Method for collecting arsenic from smelting flue gas by dry process

A technology for smelting flue gas and dry arsenic recovery, which is applied in chemical instruments and methods, arsenic compounds, arsenic oxide/arsenic hydroxide/oxyacid arsenic, etc. , Increase the difficulty and frequency of internal cleaning and cleaning of the ring cooler, so as to ensure the effect of ensuring no corrosion and stable and good operation.

Inactive Publication Date: 2019-04-02
CINF ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of the annular cooling method is that the gaseous arsenic trioxide will condense at 150-270°C to form glass arsenic. The arsenic trioxide of the glass arsenic structure is a very viscous substance, which will scale in the annular cooler and increase the cleaning of the annular cooler. Difficulty and frequency affect process production
In addition, due to the need to ensure sufficient cooling in the flue gas annular cooler, it is ne

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  • Method for collecting arsenic from smelting flue gas by dry process

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Embodiment 1

[0027] The invention provides a method for collecting arsenic by dry method of smelting flue gas, comprising the following steps:

[0028] (1) Quenching: the arsenic content is 2g / Nm 3 The high-temperature copper smelting flue gas quickly passes through the quencher, and the arsenic-containing high-temperature smelting flue gas is quickly washed and cooled to about 130°C in the quencher. The gas velocity in the quencher is 20m / s, and the residence time does not exceed 0.3s. Indirect cooling, then discharge from the bottom of the quencher into the settler;

[0029] (2) Settlement to collect arsenic: the flue gas quenched in step (1) enters the settler, the temperature of the flue gas is stable at about 120°C, and the white arsenic and smoke dust in the flue gas naturally settle to the bottom of the settler in the settler , the settled flue gas is discharged from the upper flue gas outlet, and the settled arsenic is collected from the outlet at the bottom of the settler;

[00...

Embodiment 2

[0032] The invention provides a method for collecting arsenic by dry method of smelting flue gas, comprising the following steps:

[0033] (1) Quenching: the arsenic content is 1.8g / Nm 3 The high-temperature copper smelting flue gas quickly passes through the quencher, and the arsenic-containing high-temperature smelting flue gas is quickly washed and cooled to about 130°C in the quencher. The gas velocity in the quencher is 30m / s, and the residence time does not exceed 0.3s. Indirect cooling, then discharge from the bottom of the quencher into the settler;

[0034] (2) Settlement to collect arsenic: the flue gas quenched in step (1) enters the settler, the temperature of the flue gas is stable at about 120°C, and the white arsenic and smoke dust in the flue gas naturally settle to the bottom of the settler in the settler , the settled flue gas is discharged from the upper flue gas outlet, and the settled arsenic is collected from the outlet at the bottom of the settler;

[...

Embodiment 3

[0037] The invention provides a method for collecting arsenic by dry method of smelting flue gas, comprising the following steps:

[0038] (1) Quenching: the arsenic content is 2.5g / Nm 3 The high-temperature copper smelting flue gas quickly passes through the quencher, and the arsenic-containing high-temperature smelting flue gas is quickly washed and cooled to about 125°C in the quencher. The gas velocity in the quencher is 30m / s, and the residence time does not exceed 0.3s. Indirect cooling, then discharge from the bottom of the quencher into the settler;

[0039] (2) Sedimentation to collect arsenic: the flue gas that has been quenched in step (1) enters the settler, and the temperature of the flue gas is stable at about 110°C, and the white arsenic and smoke dust in the flue gas naturally settle to the bottom of the settler in the settler , the settled flue gas is discharged from the upper flue gas outlet, and the settled arsenic is collected from the outlet at the bottom...

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Abstract

The invention discloses a method for collecting arsenic from smelting flue gas by a dry process, and belongs to the field of comprehensive recycling of metallurgical waste gas. The method comprises the steps of: 1) quenching: arsenic-containing high-temperature smelting flue gas rapidly passes through a quencher for indirect cooling; 2) settling collection of arsenic: after the quenched flue gas enters a settler, white arsenic and smoke dust in the flue gas in the settler naturally settle to the bottom of the settler, and the flue gas subjected to settling is discharged from an upper flue gasoutlet, and arsenic is collected from an outlet at the bottom of the settler; and 3) electrostatic collection of arsenic: the flue gas discharged from the top of the settler enters an electrostatic demister, a small amount of residual white arsenic and smoke dust in the flue gas is collected, and the collected white arsenic and smoke dust fall into the settler. The method of the invention does notintroduce water into the flue gas, and does not reduce the dew point of the flue gas; the settler can collect dust with dew; no corrosion to equipment and pipelines are ensured; glass arsenic and thelike are prevented from blocking a bag type deduster and causing paralysis of a system; the method is applicable to smelting flue gas under different working conditions through a frequency-conversionfan; and the method can reduce sewage generated by the process.

Description

technical field [0001] The invention belongs to the field of comprehensive recovery and utilization of metallurgical waste gas, and in particular relates to a method for collecting arsenic from smelting flue gas by dry method. Background technique [0002] In the pyrometallurgy of nonferrous metals, due to the high arsenic content in the raw material ores, especially the high arsenic content in gold concentrate, copper concentrate, and lead concentrate, the flue gas after smelting contains a large amount of vaporized arsenic trioxide , has a great influence on the subsequent flue gas treatment. [0003] In the existing production, the traditional methods of collecting arsenic mainly include the following two methods: [0004] One method is quenching. Water is used to directly cool the flue gas to 120°C, so that the arsenic trioxide in the flue gas will condense into a solid phase, and then the arsenic trioxide in the flue gas will be collected by a bag filter. The disadva...

Claims

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Application Information

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IPC IPC(8): C01G28/00
CPCC01G28/005
Inventor 吴桂荣周衍武汤洛
Owner CINF ENG CO LTD
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