Method for removing arsenic from metallurgical off-gas spraying solution through multi-stage serial adsorption

A technology for smelting flue gas and spray liquid, applied in chemical instruments and methods, water/sewage multi-stage treatment, gaseous discharge wastewater treatment, etc., can solve problems such as weak adaptability, high material requirements, obvious advantages and disadvantages, etc. , to achieve a wide range of applications, low equipment requirements, and improve the effect of

Inactive Publication Date: 2018-07-06
CNMC GUANGXI PGMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process uses magnetic adsorbent to remove arsenic, which has high requirements on materials, high cost and poor adaptability
[0003] It can be seen that the currently used arsenic removal methods are uneven, with obvious advantages and disadvantages. It is difficult to achieve arsenic removal effect, investment, operation and environment by using a single method for arsenic removal. Therefore, scientific research on the existing arsenic removal methods Reasonable improvement has important economic and practical significance

Method used

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  • Method for removing arsenic from metallurgical off-gas spraying solution through multi-stage serial adsorption

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Effect test

Embodiment 1

[0037] A method for removing arsenic by multi-stage series adsorption of smelting flue gas spray liquid, comprising the following steps:

[0038] (1) Oxidation: At normal temperature, air is blown into the spray liquid circulation tank, and the stirring speed is 400r / min under the mixer for 30min to obtain material 1;

[0039] (2) Neutralization reaction: lime water is pumped into material 1, and the end point of the reaction is that the pH of the material in the circulating tank is 6.5, and the reaction is stopped to obtain material 2;

[0040] (3) Adsorption-precipitation reaction: Add ferrous salt to material 2, and the reaction time is 30min, so that the mass ratio of Fe / As(Ⅲ,Ⅴ) is 0.85 to obtain material 3, wherein FeSO in ferrous salt 4 ·7H 2 The content of O is 85%, the form is loose, and the color is sky blue;

[0041] (4) Catalytic adsorption: the MnO 2 The powder was added to material 3, and the reaction time was 30 minutes, so that the mass ratio of Mn / As(Ⅲ,Ⅴ) wa...

Embodiment 2

[0044] A method for removing arsenic by multi-stage series adsorption of smelting flue gas spray liquid, comprising the following steps:

[0045] (1) Oxidation: At normal temperature, air is blown into the spray liquid circulation tank, and the stirring speed is 800r / min under the mixer for 60min to obtain material 1;

[0046] (2) Neutralization reaction: lime water is pumped into material 1, and the end point of the reaction is that the material pH in the circulating tank is 7, and the reaction is stopped to obtain material 2;

[0047] (3) Adsorption-precipitation reaction: Add ferrous salt to material 2, and the reaction time is 45min, so that the mass ratio of Fe / As(Ⅲ,Ⅴ) is 0.9 to obtain material 3, wherein FeSO in ferrous salt 4 ·7H 2 The content of O is 87%, the form is loose, and the color is sky blue;

[0048] (4) Catalytic adsorption: the MnO 2The powder was added to material 3, and the reaction time was 45 minutes, so that the mass ratio of Mn / As(Ⅲ,Ⅴ) was 0.35, and...

Embodiment 3

[0051] A method for removing arsenic by multi-stage series adsorption of smelting flue gas spray liquid, comprising the following steps:

[0052] (1) Oxidation: at normal temperature, blow air into the spray liquid circulation tank, and stir for 90 minutes under a mixer with a rotating speed of 1200r / min to obtain material 1;

[0053] (2) Neutralization reaction: lime water is pumped into material 1, and the end point of the reaction is that the material pH in the circulating tank is 7.5, and the reaction is stopped to obtain material 2;

[0054] (3) Adsorption-precipitation reaction: Add ferrous salt to material 2, and the reaction time is 60min, so that the mass ratio of Fe / As(Ⅲ,Ⅴ) is 1.0 to obtain material 3, wherein FeSO in ferrous salt 4 ·7H 2 The content of O is 89%, the form is loose, and the color is sky blue;

[0055] (4) Catalytic adsorption: the MnO 2 The powder was added to material 3, and the reaction time was 60 minutes, so that the mass ratio of Mn / As(Ⅲ,Ⅴ) wa...

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Abstract

The invention relates to a method for removing arsenic from metallurgical off-gas, in particular to a technological method for removing the arsenic from a metallurgical off-gas spraying solution. Themethod comprises the following steps: (1) oxidation; (2) neutralization reaction; (3) adsorption-precipitation reaction; (4) catalytic adsorption; (5) pressure filtration. The method disclosed by theinvention has low requirements on equipment and is low in investment, simple in operation and wide in application range, the arsenic concentration of an off-gas spraying solution can be reduced through the method for removing the arsenic through the multi-stage series adsorption, an arsenic removal effect of off-gas is indirectly increased, the arsenic concentration of the off-gas is smaller than5mg / m<3>, environmental requirements are met, and meanwhile, an arsenic removal rate of the metallurgical off-gas spraying solution is 95 percent or above.

Description

technical field [0001] The invention relates to a method for removing arsenic from smelting flue gas, in particular to a process method for removing arsenic from smelting flue gas spray liquid. Background technique [0002] At present, according to literature reports, arsenic removal technologies at home and abroad include: coagulation method, direct precipitation method, ion exchange method, biological method and so on. Coagulation method is currently the most widely used arsenic removal method in industry and life, but its removal efficiency for As(Ⅴ) is poor. Direct precipitation uses a chemical reaction to convert the arsenic directly into precipitate, which is then removed by filtration. It has obvious advantages in the initial treatment of high-arsenic wastewater in industry, but it is not conducive to the treatment of low-concentration arsenic-containing liquid. The ion exchange method has a large processing capacity and is simple to operate, but it is expensive and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/18
CPCC02F1/001C02F1/281C02F1/58C02F1/66C02F1/74C02F9/00C02F2101/103C02F2103/18
Inventor 林秋萍黄德文张华秋
Owner CNMC GUANGXI PGMA
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