Cohesive time: Apply a well-mixed slurry to the brick's [email protected] surface with a trowel evenly. Place a 53mm metal spacer on the inner side of each side of the coating 230mm at a distance of 30mm, parallel to the 114mm diameter. Edge, and then put another brick on this brick, hold down the above brick, along the length of 230mm, rubbing back and forth with the spacer rod as a roller 45 times, make a specified thickness of the seam, start the stopwatch (this The operation should be completed within 10s). Then, remove the excess slurry while rotating the spacers, and continue to knead the top brick back and forth along the length of 230 mm until the stopwatch is almost impossible to knead, and read the sticking time. After the fine powder distribution was consulted, the fine powder gradation was preliminary explored. The tests showed that the coarse powder was large, the slurry bonding time was short, the plasticity was poor, the mortar seam was not full, the flow was easy to flow, and the overall construction performance was poor. It is related to less free water contained in the mud; less coarse and fine powder, longer mud bonding time, better plasticity, fuller mortar seam, less turbulence, and good overall construction performance, but it is difficult to ensure the thickness of the brick seam, and the coarse and fine powder is too small. It will cause the high temperature shrinkage of the mud to become larger, and in severe cases it will cause the separation of the mud and the brick, and will not achieve the effect of adhesion, so that the service life of the entire lining lining refractory material will be reduced. After comprehensive consideration, it is considered that the Chinese formula is better. Plasticizers and gelling agents In order to improve the construction performance of mud and adjust the bonding time, an appropriate amount of plasticizer must be added, and some plasticizers can also enhance the infiltration of mud by the sample and increase the flexural bond strength. In addition, improving the sinterability of the slurry and increasing the bond strength between the medium and high temperature of the slurry are crucial. It can make the lining of the entire kiln as a whole, which can effectively prolong the service life of the kiln. Therefore, the test has also been added. The right amount of clay powder, clay powder can also play a plasticizing effect. Due to the clay's colloidal properties, mud viscosity increases, fluidity decreases, and free water increases. After the slurry is dried, it is looser and the bond strength at medium and high temperatures decreases. Therefore, an appropriate amount of debonding agent must be added to the mud to release the clay, release free water, reduce water consumption, reduce viscosity, and enhance fluidity. The essence of the gelling agent is to use the principle of cation replacement to increase the F potential of the clay colloid and increase the repulsion between the particles. When the repulsive force exceeds the van der Waals force, the clay particles are difficult to move closer to each other, so as to achieve decomposition of the gel. purpose. Test 1 shows that as the addition of plasticizers and sizing agents increases, the plasticity of the mud increases, the bonding time increases, the wettability of the sample increases, and the flexural bond strength increases. However, if the amount is too large, it will cause the test Such high-temperature shrinkage increases, the anti-folding bond strength decreases, and in severe cases it also results in the separation of the mud from the brick, but does not achieve the effect of adhesion. After comprehensive consideration, it is considered that the effect of using 2a% natural polymer A, 1b% polymer B, 2c% organic material C, and 2d% inorganic salt D is better. Because the high-alumina slurries contain extremely complex colloidal solutions, accelerators must be added to neutralize the charge of the micelles in the colloids, destroy the micelle's solvation membrane, and cause the colloidal particles to coagulate and turn into elasticity. Colloids. The colloids are further dehydrated and eventually become gels with solid properties. The gel continuously precipitated from the solution and coagulated, deposited on the surface of the powder and the sample, making it cemented and hardened to obtain strength. In order for the high-alumina slurry to have a suitable hardening speed at room temperature, the required strength is obtained. The type and amount of accelerator must be carefully selected, the hardening speed is too fast, the bonding time and the construction time are short, it is easy to cause the waste of the mud, or even the construction; the hardening speed is too slow, the curing time is long, and the construction progress is not affected. Safety. In addition, generally, the coagulant is a strong fluxing agent, and if the amount is too large, the refractoriness and load softening temperature of the high-alumina slurry will be greatly reduced, and the overall service life of the lining of the kiln will be reduced. Tests show that adding 2f% of fluoride F is more appropriate. Conclusions (1) For the new high-alumina slurry, the addition of 10% 320 mesh fine powder to the powder has a good comprehensive effect. (2) When choosing the plasticizer degumming agent, it is considered that the effect of using 2a% natural polymer A, 1b% polymer B, 2c% organic material C, and 2d% inorganic salt D is better. (3) In the new type of high-alumina slurry, it is necessary to add an appropriate amount of admixtures such as accelerators, and tests have shown that adding 2f% of fluoride F is appropriate. Loader Parts,Track Loader Parts,Case Loader Parts,Skid Loader Parts JINING SHANTE SONGZHENG CONSTRUCTION MACHINERY CO.LTD , https://www.sdkomatsudozerparts.com