumption. By adding a dust collection device between the rotary kiln and the selenium absorption tower, the baffle plate in the dust collection device can effectively separate the water vapor and dust in the flue gas, collect the soot in the flue gas, reduce the adhesion of soot in the flue gas conveying pipeline, and solve the problem of blockage of the flue gas conveying pipeline; The precious metals entrained in the flue gas are effectively collected through the three-stage series-connected selenium absorption tower, reducing the content of crude selenium, gold and silver, and improving the recovery rate of gold and silver. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the present utility model.

[0017] Figure 2 It is a schematic structural diagram of the dust collection device of the present utility model.

[0018] In the figure, 1, rotary kiln; 2, pipeline; 3, stop valve; 4, dust collection device; 5, baffle plate; 6, dust discharge valve; 7, dust discharge pipe; 8, selenium absorption tower; 9, connecting pipe; 10, liquid discharge valve; 11, vacuum pump; 12, selenium discharge pipe; 13, liquid storage tank; 14, PLC control box; 15, cleaning hole; 16, liquid level gauge; 17, flue gas inlet; 18, flue gas outlet. Specific Embodiments

[0019] The principles and features of the present utility model will be described below with reference to the accompanying drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.

[0020] As Figure 1 - Figure 2 shown, a rotary kiln dust collection device includes a rotary kiln 1. The rotary kiln 1 is provided with two groups of flue gas treatment devices. The flue gas treatment device includes a dust collection device 4 communicated with the rotary kiln 1. The dust collection device 4 is provided with a plurality of series-connected selenium absorption towers 8. A vacuum pump 11 and a liquid storage tank 13 are communicated with the selenium absorption tower 8 at the end.

[0021] Inside the dust collection device 4, there is a dust baffle 5. At the top, there are a material cleaning hole 15 and a liquid level gauge 16. At the lower end, there is a dust discharge pipe 7. On both sides, there are a flue gas inlet 17 and a flue gas outlet 18 respectively. The liquid level gauge 16 is used to monitor the liquid volume in the dust collection device 4. When the liquid storage reaches the set liquid volume, the interlock device, namely the PLC control box 14, is started to complete the discharging operation and the opening operation of the standby flue gas treatment equipment. The material cleaning hole 15 is a hole for regularly cleaning the material hanging on the inner wall of the dust collection device 4. One end of the dust baffle 5 close to the flue gas outlet 18 is used to block the flue gas, making the flue gas go downward, rising after passing over the dust baffle and then entering the flue gas outlet 18 pipeline, so as to achieve the purpose of dust removal. The dust collection device 4 has a relatively large volume cross-sectional area, which can greatly reduce pipeline blockage.

[0022] The dust baffle 5 is located at one end close to the flue gas outlet 18, and its bottom is below the flue gas outlet 18.

[0023] A dust discharge valve 6 is provided on the dust discharge pipe 7, and the dust discharge valve 6 is electrically connected to the PLC control box 14.

[0024] The rotary kiln 1 is connected to the dust collection device 4 through a pipeline 2, and a stop valve 3 for controlling the connection of the dust collection device 4 is provided on the pipeline 2.

[0025] The number of the selenium absorption towers 8 is at least three in series.

[0026] Adjacent selenium absorption towers 8 are connected through a connecting pipe 9.

[0027] A liquid discharge valve 10 is provided on the selenium absorption tower 8.

[0028] A selenium discharge pipe 12 is provided between the selenium absorption tower 8 and the liquid storage tank 13, and the selenium discharge pipe 12 is below the liquid discharge valve 10.

[0029] During use, the material in the rotary kiln 1 is subjected to sulfation roasting to generate flue gas and dust, which is evacuated by the vacuum pump 11. The cut-off valve 3 of one group is adjusted, and the flue gas enters one group of connected flue gas treatment equipment through the pipeline 2. At this time, the other group of flue gas treatment equipment is in a closed state. The flue gas treatment equipment operates in a one-use-one-spare mode. When the flue gas enters the dust collection device 4, the water vapor and dust in the flue gas are blocked by the dust baffle 5, and the mixture of water and dust falls into the lower end inside the dust collection device 4. When the liquid level in the dust collection device 4 reaches the value set by the liquid level gauge 16, an alarm signal is fed back to the control room and the cut-off valve 3 is closed. At the same time, the cut-off valve 3 of the other group is opened to activate the other group of flue gas treatment devices; the cut-off valve 3 of the alarmed group of flue gas treatment devices is closed, and the valve 6 is opened to discharge the liquid through the drain pipe 7 to the feed trough of the rotary kiln 1 or collect it separately to achieve the effect of flue gas dust removal. The flue gas after dust removal passes through the selenium absorption tower 8 (three of the same selenium absorption towers are connected in series for three-stage absorption) to recover selenium, realizing the separate recovery of precious metal dust and selenium in the flue gas and reducing the selenium content in gold and silver. The design of this application is novel, with the advantages of environmental protection, high efficiency and low energy consumption. By adding the dust collection device 4 between the rotary kiln 1 and the selenium absorption tower 8, the dust baffle 5 in the dust collection device 4 can effectively separate the water vapor and dust in the flue gas, collect the soot in the flue gas, reduce the adhesion of soot in the flue gas conveying pipeline, and solve the problem of blockage of the flue gas conveying pipeline; the precious metals entrained in the flue gas are effectively collected by the three-stage series-connected selenium absorption tower 8, reducing the content of gold and silver in crude selenium and improving the recovery rate of gold and silver.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotary kiln dust collection device, comprising a rotary kiln (1), characterized in that: The rotary kiln (1) is provided with two sets of flue gas treatment devices. The flue gas treatment device includes a dust collection device (4) communicated with the rotary kiln (1). A number of selenium absorption towers (8) connected in series are arranged on the dust collection device (4). A vacuum pump (11) and a liquid storage tank (13) are communicated with the selenium absorption tower (8) at the end.

2. The rotary kiln dust collection device according to claim 1, characterized in that: A dust baffle (5) is arranged inside the dust collection device (4). A material cleaning hole (15) and a liquid level gauge (16) are arranged at the top. A dust discharge pipe (7) is arranged at the lower end. A flue gas inlet (17) and a flue gas outlet (18) are respectively arranged on both sides.

3. The rotary kiln dust collection device according to claim 2, characterized in that: A dust discharge valve (6) is arranged on the dust discharge pipe (7). The dust discharge valve (6) is electrically connected with a PLC control box (14).

4. The rotary kiln dust collection device according to claim 2, characterized in that: The dust baffle (5) is located at one end close to the flue gas outlet (18), and the bottom is located below the flue gas outlet (18).

5. The rotary kiln dust collection device according to claim 1 or 2, characterized in that: The rotary kiln (1) is connected with the dust collection device (4) through a pipeline (2). A stop valve (3) for controlling the communication of the dust collection device (4) is arranged on the pipeline (2).

6. The rotary kiln dust collection device according to claim 1 or 2, characterized in that: The number of the selenium absorption towers (8) is at least three in series.

7. The rotary kiln dust collection device according to claim 1 or 2, characterized in that: Adjacent selenium absorption towers (8) are connected through a connecting pipe (9).

8. The rotary kiln dust collection device according to claim 1 or 2, characterized in that: A liquid discharge valve (10) is arranged on the selenium absorption tower (8).

9. The rotary kiln dust collection device according to claim 7, characterized in that: A selenium discharge pipe (12) is arranged between the selenium absorption tower (8) and the liquid storage tank (13). The selenium discharge pipe (12) is located below the liquid discharge valve (10).

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