Technology Development on Heavy Metal-Contained Sludge Reduction and Resource Recovery on Stainless Steel Cold-Rolled Mixed Sludge

Abstract:

Based on characteristics of stainless steel cold-rolled products pickling wastewater, a new process route with advantages of sludge originally reduction, wastewater two-stage treatment, Heavy metal-contained sludge and calcium-salt sludge separately recovery is developed. As 2 waste-water treatment stations operation results have shown, during the passed 6 years, annual sludge reduction ratios (per tons product) reach 43.64% and 50.29% respectively, realizing 105.6 thousands tons of sludge reduction effect and 68.04 millions CNY economic benefits. After two-stage process treatment, effluent water can reach emission standards steadily, Fe,Cr and Ni total contents in the front-part heavy-metal sludge increase from 10% to 30~40% compared with that of one-stage wastewater traditional treatment process, with dramatically decrease of F and S impurities content, therefore it can be used as ferric-contained sludge; while among the post-part calcium-salt sludge, F and S recovery ratios reach 20~40%, with Fe,Cr and Ni total content falls below 3%, therefore it can be used as fluorgypsum or fluorite. Since this technology fit the trend of hazardous waste original reduction and resource categorized recycle, it has a broad application prospect in stainless steel enterprise.

• Periodical: Applied Mechanics and Materials (Volume 768)
• Pages: 340-349
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.768.340
• Online since: June 2015
• Authors: Lei Shi*
• Keywords: Calcium Salt Sludge, Heavy Metal-Contained Sludge, Sludge Reduction, Stainless Steel Cold-Rolled Mixed Sludge, Two-Stage Process

References

[1] Cao Miao-kang. Technology of Neutral Electrolyte and Pickling Descaling for Stainless Steel Strip[J]. Shanghai Metals, 1998, 20(5): 39-47.

[2] Huang Wan-fu, He Shan-CNY. Treatment and Recycle of Steel-pickling liquid waste[J]. Metallurgical Collections, 2005, 5: 33-36.

[3] Shi Lei, Chen Rong-huan, Wang Ru-yi. Application Prospect of Chromium Sludge Pellet in Iron and Steel Industry[J]. Recycling Research, 2007(1): 33-36.

[4] Liu Chao, Fu Liu-song, Wu Fang-zheng. Study on Emission of Fluoride in Brick-Kiln[J]. Shanghai Environmental Science, 1998, 17(3): 15-17.

[5] Yang Lin-jun, Zhang Yun-xiang, Jin Yi-zhong, et al. Fluoride Pollution and Control of Bricks and Tiles Plant around Hangzhou-Jiaxing-Huzhou Area[J]. Agro-environment and Development, 2002, 3: 28-30.

[6] Zhang Yao. Safety Disposal Technologies Analysis of Ningbo Heavy Metal Sludge[P]. Academic Annual Meeting Symposium of Chinese Society of Environmental Science. 2008, 1273-1277.

[7] Pai-Haung S., Juu-En C., Hsing-Cheng L. et al. Reuse of heavy metal-contained sludge in cement production[J]. Cement and Concrete Research, 2005, 35: 2110-2115.

DOI: 10.1016/j.cemconres.2005.08.006

[8] Wang Liang. Recycling Use of Dust and Chromium contained Sludge from Stainless Steel-maker[D]. Xi'an University of Architecture and Technology Thesis of Master Degree, 2007. 04.

[9] Zhang Fa-hui. Application of Mineralization-Composite in the Shaft-Cement[J]. Guangzhou Chemical Industry, 2008, 36(3): 99-101.

[10] Shi Lei, Chen Ronghuan, Wang Ruyi. Study on metallurgical properties and pellet proportioning technology of stainless cold-rolling sludge[J]. Baosteel Technical Research, 2012, 6(2): 1-5.

[11] Shi Lei, Chen Ronghuan, Wang Ruyi. Two-stage treatment process of pickling wasterwater in the cold-rolling production of stainless steel[J]. Baosteel Technical Research, 2010, 4(2): 16-22.