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Method for processing smelting waste acid

A technology of polluted acid and raw materials, which is applied in water/sewage treatment, heating water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems that have not been implemented, and achieve efficiency improvement, simple operation, and low treatment cost Effect

Inactive Publication Date: 2016-07-20
NANTONG SUNSHINE GRAPHITE EQUIP TECH
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  • Abstract
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Problems solved by technology

Therefore, the technology of "hydrogen sulfide vulcanization + hot air blowing off" has not been implemented so far

Method used

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  • Method for processing smelting waste acid

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Embodiment Construction

[0022] A method for treating smelting sewage acid, comprising the following steps in sequence:

[0023] (1) Evaporate and concentrate the dirty acid: the raw dirty acid first enters the multi-effect evaporation concentration device, controls the multi-effect evaporation temperature at 105°C-110°C, evaporates most of the water in the dirty acid, and increases the concentration of the dirty acid to 20% -35%; at this time, the arsenic ions and fluorine and chlorine in the dirty acid are not precipitated, and the secondary steam condensate does not contain fluorine and chlorine and can be returned for use.

[0024] (2) Vulcanization: Then use sodium sulfide to vulcanize, clarify, and filter the polluted acid treated in step (1) to remove arsenic and heavy metals; at this time, since the concentration of polluted acid is increased to 20%-35% The efficiency of direct sulfidation is significantly improved, and the arsenic content in the sulfide slag obtained by filtration is relative...

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Abstract

The invention discloses a method for processing smelting waste acid.The method sequentially comprises the steps of evaporation condensation, vulcanization, inversion, crystallization and the like on waste acid.By means of the method, gypsum residues are not produced, that is, secondary pollution is not produced.Multi-effect preconcentration is firstly adopted for the waste acid, 80% or above of water in the waste acid is removed, the steam condensate does not contain fluorine or chlorine and can be circularly used, and sodium sulphide is still adopted to remove arsenic in the waste acid; due to the fact that the concentration of the waste acid is improved to 20-35%, the vulcanization arsenic removing efficiency and the heavy metal removing efficiency are obviously improved, and arsenic can be recycled conveniently; the method has the advantages that investment is small, operation is safe, the processing cost is low, and operation is easy.

Description

technical field [0001] The invention relates to a method for treating smelting sewage acid. Background technique [0002] The flue gas acid production process of copper, lead and zinc smelting produces a large amount of dirty acid containing heavy metals. The conventional treatment method is to add lime to neutralize after sodium sulfide sulfide. Therefore, a large amount of gypsum slag containing heavy metals is produced, and sulfur resources are not utilized. In addition, the treated wastewater contains calcium and sodium ions, which basically cannot be returned to use. In recent years, relevant domestic production enterprises are researching and developing the process technology of "hydrogen sulfide sulfide + hot air blowing off" for sewage acid. Due to the high moisture content of the polluted acid, a large amount of hot air with a temperature of 180°C-200°C is required to blow off the moisture and fluorine and chlorine in the polluted acid. Therefore, the power consu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/001C02F1/04C02F1/66C02F2001/5218
Inventor 冯圣君刘孝平高翔
Owner NANTONG SUNSHINE GRAPHITE EQUIP TECH
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