Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for regenerating and recovering sulfuric acid from waste acid

A waste acid and sulfuric acid technology, applied in the direction of sulfur trioxide/sulfuric acid, chemical instruments and methods, water pollutants, etc., can solve the problems of no large-scale production and application, no sulfuric acid regeneration, and affecting the quality of sulfuric acid, etc., to achieve Huge environmental and social benefits, reduced water consumption, and pollution avoidance

Active Publication Date: 2010-06-30
HENAN YUGUANG GOLD & LEAD
View PDF2 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment methods for waste electrolyte solution are: ① The internationally advanced CX integrated system is used to deal with waste lead-acid batteries. 2 CO 3 The solution reacts with dilute sulfuric acid, and then processed into sodium sulfate. This treatment method also has shortcomings. If it is necessary to build a sulfate production plant, it will increase investment, and at the same time, the production of sulfate needs to increase raw materials, and the production chain will be extended.
②Extraction is used to separate the sulfuric acid in the electrolyte, and the sulfuric acid produced can be reused or sold as the electrolyte; this method is technically feasible, but the cost is high, and there is no large-scale production application
③ Domestic application (patent) No. 200710300074.7 proposes and implements the method of pouring out, collecting and recycling the electrolyte in the waste storage battery, and reclaims sulfuric acid quickly and effectively, but this method affects the quality of sulfuric acid, and the lead content in sulfuric acid increases greatly
④ Some secondary lead production units use alkali neutralization to neutralize the waste electrolyte and then discharge it. Although there is no pollution to water resources, a large amount of solid waste is generated when alkali such as lime is used to neutralize the electrolyte. cause secondary pollution
Regarding the polluted acid produced in the acid production process, there has been no report on the regeneration of sulfuric acid

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for regenerating and recovering sulfuric acid from waste acid
  • Method for regenerating and recovering sulfuric acid from waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: as figure 1 As shown, the SO 2 A large amount of dirty acid solution is produced during the purification process, except for 10% H 2 SO 4 In addition, it also contains harmful impurity elements such as lead, arsenic, antimony, and cadmium. When studying how to effectively regenerate and recover sulfuric acid in these waste sewage acid solutions, a method for regenerating sulfuric acid from waste sewage acid is adopted, which is characterized in that it includes Follow the steps below:

[0026] Step 1: The purchased H 2 S, CO 2 , N 2 The three gases contain H 2 S 25 liters, CO 2 200 liters, N 2 775 liters are mixed to make 1000 liters of purified gas;

[0027] Step 2: Pass the purified gas to the flow rate of 10-20m at a rate of 400-600L / h 3 / h, the stirring speed is in the waste sewage acid solution of 300-400rpm, make the heavy metal impurity in the waste sewage acid and S 2+ The reaction generates sulfides, and the purification and impurity r...

Embodiment 2

[0030] Embodiment 2: as figure 1 As shown, the secondary lead enterprises with flue gas acid production produce a small amount of electrolyte solution containing heavy metals when dismantling waste batteries. In order to effectively recover the sulfuric acid in it, a method of regenerating sulfuric acid from waste acid is adopted. It consists of the following steps:

[0031] Step 1: The purchased H 2 S, CO 2 , N 2 The three gases contain H 2 S 25 liters, CO 2 225 liters, N 2 250 liters of volume percentage are mixed to make 500 liters of purified gas;

[0032] Step 2: intermittently feed the purified gas at a rate of 400-600L / h to a volume of 20m 3 , stirring speed is 300-400rpm, filled with 15m 3 In the reaction kettle of the waste sewage acid solution, the heavy metal impurities in the waste sewage acid solution and S 2+ The reaction produces insoluble sulfides and precipitates, and the purification and impurity removal process of passing the purification gas into t...

Embodiment 3

[0035] Embodiment 3: as figure 1 As shown, there is an electrolyte solution containing a large amount of heavy metals in the waste batteries after use, and SO 2 During the flue gas purification process, a large amount of 10% H 2 SO 4 waste acid solution, for effectively regenerating and reclaiming the sulfuric acid in these waste acid solutions, adopting a method for regenerating and reclaiming sulfuric acid from waste acid, characterized in that: comprising the steps:

[0036] Step 1: First add the pure sulfate solution prepared from purchased sulfate or the sulfate solution produced after neutralization and sedimentation in the process of waste acid treatment into the sulfate biological reduction anaerobic reactor, and continuously Continuous preparation containing H 2 S 2.5-5%, CO 2 20-45%, N 2 50-77.5% purified gas;

[0037]Step 2: Pass the purified gas to the flow rate of 10-20m at a rate of 400-600L / h 3 / h, the stirring speed is in the waste sewage acid solution...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for regenerating and recovering sulfuric acid from waste acid generated in the production of the sulfuric acid or waste acid collected from waste lead-acid storage batteries, comprising the following steps of: firstly preparing purified gas containing H2S with volume percent of 2.5%-5%, CO2 with volume percent of 20%-45% and N2 with volume percent of 50%-77.5; supplying the purified gas to a waste acid solution with the flow rate of 10-20 m3 / h and the stirring speed of 300-400 rpm at the speed of 400-600 L / h so that heavy metal impurities in the waste acid solution and S2+ react to generate a sulfide; precipitating, filtering and separating the generated sulfide so that the sulfide is purified and removed from a dilute sulfuric acid solution; and replenishing the filtered dilute sulfuric acid solution which replaces new water into the dry-adsorbing procedure of a flue gas acid making systemso that the sulfuric acid in the waste acid solution is recovered into industrial sulfuric acid. The method has the advantages of low production cost, short flow, high cyclic utilization rate, low energy consumption, treatment of wastes by using wastes, small environmental pollution and high level of automation.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for regenerating and recycling sulfuric acid from waste dirty acid into industrial sulfuric acid from dirty acid produced in the production process of sulfuric acid or waste acid collected in waste lead-acid batteries, which belongs to the industry The category of waste recycling. Background technique [0002] With the rapid development of the automobile industry, used up waste batteries contain a large amount of heavy metals and electrolytes. Whether they are buried deep or piled up with bare leaks, the heavy metals and electrolytes in them will pollute groundwater, soil and the surrounding environment and endanger human health. , but at the same time waste batteries are valuable secondary resources that can be used by human beings, so the comprehensive utilization of waste batteries is of great significance. At present, the scale of domestic seco...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/92C02F1/52C02F101/10
Inventor 李卫峰蒋丽华赵波
Owner HENAN YUGUANG GOLD & LEAD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com