Potassium alum, also known as potassium aluminum sulfate, is an important inorganic salt chemical, widely used in papermaking, pharmaceutical, water purification, ceramics and other fields. The following is a manufacturing method of potassium alum:
I. Raw material preparation
1. Sulfuric acid: industrial grade sulfuric acid with a concentration of about 98%.
2. Aluminum hydroxide: aluminum hydroxide powder with high purity.
3. Potassium carbonate: industrial grade potassium carbonate.
2. Manufacturing steps
1. Dissolve aluminum hydroxide: add aluminum hydroxide powder into deionized water, stirring and heating until completely dissolved to make aluminum hydroxide solution.
2. Acid dissolution reaction: Add sulfuric acid into aluminum hydroxide solution slowly, while stirring and controlling the reaction temperature, so that aluminum hydroxide reacts with sulfuric acid to produce aluminum sulfate.
3. Addition of potassium carbonate: Potassium carbonate is added to the reaction solution so that aluminum sulfate reacts with potassium carbonate to form potassium aluminum sulfate and carbon dioxide.
4. Filtration and washing: Remove the impurities in the reaction solution by filtration equipment, and then wash the filter cake for several times to ensure the purity of the product.
5. Drying and Packing: Dry the washed filter cake and then pack it to get the final product of potassium alum.
3. Precautions
1. During the whole production process, the reaction temperature and pH value need to be strictly controlled to ensure the smooth progress of the reaction and the quality of the product.
2. Strict quality control of raw materials is needed to ensure that the purity and quality of raw materials meet the production requirements.
3. In the process of filtration and washing, suitable filtration equipment and washing methods need to be selected to ensure the purity and yield of the product.
The above is one of the manufacturing methods of potassium alum, and the specific production process and equipment may vary according to different manufacturers and process conditions. In the actual production process, it needs to be optimized and adjusted according to the specific conditions.
