A method for resourceful treatment and comprehensive recycling of electroplating sludge

A technology of electroplating sludge and recycling, which is applied in the direction of improving process efficiency, etc., can solve problems such as feasibility study reports and environmental impact assessment reports that are difficult for countries and governments to pass, affect the operating environment, consume oxidants, and achieve environmentally friendly production processes. The effect of short technological process and short construction period

Active Publication Date: 2017-12-19
广西银亿再生资源有限公司 +1
View PDF9 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) The state controls hexavalent chromium very strictly, and it is difficult to pass the state and government approval in the feasibility study report and environmental impact assessment report
(3) The process is too long, the pH value is increased in stages, iron, nickel, copper, zinc, magnesium and other metals are precipitated and filtered in sequence, and 6 to 8 times of filtration and washing are required, so it is difficult to ensure that the human body does not touch during the production process Hexavalent chromium, there is production safety
(4) The material contains organic matter such as flocculants and brighteners, which will greatly consume oxidants, thereby increasing the amount of oxidants
(2) NH 3 When the concentration is greater than 18%, ammonia is easy to volatilize, which not only causes the loss of ammonia, but also affects the operating environment, so the requirements for the sealing of the device are relatively high
[0011] There are limitations in the above three methods for treating chromium, and it is impossible to achieve large-scale and continuous production automation. Therefore, new ideas and processes are needed to treat electroplating sludge

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
  • A method for resourceful treatment and comprehensive recycling of electroplating sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A method for resourceful treatment and comprehensive recycling of electroplating sludge, comprising the following specific steps:

[0049] a) Pretreatment: Slurry, wash and screen 181.82kg of electroplating sludge first, then enter the super-thickener for thickening, press filter the underflow, and return the supernatant to slurry, wash and recycle. After the content of COD and other impurities in the washing water reaches 1000-3000mg / L, the special resin is used to remove COD, part of the washing water is recycled, and part of it enters the electrocoagulation wastewater treatment system for treatment to remove chlorine, nitrate, and trace heavy metals before being discharged up to standard. The expired resin and electric flocculation slag enter the pyrotechnic rotary drying kiln and then enter the high-temperature environmental protection reduction melting furnace for harmless disposal.

[0050] b) Acid leaching: add 27.27 kg of concentrated sulfuric acid with a mass c...

Embodiment 2

[0060] A method for resourceful treatment and comprehensive recycling of mixed materials such as electroplating sludge, chromium slag, copper-nickel sludge, etc., comprising the following specific steps:

[0061] a) Pretreatment: 9.69kg of electroplating sludge, chromium slag, copper-nickel sludge and other mixed materials are first slurried, washed and sieved, and the underscreen is filtered, and the filtrate is collected and mixed evenly. The impurity content is 200-250mg / L. Special resin is used to remove COD. Part of the washing water can be recycled, and part of it enters the electrocoagulation wastewater treatment system for treatment to remove chlorine, nitrate and trace heavy metals and then discharges up to the standard. The expired resin and electric flocculation slag enter the pyrotechnic rotary drying kiln and then enter the high-temperature environmental protection reduction melting furnace for harmless disposal.

[0062] b) Acid leaching: Add 1.36 kg of concentra...

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 discloses an electroplating-sludge resourceful treatment and comprehensive recycling method. The method mainly includes the steps of pretreatment, acid leaching, copper extracting, nickel and cobalt extracting, chrome taking through precipitating, precipitated zinc neutralizing, manganese taking through adsorbing and sodium salt recycling. According to the method, under the condition of the low pH value, valuable metal such as copper, nickel, cobalt, chrome, zinc, manganese and the like is effectively and sequentially recycled, chrome is deeply removed through one-time chrome precipitating and magnetic fluid flawing growing with a phosphoric acid method, virose hexavalent chromium is not produced in the period, and therefore the chrome is produced in a high-value-added chemical product manner and becomes available resources. After being treated, waste water can be discharged outwards or reused when meeting the national standard, resourceful-and-innocent treatment and comprehensive recycling of electroplating sludge are achieved accordingly, the technological process is short, the adaptability of raw materials is high, and the metal recovery percent can be higher than 90%. In this way, the comprehensive process cost is markedly reduced, and economic benefits and social benefits are obvious.

Description

technical field [0001] The invention relates to a treatment method of electroplating sludge, in particular to a method for resourceful treatment and comprehensive recycling of electroplating sludge. Background technique [0002] The electroplating industry is an indispensable basic industry in the national economy, and it is also one of the three major polluting industries in the world today. The solid waste generated by the electroplating industry is mainly electroplating sludge, which is listed as hazardous waste because of its high mass fraction of heavy metals , In recent years, the number of electroplating enterprises in my country has grown rapidly, and most of the electroplating enterprises are small in scale, outdated in equipment, and low in management level, resulting in a large amount of sludge with complex components, and the disposal methods and resource technology of electroplating sludge. Research has become one of the urgent problems to be solved in our country...

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 Patents(China)
IPC IPC(8): C22B7/00C22B15/00C22B19/30C22B23/00C22B34/32C22B47/00
CPCY02P10/20
Inventor 朱红斌何嘉靖梁君来韦志伟
Owner 广西银亿再生资源有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap