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Separation and recovery of calcium and iron from low calcium steel slag |
ZHAO Shuhai1,2,3, JIN Yongli1,2,3,4, GUO Jiacheng1, ZHANG Kaixuan1,2,4, JIANG Jintao1,2,4 |
1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Nei Mongol, China; 2. Key Laboratory of Integrated Exploitation of Bayan-Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, Nei Mongol, China; 3. Inner Mongolia Autonomous Region Carbon Neutrality Collaborative Innovation Center, Inner Mongolia University of Science and Technology, Baotou 014010, Nei Mongol, China; 4. Collaborative Innovation Center of Integrated Exploitation of Bayan-Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, Nei Mongol, China |
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Abstract Aiming at the urgent needs for comprehensive utilization of steel slag and emission reduction of CO2 faced by the iron and steel industry of China, calcium ions leaching was studied by choosing low calcium steel slag as raw material and acetic acid as extraction agent. After calcium and iron separation, calcium leaching solution was used to carbonate fixed CO2 to produce light calcium carbonate, and magnetic separation of iron from the leaching slag. By means of ICP, XRD, XRF, TG-DSC and other means, the leaching effect of calcium and iron in steel slag, the magnetic separation effect of leaching slag and the purity of precipitated CaCO3 were characterized. The results show that under the conditions of particle size [58,74] μm, leaching time 1 h, solid-liquid ratio 1∶10, acid concentration 2 mol/L and leaching temperature 40 ℃, the separation effect of calcium and iron is the best. After the leaching solution is modified, simulated flue gas is introduced, and 103.72 kg CO2 can be fixed per ton of converter slag, 240.1 kg CaCO3 can be recovered, and the purity of CaCO3 can reach 98.18%. Under the magnetic field intensity of 0.14 T, the magnetic separation effect of leaching slag is the best. The recovery amount of rich iron minerals can reach 201 kg per ton of steel slag, and the iron grade can also reach 57.3%. Calcium carbonate, a product of carbon fixation, can be used as filler in rubber and plastic industries, and iron rich minerals return to the steel production process, which can provid a reference for the effective utilization of steel slag.
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Received: 19 May 2023
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[1] |
JIANG Y L, TUNG C. Production of artificial aggregates from steel-making slag: Influences of accelerated carbonation during granulation and/or post-curing[J]. Journal of CO2 Utilization, 2020, 36: 135.
|
[2] |
GUO J L, BAO Y P. Steel slag in China: Treatment, recycling, and management[J]. Waste Management, 2018, 78: 318.
|
[3] |
中国废钢铁应用协会. 2009—2016年钢渣的利用率和堆存量[J]. 中国废钢铁,2017(1):47.
|
[4] |
王会刚,彭犇,岳昌盛,等. 钢渣改性研究进展及展望[J]. 环境工程,2020(5):133.
|
[5] |
石建红. 冶金废固钢渣综合利用研究[J]. 节能与环保,2023(4):53.
|
[6] |
上官方钦,刘正东,殷瑞钰.钢铁行业“碳达峰”“碳中和”实施路径研究[J]. 中国冶金,2021,31(9):15.
|
[7] |
何赛, 林路, 刘亚琴, 等. 熔融改质含磷钢渣碳热还原回收有价元素试验[J]. 钢铁,2022,57(6):167.
|
[8] |
甄常亮, 程翠花, 张巧荣, 等. "两步法"重构钢渣物相变化特征及黏度调控机制[J]. 钢铁,2023,58(7):144.
|
[9] |
上官方钦,周继程,王海风,等. 气候变化与钢铁工业脱碳化发展[J]. 钢铁,2021,56(5):1.
|
[10] |
罗银博. 改质钢渣间接碳酸化及铁富集的基础研究[D]. 北京:北京科技大学,2023.
|
[11] |
方佑东,赵帅兵,苏畅,等. 钢渣溶出过程中浸出液pH值变化规律研究[J]. 矿业科学学报,2023,8(4):512.
|
[12] |
李梦豪,刘燕,张廷安. 钢渣中钙元素的浸出试验研究进展[J]. 中国有色冶金,2023,52(1):114.
|
[13] |
张金池,刘贵清,解雪,等. 转炉钢渣弱酸体系高效浸出工艺研究[J]. 中国资源综合利用,2023,41(1):11.
|
[14] |
冉武平,张永太,艾贤臣,等. 工业固体废弃物矿化封存CO2研究综述[J]. 科学技术与工程,2023,23(16):6718.
|
[15] |
陈林. 转炉转炉渣钙基活性组元选择性浸出研究[D]. 昆明:昆明理工大学,2018.
|
[16] |
JO H Y, LEE M G, PARK J W, et al. Preparation of high-purity nano-CaCO3 from steel slag[J]. Energy, 2017, 120(1): 884.
|
[17] |
田思聪. 钢渣制备高效钙基CO2吸附材料用于钢铁行业碳捕集研究[D]. 北京:清华大学,2016.
|
[18] |
TEIR S, ELONEVA S, FOGELHOLM C J, et al. Dissolution of steelmaking slags in acetic acid for precipitated calcium carbonate production[J]. Energy, 2007, 32(4):528.
|
[19] |
SUN Y, YAO M S, ZHANG J P, et al. Indirect CO2 mineral sequestration by steelmaking slag with NH4Cl as leaching solution[J]. Chemical Engineering Journal, 2011, 173(2): 437.
|
[20] |
ELONEVA S, SAID A, FOGELHOLM C J, et al. Preliminary assessment of a method utilizing carbon dioxide and steelmaking slags to produce precipitated calcium carbonate[J]. Applied Energy, 2012, 90(1): 329.
|
[21] |
方冬东. 改性钢渣钙基材料碳捕集特性实验研究[D]. 马鞍山:安徽工业大学,2020.
|
[22] |
KUTUS B, GACSI A, PALLAGI A, et al. A comprehensive study on the dominant formation of the dissolved Ca(OH)2(aq) in strongly alkaline solutions saturated by Ca(II)[J]. RSC Advances, 2016, 6(51): 45231.
|
[23] |
BOCLAIR J W, BRATERMAN P S. Layered double hydroxide stability. 1. Relative stabilities of layered double hydroxides and their simple counterparts[J].Chemistry of Materials, 1999, 11(2): 298.
|
[24] |
PELIGRO F R, PAVLOVIC I, ROJAS R, et al. Removal of heavy metals from simulated wastewater by in situ formation of layered double hydroxides[J]. Chemical Engineering Journal, 2016, 306: 1035.
|
[25] |
SWANSON E J, FRICKER K J, SUN M, et al. Directed precipitation of hydrated and anhydrous magnesium carbonates for carbon storage[J]. Physical Chemistry Chemical Physics, 2014, 16(42): 23440.
|
[26] |
朱蓓蓉,杨全兵. 利用转炉渣固结CO2制备沉淀碳酸钙的试验研究[J]. 建筑材料学报,2011,14(4):560.
|
[27] |
唐海燕,孟文佳,孙绍恒,等. 炼钢炉渣的浸出和碳酸化[J]. 北京科技大学学报,2014,36(增刊1):27.
|
|
|
|