Device for improving utilization rate of copper smelting waste acid sodium sulfide

Abstract

The utility model relates to a device for increasing the utilization rate of copper smelting waste acid sodium sulfide, which comprises a reaction kettle and a liquid conveying pipe, one side of the reaction kettle is provided with an acid inlet, and the other side of the reaction kettle is provided with an overflow port; the infusion tube is vertically arranged in the reaction kettle, the top of the infusion tube penetrates through the reaction kettle, and the bottom of the infusion tube is connected with an extension tube; the extension pipe is transversely arranged in the reaction kettle, and the height of the extension pipe is lower than that of the overflow port; a plurality of spray holes are formed in the extension pipe; a slag discharging opening is formed in the bottom of the reaction kettle; and a valve is mounted on the slag discharge port. Liquid sodium sulfide is sprayed out through the spray holes in the extension pipe, and the liquid sodium sulfide is sprayed out from the spray holes in the extension pipe under the action of pressure, is dispersed into waste acid and reacts with the waste acid, so that the reaction time of the sodium sulfide and the waste acid is prolonged, and the retention time of hydrogen sulfide generated by the sodium sulfide and the waste acid in the waste acid is prolonged; therefore, the sulfuration reaction is more sufficient, and the utilization rate of sodium sulfide is improved.

Description

A device for improving the utilization rate of sodium sulfide in copper smelting wastewater Technical Field

[0001] This utility model belongs to the field of copper smelting waste acid treatment technology, and specifically relates to a device for improving the utilization rate of sodium sulfide in copper smelting waste acid. Background Technology

[0002] Generally, copper smelting flue gas, after heat exchange in a waste heat boiler and dust collection by electrostatic precipitator, enters the sulfuric acid production purification process, forming waste acid. During the purification and washing process, arsenic trioxide and other heavy metals carried in the flue gas enter the waste acid. Because the waste acid contains a large number of harmful substances, it needs to be treated to eliminate its harm to water bodies and mitigate environmental risks. In industry, copper smelting waste acid is often treated using precipitation. This is because the solubility product of most metal sulfides is several orders of magnitude smaller than that of metal hydroxides (Ksp) (Ba). 2+ Ca 2+ (It does not generate sulfide precipitates) and its precipitation effect is superior to that of hydroxide precipitation, therefore, sulfide precipitation is widely used in the treatment of waste acid from smelting enterprises. Sulfide precipitation involves adding readily soluble sulfides to the wastewater and utilizing S... 2- It forms insoluble sulfide precipitates with heavy metal ions, and through solid-liquid separation, reduces the concentration of harmful metals in wastewater, realizes the reuse of waste acid, and eliminates environmental risks.

[0003] Sodium sulfide is typically used as the sulfiding agent in the sulfidation precipitation method for treating waste acid from copper smelting. During production, sodium sulfide is directly added to the waste acid sulfidation reactor via pipeline, where it undergoes vaporization and sulfidation on the surface of the waste acid. The reacted waste acid overflows into a thickener and then enters a secondary sulfidation reactor for secondary sulfidation. Sodium sulfide reacts with the waste acid to generate hydrogen sulfide gas. However, the amount of hydrogen sulfide gas participating in the sulfidation reaction on the surface of the waste acid is small, resulting in low utilization of sodium sulfide. Summary of the Invention

[0004] The purpose of this invention is to provide a device for improving the utilization rate of sodium sulfide in copper smelting waste acid, thereby increasing the waste acid treatment capacity.

[0005] To achieve the above objectives, the present invention provides a device for improving the utilization rate of sodium sulfide in copper smelting wastewater, comprising a reaction vessel and a delivery pipe.

[0006] The reactor is provided with an acid inlet on one side and an overflow outlet on the other side;

[0007] The infusion tube is vertically installed inside the reactor, with its top passing through the reactor and its bottom connected to an extension tube; the extension tube is horizontally installed inside the reactor, and its height is lower than the height of the overflow port; the extension tube has several spray holes.

[0008] The bottom of the reactor is provided with a slag discharge port; a valve is installed on the slag discharge port.

