Method for ferric hydroxide water purifier preparation with sludge after steel pickling waste water lime neutralization

• Main Author: Lu Yuzhu
• Format: Patent
• Language: Chinese; English
• Published: 31.08.2016
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; INORGANIC CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention relates to a method for ferric hydroxide water purifier preparation with sludge after steel pickling waste water lime neutralization, and belongs to the technical field of steel pickling waste water treatment. The method is characterized by adding steel pickling waste acid water into calcium hydroxide solution with a pipeline mixer for mixing, regulating PH=8, subjecting the mixed liquor to filter pressing to obtain deep green sludge 60-70% in moisture content, stirring the sludge, regulating PH=6 with steel pickling waste liquor, and adding industrial sulphuric acid for acidification to obtain a solid ferric hydroxide water purification flocculant product. Or sludge filter cake is subjected to natural drying and oxidation to form brown dried sludge cake 10-20% in moisture content, then the brown dried sludge cake is crushed and stirred with a crusher prior to being diluted with aluminum chloride solution into mud paste, and then the industrial sulphuric acid is added in for acidification to obt