Grinding aids are chemical agents used to prevent cement particles from re-agglomerating during and after the grinding process, increasing efficiency and flowability. They reduce energy costs by turning the process into an endorgonic one, and can come in gas, liquid, or solid form. Chemical compounds like alkanolomines disperse charges on the surface of cement particles, preventing aggregation. The gel formed around the particles during hydration crystallizes, allowing them to stick together. Common additives include alkanolomines, monoethylene glycols, and sodium lignosulfonate. Coating the grilling apparatus with a powder further reduces energy needs and enhances efficiency.
A grinding aid is a special chemical agent used to assist in the grinding and mixing of cement. In particular, the grinding aids prevent the cement particles from re-agglomerating or re-adhering during and after the grinding process. Grinding aids help streamline the cement manufacturing process by increasing process efficiency and material flowability. These benefits of using cement grinding aids also help reduce energy costs by industrial mills.
The grinding aid began to gain popularity in the mid-20th century as a reliable tool for working concrete. Its effectiveness and reputation for reliability lies in its ability to reduce the surface tension between concrete particles caused by the stress of the grinding process. Chemical compounds known for their polar properties, such as alkanolomines, disperse charges on the surface of the cement particle. This coverage of charges prevents the individual particles from aggregating.
Hydration is also an important factor in the grinding process. When a grinding aid contacts a particle of cement, it forms an instant gel around the particle. This gel hydrates the grain and initially acts as a barrier from other cement particles. Over time, the gel crystallizes. This crystallization allows the cement particle to stick to each other, forming a fluid lattice structure.
Concrete grilling aids can come in the form of a gas, liquid, or solid. Typically, mills will use one of the following additives in their cement mixes: various types of alkanolomines, monoethylene glycols, diethylene glycols, sodium oleate, oleic acid, dodecylbenzenesulfonic acid, sodium lignosulfonate, or sulfite waste liquor. These chemicals ensure that the integrity of the concrete is kept intact while also helping to pulverize the concrete into manageable grains.
A reduction in energy costs is a major advantage of the use of grinding aids. Mills save money and energy when using these aids because the aids turn the cement production process into an endorgonic process, consuming energy from the surrounding environment. Since cement adjuvants allow the cement mix to absorb energy, less external energy is required for the reactions to take place. In this way, industrial mills save a huge amount of money by employing cement grinding aids.
In addition to a grinding aid, the mills will coat the balls and liners that make up the grilling apparatus with a powder. This powder further reduces the energy needed to run the cement manufacturing process. It also enhances process efficiency.
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