Method for removing lead and zinc from steel rope pickling and phosphating acid waste liquid and its comprehensive utilization
An acid waste liquid, steel rope acid technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. problems, to achieve the effect of moderate operating costs
Inactive Publication Date: 2015-08-12
南通市环境工程设计院有限公司
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Problems solved by technology
Membrane osmosis separation method can recover part of dilute hydrochloric acid under the condition of low investment cost and low operating cost, but the residue still contains a large amount of lead and zinc, which cannot reduce the discharge of waste liquid, and the recovered acid still contains 20-30% of the heavy metal lead is reused in the pickling section, which cannot guarantee the quality of steel wire rope products
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[0028] A method for removing lead and zinc from steel rope pickling and phosphating acidic waste liquid and its comprehensive utilization, comprising the following steps:
[0029] (1) A reducing agent composed of iron filings and / or iron powder is added to the acidic waste liquid of steel rope pickling and phosphating to reduce ferric ions in the acidic waste liquid to ferrous ions:
[0030] (2) Adding an auxiliary agent solution to the acidic waste liquid treated in step (1);
[0031] (3) Add a complex chelating precipitant solution to the liquid phase treated in step (2), and the lead ions in the waste liquid after the reaction form a complex chelated lead precipitate, which is separated by mechanical filtration to obtain the acidic waste liquid after lead removal ;
[0032] (4) Discharge the acid waste liquid treated in step (3) into the three-effect evaporation concentration crystallization device, and use the concentration difference and solubility difference between fer...
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Abstract
The invention discloses a lead and zinc-treatment and comprehensive utilization method of a pickling and phosphorizing acidic waste liquid of a wire cable. The method comprises the following steps: adding a reducer consisting of scrap iron and / or iron powder into the pickling and phosphorizing acidic waste liquid for the wire cable to reduce tervalent ferric ions in the acidic waste liquid to bivalent ferric ions; adding an assistant solution into the acidic waste liquid; adding a compound chelating precipitator solution into a liquid phase, generating a compound chelating lead precipitate by lead ions in the waste liquid after reaction, and mechanically filtering and separating to obtain an acidic waste liquid without lead; discharging the acidic waste liquid into a three-effect evaporation, concentration and crystallization device to obtain a ferrous chloride crystal product by means of differential concentration and solubility among ferrous chloride, lead chloride and zinc chloride by controlling the amount of crystallization mother liquor; and evaporating and condensing collected diluted hydrochloric acid and recycling. The lead ion concentration in the acidic waste liquid of the waste wire cable treated and separated by the compound chelating precipitate is less than or equal to 8mg / L, and the removal rate is respectively greater than or equal to 99.5%. The pickling and phosphorizing acidic waste liquid of the wire cable is recycled.
Description
technical field [0001] The invention relates to a method for removing lead and zinc from steel rope pickling and phosphating acidic waste liquid and comprehensively utilizing it. Background technique [0002] Steel rope enterprises use dilute hydrochloric acid (containing about 20% hydrochloric acid) to clean the rust oxide layer on the surface of round steel wire rods and the surface of steel wire after heat treatment and phosphating treatment. The discharged acidic waste liquid contains heavy metals lead, zinc ions and a large amount of iron Ions, because there is no scientifically feasible and economically reasonable treatment method, seriously pollute the surrounding environment and restrict the development of the steel rope industry. [0003] Add soda lime powder or caustic soda to the acidic waste liquid containing lead and zinc to adjust the pH value to an appropriate range. According to the optimal precipitation pH value of lead and zinc metal ions, the waste acid ca...
Claims
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IPC IPC(8): C02F9/10C01G49/10
Inventor 邹永平丁滨林施正兵季昌桃
Owner 南通市环境工程设计院有限公司