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Method for recycling red lead process gas

A technology of waste gas circulation and red lead, which is applied in the direction of separation methods, chemical instruments and methods, lead red, etc., can solve the problems that affect people's living environment and health, cannot meet the demand for lead material oxidation, and consume large energy, and achieve protection Good health, reduced energy consumption, and reduced production costs

Active Publication Date: 2017-06-20
安徽徽能化工科技有限公司
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Problems solved by technology

Disadvantages of the traditional method: due to the high temperature in the roasting chamber and the oxidation chamber, there is insufficient oxygen, which cannot meet the oxidation demand of the lead material. Only by prolonging the oxidation time can the red lead product be obtained. The energy consumption is too large, the production cost is high, and the production efficiency is high. Low
The exhaust gas emitted from the production process of red lead products, even if it meets the national air pollutant comprehensive emission standards, is continuously discharged all year round and accumulates over time, which will harm the environment and ultimately affect people's living environment and physical health

Method used

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Embodiment Construction

[0032]In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0033] A kind of red lead production waste gas recycling method, concrete method is as follows:

[0034] (1) Bag dust removal and cooling

[0035] The exhaust gas in the red lead oxidation furnace is generally around 650°C. Under the action of the centrifugal induced draft fan (mature equipment in the market) (the same below), the exhaust gas is introduced into the bag filter through the first gas pipeline to remove dust and cool down. In the process, about 90% of lead dust particles larger than 0.1 μm in the exhaust gas can settle in the dust collector, and the concentration of lead fume will continue to decrease with the decrease of temperature, but it cannot be completely eradicated;

[0036] (2) Secondary wind "rain curtain filter"

[0037]...

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Abstract

The invention discloses a method for recycling red lead process gas. In a red lead production calcining process, inlet air needs to be heated by an air heater, so in order to protect the air heater and prolong the life of the air heater, the red lead process gas must be subjected to dust removal and filtration; the content of oxygen in the red lead process gas is much lower than the concentration of oxygen in air, so if the purified and filtered process gas is directly heated together with the inlet air and input into an oxidizing furnace, the aim of accelerating oxidization of lead powder cannot be achieved, but the oxidization speed is reduced. Therefore, the input amount of the oxygen needs to be increased at the air inlet end to make the oxygen enter the air heater together with the process gas and the air, so the process gas can be recycled without discharge, and quick oxidization can be achieved to improve the production efficiency.

Description

technical field [0001] The invention relates to the technical field of gas treatment, in particular to a method for recycling waste gas from production of red lead. Background technique [0002] At present, the industrial production method of red lead at home and abroad is mainly to heat and melt the electrolytic lead, then ball mill and pulverize it, and then undergo natural roasting and oxidation at a temperature of 300°C to generate PBO, and then undergo natural oxidation at a high temperature of 500°C to obtain Pb 3 o 4 That is, red lead products, even the most advanced "dry and wet new process" to produce red lead, have to go through the stages of roasting and calcination. Disadvantages of the traditional method: due to the high temperature in the roasting chamber and the oxidation chamber, there is insufficient oxygen, which cannot meet the oxidation demand of the lead material. Only by prolonging the oxidation time can the red lead product be obtained. The energy con...

Claims

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Application Information

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IPC IPC(8): B01D50/00C01G21/10
CPCC01G21/10B01D50/60
Inventor 徐志强朱管义李自明
Owner 安徽徽能化工科技有限公司
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