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Sewage acid treatment method and system

A treatment method and technology for polluted acid, applied in the field of chemical technology, can solve the problems of only focusing on the treatment of polluted acid heavy metals and arsenic, increasing maintenance costs, equipment and pipeline corrosion, etc., achieving simple structure, increasing gas-liquid contact area, reducing The effect of energy consumption

Active Publication Date: 2017-07-25
CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem in the traditional sewage acid treatment method is that it only pays attention to the treatment of heavy metals and arsenic in the sewage acid. The sewage acid after the impurity removal treatment contains high concentrations of F and Cl ions. Direct reuse will cause corrosion of equipment and pipelines, increasing Later maintenance cost

Method used

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  • Sewage acid treatment method and system

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Effect test

Embodiment 1

[0042] A treatment method for polluted acid, comprising the following steps:

[0043] (1) Take polluted acid wastewater, and detect that the mass fraction of sulfuric acid in the wastewater is 10%, the concentration of chloride ions is 2000mg / L, and the concentration of fluoride ions is 2000mg / L.

[0044] (2) Filter the polluted acid through a fiber bundle (pore size 50 μm) made of polypropylene (pp) to obtain a supernatant.

[0045] (3) Take part of the low-temperature flue gas (temperature is about 115°C, similar to air) in the electrolysis stage of non-ferrous metal smelting and exchange heat with the supernatant in the heat exchanger (the low-temperature flue gas and the supernatant do not contact each other), The supernatant was prewarmed to 60°C.

[0046] (4) The preheated low-temperature flue gas is dried in a gas drying tower until the water content is less than 20mg / Nm 3 . The temperature of the dried low-temperature flue gas is about 105° C.; under this temperature ...

Embodiment 2

[0050] see figure 1 and figure 2 , a dirty acid wastewater treatment system of the present invention, comprising an acid filter 1, a heat exchanger 2, a gas drying tower 3, a purging reaction tower 4 and a tail gas absorption tower 5, the liquid inlet of the heat exchanger 2 and the acid filter The device 1 is communicated, the liquid outlet is communicated with the liquid inlet 412 of the purging reaction tower 4, the gas outlet of the heat exchanger 2 is communicated with the air inlet 411 of the purging reaction tower 4 through the gas drying tower 3, and the purging reaction tower 4 The air inlet 411 is located below the liquid inlet 412 of the purging reaction tower 4, and the gas outlet 415 of the purging reaction tower 4 communicates with the tail gas absorption tower 5. Wherein the gas flow pipelines of heat exchanger 2, gas drying tower 3, purge reaction tower 4, and tail gas absorption tower 5 are connected in sequence to form gas flow channels; the liquid flow pip...

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Abstract

The invention discloses a treatment method and system for polluted acid, belonging to the technical field of chemical technology, wherein the treatment method comprises the following steps: separating the solid and liquid from polluted acid wastewater to obtain a supernatant; preheating the supernatant to 50° C. 60°C; the low-temperature flue gas is passed into the preheated supernatant for contact reaction, so that the fluoride ions and chloride ions in the supernatant become HF and HCL, and are discharged with the low-temperature flue gas. Its system includes acid filter, heat exchanger, gas drying tower, purging reaction tower and tail gas absorption tower. The liquid inlet of the heat exchanger is connected with the acid filter, and the liquid outlet is connected with the liquid inlet of the reaction tower. The gas outlet of the heater communicates with the inlet of the purging reaction tower through the gas drying tower, the inlet of the purging reaction tower is located below the liquid inlet of the reaction tower, and the gas outlet of the purging reaction tower communicates with the tail gas absorption tower. The invention utilizes low-temperature flue gas to realize the removal of fluorine and chloride ions from polluted acid, and has the advantages of energy saving, environmental protection, low carbon and the like.

Description

technical field [0001] The invention relates to the technical field of chemical technology, in particular to a method and system for treating dirty acid. Background technique [0002] In the process of non-ferrous smelting, flue gas containing high concentration of sulfur dioxide is usually used to prepare sulfuric acid. In the process of acid production, the components such as dust and acid mist contained in the flue gas must be sprayed with water or pickling in the purification stage to achieve The purpose of dust removal, cooling and removal of acid mist and other impurities is to meet the normal production of sulfuric acid. The smelting sewage acid produced has complex components and high concentration, and contains Cu, Pb, Cd, Zn and other heavy metal impurities as well as high concentrations of F, Cl, As and other harmful substances. Direct discharge without treatment will cause great harm to the environment. [0003] The hazards of fluorine and chloride ions in sewag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F103/16C02F101/12C02F101/14
CPCC02F1/00C02F1/001C02F1/16C02F1/44C02F9/00C02F2101/12C02F2101/14C02F2103/16
Inventor 蒋晓云何劲松毛世超易亚男
Owner CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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