Acid mixing tower for recycling waste acid

Abstract

The utility model belongs to an acid mixing tower for recycling waste acid, which comprises a tower body, a spray pipe extending into the top of the tower body, a granular heavy metal adsorbent placing net cage arranged inside the tower body, a manhole arranged on the side wall of the tower body, a liquid outlet hole arranged on the side wall of the lower tower body, a fluorine / chloride ion separation chamber connected outside the liquid outlet hole, and a fluorine / chloride ion separation membrane arranged inside the liquid outlet hole. The stirring pipe is provided with a liquid circulating pipe, the liquid circulating pipe is connected to an external acid-resistant circulating pump, a liquid outlet pipeline of the acid-resistant circulating pump is connected to the side wall of the tower body at the height of the granular heavy metal adsorbent placing net cage and extends into the granular heavy metal adsorbent placing net cage, and the stirring pipe is provided with a plurality of liquid spraying ports which are spirally arranged. The device has the beneficial effects that spraying and granular heavy metal adsorbent are adopted, the contact area of the spraying and granular heavy metal adsorbent is large, and the stirring pipe sprays liquid irregularly for stirring, so that precipitates fall to the bottom of the tower body and are not accumulated on the surface of the adsorbent, and the adsorption effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to acid waste liquid recycling treatment technology relates to tower tank type foul acid processing apparatus. BACKGROUND

[0002] The smelting, chemical industry and other industries will have the foul acid to produce, the foul acid is the acid waste water containing impurities, such as the dilute sulfuric acid of smelting flue gas washing to remove particulate matter, after processing, it will have the harmful metal elements such as lead, copper, chromium, arsenic, fluoride ion, chlorine ion and other elements that accelerate the corrosion of equipment materials, and also such as the acid liquid generated by the metal plate pickling rust removal process, containing the plate surface element, the acidity is also reduced. At present, for the foul acid, there is neutralization method, sulfuration method, using lime, sodium hydrosulfide, hydrogen sulfide to neutralize the acidity, metal precipitation, then separate the slag liquid, but the subsequent sediment also still needs to be handled, and the acid is not utilized. At present, heavy metal adsorbent is used to remove metal ions in sewage, so that the foul acid flowing through the heavy metal adsorbent can remove a certain amount of metal ions, but the adsorbent covers the sediment, resulting in the decrease of adsorption. Therefore, the applicant designs a set of foul acid recycling equipment to improve the efficiency of heavy metal adsorbent. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a foul acid recycling mixed acid tower.

[0004] The utility model discloses a foul acid recycling mixed acid tower, containing tower body, the top of tower body stretches into spray pipe, and the spray pipe is used for the entry and spray of foul acid, and the inside of tower body is equipped with granular heavy metal adsorbent placing net cage, the height of granular heavy metal adsorbent placing net cage is equipped with manhole in the lateral wall of tower body, the lateral wall of tower body below granular heavy metal adsorbent placing net cage is equipped with liquid flow outlet hole, and the outside of liquid flow outlet hole is connected with fluorine / chlorine ion separation chamber, and the inside of fluorine / chlorine ion separation chamber is equipped with fluorine / chlorine ion separation membrane, and the lateral wall of tower body below granular heavy metal adsorbent placing net cage is connected with liquid circulation pipe, and liquid circulation pipe is connected to external acid-resistant circulating pump, and the liquid outlet pipe of acid-resistant circulating pump is connected to the lateral wall of tower body at the height of granular heavy metal adsorbent placing net cage and stretches into granular heavy metal adsorbent placing net cage, and the stretch-in section is stirring pipe, and stirring pipe is equipped with multiple liquid injection ports, and liquid injection ports are arranged in spiral shape.

[0005] Further, the bottom of the tower body is provided with a sediment discharge port.

[0006] The fluorine / chlorine ion separation membrane of the fluorine / chlorine ion separation chamber is laid flat, supported by a supporting net at the bottom, and a backflush valve is arranged above the fluorine / chlorine ion separation membrane.

[0007] The spray pipe is arranged in an annular array, provided with double annular pipes, and connected to the two annular pipes through branch pipes.

[0008] The utility model discloses a beneficial effect: adopt spray + granular heavy metal adsorbent form, on the basis of improving both contact area, granular heavy metal adsorbent is stirred with the liquid of agitator pipe at random time again, makes the precipitate fall to the bottom of tower body, does not accumulate on the surface of adsorbent, has improved the adsorption effect. Simultaneously is equipped with fluorine / chlorine ion separation membrane, removes fluorine / chlorine element. The treated waste acid can return the previous process step, realizes the recycling of acid liquid, reaches the effect of emission reduction. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is the structural schematic diagram of the utility model;

[0010] Figure 2 It is the schematic diagram of annular array spray pipe;

[0011] Figure 3 It is the schematic diagram of agitator pipe. PREFERRED EMBODIMENT

[0012] As Figure 1 , 3 Indicated, a kind of waste acid reuse mixed acid tower, containing tower body 1, tower body 1 top stretches into spray pipe 2, spray pipe 2 is used for waste acid to enter and spray, tower body 1 inside is equipped with granular heavy metal adsorbent placement net box 3, the height of granular heavy metal adsorbent placement net box 3 tower body 1 side wall is equipped with manhole 4, the liquid flow outlet hole 5 of granular heavy metal adsorbent placement net box 3 below tower body 1 side wall is equipped, liquid flow outlet hole 5 outside connection fluorine / chlorine ion separation chamber 6, fluorine / chlorine ion separation chamber 6 inside is equipped with fluorine / chlorine ion separation membrane 61, fluorine / chlorine ion separation membrane 61 below granular heavy metal adsorbent placement net box 3 tower body 1 side wall is connected with liquid circulation pipe 7, liquid circulation pipe 7 is connected to external acid-resistant circulating pump 8, the liquid outlet pipe 9 of acid-resistant circulating pump 8 is connected to the height of granular heavy metal adsorbent placement net box 3 tower body 1 side wall, and stretches into granular heavy metal adsorbent placement net box 3, and the section of stretching in is agitator pipe 91, agitator pipe 91 is equipped with multiple liquid injection ports 92, liquid injection port 92 is arranged in spiral shape. The tower body 1 bottom is equipped with precipitate discharge port 10.

