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Recovering technology for waste acid

An acid recovery and process technology, applied in the field of waste acid recovery process, can solve the problems of long delay time for process parameter adjustment, complex process, and many power equipment, and achieve the effects of easy control, more process parameters, and less power equipment.

Active Publication Date: 2013-04-10
泰兴锦汇化工有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0005] This patent has solved the recovery problem of titanium dioxide waste acid very well, but the process still has the problems of complex process, many power equipments, and long delay time for process parameter adjustment

Method used

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  • Recovering technology for waste acid

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Embodiment Construction

[0015] Referring to the accompanying drawings, the whole process is composed of a vaporization separation process, an absorption separation process, and a waste acid preheating process.

[0016] (1) The vaporization separation process consists of a combustion device 1 , a temperature-controlled gas box 2 , a Venturi tube 3 and a cyclone separator 4 . Using gas as energy, gas B is pressurized to ≥5KPa and enters burner 1, air A is pressurized by blower 13 (≥5KPa), enters combustion chamber and temperature control gas box 2, enters Venturi tube 3, and enters Venturi tube 3 Throat sucks the preheated waste acid, vaporizes it quickly and enters the cyclone separator 4. The operating temperature of the cyclone separator 4 is controlled at about 380°C. Impurities (acid slag G) in the waste acid are separated in the cyclone separator 4. After separation, the flue gas is sent to the absorption separation process.

[0017] (2) The absorption and separation process is composed of a sec...

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Abstract

The invention aims at providing a recovering technology for waste acid, which is short in flow, high in adaptability, little in power equipment, easy to control and energy-saving. The technology is characterized in that the whole technology consists of a combustion and gasification separation system, a product acid generation and separation system and a waste acid preheating system. The technology has the benefits: (1) the whole technological flow is short, the power equipment is little, and investment and the operation costs can be saved, (2) technological parameters are easy to adjust, requirements of a wider waste acid treating concentration range and a wider product concentration range are met, the technology is suitable for recovering waste sulfuric acid with middle / low concentration (10-90%), the concentration of a recovery product can be adjusted, and the appropriate concentration is 70-90%, and (3) the recovering technology is low in energy consumption, and has considerable economic benefits.

Description

technical field [0001] The invention belongs to the field of waste acid treatment. The invention relates to a waste acid recovery process. Background technique [0002] Sulfuric acid is an industrial mother liquor. Many industries use sulfuric acid, especially the chemical industry, which produces a large amount of waste acid. For example, acid for mixed gas drying and acid for cleaning acetylene in the production of PVC by calcium carbide method produces high-concentration black waste sulfuric acid (concentration is 70%~ 95%), another example is that a large amount of waste acid of about 20% is produced in the production of titanium dioxide. These waste acids are difficult to recycle, causing great pressure on the ecological environment. [0003] Related patents on waste acid include: [0004] CN102730650A discloses a recovery process for titanium dioxide waste acid, which uses coal or gas as energy to recover sulfuric acid by adopting a temperature-controlled gasificati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90
CPCY02P20/129Y02P20/10
Inventor 陶俊徐继红
Owner 泰兴锦汇化工有限公司
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