Waste acid recycling device

Abstract

The utility model relates to a waste acid recycling device which comprises a recycled acid storage tank, a negative pressure evaporator, a distillate storage tank and a vacuum pump compressor, the negative-pressure evaporator comprises a waste liquid chamber located at the bottom of the negative-pressure evaporator and an evaporation chamber located at the top of the negative-pressure evaporator, and the waste liquid chamber is communicated with the evaporation chamber; the bottom of the recycled acid storage tank is communicated with the top of the waste liquid chamber through a pipeline, and a plurality of groups of tube nests arranged along the vertical direction are arranged in the waste liquid chamber; an air outlet of the vacuum pump compressor is communicated with the top end of each tube nest through a pipeline, and an air inlet of the vacuum pump compressor is communicated with the top of the evaporation chamber through a pipeline; and the top of the distillate storage tank is communicated with the bottom end of each tube nest through a pipeline. The waste acid recycling device disclosed by the utility model is less in energy loss, can reduce salt and metal ions of saturated acid liquor, and ensures that recycled acid can be recycled.

Description

Technical Field

[0001] The utility model relates to waste acid recovery and utilization equipment, belonging to the technical field of waste acid treatment. Background Art

[0002] In the process of producing cold-drawn seamless steel pipes, hydrochloric acid or sulfuric acid pickling process is required. The sulfuric acid pickling process currently used is generally to dilute 98% concentrated sulfuric acid with tap water to a concentration of about 15%, and then heat the acid to 50 to 60°C for production. The waste acid produced is precipitated with ferrous sulfate through condensation crystallization equipment, and then the recycled acid is reused to pickle the steel pipe. However, after the recycled acid is repeatedly recycled for 5 times, the salt and metal ions in the acid will reach saturation, resulting in the recycled acid cannot be recycled again. The saturated recycled acid can only be entrusted to a third party for treatment, and the disposal cost is high. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a waste acid recovery and utilization device which has less energy loss, can reduce the salt and metal ions of saturated acid solution, and ensure that the recycled acid can be recycled.

[0004] The utility model proposes a technical solution to solve the above technical problems: a waste acid recovery and utilization device, comprising a reuse acid storage tank, a negative pressure evaporator, a distillate storage tank and a vacuum pump compressor; the negative pressure evaporator comprises a waste liquid chamber located at the bottom of the negative pressure evaporator and an evaporation chamber located at the top of the negative pressure evaporator, and the waste liquid chamber is connected with the evaporation chamber; the bottom of the reuse acid storage tank is connected with the top of the waste liquid chamber through a pipeline, and a plurality of groups of tubes arranged in a vertical direction are arranged in the waste liquid chamber; the air outlet of the vacuum pump compressor is connected with the top of each tube through a pipeline, and the air inlet of the vacuum pump compressor is connected with the top of the evaporation chamber through a pipeline; the top of the distillate storage tank is connected with the bottom of each tube through a pipeline.

[0005] Preferably, a drain port is provided at the bottom of the negative pressure evaporator.

[0006] Preferably, a condenser is provided on the pipeline connecting the distillate storage tank and each tube array.

[0007] Preferably, the condenser is a circulating water condenser.

[0008] Preferably, the negative pressure evaporator is a Hastelloy negative pressure evaporator.

[0009] Preferably, a heating component is provided in the waste liquid chamber.

[0010] Preferably, the heating element is a heating coil.

[0011] Preferably, a heating jacket is provided outside the waste liquid chamber.

[0012] Beneficial effects of the utility model: the waste acid recycling device of the utility model utilizes the principle of low-temperature negative pressure to reduce the salt and metal ions of saturated acid solution and ensure that the recycled acid can be recycled. The waste acid recycling device of the utility model first starts the vacuum pump compressor to form negative pressure in the evaporation chamber, and the recycled acid in the recycled acid storage tank can be automatically sucked into the waste liquid chamber. Due to the negative pressure, the recycled acid liquid can be turned into steam by heating it to 85°C, and the steam can continue to enter the waste liquid chamber to continue to heat the waste acid liquid. The metal ions and salts in the waste acid liquid remain at the bottom of the negative pressure chamber, and are regularly discharged and cooled to room temperature to become crystals. The liquid separated by distillation has a Ph value of about 2, and 98% concentrated sulfuric acid is added for proportioning and can be recycled, saving 98% of the amount of concentrated sulfuric acid. The waste acid recycling device of the utility model can fully realize automatic operation, without the need for personnel on duty, and can operate stably and continuously for 24 hours, with maintenance once every half a month. The maximum waste acid treatment capacity is 2,000 tons / year, and the energy loss is relatively small, which can effectively reduce costs and increase efficiency, ensuring that the recycled acid can be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The waste acid recovery and utilization device of the utility model will be further described below in conjunction with the accompanying drawings.

