A method for recycling aluminum and heavy metals in electroplating sludge
A technology for electroplating sludge and heavy metals, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of low product purity, low selectivity of heavy metal ions, high price, etc. High, significant environmental benefits, and simple methods
Active Publication Date: 2021-04-16
NORTHEAST NORMAL UNIVERSITY
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Problems solved by technology
Such resins currently on the market are expensive, and have low selectivity to heavy metal ions, and are prone to chelate with multiple metal ions in the aforementioned extractant, resulting in low purity of the final product obtained.
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[0042] Specific embodiments of the present invention will be described in detail below for further understanding of the present invention.
[0043] (1) Electroplating sludge
[0044] Electroplating sludge is taken from an electroplating workshop in Changchun City. It is aluminum-containing sludge produced after polyaluminum chloride treatment. Its composition is as follows: Cu 28.7wt.%, Al 13.3wt.%, Ca 2.4wt.%.
[0045] (2) Pretreatment of electroplating sludge
[0046] After the sludge is filtered by plate and frame, the water content is 51.8%. According to the volume ratio of electroplating sludge and acid solution is 1, the electroplating sludge is dissolved in 2M nitric acid solution, and continuously stirred at 120rpm for 6h; according to the volume ratio of 1. Add electroplating sludge again and continue to stir for 6 hours; stop stirring when the pH of the solution is 0.1, and let it stand for 5 hours; collect the solution and record it as solution A.
[0047] (3) Ing...
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The invention discloses a method for recovering aluminum and heavy metals in electroplating sludge, which comprises the following steps: (1) pretreatment of electroplating sludge: dehydrating the collected electroplating sludge by pressure filtration, adding acid solution, mixing and stirring, collecting Solution, recorded as liquid A; (2) mixing ingredients: add ingredients to liquid A to obtain liquid B; (3) recovery of aluminum: transfer liquid B to a reaction kettle, heat up to 250-450°C, and keep the temperature constant for 16-48h , collect the supernatant, record it as liquid C, precipitate it in drying, and obtain boehmite crystals; (4) recovery of heavy metals: use sodium hydroxide, sodium oxalate or sodium carbonate to adjust the pH of liquid C to 4-10, and after standing , collect the supernatant, record it as solution D, collect the precipitate and dry it to obtain heavy metal elements. The invention can effectively separate the impurity Al in the electroplating waste mud, meanwhile, the recovery rate of heavy metal ions is high, and can be converted into high-purity heavy metal products, thereby realizing resource utilization of the electroplating waste mud.
Description
technical field [0001] The invention relates to the technical field of resourceful electroplating waste sludge treatment, in particular to a method for recycling aluminum and heavy metals in electroplating sludge. Background technique [0002] In the treatment of electroplating wastewater, aluminum-containing flocculants are usually used for coagulation treatment, resulting in waste sludge containing heavy metals, which is a hazardous solid waste under national key control and needs to be sanitized and landfilled after reasonable solidification. [0003] At present, the methods of recycling electroplating waste sludge mainly include the following categories: [0004] (1) Solution extraction method: Use dilute acid solution or special extractant solution to extract target metal ions in electroplating waste sludge. For example, dilute hydrochloric acid is used to extract chromium ions in chromium-containing electroplating waste sludge. The disadvantage is that impurity ions,...
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IPC IPC(8): C22B7/00C22B21/00C02F11/122C02F11/00C02F103/16
CPCC02F11/00C02F11/122C02F2103/16C22B7/006C22B7/007C22B21/0023Y02P10/20
Inventor 霍旸朱遂一曲展苏婷林雪边睿
Owner NORTHEAST NORMAL UNIVERSITY