Thread Content
It is currently one of the most widely used methods for preparing vanadium catalyst carriers for applications in fine chemical products. It is prepared by using an acid to diatomite ratio of 1:1, adding sulfuric acid or hydrochloric acid and boiling for a certain period of time; this causes impurities such as Al2O3, Fe2O3, CaO, MgO, etc. present in the diatomite to react with the acid and form soluble salts. Subsequent filtration, washing, and drying yield high-quality impure diatomite. As for the type of acid, concentration, amount used, boiling time, temperature, and number of purification steps, these can be determined through experiments based on the intended use, origin, grade of diatomite, impurity content, and type. However, diatomite used as a carrier for vanadium catalysts must be treated with sulfuric acid to prevent the introduction of chloride ions. For other uses, hydrochloric acid can be used. By using such methods to purify diatomite, the SiO2 content can be increased by 20% to 42%, while the contents of Al2O3 and Fe2O3 can be reduced several times; the results of this purification process are very good. However, its disadvantages include high consumption of acid and water for washing, it has a certain impact on the environment, and the costs are relatively high. It is only suitable for producing products with high added value, and not for those with large production volumes and low added value. That is a relatively economical and effective method for purifying diatomite, especially for diatomite with high loss on ignition, yielding the best results. It is the most effective and convenient method for removing organic matter. It can be used independently or in combination with other methods. The calcination temperature is usually 600–8000°C. This method takes advantage of the strengths of the calcination process while overcoming the weakness of the acid leaching method, which features a slow rate of transformation reaction. Sulfuric acid is evenly mixed into diatomite, which is then calcined at a high temperature of 3800°C for 1 hour. After that, it is immersed in water to remove water-soluble iron and aluminum compounds; what remains is high-quality diatomite, which can be turned into fine powder after drying. The drawback of this method is that acid wastewater is generated during leaching, which requires further treatment. Linjiang Xinghui Filter Aid Co., Ltd. is located in the Ma’anshan ore field in the Changbai Mountain area of Jilin Province, which is the largest diatomite deposit in Asia. This ore field has proven industrial reserves of over 600 million tons, making it one of the most promising diatomite deposits in the world for further development. The company mainly provides information on diatomite, food-grade diatomite, calcined diatomite, diatomite filter aids, diatomite manufacturers, and diatomite companies. To learn more about diatomite, please visit our official website at www.china-diatomite.com.cn.