I have a question regarding the purification of sulfuric acid and reducing the generation of contaminated acid
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In the sulfuric acid production process, dry and wet purification methods are employed. Are there any relevant technologies and information available in China to reduce the amount of water used in these purification steps, with the aim of minimizing the generation of waste acid during sulfuric acid production? Beginners would appreciate it if experts could provide some guidance
What is dry purification? Wet purification?
For the production of acid from pyrite and the treatment of wastewater, it is necessary to address the issues at their source. The color of the slag from the boiling furnace should not be too red, in order to reduce the sulfur trioxide content in the furnace gases, and thus decrease the amount of dilute acid produced； Ensure that each electric field in the electrostatic precipitator operates properly, in order to reduce the dust content in the gas entering the purification furnace ； To ensure effective ash removal from the boiler, it is advisable to install a heat pipe economizer after the electrostatic precipitator, in order to reduce the heat carried in the gas entering the purification furnace. These measures are all conducive to reducing the amount of purification make-up water and dilute acid produced. Secondly, the treatment process for purifying dilute acid and slag cooling and humidification are considered together in the design to make full use of the wastewater after neutralization. If investment permits, membrane technology can be used to purify the diluted acid, which can then be added to the system as dry absorption water.
Perhaps I misunderstood or misdescribed it; my understanding is that dry purification refers to electrostatic dust collection, while wet purification involves washing with water or dilute acid
How to control the formation of sulfur trioxide in non-ferrous smelting processes and reduce the moisture content in flue gases
Weak-oxygen roasting involves controlling the oxygen content at the outlet of the fluidized bed furnace; a lower oxygen level results in less oxidation of sulfur dioxide to sulfur trioxide, and thus less acidic mist is generated
The level of impure acid that remains after purification cannot be reduced. This impure acid contains not only dust but also harmful impurities such as arsenic and fluorine. If these are not properly removed, and the acid is concentrated to a certain degree before being sent to subsequent processing stages, the catalysts in the conversion stage can suffer from arsenic poisoning. Fluorine, on its part, can corrode the ceramic rings and drying towers in the adsorption stage