Method for preparing calcium-based cyclic carbon capture material from steel slag

A carbon material and steel slag technology, applied in separation methods, chemical instruments and methods, and other chemical processes, can solve problems such as high cost, limited adsorption capacity, and long preparation process, and achieve strong cyclic adsorption capacity and high resource utilization , The effect of strong regeneration ability

Pending Publication Date: 2022-08-02
NORTHEASTERN UNIV
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  • Description
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Problems solved by technology

At present, the calcium-based cyclic carbon capture materials prepared by using steel slag still face problems such as poor cycle adsorption stability and serious high-temperature sintering.
[0004] Patent CN 113856617 A invented calcium-based CO2 by sol-gel method using calcium salt and citric acid as raw materials and metakaolin as dopant 2 Adsorbent method, the method produced calcium-based CO 2 The adsorbent has large adsorption capacity and good cycle stability, but the preparation process of this method is long and the process is complicated; patent CN 104307463 B invented calcium oxide powder as raw material, activated zeolite and alumina powder as dopants, through chemical modification Ca-based CO 2 Adsorbent, but the cost of the dopant (zeolite, aluminum oxide) used in this method is relatively high, which is not conducive to industrialization; patent CN 107376826B invented a structure stabilizing aid A and CaO loaded on the carrier M by a step-by-step impregnation method , so as to obtain calcium oxide-based high-temperature CO 2 sorbent method, the sorbent CO 2 The cycle adsorption performance is high, but the mass fraction of active CaO in this method is less than 60%, CO 2 The adsorption capacity is limited, which is not conducive to the treatment of bulk industrial waste gas

Method used

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  • Method for preparing calcium-based cyclic carbon capture material from steel slag
  • Method for preparing calcium-based cyclic carbon capture material from steel slag
  • Method for preparing calcium-based cyclic carbon capture material from steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Step 1: in the process of producing slag by smelting the chromium-containing steel slag, add pyrolusite with a mass of 6% of the steel slag, and cool it to 20° C. after the slag is finished.

[0055] Step 2: Crushing and ball milling the modified steel slag in a crusher and a ball mill, screening the steel slag with a 200-mesh sieve, and weighing 200 g of the steel slag under the 200-mesh sieve as a raw material. Add NH with a volume of 1.5L and a concentration of 2mol / L 4 Cl solution ammonium immersion, the ammonium immersion time is 2.5h, the ammonium immersion temperature is 40°C, the stirring rate is 400rpm, the ultrasonic oscillation power is 300W, and the ultrasonic frequency is 20KHz. After leaching, filter to obtain calcium and magnesium rich filtrate.

[0056] Step 3: Add (NH) with a concentration of 2 mol / L to the filtrate of step 2 4 ) 2 CO 3 solution and added NH 4 The pH value of the OH-adjusted solution was 9.8, the stirring rate was 400 rpm, the reac...

Embodiment 2

[0061] Step 1: In the process of producing slag by smelting the chromium-containing steel slag, add pyrolusite with a mass of 7% of the steel slag and 7% of magnesia brick waste, and cool it to 35°C after the slag is discharged.

[0062] Step 2: crush and ball mill the modified steel slag in a crusher and a ball mill, screen the steel slag with a 200-mesh sieve, and weigh 100 g of the steel slag under the 200-mesh sieve as a raw material. Add NH with a volume of 1.5L and a concentration of 1.5mol / L 4 NO 3 The solution was immersed in ammonium, the ammonium immersion time was 1h, the ammonium immersion temperature was 50°C, the stirring rate was 500rpm, the ultrasonic oscillation power was 300W, and the ultrasonic frequency was 20KHz. After leaching, filter to obtain calcium and magnesium rich filtrate.

[0063] Step 3: Add NH with a concentration of 1 mol / L to the filtrate of step 2 4 HCO 3 solution and added NH 4 OH adjusts the pH value of the solution to 10, the stirrin...

Embodiment 3

[0068] Step 1: in the process of producing slag by smelting the chromium-containing steel slag, add high alumina brick waste with a mass of 10% of the steel slag, and cool it to 50°C after the slag is finished.

[0069] Step 2: crush and ball mill the modified steel slag in a crusher and a ball mill, screen the steel slag with a 200-mesh sieve, and weigh 100 g of the steel slag under the 200-mesh sieve as a raw material. Add CH with a volume of 800 mL and a concentration of 3 mol / L 3 COONH 4 The solution was immersed in ammonium, the ammonium immersion time was 3h, the ammonium immersion temperature was 65°C, the stirring rate was 400rpm, the ultrasonic oscillation power was 400W, and the ultrasonic frequency was 25KHz. After leaching, filter to obtain calcium and magnesium rich filtrate.

[0070] Step 3: Add NH with a concentration of 2 mol / L to the filtrate of step 2 4 HCO 3 solution and added NH 4 The pH value of the OH-adjusted solution was 8.9, the stirring rate was ...

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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 a calcium-based cyclic carbon capture material from steel slag. The method comprises the following steps: modifying steel slag in a steel smelting deslagging process, leaching by using an ammonium salt solution, filtering to obtain a solution containing calcium and magnesium elements, adding a precipitator and a pH regulator into the solution, adjusting the pH value of the solution to obtain a mixed solution containing precipitates, aging the mixed solution at room temperature, filtering, washing, and drying to obtain the calcium-magnesium-calcium-magnesium-calcium-magnesium-calcium-magnesium-calcium-magnesium-calcium-magnesium-calcium-magnesium-calcium-magnesium-calcium-magnesium-calcium-magnesium-calcium-magnesium-calcium-magnesium- and drying and calcining the precipitate to obtain the calcium-based cyclic carbon capture material. The metallurgical waste slag and steel slag are used as raw materials, the preparation method is simple and high in operability, and the obtained calcium-based cyclic carbon capture material is large in CO2 adsorption capacity, high in adsorption stability and high in reproducibility and can be used for circularly capturing CO2-containing waste gas discharged by the iron and steel industry, and cooperative treatment of the steel slag and metallurgical waste gas is achieved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of metallurgical resources, and particularly relates to a method for preparing calcium-based circulating carbon capture materials by utilizing steel slag. Background technique [0002] In 2021, my country's crude steel output will account for more than 50% of the world's total, about 1.03 billion tons, and about 0.15 tons of steel slag and about 1.9 tons of CO will be produced for every ton of crude steel produced. 2 emission. For a long time, scholars at home and abroad have carried out a lot of research on the comprehensive utilization of steel slag, developed a series of products such as steel slag powder, steel slag roadbed and pavement aggregate, and steel slag bricks, and formulated corresponding standards and specifications. However, the current comprehensive utilization rate of steel slag in my country is always low, about 30%. The accumulation of a large amount of stee...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01J20/30B01D53/02
CPCB01J20/041B01J20/103B01J20/08B01J20/06B01D53/02B01D2257/504Y02C20/40
Inventor 赵青李宇蒙梅孝辉成宗佑刘承军姜茂发
Owner NORTHEASTERN UNIV
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