Dry cycle acid from sulfur-based acid production and sulfur concentrate-based acid production

Hello! The difference in acid concentration in the drying circulation tanks between sulfur-based acid production and sulfur concentrate-based acid production is mainly due to differences in raw materials and production processes. Generally, the acid concentration in sulfur-based acid production is high, as the purity of sulfur is high and less moisture is introduced during the acid production process. When producing acid from sulfur concentrate, however, since the sulfur concentrate contains more impurities and moisture, the concentration of the resulting acid is relatively low. The main difference between 93% acid and 98% acid lies in the purity and concentration of the acid. 98% acid has a higher purity and lower water content than 93% acid; therefore, it performs better in certain chemical processes that require a high concentration of acid. When greater corrosivity or reactivity is needed, 98% acid is usually chosen. 93% acid, due to its lower concentration, may have a wider range of applications and its cost is relatively lower as well. .

The acid concentrations in the drying circulation tanks for sulfur-based acid production and sulfur concentrate-based acid production differ, mainly due to differences in raw materials and processes. 1. Differences in raw materials: Sulfur-based acid production: Sulfur is used as the raw material; upon combustion, it produces sulfur dioxide, which is then converted into sulfur trioxide, ultimately yielding sulfuric acid. This process produces fewer impurities, resulting in sulfuric acid of higher purity. Acid production from sulfur concentrate: Using sulfur concentrate (whose main component is iron sulfide) as raw material, it is burned to produce sulfur dioxide, which is then converted into sulfuric acid. Sulfide concentrate contains many impurities, resulting in sulfuric acid of lower purity. 2. Process differences: Sulfur-based sulfuric acid production: The process is simple and easy to control, and the resulting sulfuric acid has a high concentration, typically 98%. Acid production from sulfur concentrate: The process is complex, there are many impurities, and the concentration of the resulting sulfuric acid is low, usually at 93%. 3. Difference between 93% acid and 98% acid: Concentration – The sulfuric acid concentration is lower in 93% acid, while it is higher in 98% acid. Use: 93% acid: Suitable for applications where a high concentration is not required, such as in fertilizer production. 98% acid: Suitable for applications with high concentration requirements, such as in the chemical and pharmaceutical industries. Corrosivity: 98% acid is more corrosive, requiring higher standards for equipment and operations. In summary, the acid concentration in the drying cycle tanks for sulfur-based acid production and sulfur concentrate-based acid production differs, mainly due to differences in raw materials and processes. 93% acid and 98% acid also differ significantly in concentration, application, and corrosivity.

We use 98% acid in all our systems.

The requirements for process parameters differ slightly, mainly regarding acid mist and moisture. The rest are secondary.

The gas used for drying in sulfur-based acid production is air, while in pyrite-based acid production, it is purified sulfur dioxide flue gas.

The last edit to this post was made by hnfxl689 on 2025-10-17 at 16:38. The flue gas containing sulfurous acids is burned in a sulfur incinerator; after heat transfer in a boiler, the resulting high-temperature dry flue gas is used for acid production. The drying tower is primarily used to dry the supplementary air (to adjust the oxygen-to-sulfur ratio in the air). With relatively low moisture content in the air, 98% concentration is used, which corresponds to the concentration of the absorbed acid, thereby facilitating management； After passing through the boiling furnace, the mineral acid undergoes heat removal, dust collection, and wet purification; the flue gas is nearly wet-saturated. The drying tower is used to dry the flue gas, and using 93% acid is more economical. There are also enterprises that use a single tank for drying and suction ； There are also two absorption towers in a common tank.