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Process for deep purification and recovery of mercury in lead-zinc smelting flue gas

A technology of smelting flue gas and deep purification, applied in chemical instruments and methods, gas treatment, membrane technology, etc., can solve the problems of high operating cost, increased system resistance, and general mercury removal effect of activated carbon adsorption method, and achieve technology saving Transformation costs, meet environmental protection requirements, and the effect of simple and practical process

Active Publication Date: 2019-11-12
湖南株冶环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Potassium iodide method was once applied in Shaoxing Smelter, but it was discontinued due to high operating cost; activated carbon adsorption method has the disadvantages of high operating cost, difficult regeneration, increased system resistance, and general removal effect; Polyton method has been used in Zhuzhou Smelter Group It has been used, but also has the disadvantages of high operating cost and mediocre mercury removal effect

Method used

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  • Process for deep purification and recovery of mercury in lead-zinc smelting flue gas
  • Process for deep purification and recovery of mercury in lead-zinc smelting flue gas

Examples

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Embodiment 1

[0023] A domestic lead smelting furnace flue gas mercury removal demonstration project, the demonstration project was constructed in early 2108, adopts the mercury deep purification and mercury recovery process in the lead-zinc smelting flue gas of the present invention, including the following steps:

[0024] Step 1: Turn on the dispensing tank to stir, weigh the KH powder material and pure water to make a KH slurry with a concentration of 40% to 60%.

[0025] Step 2: Input the flue gas into the primary mercury removal tower, and then add the prepared KH slurry in the primary mercury removal tower according to the mercury content of the flue gas, the mercury content of the flue gas is the same as the added KH slurry The mass ratio is 1:10, the automatic dosing device is turned on, and the KH slurry is fed into the tower at a uniform speed. It is best to add KH slurry when the temperature of the flue gas is in the range of 100°C to 300°C, so as to enhance the activity of the K...

Embodiment 2

[0032] This process is used to treat flue gas from a zinc smelting company in China. The company originally used the Polyton method to treat mercury in the flue gas. Later, this process was transformed in another zinc smelting system of the company. The process steps are as follows:

[0033] Step 1: Prepare KH powder material and purified water to make KH slurry with a concentration of 50%.

[0034] Step 2: Input the flue gas into the primary mercury removal tower, and then add the prepared KH slurry in the primary mercury removal tower according to the mercury content of the flue gas, the mercury content of the flue gas is the same as the added KH slurry The mass ratio is 1:10, the automatic dosing device is turned on, and the KH slurry is fed into the tower at a uniform speed.

[0035] Step 3: Input the flue gas after mercury removal in the primary mercury removal tower to the secondary saturated mercury removal tower, add excess KH slurry to the secondary saturated mercury ...

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Abstract

The present invention discloses a process for deep purification and recovery of mercury in lead-zinc smelting flue gas. According to the process, a macromolecule nanometer material demercuration agentKH is adopted and added to a first-class high-efficiency washing demercuration tower and a second-class deep washing demercuration tower, certain process conditions are controlled to realize deep purification of mercury and wash down dust and other heavy metals in flue gas, and then a gas cooling tower, a power wave and an electric demister are used to deeply purify the flue gas. After the flue gas is treated, the Hg content in the flue gas is less than 0.03 mg / Nm<3>, the mercury content in sulfuric acid produced by flue gas is less than 0.0005%. The process meets the requirements of mercuryemission in flue gas, and the recovery rate of mercury in flue gas is 90% or more, and the process has good environmental benefits.

Description

technical field [0001] The invention relates to the field of mercury removal treatment of flue gas from lead-zinc smelting, and specifically relates to a process for treating flue gas from lead-zinc smelting by using KH macromolecule nanomaterial mercury removal agent. Background technique [0002] Mercury removal from flue gas from lead-zinc smelting has always been a major problem in this industry, mainly because the flue gas from lead-zinc smelting has a higher temperature and contains more harmful heavy metal ions, and the discharge standards are strict. The flue gas mercury removal methods used in my country's industry are Polyton chloride method, activated carbon adsorption method, potassium iodide method and so on. Potassium iodide method was once applied in Shaoxing Smelter, but it was discontinued due to high operating cost; activated carbon adsorption method has the disadvantages of high operating cost, difficult regeneration, increased system resistance, and gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/80B01D53/64C22B7/02C22B43/00
CPCB01D53/75B01D53/80B01D53/64C22B7/02C22B43/00B01D2258/0283B01D2257/602
Inventor 李迪汉熊智谭轶中刘卫平王浩宇蒋卫辉黄兴
Owner 湖南株冶环保科技有限公司
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