Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Method for treating hexavalent chromium wastewater by utilizing blast furnace slag

A technology of hexavalent chromium and blast furnace slag, which is applied in the field of blast furnace slag treatment of hexavalent chromium wastewater, can solve the problems of cumbersome process, secondary pollution, complicated operation, etc., and achieve the effect of simple treatment process, low operating cost and good adsorption effect

Inactive Publication Date: 2011-07-06
NORTHEASTERN UNIV
View PDF2 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the reduction method is that it consumes a large amount of chemicals, the process is cumbersome, the operation is complicated, and the treatment is not thorough, which is easy to cause secondary pollution; the microbial method has a long treatment period and the processing capacity is limited; The anti-pollution and anti-oxidation performance of organic matter in wastewater is poor. When there are many kinds of ions, the selectivity of this method to chromium is poor, and the regeneration and elution process is complicated, and the cost is high; adsorption method is a commonly used method to remove chromium in wastewater. The method of toxic ions has the advantages of large processing capacity, reusable use, simple operation and management, and low operating costs.
However, there are also some unavoidable shortcomings such as low adsorption capacity, long time required to reach adsorption equilibrium, or expensive chemical reagents required for the preparation process.

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 treating hexavalent chromium wastewater by utilizing blast furnace slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method steps of treating hexavalent chromium wastewater with blast furnace slag are as follows:

[0022] (1) First crush, ball mill and sieve the blast furnace slag to a particle size of 5 μm;

[0023] The chemical composition of blast furnace slag is as follows: TiO 2 25%, ∑Fe (total iron) 3%, SiO 2 23%, MgO7%, Al 2 o 3 13%, the rest is CaO.

[0024] (2) Use sulfuric acid with a concentration of 0.5 mol / l as an acidity agent to adjust the pH of the hexavalent chromium wastewater to 2.5; the concentration of hexavalent chromium in the hexavalent chromium wastewater is 10 mg / l.

[0025] (3) Add the hexavalent chromium wastewater with adjusted pH value into the container, put the container in the speed-regulating oscillator, and then add the blast furnace slag powder prepared in step (1) into the hexavalent chromium wastewater for adsorption treatment , oscillating at a speed of 180 rpm.

[0026] The mass ratio of the added blast furnace slag powder to the hexav...

Embodiment 2

[0031] The method steps of treating hexavalent chromium wastewater with blast furnace slag are as follows:

[0032] (1) First crush, ball mill and sieve the blast furnace slag to a particle size of 10 μm;

[0033] The chemical composition of blast furnace slag is as follows: TiO 2 30%, ∑Fe (total iron) 4%, SiO 2 18%, MgO5%, Al 2 o 3 16%, the rest is CaO.

[0034] (2) Using sulfuric acid with a concentration of 1 mol / l as an acidity agent, adjust the pH of the hexavalent chromium wastewater to 0.5; the concentration of hexavalent chromium in the hexavalent chromium wastewater is 15 mg / l.

[0035] (3) Add the hexavalent chromium wastewater with adjusted pH value into the container, put the container in the speed-regulating oscillator, and then add the blast furnace slag powder prepared in step (1) into the hexavalent chromium wastewater for adsorption treatment , oscillating at a speed of 300 rpm.

[0036] The mass ratio of the added blast furnace slag powder to the hexava...

Embodiment 3

[0041] The method steps of treating hexavalent chromium wastewater with blast furnace slag are as follows:

[0042] (1) First crush, ball mill and sieve the blast furnace slag to a particle size of 0.5 μm;

[0043] The chemical composition of blast furnace slag is as follows: TiO 2 20%, ∑Fe (total iron) 2%, SiO 2 30%, MgO10%, Al 2 o 3 10%, the rest is CaO.

[0044] (2) Using sulfuric acid with a concentration of 0.1 mol / l as an acidity agent, adjust the pH of the hexavalent chromium wastewater to 4.5; the concentration of hexavalent chromium in the hexavalent chromium wastewater is 5 mg / l.

[0045] (3) Add the hexavalent chromium wastewater with adjusted pH value into the container, put the container in the speed-regulating oscillator, and then add the blast furnace slag powder prepared in step (1) into the hexavalent chromium wastewater for adsorption treatment , oscillating at a speed of 50 rpm.

[0046] The mass ratio of the added blast furnace slag powder to the hexa...

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

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for treating hexavalent chromium wastewater by utilizing blast furnace slag. The method comprises the following steps of: crushing blast furnace slag and carrying out ball milling and sieving on the crushed blast furnace slag; adjusting the pH value of hexavalent chromium wastewater to be 0.5-4.5; adding the hexavalent chromium wastewater to a container, putting the container in a velocity-modulated oscillator, feeding the blast furnace slag powder into the hexavalent chromium wastewater for adsorption treatment, and adjusting the pH value of the wastewater reaching adsorption balance to be 7-9; and filtering the wastewater to remove solid matters. The method provided by the invention has a simple and convenient treatment process and has an operation cost lower than that of a conventional method, and the content of residential hexavalent chromium in the treated wastewater is 0.5 mg / l lower than the sewage discharge standard. The method not only has the advantages of a common adsorption method, but also has a low cost and a good adsorption effect due to adoption of the blast furnace slag as an adsorbent, and is a method for treating a waste by using another waste.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and relates to the treatment of chromium-containing wastewater, in particular to a method for treating hexavalent chromium wastewater with blast furnace slag. Background technique [0002] Chromium and its compounds are widely used in electroplating industry, metallurgical industry, mechanical processing industry, printing and dyeing industry, etc., and occupy an important position in the national economy. Among chromium species, hexavalent chromium is the most toxic and harmful, and has been identified as the "three causes" of carcinogenicity, teratogenicity, and gene mutation. Studies have shown that hexavalent chromium can be taken into the body by algae and accumulated through bioaccumulation, and long-term intake of hexavalent chromium will lead to plant death. Hexavalent chromium accumulated in plants is conducted through the food chain, posing a long-term threat to the ecologi...

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): C02F9/04C02F1/28C02F101/22
Inventor 雷雪飞薛向欣杨合王昱征
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
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