A method for preparing carbonate powder using stainless steel smelting waste

A stainless steel and waste technology, applied in magnesium carbonate, chemical instruments and methods, calcium carbonate/strontium/barium, etc., can solve the problems of waste of resources, pollution, metallurgical waste gas and environmental impact of waste acid, etc., to reduce heat loss , the effect of increasing added value

Active Publication Date: 2021-10-08
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for preparing carbonate powder using stainless steel smelting waste
  • A method for preparing carbonate powder using stainless steel smelting waste
  • A method for preparing carbonate powder using stainless steel smelting waste

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 ore 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-polyviny...

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, in particular to a method for preparing carbonate powder from stainless steel smelting waste. A method for preparing carbonate powder from stainless steel smelting waste, which is to carry out online mineral phase reconstruction of stainless steel smelting slag, leaching with metallurgical waste acid solution after cooling, and obtain calcium and magnesium rich solution after filtration, and adjust the pH of the filtrate value, and add a structure-directing agent; pass through the resulting solution containing CO 2 The metallurgical waste gas generates precipitates, and after filtering and drying, calcium carbonate and magnesium carbonate powders with regular shapes and sizes can be obtained in sequence. The invention realizes the on-line ore phase reconstruction of stainless steel slag, enriches a large amount of calcium and magnesium elements in the easily leached phase, and enriches chromium in the spinel phase, greatly improving the stability of stainless steel slag while taking into account the stabilization of chromium. The resource utilization rate is high, and the obtained carbonate powder can be widely used in construction, papermaking, rubber and pharmaceutical industries, realizing "using waste to treat waste and waste to make treasure".

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 Patents(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 LIAONING
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