[0009] Preferably, the height of the acid inlet is higher than the height of the overflow port; a baffle plate is vertically fixed inside the reactor on one side of the acid inlet; the top of the baffle plate is higher than the height of the acid inlet, and the bottom of the baffle plate is between the overflow port and the extension pipe.

[0010] Preferably, all of the nozzles are oriented downwards or diagonally downwards.

[0011] Preferably, the extension tube has several sets of spray holes; each set of spray holes includes two spray holes arranged on the same vertical plane of the extension tube; the two spray holes are respectively oriented towards the obliquely downward sides of the extension tube.

[0012] Preferably, a stirring shaft is vertically installed inside the reactor; a stirring paddle is fixed on the stirring shaft.

[0013] Preferably, the reactor is provided with a negative pressure port at the top.

[0014] This utility model discloses a device for improving the utilization rate of sodium sulfide in copper smelting waste acid, which has the following advantages compared with the prior art:

[0015] (1) Liquid sodium sulfide is sprayed out through the nozzle on the extension tube. Under pressure, the liquid sodium sulfide is sprayed out from the nozzle of the extension tube and diffuses into the waste acid, reacting with the waste acid. This prolongs the reaction time between sodium sulfide and waste acid, and also prolongs the residence time of hydrogen sulfide generated by sodium sulfide and waste acid in the waste acid, thereby making the sulfidation reaction more complete and improving the utilization rate of sodium sulfide.

[0016] (2) By using the baffle, the waste acid entering the reactor is first in the cavity formed by the baffle and the inner wall of the reactor, and then flows from below the baffle to the side of the baffle near the overflow port to overflow, which prolongs the reaction time of sodium sulfide and waste acid and makes the sulfidation reaction more complete.

[0017] (3) The design is simple and easy to use. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the structure of this utility model;

[0019] Figure 2 is a longitudinal section view of the extension tube; Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] As shown in Figure 1, a device for improving the utilization rate of sodium sulfide in copper smelting wastewater includes a reaction vessel 1 and a liquid delivery pipe 2.

[0022] The reactor 1 is provided with an acid inlet 11 on one side and an overflow outlet 12 on the other side. Waste acid is pumped to the acid inlet 11 and enters the reactor 1. After the waste acid reacts with sodium sulfide, it overflows and is discharged through the overflow outlet 12.

[0023] The infusion pipe 2 is vertically installed inside the reactor 1, with its top passing through the reactor 1 and connected to the infusion pump. Its bottom is connected to an extension pipe 21 via an elbow. Liquid sodium sulfide is pumped into the infusion pipe 2 by the infusion pump and then into the extension pipe 21. The extension pipe 21 is horizontally installed inside the reactor 1, with its height lower than the overflow port 12, placing it below the surface of the waste acid and above the predetermined accumulation height of the sulfide slag. The extension pipe 21 has several nozzles 211 through which liquid sodium sulfide is sprayed. Under pressure, the liquid sodium sulfide diffuses from the nozzles 211 into the waste acid, reacting with it. This prolongs the reaction time between sodium sulfide and waste acid, and also prolongs the residence time of hydrogen sulfide generated from the reaction, thus making the sulfidation reaction more complete and improving the utilization rate of sodium sulfide.

[0024] The bottom of the reactor 1 is provided with a slag discharge port 13; a valve (not shown in the figure) is installed on the slag discharge port 13. After a certain amount of waste acid is treated, the valve is opened and the sulfide slag precipitated at the bottom of the reactor 1 is discharged through the slag discharge port 13.

[0025] In this embodiment, the height of the acid inlet 11 is higher than the height of the overflow port 12; a baffle 14 is vertically provided inside the reactor 1 on one side of the acid inlet 11, and the two sides of the baffle 14 are fixed to the inner wall of the reactor 1; the top height of the baffle 14 is higher than the height of the acid inlet 11, and the bottom height is between the overflow port 12 and the extension pipe 21. Through the baffle 14, the waste acid entering the reactor 1 first flows in the cavity formed by the baffle 14 and the inner wall of the reactor 1, and then flows from below the baffle 14 to the side of the baffle 14 near the overflow port 12 for overflow, which prolongs the reaction time of sodium sulfide and waste acid and makes the sulfidation reaction more complete.

