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High-arsenic-content metallurgical sludge harmless treatment method and arsenic recovery method

A harmless treatment and recovery method technology, applied in the direction of sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem that product stability cannot be well guaranteed, and achieve low cost, Wide application range and high arsenic removal rate

Inactive Publication Date: 2018-10-09
ZHENGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processes mainly fix arsenic in cement, bricks and some polymers, and do not really realize the separation of arsenic from solids. Therefore, in the process of dealing with some high arsenic content, the stability of the product cannot be well guaranteed. has a greater risk

Method used

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  • High-arsenic-content metallurgical sludge harmless treatment method and arsenic recovery method
  • High-arsenic-content metallurgical sludge harmless treatment method and arsenic recovery method
  • High-arsenic-content metallurgical sludge harmless treatment method and arsenic recovery method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] 1 The harmless treatment method of high arsenic-containing metallurgical sludge in this embodiment, such as figure 1 shown, including the following steps:

[0042] 1.1 Pretreatment: Air-dry the arsenic-containing sludge until the moisture content is lower than 15%, and grind it to 100 mesh with a soil ball mill to obtain dried arsenic-containing sludge with a mass fraction of arsenic of 15%;

[0043] 1.2 Separation by adding acid and shaking for the first time: Weigh 4.0g of dried arsenic-containing sludge into a 250mL polytetrafluoroethylene plastic bottle, add 20mL of 10% nitric acid solution, mix well and place in a 20°C In a constant temperature shaker, shake at 120rpm for 24 hours; use a Buchner funnel to filter, and wash the leaching residue 3 times with pure water;

[0044] 1.3 The second acid-adding shock separation: put the cleaned leaching residue in a 250mL polytetrafluoroethylene plastic bottle, add 20mL of 10% nitric acid solution, mix well and place in a ...

Embodiment 2

[0052] 1 The harmless treatment method for high arsenic-containing metallurgical sludge in this embodiment comprises the following steps:

[0053] 1.1 Pretreatment: Air-dry the arsenic-containing sludge until the moisture content is lower than 15%, and grind it to 100 mesh with a soil ball mill to obtain dried arsenic-containing sludge with a mass fraction of arsenic of 15%;

[0054] 1.2 Separation by adding acid and shaking for the first time: Weigh 4.0g of dried arsenic-containing sludge into a 250mL polytetrafluoroethylene plastic bottle, add 30mL of 10% nitric acid solution, mix well and place in a 20°C In a constant temperature shaker, shake at 120rpm for 24 hours; use a Buchner funnel to filter, and wash the leaching residue 3 times with pure water;

[0055] 1.3 The second acid addition and shock separation: put the cleaned leaching residue in a 250mL polytetrafluoroethylene plastic bottle, add 30mL of 10% nitric acid solution, mix well and place in a constant temperatur...

Embodiment 3

[0063] 1 The harmless treatment method for high arsenic-containing metallurgical sludge in this embodiment comprises the following steps:

[0064] 1.1 Pretreatment: Air-dry the arsenic-containing sludge until the moisture content is lower than 15%, and grind it to 100 mesh with a soil ball mill to obtain dried arsenic-containing sludge with a mass fraction of arsenic of 15%;

[0065] 1.2 Separation by adding acid and shaking for the first time: Weigh 4.0g of dried arsenic-containing sludge into a 250mL polytetrafluoroethylene plastic bottle, add 40mL of nitric acid solution with a mass fraction of 20%, mix well and place in a 20°C In a constant temperature shaker, shake at 120rpm for 18h; use a Buchner funnel to filter, and wash the leaching residue with pure water for 3 times;

[0066] 1.3 The second acid-adding shock separation: put the cleaned leaching residue in a 250mL polytetrafluoroethylene plastic bottle, add 40mL of 20% nitric acid solution, mix well and place in a co...

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Abstract

The invention relates to a high-arsenic-content metallurgical sludge harmless treatment method and an arsenic recovery method, and belongs to the technical field of environmental protection. The high-arsenic-content metallurgical sludge harmless treatment method comprises: 1) carrying out harmless treatment on dried arsenic-containing sludge, wherein the harmless treatment comprises: adding a nitric acid solution having a mass fraction of 10-20% to dried arsenic-containing sludge, carrying out a mixing reaction, and carrying out solid-liquid separation to obtain a leaching liquid and leachingresidue; and 2) repeatedly carrying out harmless treatment on the leaching residue 1-3 times. According to the present invention, the used nitric acid solution can be industrial waste acid, such thatthe cost is low; the arsenic removal rate in the sludge is high; and the leaching residue content measured according to the Solid waste-Extraction procedure for leaching toxicity (HJ / T299-2007) is farbelow the Identification standards for hazardous wastes-Identification for extraction toxicity (GB5085.3-2007) standard.

Description

technical field [0001] The invention relates to a harmless treatment method for high arsenic-containing metallurgical sludge and an arsenic recovery method, belonging to the technical field of environmental protection. Background technique [0002] A large amount of arsenic-containing wastewater will be generated in the process of non-ferrous metal smelting, petroleum processing, and chemical product production. In sewage treatment projects, in order to make the discharged water meet the national standard, methods such as neutralization method and precipitation method are generally used for treatment. Lime-iron salt method is a common method for treating non-ferrous smelting production wastewater. The treatment of colored smelting wastewater by lime-iron salt method will produce a large amount of solid arsenic-containing sludge. If not disposed of properly, the relatively water-soluble arsenic acid and arsenite in the sludge will migrate with the water and seep into the sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C22B7/00C22B30/04
CPCC02F11/00C22B7/007C22B30/04Y02P10/20
Inventor 万俊锋尹越王悦铭迟媛媛王岩
Owner ZHENGZHOU UNIV
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