Glass-lined Composition Design And Research On Suspension Stability Of Glaze Slurry

Glass lining is an inorganic coating with excellent properties such as abrasion,oxidation,and corrosion resistance,which is widely used in pharmaceutical and chemical industries.The traditional preparation process for glass-lined equipment requires two spray firings,which consumes more energy.To reduce energy consumption,the process is simplified by combining the two firing processes into a single firing process.Firstly,the design and development of a primary glazing powder that combines the adhesion of the base glaze with the corrosion resistance of the top glaze.Then,cerium oxide and bentonite were introduced into the glazing powder to study their effects on the suspension stability of glaze slurry,glass-lined mechanical properties,and corrosion resistance.The main studies are as follows:（1）Design and performance study of primary glass-lined glaze powder.According to the performance characteristics of various glass lining additives,design and calculate the composition and content of primary glass lining glaze powder,and prepare the glass lining specimens.The XRD and FTIR spectra of the glass-lined specimens before and after firing were all Si O₂bun peaks of the amorphous phase and the functional groups of Si-O-Si asymmetric bending vibration and B-O-B stretching vibration of[BO₄]and[BO₃],and the enamel was a borosilicate network.（2）The effect of cerium oxide content on the suspension stability and glass-lined performance of glaze slurry.Cerium oxide improved the suspension stability of glaze slurry,making the absolute value of Zeta potential gradually increased and the settling rate slowed down.In the experimentally selected specimens,the content of 3.0 wt.%,the porosity was the lowest at 10.4%,and the force difference and displacement difference of flexural strength and fracture toughness reached the maximum value of 369 MPa,0.25 k N,and 0.22 mm,respectively.The addition of cerium oxide was beneficial to improve the alkali corrosion resistance of glass lining,but the acid corrosion resistance of glass lining was reduced.（3）The effect of bentonite content on the suspension stability and glass-lined performance of glaze slurry.The addition of bentonite improved the suspension stability of the glaze slurry,making the absolute value of Zeta potential increase and then decrease,and the settling rate slowed down.In the experimentally selected specimens,the content of1.0 wt.%,the porosity was the lowest at 12.9%,and the force difference and displacement difference of flexural strength and fracture toughness reached the maximum value of 403MPa,0.19 k N,and 0.13 mm,respectively.The acid and alkali corrosion resistance of the glass lining would show an increasing trend with the addition of bentonite,showing excellent acid resistance at a content of 0.5 wt.%,compared to the glass lining specimens without bentonite adding corrosion weight loss and corrosion rate decreased by 63.7%and61.7%,respectively;at the content of 2.0 wt.%,the best alkali resistance,compared to the glass lining specimens without bentonite adding corrosion weight loss and corrosion rate decreased by 18.6%,19.5%.（4）Comparison of the effects of superimposed cerium oxide and bentonite on the performance of glass lining.Based on the above experimental results,the comparison of glass-lined glaze pastes revealed that the addition of cerium oxide has a greater effect on the absolute value of the Zeta potential and facilitates the dispersibility of the suspension,while bentonite facilitates the slowing down of the settling rate.By comparing the physicochemical properties of the stacked glass lining,it was found that the flexural strength of the glass lined with 3.0 wt.%cerium oxide was optimal,the fracture toughness of the glass lined with 1.0 wt.%bentonite was optimal,while the alkaline resistance of the glass lined with 1.0 wt.%cerium oxide and 2.0 wt.%bentonite was optimal.The results of the research are important for extending the service life of glass-lined equipment and reducing energy consumption in production.