[0026] In this embodiment, all of the nozzles 211 face downward or diagonally downward. By setting the nozzles 211 at the bottom of the extension tube 21, the sulfide slag generated by the reaction is prevented from clogging the nozzles 211.

[0027] Furthermore, as shown in Figure 2, the extension pipe 21 is provided with several sets of spray holes 211; each set of spray holes 211 includes two spray holes 211 arranged on the same vertical plane of the extension pipe 21; the two spray holes 211 are respectively oriented towards the obliquely downward sides of the extension pipe 21. By setting two spray holes 211 on the same vertical plane of the extension pipe 21, it is easy to increase the number of spray holes 211 and reduce the problem of sulfide slag clogging the extension pipe 21.

[0028] In this embodiment, a stirring shaft 31 is vertically installed inside the reactor 1; a stirring paddle 32 is fixed on the stirring shaft 31, and a motor (not shown in the figure) is fixed above the reactor 1. The output shaft of the motor is connected to the stirring shaft 31. The stirring shaft 31 is driven by the motor to rotate the stirring paddle 32, thereby stirring the waste acid and facilitating the full reaction between sodium sulfide and waste acid.

[0029] In this embodiment, the top of the reactor 1 is provided with a negative pressure port 15, which is connected to an external vacuum pump or fan to create a micro-negative pressure environment inside the reactor 1. The generated hydrogen sulfide gas can only flow towards the negative pressure port 15 to avoid leakage of hydrogen sulfide gas.

[0030] The method of using this utility model is as follows: The waste acid is pumped into the reaction vessel 1 through the waste acid pump, so that the liquid level reaches above the bottom of the baffle plate 14. Then, liquid sodium sulfide is pumped into the delivery pipe through the delivery pump, and then enters the extension pipe 21 and is sprayed into the waste acid through the nozzle to react with the waste acid. The sodium sulfide reacts with the waste acid to generate hydrogen sulfide gas. The hydrogen sulfide gas reacts with the heavy metal ions in the waste acid in a sulfidation reaction (gas-liquid reaction), thereby generating sulfide precipitates and achieving the removal of heavy metal ions.

Claims

1. A device for improving the utilization rate of sodium sulfide in copper smelting wastewater, characterized in that, The reactor includes a reaction vessel (1) and a delivery pipe (2). The reaction vessel (1) has an acid inlet (11) on one side and an overflow port (12) on the other side. The delivery pipe (2) is vertically installed inside the reaction vessel (1), with its top passing through the reaction vessel (1) and its bottom connected to an extension pipe (21). The extension pipe (21) is horizontally installed inside the reaction vessel (1), and the height of the extension pipe (21) is lower than the height of the overflow port (12). Several spray holes (211) are opened on the extension pipe (21). The bottom of the reaction vessel (1) is provided with a slag discharge port (13). A valve is installed on the slag discharge port (13).

2. The apparatus for improving the utilization rate of sodium sulfide in copper smelting wastewater according to claim 1, characterized in that, The height of the acid inlet (11) is higher than the height of the overflow port (12); a baffle plate (14) is vertically fixed inside the reactor (1) on one side of the acid inlet (11); the top of the baffle plate (14) is higher than the height of the acid inlet (11), and the bottom is between the overflow port (12) and the extension pipe (21).

3. The apparatus for improving the utilization rate of sodium sulfide in copper smelting wastewater according to claim 1, characterized in that, Several of the nozzles (211) are oriented downwards or diagonally downwards.

4. The apparatus for improving the utilization rate of sodium sulfide in copper smelting wastewater according to claim 1, characterized in that, The extension tube (21) is provided with a number of spray holes (211); each set of spray holes (211) includes two spray holes (211) arranged on the same vertical plane of the extension tube (21); the two spray holes (211) are respectively facing the oblique downward sides of the extension tube (21).

5. The apparatus for improving the utilization rate of sodium sulfide in copper smelting wastewater according to claim 1, characterized in that, The reactor (1) is vertically mounted with a stirring shaft (31); a stirring paddle (32) is fixed on the stirring shaft (31).

6. The apparatus for improving the utilization rate of sodium sulfide in copper smelting wastewater according to claim 1, characterized in that, The reactor (1) is provided with a negative pressure port (15) at the top.

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