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

Novel process of the high temperature reduction and detoxication of industrial chromic slag

A technology of industrial waste residue and chromium residue, which is applied in the direction of protection devices against harmful chemicals, can solve problems such as immature technology, and achieve the effects of simple equipment, promotion of chemical reactions, and large physical heat capacity

Inactive Publication Date: 2008-03-12
隋智通
View PDF7 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The biological method is to use microbial strains to reduce chromate in chromium slag to reduce Cr(VI) to Cr(III). This is a new method for chromium slag detoxification in recent years, but the technology is immature and still in research phase

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
  • Novel process of the high temperature reduction and detoxication of industrial chromic slag
  • Novel process of the high temperature reduction and detoxication of industrial chromic slag
  • Novel process of the high temperature reduction and detoxication of industrial chromic slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach (1

[0026] A certain amount of reducing metallurgical slag is weighed and filled in a slag pot, heated and melted, and the temperature after melting is controlled at 1200°C. When the temperature is constant, add chromium slag to the slag tank, and the water-soluble sodium chromate (Na 2 CrO 4 ) and acid-soluble calcium chromate (CaCrO 4 ) content are 0.5% and 0.2% respectively, the particle size of chromium slag is controlled below 20 mesh, the addition amount is 2% of the total amount of metallurgical slag, the reaction time is controlled at 5min, and naturally cooled to room temperature, in the obtained final slag, Cr(VI ) removal rate of 99.93% of the final slag.

Embodiment approach (2

[0028] A certain amount of reducing metallurgical slag is weighed and filled in a slag pot, heated and melted, and the temperature after melting is controlled at 1200°C. When the temperature is constant, add chromium slag to the slag tank, and the water-soluble sodium chromate (Na 2 CrO 4 ) and acid-soluble calcium chromate (CaCrO 4 ) content is 0.5% and 0.2% respectively, the particle size of chromium slag is controlled below 20 mesh, the addition amount is 2% of the total amount of metallurgical slag, the reaction time is controlled at 15min, and naturally cooled to room temperature, in the obtained final slag, Cr(VI ) removal rate of 99.95% of the final slag.

Embodiment approach (3

[0030] A certain amount of reducing metallurgical slag is weighed and filled in a slag pot, heated and melted, and the temperature after melting is controlled at 1200°C. When the temperature is constant, add chromium slag to the slag tank, and the water-soluble sodium chromate (Na 2 CrO 4 ) and acid-soluble calcium chromate (CaCrO 4 ) content is 0.5% and 0.2% respectively, the particle size of chromium slag is controlled below 20 mesh, the addition amount is 6% of the total amount of metallurgical slag, the reaction time is controlled at 5min, and naturally cooled to room temperature, in the obtained final slag, Cr(VI ) removal rate of 99.91% of the final slag.

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
particle sizeaaaaaaaaaa
Login to View More

Abstract

The present invention relates to a method for reducing detoxification of chromium residue under a high temperature with industrial wastes. Reducing metallurgy wastes in a waste tank are heated and melted. When the temperature becomes constant, the chromium residue is added into the tank. The toxicant in the chromium residue is Cr6 mainly in the form of water-soluble Na (SUB)2( / SUB)CrO (SUB)4 ( / SUB) and acid-soluble CaCrO (SUB)4( / SUB). Under the high temperature, Cr6 is reduced into intoxicant Cr3. After the chromium residue is cooled down to the room temperature naturally, the removal rate of Cr6 reaches over 99 percent in the final residue. The method is provided with an appropriate process flow, and the device is simple and easy for operation. Heat of the material itself is fully used, so the high efficiency is high, which is beneficial to the high-temperature reducing of chromium residue. The chromium residue is thoroughly detoxicated. Moreover, no environmental pollution is caused and the cost is low, so the method is applicable for scaled detoxification of chromium residue in the industry.

Description

1. Technical field [0001] The invention relates to a treatment process for detoxifying chromium slag, in particular to a method for reducing and detoxifying chromium slag by utilizing industrial waste residue at high temperature. 2. Background technology [0002] Chromium slag is a waste discharged during the production of chromium salts or ferrochrome alloys, and is one of the three recognized carcinogens. At present, the detoxification and disposal of chromium slag is a key issue restricting the sustainable development of my country's chromium salt and ferrochrome industry, and it is also an important technical problem that has not been solved reasonably and effectively. [0003] The detoxification and disposal technologies of chromium slag at home and abroad can be summarized into the following four main methods: solidification method, reduction method, complexation method and biological method. [0004] The solidification method uses physical or chemical methods to fix ...

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): A62D3/00
Inventor 隋智通石玉敏都兴红
Owner 隋智通
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