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A waste acid purification device and process

A technology of purification device and system device, applied in chemical instruments and methods, multi-stage water/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve the problems of environmental pollution, waste of resources, and low utilization rate of waste gas.

Active Publication Date: 2015-08-05
WUHAN FEIBOLE ENVIRONMENTAL PROTECTION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention proposes a waste acid purification device and process, which solves the problems of low waste gas recycling rate, environmental pollution, and waste of resources in the waste acid treatment process in the prior art

Method used

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  • A waste acid purification device and process
  • A waste acid purification device and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] This example purifies sulfuric acid from a copper smelting flue gas in Jinchang, Gansu Province. A part of dirty acid will be produced in the purification section. Originally, the plant used conical settling tanks to treat this part of the dirty acid, and the settled dirty acid was neutralized with lime. This will consume a large amount of lime, and this part of sulfuric acid resources will be wasted.

[0091] The company uses three-stage vulcanization reaction treatment and three-stage filter filtration. After dilute acid treatment and filtration, the indicators are very good. Most of them are reused in the purification section, and a small part is used in the dry suction section to prepare acid. Among them, the stock solution of waste acid is 100 kg, and the total mass of arsenic and heavy metals is 10.91 kg.

[0092] The operation steps are as follows:

[0093] Introduce 100 kg of waste acid stock solution into the first-stage stirring tank 22, add 30.73 kg of sodiu...

Embodiment 2

[0104] For the waste acid of a lead-zinc smelting acid factory in Jiyuan, Henan Province, a part of dirty acid will be produced in the purification section. Originally, the plant used ordinary settling tanks to treat this part of the dirty acid, and the settled dirty acid was neutralized with lime. A large amount of lime is consumed, and this part of the sulfuric acid resource is wasted.

[0105] The company uses the four-stage vulcanization reaction treatment in the present invention, four-stage filtration, and dilute acid treatment and filtration for reuse in the monoammonium phosphate production section. Among them, the stock solution of waste acid is 200 kg, and the total mass of arsenic and heavy metals is 16.37 kg.

[0106] The specific operation steps are as follows:

[0107] Introduce 100 kg of waste acid stock solution into the first-stage stirring tank 22, add 49.11 kg of sodium sulfide to the waste acid stock solution while stirring the waste acid stock solution, a...

Embodiment 3

[0120] A sulfur iron ore acid plant in Shayang, Hubei Province will produce some dirty acid in the purification section. Originally, the factory used inclined tube settler to treat this part of dirty acid, and the settled dirty acid was neutralized with lime. This will consume a large amount of lime, and this part of sulfuric acid resources will be wasted.

[0121] The company uses two-stage vulcanization reaction treatment, adopts two-stage FBL filter for filtration, and applies dilute acid treatment and filtration to acid distribution in the dry suction section. Among them, the stock solution of waste acid is 120 kg, and the total mass of arsenic and heavy metals is 8.62 kg.

[0122] The operation steps are as follows:

[0123] Introduce 100 kg of waste acid stock solution into the first-stage stirring tank 22, add 25.86 kg of sodium sulfide to the waste acid stock solution while stirring the waste acid stock solution, and simultaneously turn on the waste gas recovery syste...

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Abstract

The invention discloses waste acid purifying device and process and relates to the technical field of the chemical industry. The device comprises a sulfuration reaction system device, a waste gas recovery system device and a sludge treatment system device, wherein the sulfuration reaction system device comprises a sodium sulfide feeding tank provided with a sodium sulfide inlet and at least one stage of sulfuration device; each sulfuration device is provided with a stirring tank chemicals inlet, a tank gas outlet and an additive inlet; both the tank gas outlet and the gas outlet of a gas-liquid separating device are communicated with the waste gas recovery system device; a filter device is communicated with the sludge treatment system device; the waste gas recovery system device comprises at least one stage of waste gas reaction device; each waste gas reaction device is provided with a lye tank; each lye tank is provided with a lye inlet and a reaction liquid outlet; the reaction liquid outlet of the lye tank is communicated with the sodium sulfide feeding tank; the sodium sulfide feeding tank is communicated with all stages of stirring tanks. The waste acid purifying device disclosed by the invention is high in waste gas recycling rate in waste acid treatment, so that the environmental pollution and the resource waste are reduced.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a waste acid purification device and process. Background technique [0002] A large amount of waste acid will be produced in the sulfuric acid purification section from smelting flue gas and sulfuric acid production from pyrite, and a large amount of waste acid will also be produced in electroplating, steel plant pickling, waste batteries and other industries. Although the existing purification equipment has been improved, it still has the following deficiencies: [0003] (1) The existing purification equipment only neutralizes these waste acids with lime, and there is no waste gas treatment device, so the recycling rate of waste gas is not high. Disposal pollutes the environment, and most of the waste acid is neutralized, wasting resources. [0004] (2) In the process of using existing equipment to purify waste acid, a large amount of sodium sulfide needs to be cons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F11/12
Inventor 赵洪贵
Owner WUHAN FEIBOLE ENVIRONMENTAL PROTECTION ENG
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