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Arsenic-containing waste acid low-cost harmless treatment method

A harmless treatment, low-cost technology, applied in metallurgical wastewater treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of low efficiency, high cost, difficult treatment, etc., and achieve simple process and low cost Low, good effect

Inactive Publication Date: 2019-02-22
紫金铜业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a low-cost harmless treatment method for arsenic-containing waste acid, which can solve the problems of high cost, low efficiency and difficult treatment of arsenic in the current waste acid treatment process. Form a simple, safe, environmentally friendly, and low-cost harmless disposal process for arsenic-containing waste acid

Method used

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Examples

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Effect test

Embodiment 1

[0038] Finely grind copper smelting slag to 325 mesh P 70 , After magnetic separation by a 120mT magnetic separator, the magnetic separation concentrate is obtained. Add the magnetic separation concentrate to the arsenic-containing waste acid with a sulfuric acid concentration of 70g / L and arsenic content of 15g / L. The liquid-solid ratio (L / g) is 8:1. The liquid is separated to obtain leaching residue and leaching liquid. After mixing the leaching residue with industrial water at a ratio of 1:1, filter and wash repeatedly for 4 times, and obtain the washing residue and washing water after solid-liquid separation. Wash water is pumped into the leaching solution. Add 10g / L hydrogen peroxide to the leaching solution mixed with washing water for oxidation, then add arsenic-fixing additive polymeric ferric sulfate, the initial iron-arsenic mass concentration ratio is 1.5, and add neutralizing agent calcium hydroxide at 90°C The arsenic precipitation is carried out by stirring, t...

Embodiment 2

[0040] Finely grind copper smelting slag to 200 mesh P 85 , after magnetic separation by 100mT magnetic separator, the magnetic separation concentrate is obtained. Add the magnetic separation concentrate to the arsenic-containing waste acid with a sulfuric acid concentration of 80g / L and arsenic content of 12g / L. The liquid-solid ratio (L / g) is 7:1. separate. After the leaching residue is mixed with industrial water at a ratio of 1:1, it is filtered and washed 4 times repeatedly, the solid and liquid are separated, and the washing water is pumped into the leaching liquid for treatment. Add 9g / L hydrogen peroxide to the leachate mixed with washing water for oxidation, then add arsenic-fixing additive polymerized ferric chloride sulfate, the initial iron-arsenic mass concentration ratio is 1.5, and add calcium oxide to stir at 90°C Arsenic precipitation, the arsenic precipitation time is 2 hours, the end point pH is 8, and the arsenic-removing liquid and arsenic-fixed residue ...

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Abstract

The invention discloses an arsenic-containing waste acid low-cost harmless treatment method comprising the following steps: the step S1 of finely grinding copper smelting slag and then performing magnetic separation to obtain tailings and magnetic concentrate; the step S2 of adding the magnetic concentrate obtained in the step S1 as an arsenic-fixing agent to arsenic-containing waste acid for stirring and leaching and then conducting solid-liquid separation to obtain a leaching solution and leaching slag; the step S3 of adding industrial water to the leaching slag obtained in the step S2 for washing, pumping washing water obtained into the leaching solution obtained in the step S2 and returning obtained washing slag to a copper smelting slag field; the step S4 of adding an oxidizing agentto the leaching solution with the pumped washing water obtained in the step S3 to obtain an oxidizing solution; the step S5 of adding a neutralizing agent and an arsenic-fixing aid to the oxidizing solution obtained in the step S4 to carry out arsenic precipitation and then conducting solid-liquid separation to obtain arsenic-fixing slag and an arsenic removal solution. The method has simple process, low cost, good effect and good economic and environmental benefits.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a low-cost and harmless disposal method for arsenic in arsenic-containing waste acid. Background technique [0002] Arsenic (As) widely exists in nature and is a highly toxic carcinogen. With the increasing development of petroleum, pesticide, mining, metallurgy and other industries, the discharge and pollution of arsenic-containing wastewater will definitely affect people's daily life. According to the regulations on the maximum allowable concentration discharge of the first type of pollutants in the "Integrated Wastewater Discharge Standard", the maximum discharge concentration of arsenic needs to be controlled below 0.5mg / L. Therefore, it is imminent to solve the pollution problem of arsenic-containing wastewater. Reducing the cost of arsenic-containing wastewater treatment and developing economical, effective and environmentally friendly arsenic removal technologies are t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C22B30/04B03C1/02C02F101/10C02F101/20C02F103/16
CPCB03C1/02C02F1/00C02F1/66C02F1/72C02F1/722C02F1/78C02F9/00C02F2001/007C02F2101/103C02F2101/20C02F2103/16C22B30/04Y02P10/20
Inventor 林泓富陈杭王俊娥衷水平吴星琳吴健辉李涛张焕然郑佳翔
Owner 紫金铜业有限公司
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