Chromium resource recycling and detoxification processing method for chromium slag

A technology of resource recovery and treatment method, which is applied in the field of detoxification treatment of chromium slag and resource recovery and utilization, and achieves the effect of large processing capacity, quick effect, high social and economic benefits

Active Publication Date: 2016-10-12
SOUTH CHINA UNIV OF TECH
View PDF4 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a chromium slag resource recovery and detoxification treatment method with simple process, quick effect, thorough detoxification, which can fully recover chromium resources without causing secondary pollution.

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

[0045]1) Put 0.5 tons of chromium slag into a hydrothermal kettle, add water to make the solid-to-liquid ratio (w / w) 1:0.5, stir well, add potassium sulfate, potassium persulfate and sodium carbonate to make potassium sulfate in the system The concentration of potassium persulfate is 2 mol / L, the concentration of potassium persulfate is 1 mol / L, and the concentration of sodium carbonate is 1 mol / L, stir well, close the hydrothermal kettle, set the temperature at 30°C, and keep it warm for 10 h.

[0046] 2) After 10 h, stop heating, cool down to room temperature naturally, and let stand for 24 h.

[0047] 3) After standing still, pour out the supernatant containing hexavalent chromium in the upper layer. The solid residue after hydrothermal treatment is subjected to centrifugal washing and dehydration, and the filter residue is dried to obtain a white or white yellowish solid.

[0048] 4) Add an appropriate amount of CaCl to the separated supernatant and the water for washing ...

Embodiment 2

[0053] Take 1 ton of chromium slag and put it into a hydrothermal kettle, then add water to make the solid-to-liquid ratio (w / w) 1:5, stir well, add potassium sulfate, potassium persulfate and sodium carbonate to make the concentration of potassium sulfate in the system 2 mol / L, the concentration of potassium persulfate is 1 mol / L, the concentration of sodium carbonate is 0.1 mol / L, stir well, turn off the hydrothermal kettle, set the temperature at 250°C, keep it warm for 2 h, stop heating and let stand 0.5 h. Other technological process is identical with embodiment 1.

[0054] The concentration of hexavalent chromium leached from the original chromium residue in this example was 265 mg / L, and the concentration of hexavalent chromium leached from the filter residue after treatment was 1.48 mg / L.

Embodiment 3

[0056] Take 1 ton of chromium slag and put it into a hydrothermal kettle, then add water to make the solid-to-liquid ratio (w / w) 1:10, stir well, add potassium sulfate, potassium persulfate and sodium carbonate to make the concentration of potassium sulfate in the system 0.1 mol / L, the concentration of potassium persulfate is 1 mol / L, the concentration of sodium carbonate is 0.5 mol / L, stir well, close the hydrothermal kettle, set the temperature at 120°C, keep it warm for 6h, stop heating and let stand for 48 h. Other technological process is identical with embodiment 1.

[0057] The concentration of hexavalent chromium leached from the original chromium residue in this embodiment was 257 mg / L, and the concentration of hexavalent chromium leached from the filter residue after treatment was 1.26 mg / L.

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 a chromium resource recycling and detoxification processing method for chromium slag, and belongs to the field of detoxification processing and resource recycling for chromium slag. The method comprises the specific steps that 1, water is added into the chromium slag, and the water and the chromium slag are mixed to be uniform; 2, a mineralizing agent is added into the solution obtained in the step 1, sufficient stirring is carried out, and a mixed solution is obtained, wherein the mineralizing agent is prepared from potassium sulphate, potassium peroxodisulfate and sodium carbonate; 3, the mixed solution is processed through a hydrothermal method or a direct heating method; 4, after heating processing is finished, the solid-liquid mixture is naturally cooled to be at room temperature for standing; 5, solid slag is separated from liquid supernatant containing chromium, and the filter slag is washed with water and dried again; and 6, the solution containing chromium is recycled and returned into a workshop section, or chromium is recycled. The method is simple in process, low in cost, capable of becoming effective rapidly, large in processing capacity, thorough in detoxification and capable of achieving whole slag utilization, and has high social benefits and economic benefits.

Description

technical field [0001] The invention belongs to the field of detoxification treatment and resource recycling of chromium slag, and in particular relates to a chromium resource recovery and detoxification treatment method of chromium slag. Background technique [0002] Chromium slag is an industrial waste produced during the production of metallic chromium and chromium salts, and is highly toxic. If the chromium slag is piled up in the open air and soaked by rain and snow, the hexavalent chromium contained in it will be gradually dissolved and enter the surrounding soil, groundwater, rivers and lakes, seriously polluting the environment and causing harm to human health. Since my country is a big producer of chromium salts, in recent years, the country has discharged about 600,000 tons of chromium slag every year, and the accumulated chromium slag over the years has exceeded 6 million tons. The hazards of chromium slag cannot be fundamentally eliminated only by stockpiling ch...

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): C22B7/00C22B34/32
CPCC22B7/006C22B34/32Y02P10/20
Inventor 刘炜珍林璋刘学明荣文聪
Owner SOUTH CHINA UNIV OF TECH
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