Method for preparing carbonate powder by smelting wastes by using stainless steel

A stainless steel and waste technology, which is applied in the field of carbonate powder preparation, can solve the problems of waste of resources, environmental pollution, metallurgical waste gas and waste acid environmental impact, and achieve the effect of increasing added value and reducing heat loss

Active Publication Date: 2019-11-15
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, steel slag is mainly used as building materials, sintering solvent, etc., but due to the toxic Cr contained in stainless steel slag 6+ A large amount of stainless steel slag is either used after harmless treatment or piled up in the slag yard, resulting in waste of resources and environmental pollution
At the same time, the production of a large amount of metallurgical waste gas and waste acid will undoubtedly have a great impact on the environment.

Method used

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  • Method for preparing carbonate powder by smelting wastes by using stainless steel
  • Method for preparing carbonate powder by smelting wastes by using stainless steel
  • Method for preparing carbonate powder by smelting wastes by using stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1: During the slagging process of AOD refined stainless steel production, add MnO mineral phase reconstruction agent whose mass is 1% of stainless steel slag, and cool to 20°C after slagging.

[0042] Step 2: Mechanically crush the stainless steel slag after mineral phase reconstruction, and select 300 g of stainless steel slag with a particle size of 1-5 mm. Use Rohm and Haas strong acid resin to absorb industrial waste acid to obtain HCl solution, add HCl to the obtained solution, adjust the pH of the solution to 2, and recycle the cleaned resin. Use 3000mL of the above-mentioned acid solution to pickle stainless steel slag with a particle size of 1-5mm in an ultrasonic oscillator. The specific acid leaching parameters are: ultrasonic oscillator power 100W, ultrasonic frequency 20KHz, temperature 20°C, leaching time 90min , stirring speed is 250rpm. After leaching, the filter residue was filtered to obtain solidified CO 2 initial solution.

[0043] Step 3: Add...

Embodiment 2

[0052] Step 1: During the slagging process of converter smelting stainless steel production, add MgO mineral phase reconstruction agent whose mass is 3% of stainless steel slag, and cool to 25° C. after slagging.

[0053] Step 2: Mechanically crush the stainless steel slag after mineral phase reconstruction, and select 300 g of stainless steel slag with a particle size of 9 mm. Adsorption of HCl+HNO by industrial waste acid with Rohm and Haas strong acid resin 3 solution, adding HCl to the resulting solution to adjust the pH of the solution to 4.5. The cleaned resin is recycled. Use 3500mL of the acid solution obtained above to carry out acid leaching of stainless steel slag with a particle size of 9mm in an ultrasonic oscillator. The speed is 410rpm. After leaching, the filter residue was filtered to obtain solidified CO 2 initial solution.

[0054] Step 3: Add KOH to the solution obtained in step 2, adjust the pH of the solution to 5.5, and add 17g of vinyl acetate-poly...

Embodiment 3

[0063] Step 1: During the slagging process of smelting stainless steel in electric furnace, add MnO ore phase reconstruction agent whose mass is 5% of stainless steel slag, and cool to 30°C after slagging.

[0064] Step 2: Mechanically crush the stainless steel slag after mineral phase reconstruction, and select 300g of stainless steel slag with a particle size of 10mm. Adsorption of industrial waste acid with Rohm and Haas strong acid resin to obtain HNO 3 +HF solution, adding HNO to the resulting solution 3 , adjust the pH of the solution to 4.8. The cleaned resin is recycled. Use 4000mL of the acid solution obtained above to carry out acid leaching of stainless steel slag with a particle size of 10mm in an ultrasonic oscillator. The speed is 480rpm. After leaching, the filter residue was filtered to obtain solidified CO 2 initial solution.

[0065] Step 3: Add NH to the solution obtained in Step 2 4 OH, adjust the pH of the solution to 5, and add 32 g of polyethylene...

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Abstract

The invention belongs to the technical field of comprehensive utilization of metallurgical resources, and particularly relates to a method for preparing carbonate powder by smelting wastes by using stainless steel. The method for preparing the carbonate powder by smelting the wastes by using the stainless steel comprises the steps that stainless steel smelting slag is subjected to on-line ore phase reconstruction, after cooling, leaching is conducted by using a metallurgical waste acid solution, and after filtration, a calcium and magnesium-rich solution is obtained, the pH value of a filter liquor is adjusted, and a structure-directing agent is added; metallurgical waste gas containing CO2 is introduced into the obtained solution to form a precipitate, and after filtration and drying, calcium carbonate powder and magnesium carbonate powder with regular shapes and sizes are obtained in sequence. By means of the method, on-line ore phase reconstruction of the stainless steel slag is achieved, a lot of calcium and magnesium are enriched into a phase easy to leach, chromium is enriched into a spinel phase, while chromium stabilization is considered, the resource utilization rate of the stainless steel slag is improved greatly, the carbonate powder can be widely used in the industries of building, paper making, rubber, medicines and the like, and it is achieved that wastes are controlled by wastes, and wastes are prepared into valuable things.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of metallurgical resources, in particular to a method for preparing carbonate powder from stainless steel smelting waste. Background technique [0002] In 2018, my country's crude stainless steel production was about 26.7 million tons, accompanied by about 8.01 million tons of steel slag and 48.06 million tons of carbon dioxide. In the metallurgical industry, the metal surface is pickled, and a large amount of waste acid solution will be produced for every ton of steel processed. With the progress of my country's production technology and the increasing demand for stainless steel, my country's stainless steel production has increased year by year, and it is also accompanied by the generation of a large amount of metallurgical waste (stainless steel slag, metallurgical waste gas and waste acid). At present, steel slag is mainly used as building materials, sintering solvent, etc.,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C01F5/24
CPCC01F5/24C01F11/181C01P2002/72C01P2004/03C01P2004/61C01P2006/80
Inventor 赵青梅孝辉刘承军史培阳姜茂发
Owner NORTHEASTERN UNIV
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