The invention relates to a technology for purifying water from heavy metal ions using metakaolin-based sorbents.
The method of acid activation of kaolin, in which kaolin is crushed, converted into the form of metakaolin, treated with an acid solution at 90 °C in an ultrasonic chemical reactor in the mode of advanced cavitation at a volume power of ultrasound of 0.8±0.2 W/cm3 for 45-60 minutes. The ultrasonic chemical reactor is supplemented with a circuit for setting the temperature of the suspension for activation of methacaolin and a comparison unit, the second input of which is connected to the output of the suspension thermometer as a negative feedback element, and the output of the comparison unit is connected to the power control circuit of ultrasonic vibrations via a switch. The invention provides for the efficient production of methacaolin with a high specific surface area.