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Method for treating heavy metals before smelting flue gas desulfurization

A technology for smelting flue gas and heavy metals, applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve problems such as high operation difficulty, high arsenic content, bag leakage, etc., achieve simple process, low energy consumption, and reduce desulfurization Effect of energy and desulfurization medium consumption

Active Publication Date: 2021-08-24
封云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the filtration efficiency and corrosion resistance durability of the bag filter, bag filter damage and leakage occur from time to time, which leads to particulate matter in the desulfurization product, such as arsenic, lead, zinc and trace amounts of copper, cadmium, selenium, Tin, antimony, etc. Among them, the content of arsenic is extremely high and the hazard is great, thus turning desulfurization gypsum or desulfurization products into hazardous wastes. Heavy metals in the product, which is difficult and expensive to handle

Method used

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  • Method for treating heavy metals before smelting flue gas desulfurization
  • Method for treating heavy metals before smelting flue gas desulfurization
  • Method for treating heavy metals before smelting flue gas desulfurization

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Experimental program
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Effect test

Embodiment 1

[0023] After bag dust removal and before environmental protection desulfurization, a first-level purification tower and a second-level purification tower are added to treat the heavy metals in the flue gas. The specific steps are as follows:

[0024] (1) First-level spray purification: Pass the flue gas containing heavy metals into the first-level purification tower, and at the same time spray the acid solution into the flue gas through the spray device, so that the flue gas is easily soluble in the Heavy metals from the acid solution are transferred to the spray liquid;

[0025] (2) Secondary spray purification: After the flue gas sprayed by the acid-containing solution is passed from the primary purification tower to the secondary purification tower, it is sprayed with water to rinse the residual acid-containing solution in the flue gas. Simultaneously capture sulfur dioxide and some soluble heavy metals in the flue gas;

[0026] (3) Flue gas discharge: the leached flue gas...

Embodiment 2

[0035] The acid-containing solution is a sulfuric acid solution.

[0036] The volume ratio of the spraying amount of the spraying liquid in step (1) and the spraying amount of the eluent in step (2) to the amount of flue gas is 1:100.

[0037] The inlet temperature of the flue gas in the first-stage purification tower is 110°C, and the outlet temperature of the flue gas is <60°C; the inlet temperature of the flue gas in the second-stage purification tower is less than 60°C, and the outlet temperature of the flue gas is 40°C.

[0038] The single residence time of the spray liquid in the primary purification tower and the single residence time of the eluent in the secondary purification tower are both 16 minutes.

[0039] All the other are with embodiment 1.

Embodiment 3

[0041] The acid-containing solution is hydrochloric acid solution.

[0042] The volume ratio of the spraying amount of spraying liquid in step (1) and the spraying amount of eluent in step (2) to the amount of flue gas is 1:125.

[0043] The inlet temperature of the flue gas in the first-stage purification tower is 150°C, and the outlet temperature of the flue gas is <60°C; the inlet temperature of the flue gas in the second-stage purification tower is less than 60°C, and the outlet temperature of the flue gas is 50°C.

[0044] The single residence time of the spray liquid in the primary purification tower and the single residence time of the eluent in the secondary purification tower are both 20 minutes.

[0045] All the other are with embodiment 1.

[0046] The desulfurization gypsum slag obtained by the traditional flue gas purification method was compared with the desulfurization gypsum slag obtained after the treatment of the present embodiment 1 and the present embodiment...

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Abstract

The invention discloses a method for treating heavy metals before smelting flue gas desulfurization. The method comprises the following steps: spraying and purifying a primary acid solution; performing secondary water spraying purification; discharging flue gas; carrying out first-stage acid supplementing internal circulation spraying; and conducting secondary water internal circulation spraying. According to the method, acid-soluble heavy metal particles or dust and the like in the flue gas can be dissolved in an acid-containing solution to be removed through an acid spraying and water washing method, the heavy metal particles are controlled to be the lowest limit, particularly, the removal rate of arsenic reaches 95% or above, and then the flue gas with heavy metal removed is subjected to desulfurization treatment through a tail-end environment-friendly treatment desulfurization facility. The desulfurization gypsum common solid waste can be realized, so that the heavy metal content of the desulfurization product reaches the expected purpose, and the comprehensive treatment and utilization cost of the desulfurization product is reduced. According to the method, the acid spraying liquid and the water washing liquid are recycled, the process is simple, and the raw material cost input can be effectively reduced while the heavy metals in the flue gas are removed.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a method for treating heavy metals before smelting flue gas desulfurization. Background technique [0002] The flue gas contains toxic and harmful substances such as sulfur dioxide, arsenic and other heavy metal particles, dust, etc. The traditional flue gas purification process is: environmental protection desulfurization after bag dust removal (environmental protection desulfurization mostly uses calcium oxide desulfurization or double alkali (calcium + sodium) desulfurization technology). However, due to the filtration efficiency and corrosion resistance durability of the bag filter, bag filter damage and leakage occur from time to time, which leads to particulate matter in the desulfurization product, such as arsenic, lead, zinc and trace amounts of copper, cadmium, selenium, Tin, antimony, etc. Among them, the content of arsenic is extremely high and ...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/78B01D53/64B01D53/96B01D47/06B01D53/50
CPCB01D53/75B01D53/78B01D53/64B01D53/96B01D47/06B01D53/507B01D2258/0283B01D2251/502B01D2251/506
Inventor 封云
Owner 封云