[0013] Further, the fluorine / chlorine ion separation membrane 61 of the fluorine / chlorine ion separation chamber 6 is laid flat, supported by a supporting net at the bottom, and a backflush valve 62 is arranged above the fluorine / chlorine ion separation membrane 61. The self-flowing gravity of the acid liquid can be utilized to pass through the membrane structure, and a pump is omitted.

[0014] As Figure 2 Indicated, for spray pipe 2 can adopt annular array arrangement, be arranged as double ring pipe, respectively with two ring pipes through branch pipe intercommunication. The spraying area of the tower body is basically covered by the spraying of the inner and outer annular pipes.

[0015] Use: the polluted acid is sprayed from the spray pipe 2, falls to the granular heavy metal adsorbent placement net box 3, is adsorbed by the granular heavy metal adsorbent heavy metal element, liquid flows out from the granular heavy metal adsorbent placement net box 3, liquid outlet hole 5 flows out liquid, liquid enters fluorine / chlorine ion separation chamber 6, fluorine / chlorine ion separation membrane 61 is selectively impermeable to fluorine / chlorine ion, the acid liquid discharged from the fluorine / chlorine ion separation chamber 6 can be used for the flue gas washing of the flue gas acid making. Every interval time, acid-resistant circulating pump 8 is opened, the liquid below the granular heavy metal adsorbent placement net box 3 is guided into the stirring pipe 91, and the spiral arrangement of the liquid outlet 92 of the stirring pipe 91 is impacted and stirred to the granular heavy metal adsorbent, so that the sediment is stirred and falls to the bottom of the tower body 1, and after a period of interval time, the sediment is discharged from the sediment discharge port 10. After fluorine / chlorine ion separation membrane 61 is used for a period of time, the liquid outlet hole 5 valve is closed, the backflush valve 62 (normally in the normally closed state) is opened, the backwash water is connected from the fluorine / chlorine ion separation chamber 6 outlet, the fluorine / chlorine ion separation membrane 61 is backwashed, the backwash liquid flows out from the backflush valve 62, the function of the fluorine / chlorine ion separation membrane 61 is restored to a certain extent, and after the expected loss of efficiency, the fluorine / chlorine ion separation membrane 61 is replaced. Manhole 4 is opened, and the granular heavy metal adsorbent can be replaced, and the tower body top also has an outlet, and internal maintenance can be implemented. The granular heavy metal adsorbent and fluorine / chlorine ion separation membrane 61 are all products in the prior art, the granular heavy metal adsorbent adsorbs metal elements, reduces the harmful metal concentration of acid liquid, and the fluorine / chlorine ion separation membrane has selective permeability to fluorine / chlorine ion, so that fluorine / chlorine ion does not pass through, thereby reducing the fluorine / chlorine ion content of acid liquid.

Claims

1. A mixed acid tower for recycling spent acid, comprising a tower body (1), characterized in that: The tower body (1) top extends into the spray pipe (2), the spray pipe (2) is used for the dirty acid into and spray, the tower body (1) inside is equipped with the particle shape heavy metal adsorbent placement net box (3), the particle shape heavy metal adsorbent placement net box (3) is located height tower body (1) side wall is equipped with manhole (4), the particle shape heavy metal adsorbent placement net box (3) below tower body (1) side wall is equipped with liquid flow outlet hole (5), liquid flow outlet hole (5) outside connection fluorine / chloride ion separation chamber (6), fluorine / chloride ion separation chamber (6) inside is equipped with fluorine / chloride ion separation membrane (61), in the particle shape heavy metal adsorbent placement net box (3) below tower body (1) side wall is connected with liquid circulation pipe (7), liquid circulation pipe (7) is connected to external acid-resistant circulating pump (8), acid-resistant circulating pump (8) liquid outlet pipe (9) is connected to the particle shape heavy metal adsorbent placement net box (3) height tower body (1) side wall, and extends into the particle shape heavy metal adsorbent placement net box (3), the extension section is agitating pipe (91), agitating pipe (91) is equipped with multiple liquid injection ports (92), and the liquid injection port (92) is arranged in spiral shape.

2. A mixed acid tower for reusing spent acid as claimed in claim 1, wherein: The tower body (1) bottom is equipped with the sediment discharge port (10).

3. A mixed acid tower for reusing spent acid as claimed in claim 1, wherein: The fluorine / chloride ion separation membrane (61) of the fluorine / chloride ion separation chamber (6) is laid flat, and the bottom is supported by a supporting net, and a backflush valve (62) is arranged above the fluorine / chloride ion separation membrane (61).

4. The mixed acid tower for reusing spent acid according to claim 1, characterized in that: The spray pipe (2) is arranged in an annular array, and is provided with double annular pipes, which are communicated with the two annular pipes through branch pipes. The tower body (1) bottom is equipped with the sediment discharge port (10).

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