Method for extracting iron from iron-containing and zinc-containing wastewater and preparing iron oxide

A technology for iron oxide and wastewater, applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of complex process operation, high requirements for operators, high energy consumption, etc., and achieve ecological environment protection, low equipment requirements, and simple operation Effect

Inactive Publication Date: 2018-06-01
NORTHEASTERN UNIV
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The process operation is too complicated, the requirements for operators are high, and the energy consumption is high. Using this process to treat wastewater with low concentration of iron ions will not produce good economic benefits.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Get 2L of waste water and put it into a beaker, add 25ml of lye (mass percentage concentration is 15%) to the waste water containing iron and zinc, adjust the pH value to 4.5, and obtain a solution containing ferrous hydroxide.

[0025] Oxygen is introduced into the ferrous hydroxide liquid, and the air pressure is 0.5MPa. make part of Fe 2+ is oxidized to Fe 3 + , the oxidation time is 4 hours, during this process, continue to add 11ml of lye to keep the pH value at 5, and the solution turns yellowish brown, indicating that the oxidation is fully completed.

[0026] The oxidized zinc-containing iron-containing solution is filtered to obtain a filter cake of ferric hydroxide colloid and a zinc-containing solution.

[0027] After the filter cake was washed, it was dried at 80° C. for 6 hours, and weighed to be 2.15 g. Grinding it yields high-purity iron oxide.

Embodiment 2

[0029] Take 2L of waste water and put it into a beaker, add 13ml of lye (30% by mass) to the waste water containing iron and zinc, and adjust the pH value to 5.5 to obtain a solution containing ferric hydroxide.

[0030] Oxygen is introduced into the ferrous hydroxide liquid, and the air pressure is 0.5MPa. make part of Fe 2+ is oxidized to Fe 3 + , the oxidation time is 4h, the solution turns from light green to yellowish brown, then the oxidation is fully completed.

[0031] The oxidized zinc-containing iron-containing solution is filtered to obtain a filter cake of ferric hydroxide colloid and a zinc-containing solution.

[0032] After the filter cake was washed, it was dried at 80° C. for 6 hours, and it was weighed to be 2.43 g. Grinding it yields high-purity iron oxide.

Embodiment 3

[0034] Take 2L of waste water and put it into a beaker, add 10ml of lye (45% by mass) to the waste water containing iron and zinc, and adjust the pH value to 6 to obtain a solution containing ferric hydroxide.

[0035] Air is passed into the ferrous hydroxide liquid, and the air pressure is 0.4MPa. make part of Fe 2+ is oxidized to Fe 3 + , the oxidation time is 4h, the solution turns from light green to yellowish brown, then the oxidation is fully completed.

[0036] The oxidized zinc-containing iron-containing solution is filtered to obtain a filter cake of ferric hydroxide colloid and a zinc-containing solution.

[0037] After the filter cake is washed, it is dried at 60° C. for 8 hours and ground to obtain high-purity iron oxide.

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 provides a method for extracting iron from iron-containing and zinc-containing wastewater and preparing iron oxide and belongs to the field of waste recycling. The method comprises the following steps: adding liquid alkali into the iron-containing and zinc-containing wastewater and stirring; regulating the pH (Potential of Hydrogen) value of a iron-containing and zinc-containing solution to be 4 to 6.5 at 15 DEG C to 30 DEG C; meanwhile, introducing oxidizing gas and carrying out oxidization, wherein the oxidization time is 4 to 8h; after completely oxidizing, filtering to obtainiron hydroxide; drying under the condition that the temperature is 60 DEG C to 90 DEG C to obtain the iron oxide. The method provided by the invention is an effective and simple technology for recycling the iron from the iron-containing and zinc-containing wastewater of a hot dip galvanizing factory; the method has the advantages of small equipment investment, small energy consumption, high purity of a prepared product, environment protection and no pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of waste resource treatment and relates to a method for extracting iron from waste water containing iron and zinc and preparing ferric hydroxide. Background technique [0002] Iron oxide, chemical formula Fe 2 o 3 , Also known as burnt limonite, iron red, iron red, red powder and so on. It is easily soluble in strong acid and medium strong acid, and its appearance is reddish-brown powder. Its reddish-brown powder is a low-grade dye, which is called iron oxide red in the industry. It is used in paint, ink, rubber and other industries. It can be used as a catalyst, a polishing agent for glass, gemstones, and metals, and can be used as a raw material for ironmaking. It is insoluble in water and does not react with water. Soluble in acid, react with acid, not react with sodium hydroxide. Can be destroyed by CO, H at high temperature 2 , Al, C, Si and other reduction. It is an important inorganic non-metal...

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): C01G49/06
CPCC01G49/06
Inventor 高波刘畅王艺璇胡成龙周英伟
Owner NORTHEASTERN UNIV
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