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Wastewater treatment method for basic zinc carbonate produced by using wet method

A zinc carbonate and alkaline technology, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as slow absorption efficiency, achieve low production cost, reduce environmental pollution, and process simple and easy effects

Inactive Publication Date: 2014-05-07
SHIJIAZHUANG YUANXINGLIANG CHEM TECH
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Problems solved by technology

However, there is only one ammonia absorption procedure in this method, and the absorption efficiency is slow.

Method used

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  • Wastewater treatment method for basic zinc carbonate produced by using wet method

Examples

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Embodiment 1

[0024] Put 2 cubic meters of ammonium sulfate-containing wastewater discharged from the production of active zinc oxide and basic zinc carbonate, and 3 cubic meters of washed wastewater into the reaction tank, add calcium hydroxide emulsion (milk of lime) and stir evenly, control the pH value to 11, and stir the reaction After the end, use a pump to send it into the deamination tower and use a blower to blow hot air at 60°C to blow out the ammonia. The blown ammonia gas is absorbed in two ways: ① into the absorption tower for roasting section ((ZnCO 3 .2Zn(OH) 2 ) roasting to decompose ZnO+CO 2 ). The released CO 2 Absorb and react with water to obtain carbonated ammonia water (ammonium bicarbonate). The reaction formula is as follows, NH 4 OH+CO 2 =NH 4 HCO 3 . ② Send it to the absorption tower, absorb it with a refined zinc sulfate solution, and spray it with a zinc sulfate solution containing 120 g / L of zinc. Detect the zinc content of the zinc sulfate solution at ...

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Abstract

The invention provides a wastewater treatment method for basic zinc carbonate produced by using a wet method, which has the advantages of high wastewater recycling efficiency, capability of reducing the pollution to the environment, energy saving and consumption reduction. The wastewater treatment method particularly comprises the following steps: (1) adding calcium hydroxide into wastewater of basic zinc carbonate and adjusting the pH to 10-11 to generate ammonia gas; (2) dividing the generated ammonia gas into two parts to be treated: a, introducing one part of the ammonia gas into carbon dioxide and water to be absorbed to generate ammonium hydrogen carbonate, and b, adding a zinc sulfate solution into the other part of the ammonia gas and controlling a ammonia gas rushing amount to obtain a mixed solution.

Description

technical field [0001] The invention relates to a wastewater treatment method for producing basic zinc carbonate by a wet method, in particular to a treatment method for treating wastewater containing ammonium sulfate discharged from the production of active zinc oxide and basic zinc carbonate by an acid method. Background technique [0002] The production of active zinc oxide and basic zinc carbonate by acid method is to leaching secondary zinc oxide or other zinc-containing raw materials with sulfuric acid. The leaching solution is oxidized to remove iron and manganese, and zinc powder is added to replace heavy metals to obtain a refined zinc sulfate solution, and then ammonia water and carbonic acid are added. Ammonium hydrogen reacts to precipitate basic zinc carbonate and ammonium sulfate waste solution, and the precipitated basic zinc carbonate must be washed with water to remove sulfate ions, because the concentration of ammonium sulfate in the ammonium sulfate waste s...

Claims

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Application Information

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IPC IPC(8): C01G9/00C01C1/24C02F1/00
Inventor 赵月华
Owner SHIJIAZHUANG YUANXINGLIANG CHEM TECH
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