[0014] Figure 1 It is a structural schematic diagram of embodiment 1 of the utility model.

[0015] The above-mentioned reference numerals are as follows:

[0016] Recycled acid storage tank 1, negative pressure evaporator 2, waste liquid chamber 21, evaporation chamber 22, tube array 23, liquid discharge port 24, distillate storage tank 3, vacuum pump compressor 4, condenser 5. DETAILED DESCRIPTION

[0017] Example 1

[0018] In this embodiment, Figure 1 As shown, it includes a recycled acid storage tank 1, a negative pressure evaporator 2, a distillate storage tank 3 and a vacuum pump compressor 4. The negative pressure evaporator 2 includes a waste liquid chamber 21 located at the bottom of the negative pressure evaporator 2 and an evaporation chamber 22 located at the top of the negative pressure evaporator 2, and the waste liquid chamber 21 is connected to the evaporation chamber 22. The bottom of the recycled acid storage tank 1 is connected to the top of the waste liquid chamber 21 through a pipeline, and a plurality of groups of tubes 23 arranged in the vertical direction are provided in the waste liquid chamber 21. The air outlet of the vacuum pump compressor 4 is connected to the top of each tube 23 through a pipeline, and the air inlet of the vacuum pump compressor 4 is connected to the top of the evaporation chamber 22 through a pipeline. The top of the distillate storage tank 3 is connected to the bottom of each tube 23 through a pipeline.

[0019] A drain port 24 is provided at the bottom of the negative pressure evaporator 2. A condenser 5 is provided on the pipeline connecting the distillate storage tank 3 and each tube array 23. The condenser 5 is a circulating water condenser. The negative pressure evaporator 2 is a Hastelloy negative pressure evaporator. A heating component is provided in the waste liquid chamber 21. The heating component is a heating coil.

[0020] When the waste acid recycling device of this embodiment is working, the vacuum compressor 4 starts working first, so that negative pressure is formed in the negative pressure evaporator 2, the waste liquid of the recycled acid storage tank 1 is pumped into the waste liquid chamber 21, and the heating component is heated to 120°C to preheat the waste liquid. At this time, the evaporation chamber 22 is in a vacuum state. When the waste liquid in the waste liquid chamber 21 reaches 85°C, steam is formed in the evaporation chamber 22. The steam is transported to the distillate acid storage tank 3 through the tubes 23 through the vacuum compressor 4 and condensed into an acid liquid with a Ph value of about 2. Then, 98% concentrated sulfuric acid is added for proportioning and it can be recycled. The metal ions and salts in the waste acid liquid remain at the bottom of the waste liquid chamber 21, and are discharged regularly through the drain port 24 to become crystals after cooling to room temperature.

[0021] Example 2

[0022] The rest of this embodiment is the same as that of Embodiment 1, except that a heating jacket is provided outside the waste liquid chamber 21 .

[0023] Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A waste acid recovery and utilization device, characterized in that: The invention comprises a recycled acid storage tank (1), a negative pressure evaporator (2), a distillate storage tank (3) and a vacuum pump compressor (4); the negative pressure evaporator (2) comprises a waste liquid chamber (21) located at the bottom of the negative pressure evaporator (2) and an evaporation chamber (22) located at the top of the negative pressure evaporator (2), the waste liquid chamber (21) being connected to the evaporation chamber (22); the bottom of the recycled acid storage tank (1) is connected to the top of the waste liquid chamber (21) through a pipeline, and a plurality of groups of tubes (23) arranged in a vertical direction are arranged in the waste liquid chamber (21); the air outlet of the vacuum pump compressor (4) is connected to the top of each tube (23) through a pipeline, and the air inlet of the vacuum pump compressor (4) is connected to the top of the evaporation chamber (22) through a pipeline; the top of the distillate storage tank (3) is connected to the bottom of each tube (23) through a pipeline.

2. The waste acid recovery and utilization device according to claim 1, characterized in that: The bottom of the negative pressure evaporator (2) is provided with a liquid discharge port (24).

3. The waste acid recovery and utilization device according to claim 1, characterized in that: A condenser (5) is provided on the pipeline connecting the distillate storage tank (3) and each tube array (23).

4. The waste acid recovery and utilization device according to claim 3, characterized in that: The condenser (5) is a circulating water condenser.

5. The waste acid recovery and utilization device according to any one of claims 1 to 3, characterized in that: The negative pressure evaporator (2) is a Hastelloy negative pressure evaporator.

6. The waste acid recovery and utilization device according to any one of claims 1 to 3, characterized in that: A heating component is provided in the waste liquid chamber (21).

7. The waste acid recovery and utilization device according to claim 6, characterized in that: The heating element is a heating coil.

8. The waste acid recovery and utilization device according to any one of claims 1 to 3, characterized in that: A heating jacket is provided outside the waste liquid chamber (21).

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