Seek high-temperature and acid-resistant filling materials

Borosilicate glass, quartz glass, graphite. Check the information on sulfuric acid provided earlier in the corrosion data manual; it might help you make your choice.

KPI acid-resistant mortar – Edit the entry; add a new meaning under B. Add a new meaning? Category: Chemicals. This mortar can be widely used in anti-corrosion applications in various industrial sectors such as petroleum, chemicals, metallurgy, power generation, pesticides, food processing, fermentation, hydrolysis, and pickling – in reactors, storage tanks, towers, floors, trenches, electrolytic cells, etc. Basic Information: Chinese name – KPI acid-resistant mortar. Main raw materials: water glass, etc. Features: high mechanical strength and excellent bonding properties. Application areas: petrochemical industry, etc. Table of contents: 1. Main raw materials; 2. Technical requirements; 3. Features; 4. Construction process. Fold to edit this section. Main raw materials: 1. Water glass: The key technical parameters are modulus and density; the appropriate density is 1.35–1.45 g/cm3, which can also be expressed in Baumé degrees. The relationship between the two is density = 145/(145 – Baumé degree) (g/cm3). A more suitable modulus is 2.6 to 3.0; the modulus and density can be adjusted as desired. 2. Sodium fluosilicate: Sodium fluosilicate is a curing agent, with technical specifications requiring a purity of over 95% and a moisture content of less than 1%. 3. Powder material: The powder material serves as the filler for acid-resistant concrete, and its technical specifications are: acid resistance of over 94% ； Moisture content less than 0.5% ； Acid-resistant impurities must not be present ； Fineness of 1600 pores/cm2 with a sieve residue of not more than 5%, and 4900 pores/cm2 with a sieve residue of 10% to 30%. Common powder materials include cast stone powder and quartz powder, or a mixture of the two; for applications requiring high temperature resistance, refractory clay brick powder is used. 4. Aggregates: Aggregates constitute the main framework of acid-resistant concrete, directly affecting its physical and chemical properties as well as its technical specifications. Apart from the fineness, everything else is the same as that of powder materials. The commonly used aggregate is quartz stone (sand); for applications requiring high temperature resistance, crushed refractory clay bricks are used. Coarse and fine aggregates should have a good gradation. 5. Modifiers: The main function of modifiers is to improve density and impermeability; they are important components in modified water glass concrete. Foldable edit Section Technical requirements 1) It should be soluble in water or able to disperse uniformly in sodium silicate solution under vigorous stirring. 2) It will not cause water glass to coagulate or separate. 3) It should have a certain degree of corrosion resistance or polymerize into a solid when exposed to acid. Common modifiers are furan-based organic monomers and furan resins, such as furfural, furfuryl alcohol, or mixtures of furfuryl alcohol and furfural, with a dosage of 1% to 5% (by weight) of the amount of water glass used. II. Technical properties and applications: ‘KPI’ acid- and heat-resistant mortar is a new type of inorganic adhesive composed of potassium silicate as a binder, polymerized phosphate as a curing agent, and silicoaluminate as a corrosion-resistant filler. Compared with ordinary water glass mortar that uses sodium silicate as a binder and sodium fluosilicate as a curing agent, it exhibits outstanding advantages in terms of impermeability, heat resistance, and water resistance. Features of the folded edition: 1. The “KPI” clay possesses high mechanical strength, strong adhesion, and good water resistance. 2. The “KPI” clay exhibits good corrosion resistance to a variety of chemical media, such as inorganic acids (except hydrofluoric acid), oxidizing acids, organic acids, and various organic solvents. 3. The ‘KPI’ mortar uses a non-phosphorus-based, non-toxic curing agent; it is harmless to construction workers and to the materials it comes into contact with, and it does not cause corrosion to the equipment that is lined with it. 4. The ‘KPI’ clay can be applied at room temperature, cures at normal temperatures, and can be used in high-temperature environments. It is simple to apply and easy to use, has a long storage life, and is easy to transport. 5. The clay of 《KPI》 possesses good heat resistance; it can be used at 300°C in certain media, as well as in high-temperature equipment such as flues and furnaces operating at temperatures up to 800–1000°C. Foldable edit section: Construction process. 1. Mixing: First, add the dry materials to the mixer and mix them dry for 2 minutes; then add water glass and modifiers, and mix them wetly for 3 minutes before discharging the mixture. To prevent stalling, the mixing volume should not exceed 40% of the mixer’s capacity. The discharge must be carried out quickly and promptly; if the mixer malfunctions, the material inside it should be removed immediately and washed clean with water. After work each day, the modified concrete inside the machine and on the mixing blades must be cleaned thoroughly. When the volume of work is small, manual mixing can be used. 2. Pouring: Apply a layer of thin mortar on the construction surface; wait for it to cure before pouring, and try to avoid leaving construction joints. When a construction joint must be left, it should be formed as an inclined joint with a rough surface. The next time joining the joints, apply thin mortar first and then pour the material; the joint area should be compacted and smoothed out. During the hot periods of summer and autumn, modified water glass concrete begins to set and take shape within a few minutes; therefore, it is necessary to compact and level it quickly on site. It is advisable to achieve a smooth surface before the concrete starts to set, so as to achieve a single-layer finish, thereby avoiding wrinkles that may appear after setting and could affect the appearance as well as the concrete’s resistance to seepage and corrosion. 3. Form removal and curing: During the curing period, it is strictly prohibited to come into contact with water or steam, as well as very dilute acids. Generally, it is carried out according to the ambient temperature, form removal time, and curing time as shown in the table below.