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Magnesium oxide neutralization system and method for acid waste water from smelting flue gas

A technology for acid wastewater and smelting flue gas, applied in the chemical industry, can solve the problems that affect the continuous and stable operation of the acid wastewater treatment system, block the magnesium oxide dosing device, and easily generate new wastes, etc. The effect of reducing neutralization reaction time and stable operation

Active Publication Date: 2020-07-24
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The traditional neutralization method of acidic wastewater from non-ferrous metal smelting flue gas is the lime method. In order to solve the problems of excessive slag production and easy generation of new waste in the lime method, a magnesium oxide neutralization method was developed. During the neutralization process of acid wastewater, magnesium oxide easily absorbs moisture and carbon dioxide in the air, and gradually generates basic magnesium carbonate. At the same time, it is easy to react with water to generate magnesium hydroxide, which causes the magnesium oxide dosing device to block in a short period of time. Even dead, need artificial dredging, affect the continuous and stable operation of the acid wastewater treatment system

Method used

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  • Magnesium oxide neutralization system and method for acid waste water from smelting flue gas

Examples

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Embodiment 1

[0026] Such as figure 1 As shown, a magnesium oxide neutralization system for smelting flue gas acidic acid wastewater includes an acid water buffer tank 1, which is provided with a first liquid level gauge 4, and the bottom of the acid water buffer tank 1 passes through two A group of acid water buffer pumps 2 (one open and one standby) are respectively connected to an inlet of the acid water buffer tank 1 and the injector 14, and the pipeline between the acid water buffer pump 2 and the acid water buffer tank 1 is provided with a first Return valve 3, the first return valve 3 is interlocked with the first liquid level gauge 4, and the outlet of the acid water buffer pump 2 is provided with a flow meter 5; A nitrogen purging device is provided, and the nitrogen purging device includes a nitrogen delivery pipeline 17 provided with an automatic nitrogen valve 18, and a spiral nozzle 16 located in the lower hopper 13. 18 is interlocked with the flow meter 5; the inlet of the l...

Embodiment 2

[0029] In this embodiment, the magnesium oxide neutralization system of acid waste water from smelting flue gas is the same as in Example 1, and it is applied to acid waste water from smelting flue gas during abnormal production (acidity: 61.17-166.38g / L, average acidity 119.27 g / L, flow rate: 20-28m 3 / h, average flow 22m 3In the neutralization of / h), due to the large change in the acidity of the acidic wastewater, by detecting the acidity of the acidic wastewater in the acidic water buffer tank 1, the amount of magnesium oxide added is calculated to be 1566kg / h. The linear relationship of the amount of magnesia feeding determines that the frequency of the second variable frequency motor 11 is 46 Hz, which specifically includes the following steps: opening the automatic feeding valve 7, so that the magnesia solid powder in the magnesia storage tank 6 flows into the feeding storage tank 8 through a soft connection ; Send the acid waste water in the acid water buffer tank 1 i...

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Abstract

The invention discloses a magnesium oxide neutralization system and method for the acid-making acid wastewater of smelting flue gas, and belongs to the technical field of chemical engineering. The system mainly includes an acid water buffer tank, a magnesium oxide storage tank, a charging storage tank, a vertical spiral conveyor, a horizontal spiral conveyor, a hopper, a nitrogen purging device, an ejector and an acid water reaction tank; through the boosting function of the vertical and horizontal spiral conveyors, the nitrogen purging function, and the negative pressure absorbing function ofthe ejector, magnesium oxide powder is conveyed into the ejector, is mixed with the acid wastewater fully, and then enters into the acid water reaction tank. According to the magnesium oxide neutralization system and method, magnesium oxide solid powder is separated at the front end of the ejector, and it is avoided that the acid wastewater enters into the hopper to cause the magnesium oxide powder to be damped to cause blocking; therefore, the continuous and stable operation of the acid wastewater treatment system is ensured.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to wastewater treatment in nonferrous metal smelting, in particular to a magnesium oxide neutralization system and method for acidic wastewater produced from smelting flue gas. Background technique [0002] The traditional neutralization method of acidic wastewater from non-ferrous metal smelting flue gas is the lime method. In order to solve the problems of excessive slag production and easy generation of new waste in the lime method, a magnesium oxide neutralization method was developed. During the neutralization process of acid wastewater, magnesium oxide easily absorbs moisture and carbon dioxide in the air, and gradually generates basic magnesium carbonate. At the same time, it is easy to react with water to generate magnesium hydroxide, which causes the magnesium oxide dosing device to block in a short period of time. Even if it is knotted, it needs to be dredged artifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/66C02F103/16
Inventor 孙治忠路八智方永水贺少方李山东马俊王辉贾小军王超文王程飞刘娜
Owner JINCHUAN GROUP LIMITED
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