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<p>Arsenic content poses significant challenges due to its toxicity, complex composition, and the difficulties associated with treatment. Numerous non-ferrous metal smelters currently encounter these issues. This paper presents a novel method for the gradient precipitation of arsenic using a combination of lime, iron salts, and ion exchange processes. The proposed method demonstrates effective arsenic removal, features a straightforward process with minimal slag production, and incurs low treatment costs. Consequently, this method represents a highly promising approach for removing arsenic in industrial applications. The experimental results indicate that one aspect of the lime-iron salt method for arsenic removal involves adjusting the pH level of the contaminated acid to 5.5 by utilizing milk of lime. Following this, hydrogen peroxide is added after introducing ferrous sulfate, and the reaction temperature is maintained at 70°C. The iron-to-arsenic ratio is set at 1.05, resulting in a reduction of arsenic content in the contaminated acid from 10,034&#xa0;mg/L to 900&#xa0;mg/L, achieving an arsenic removal rate of up to 81.4%. The supernatant derived from the lime-iron salt method for arsenic removal was subsequently subjected to an ion exchange process in the second stage. The parameters were carefully controlled, including an adsorption temperature of 20°C, an adsorption duration of 8&#xa0;h, and a concentration of Fe(III) ions &gt; 0.2&#xa0;mol/L. The resin dosage was maintained at a ratio of 8:1. Therefore, the final concentration of arsenic in the wastewater decreased to 18.84&#xa0;mg/L. After utilizing the lime-iron salt-ion exchange method for gradient arsenic deposition, a total arsenic removal rate of 99.5% can be achieved. This is accomplished by adding a small amount of pharmaceutical treatment, allowing the effluent to meet regulatory standards.</p>

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Arsenic-Containing Waste Acid Treatment—Experimental Study on the Removal of Arsenic from Copper Smelting Waste Acid by Lime-Iron Salt-Ion Exchange

  • 期刊论文

  • 发表日期：

    2025年5月16日

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  • JiaChen Sun,
  • DaoFei Zhu,
  • Rui Fang,
  • GuiFang Zhang

摘要

Arsenic content poses significant challenges due to its toxicity, complex composition, and the difficulties associated with treatment. Numerous non-ferrous metal smelters currently encounter these issues. This paper presents a novel method for the gradient precipitation of arsenic using a combination of lime, iron salts, and ion exchange processes. The proposed method demonstrates effective arsenic removal, features a straightforward process with minimal slag production, and incurs low treatment costs. Consequently, this method represents a highly promising approach for removing arsenic in industrial applications. The experimental results indicate that one aspect of the lime-iron salt method for arsenic removal involves adjusting the pH level of the contaminated acid to 5.5 by utilizing milk of lime. Following this, hydrogen peroxide is added after introducing ferrous sulfate, and the reaction temperature is maintained at 70°C. The iron-to-arsenic ratio is set at 1.05, resulting in a reduction of arsenic content in the contaminated acid from 10,034 mg/L to 900 mg/L, achieving an arsenic removal rate of up to 81.4%. The supernatant derived from the lime-iron salt method for arsenic removal was subsequently subjected to an ion exchange process in the second stage. The parameters were carefully controlled, including an adsorption temperature of 20°C, an adsorption duration of 8 h, and a concentration of Fe(III) ions > 0.2 mol/L. The resin dosage was maintained at a ratio of 8:1. Therefore, the final concentration of arsenic in the wastewater decreased to 18.84 mg/L. After utilizing the lime-iron salt-ion exchange method for gradient arsenic deposition, a total arsenic removal rate of 99.5% can be achieved. This is accomplished by adding a small amount of pharmaceutical treatment, allowing the effluent to meet regulatory standards.