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[Chemical Knowledge]：Manufacturing method and process of sulfuric acid

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Manufacturing method
of sulfuric acid
sulfuric acid is an important raw material for chemical production, which is widely used in various fields, such as metallurgy, medicine, pesticide, chemical fertilizer and so on. Therefore, mastering the manufacturing method of sulfuric acid is of great significance to the field of chemical production. This paper will introduce the manufacturing method of sulfuric acid in detail, including raw material preparation, reaction process, post-treatment and product quality control.

1. raw material preparation
The manufacture of
sulfuric acid requires a large amount of raw materials, mainly including pyrite, sulfur, sulfate, etc. Among them, pyrite is the most commonly used raw material, because it contains rich sulfur and iron elements, so it can generate sulfuric acid by roasting reaction. Sulfur is also one of the commonly used raw materials. Sulfur dioxide gas can be generated by burning sulfur, and then further oxidized to generate sulfuric acid.

2. reaction process

1. pyrite roasting reaction

pyrite roasting reaction is one of the core reaction of sulfuric acid manufacturing. During roasting, pyrite reacts with air to produce sulfur dioxide gas and iron oxides. The reaction equation is as follows:

FeS2 + O2 → Fe2O3 +2 + SO2

2. Sulfur dioxide oxidation reaction

sulfur dioxide gas needs to be further oxidized to produce sulfuric acid. In the oxidation reactor, sulfur dioxide gas reacts with oxygen to produce sulfur trioxide gas. The reaction equation is as follows:

2SO2 O2 → 2SO3

3. Sulfur trioxide absorption reaction

sulfur trioxide gas needs to be absorbed with concentrated sulfuric acid to produce sulfuric acid. The reaction equation is as follows:

SO3 + H2O → H2SO4 +

3. post-treatment
The sulfuric acid produced by
needs to be post-treated to ensure that its quality meets the relevant standards. The post-treatment mainly includes the steps of removing impurities and adjusting acidity. Usually, sulfuric acid will contain some impurities, such as iron ions, chloride ions, etc., which need to be removed by adding corresponding reagents. At the same time, it is also necessary to adjust the acidity of sulfuric acid to ensure that it meets the requirements of use.

4. product quality control

In order to ensure the stable and reliable quality of the produced sulfuric acid, it is necessary to carry out comprehensive quality control of the product. Quality control mainly includes the appearance of the product, acidity, impurity content and other indicators to detect. At the same time, it is also necessary to comprehensively monitor the production process to ensure that the various process parameters meet the requirements to avoid quality problems.

In short, the manufacturing method of sulfuric acid involves multiple links and process parameters, and it is necessary to strictly control the operating conditions and raw material quality of each link to ensure the stable and reliable quality of the final product. At the same time, it is also necessary to strengthen the monitoring and management of the production process to improve production efficiency and economic benefits.

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