Method for recovering heavy metals in high-chlorine salt and high-acid wastewater

A recovery method and heavy metal technology, applied in chemical instruments and methods, water pollutants, multi-stage water treatment, etc., to achieve the effects of reducing chemicals, improving recovery efficiency, and realizing resource utilization

Inactive Publication Date: 2018-06-22
JIANGSU TIANYING ENVIRONMENTAL PROTECTION ENERGY COMPLETE EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology helps recover valuable resources from industrial wastes by efficiently breaking them down into smaller parts that can be easily separated or recovered separately without affecting their original properties. It prevents harmful substances like mercury emissions during incineration processes while still allowing useful materials such as iron sulfate (iron) to pass through. Additionally, it allows us to reuse this treatment residual material with reduced environmental impact compared to traditional methods used before disposal.

Problems solved by technology

Technologies aiming at reducing environmental pollution caused by harmful or noisy wastes have been developed over time. These technics include advanced techniques such as chemically reactors (CAR) and bioremediation systems. There exist different ways to remove these contaminants effectively while minimizing costs associated with disposal processes like incinerators. Additionally, new sources of heavymetals may also emerged due to increasing production levels during manufacturing operations. Therefore, developing effective solutions towards efficient and economical use of valuable heavy metallic products becomes crucial for sustainability goals worldwide.

Method used

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Embodiment Construction

[0025] The recovery method of heavy metals in high-chloride high-acid wastewater, the specific method is:

[0026] (1) Sulfate separation and recovery of calcium

[0027] Sodium sulfate is added to high-chloride high-acid wastewater to form calcium sulfate precipitates, and the precipitates after solid-liquid separation are washed with water to obtain gypsum.

[0028] The high-chloride high-acid wastewater is waste incineration flue gas elution wastewater, wherein the content of hydrogen chloride (mass ratio) is 7%, the content of sodium and potassium chloride is 15%, the content of calcium chloride is 10%, and the content of calcium chloride, lead and zinc is 4%. %, the content of copper chloride, mercury and zinc is 0.5%, and the content of other metal chlorides (Mn, Cr, Cd, Ni, Fe, Mg, etc.) is 1%.

[0029] The obtained gypsum was cleaned with 6 times the amount of water, and the water content of the cleaned gypsum was 30% after press filtration and dehydration. After the gyp

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Abstract

The invention relates to a method for recovering heavy metals in high-chlorine salt and high-acid wastewater, which belongs to the field of dangerous waste treatment and resource recycling. High-saltand high-acid wastewater undergoes hydrochloric acid resolution, adding medicine precipitation and calcium separation, neutralization and precipitation, acid-adding precipitation and zinc and lead separation, carbonate precipitation, residual heavy metal adsorption by exchange resin and evaporative crystallization, so that salt is obtained, and evaporative cooling water is used for washing metal precipitate sludge. After being treated by the method, wastewater is recycled, heavy metals are separated and recovered, crystallized chlorine salt can be adopted as a material for the chlor-alkali industry, bleaching in printing and dyeing and the like, and resource recycling of the heavy metal in the water is realized.

Description

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Claims

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Application Information

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Owner JIANGSU TIANYING ENVIRONMENTAL PROTECTION ENERGY COMPLETE EQUIP CO LTD
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