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Method for treating heavy-metal contaminated acid wastewater

A technology of polluted acid wastewater and treatment method, applied in water/sewage treatment, water/sludge/sewage treatment, gas treatment, etc., can solve the problems of increasing the output of dangerous solid waste, increasing the treatment cost, slowing down the reaction, etc. Significant resource benefits, low-cost treatment, and economic burden reduction effects

Inactive Publication Date: 2019-02-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method will produce a large amount of neutralization slag such as iron sulfate, which will increase the output of hazardous solid waste, and the acid solution immersed in this process will be recycled as the reaction progresses, and the acid concentration will become thinner, which will slow down or make the reaction impossible. Therefore, acid solution needs to be added again, and a large amount of acid solution increases the processing cost

Method used

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  • Method for treating heavy-metal contaminated acid wastewater
  • Method for treating heavy-metal contaminated acid wastewater
  • Method for treating heavy-metal contaminated acid wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Using the purified sulfur dioxide flue gas in the lead smelting flue gas acid production process as raw material, using H 2 As reducing agent, Co-Mo / Al 2 o 3 As a catalyst, at a temperature of 300°C, V (H 2 ): V(SO 2 ) = 3 to carry out the catalytic reduction reaction to obtain reduced sulfur products containing hydrogen sulfide and the like. The product hydrogen sulfide is introduced into the polluted acid with arsenic concentration of 10000 mg / L at the introduction amount of 1ml / s to carry out the sulfidation reaction. The oxidation-reduction potential of the sulfidation reaction is 50mV, and the arsenic sulfide slag and heavy metal sulfide slag precipitate obtained after the reaction are filtered and recovered.

[0027] From figure 2 It can be seen that H 2 Reduction method to Co-Mo / Al 2 o 3 When used as a catalyst, SO 2 The removal rate is 98%, and the sulfide yield is 88%, which shows that this method can produce a large amount of sulfide to treat dirty ac...

Embodiment 2

[0031] Using the purified sulfur dioxide flue gas in the pyrite flue gas acid production process as raw material, using H 2 As reducing agent, NiO / r-Al 2 o 3 (r-Al loaded with NiO 2 o 3 ) as the catalyst, at a temperature of 320°C, V(H 2 ): V(SO 2 ) = 2 to carry out catalytic reduction reaction to obtain reduced sulfur products containing hydrogen sulfide and the like. The product hydrogen sulfide is introduced into the polluted acid with arsenic concentration of 9000mg / L at an introduction rate of 1.5ml / s for sulfidation reaction. The oxidation-reduction potential of the sulfidation reaction is controlled to be 20mV, and the arsenic sulfide slag and heavy metal sulfide slag precipitates obtained after the reaction are screened and recovered.

[0032] From figure 2 It can be seen that H 2 Reduction method to NiO / r-Al 2 o 3 When used as a catalyst, SO 2 The removal rate is 98%, and the sulfide yield is 68%, which shows that this method can produce a large amount of s...

Embodiment 3

[0036] Using the purified sulfur dioxide flue gas in the copper smelting flue gas acid production process as raw material, CH 4 As a reducing agent, with Cu-doped Ce(La)Ox as a catalyst, at a temperature of 675 °C, V(H 2 ): V(SO 2 ) = 2 to carry out catalytic reduction reaction to obtain reduced sulfur products containing hydrogen sulfide and the like. The product hydrogen sulfide is introduced into the polluted acid with arsenic concentration of 15000mg / L at an introduction amount of 2ml / s for sulfidation reaction. The oxidation-reduction potential of the sulfidation reaction is 60mV, and the arsenic sulfide slag and the heavy metal sulfide slag precipitate obtained after the reaction are filtered and recovered.

[0037] From image 3 It can be seen that CH 4 When the reduction method uses Cu / Ni-Ce(La)Ox as a catalyst, SO 2 The removal rate is 100%, and the sulfide yield is 83%, which shows that this method can produce a large amount of sulfide to treat dirty acid.

[00...

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Abstract

The invention discloses a method for treating heavy-metal contaminated acid wastewater, and belongs to the technical field of wastewater treatment. The method comprises the steps that sulfur dioxide obtained after flue gas of a smelting furnace is purified and afterwards subjected to catalytic reduction treatment to obtain a sulfur product containing hydrogen sulfide and the like; the sulfur product is introduced into contaminated acid and has a sulfide precipitation reaction with heavy metal ions and arsenic ions in the contaminated acid; a contaminated acid solution after the sulfurization reaction is subjected to solid-liquid separation, and obtained products of arsenic sulfide slag and heavy-metal sulfurized slag precipitations are recycled. By means of the method, purification equipment for a process of producing acid by using high-concentration sulfur dioxide flue gas obtained by smelting sulphide ore is relied on, with sulfur dioxide purified after sulfide flue gas acid production as a raw material, the sulfur product is prepared through catalytic reduction to treat the contaminated acid, the contaminated acid generated in the industry can be efficiently treated, and the arsenic sulfide slags can also be recycled; by means of the method, the raw material sulfur dioxide produced in enterprises is utilized for treating the contaminated acid produced in the acid productionprocess of the enterprises, the cost of treating the contaminated acid by the enterprises is reduced, and the method has obvious economic and environmental benefits.

Description

technical field [0001] The invention relates to a treatment method for polluted acid wastewater containing heavy metals, and belongs to the technical field of wastewater treatment. Background technique [0002] The high-concentration sulfur dioxide flue gas produced in the smelting industry can be used to prepare sulfuric acid after purification. During the pickling and purification process of high-sulfur flue gas, a large amount of dirty acid containing heavy metals such as arsenic and lead will be produced. Sewage acid is a kind of acid wastewater containing a large amount of arsenic produced by the acid production process of pyrite ore and smelting flue gas. Such wastewater is often characterized by high acidity and high arsenic content. Its pollution is universal, that is, the main pollutants are heavy metals (arsenic, cadmium, copper, lead, etc.). This type of acidic arsenic-containing wastewater is highly corrosive. On the one hand, it will cause corrosion to pipelin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62B01D53/73B01D53/86B01D53/50C02F101/10C02F101/20
CPCB01D53/73B01D53/8609C02F1/62C02F2101/103C02F2101/20B01D2257/302
Inventor 胡学伟祝传静田森林黄建洪李英杰
Owner KUNMING UNIV OF SCI & TECH
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