Preparation method for Fe(OH)3 colloid with negative zeta potential

Abstract

The invention provides a preparation method for Fe(OH)3 colloid with a negative zeta potential. The invention is characterized by comprising the following steps: (1) using electrochemical deaeration equipment as operation equipment; (2) preparing softened water by using a sodium ion exchanger without cations and using the softened water as a water supply for the electrochemical deaeration equipment; (3) using iron as an anode of an electrolytic bath of the electrochemical deaeration equipment and a conventional conductor material as a cathode; (4) allowing Fe2<+> produced after consumption of iron of the anode of the electrolytic bath to combine with OH<-> produced by the cathode so as to generate Fe(OH)2, and dissolving Fe(OH)2 in the softened water to allow oxygen to react so as to produce the Fe(OH)3 colloid with a negative zeta potential. The invention has the advantages of an obvious effect and strong operability.

Description

technical field [0001] The invention relates to a negative zeta potential Fe(OH) 3 Colloid preparation method and its use. Background technique [0002] For a long time, iron must be removed for hot water boiler feed water treatment. The country's current control index for iron content in boiler water is no more than 0.3 mg / L. All boiler water treatment literature addresses the need to remove iron from feedwater before it enters the boiler. According to traditional Guan Nian, Fe(OH) 3 The ξ (zeta) potential of the boiler is positive, and because the surface of the metal wall inside the boiler is ionized in water, the surface of the metal wall on the water side is negatively charged, and the positively charged Fe(OH) 3 When the colloid enters the boiler and adsorbs on the metal wall surface, it will form iron scale and depolarization corrosion will occur at the same time. Based on the above point of view, the traditional electrochemical deaerators will settle or filter the...

AI Technical Summary

Problems solved by technology

According to traditional Guan Nian, Fe(OH) 3 The ξ (zeta) potential of the boiler is positive, and because the surface of the metal wall inside the boiler is ionized in water, the surface of the metal wall on the water side is negatively charged, and the positively charged Fe(OH) 3 When the colloid enters the boiler and adsorbs on the surface of the metal wall, it will form iron scale and depolarization corrosion will occur at the same time. Based on the above point of view, the traditional electrochemical deaerator will settle or filter the electrochemical products and prevent them from entering the boiler.