Aluminum hydroxide is generally used as a flame retardant additive in industry. However, with the continuous development of science and technology, new water treatment agents continue to bring forth new ones. Some water treatment agents such as polyaluminum chloride, aluminum sulfate, aluminum ferric sulfate are gradually used to treat drinking water purification, sewage treatment, wastewater treatment and water treatment in cities and industries. One of the important raw materials of these water treatment agents is aluminum hydroxide.

        In China, the test standard for aluminum hydroxide is GB / T 4294-2010 aluminum hydroxide, but the standard is mainly formulated for the production of inorganic aluminum salts, flame retardant fillers and special alumina products. Therefore, if it is used as raw material for water treatment agent, it is obvious that the standard is not applicable. Therefore, after comprehensive investigation of various opinions, the state issued Hg / T 5567-2019 aluminum hydroxide for water treatment agent. It can be said that Hg / T 5567-2019, from the professional level, has carried out the specification requirements for various indicators of aluminum hydroxide for water treatment agent, so it is authoritative.

        Requirements for testing items of aluminum hydroxide for water treatment agent

        1. Alumina content detection requirements: ≥ 64.0%
        2. Alumina dissolution rate detection requirements: type I requirements ≥ 95%, type II can not be measured
        3. Water content detection requirements: type I requirements ≤ 12.0%, type II requirements ≤ 6.0%
        4. Total iron content detection requirements ≤ 0.01%
        5. Arsenic content detection requirements: ≤ 0.0002%
        6. Detection requirements of lead content: ≤ 0.001%
        7. Cadmium content detection requirements: ≤ 0.0002%
        8. Mercury content detection requirements: ≤ 0.00002%
        9. Chromium content detection requirements: ≤ 0.001%

        In addition to the above testing requirements, the appearance color of aluminum hydroxide for water treatment agent shall be white or yellowish, and the property shall be powder or sand crystal. Moreover, aluminum hydroxide for water treatment agent belongs to strong acid and alkali corrosive products. We must pay attention to protection whether we are preparing samples or doing testing.
            

                                                                                                                                                                                                                                                             (source: Internet)