cement grinding aid recipe
Cement grinding aid can be produced by many enterprises. They take their money and cooperate with the one who have the technology. Then what is the recipe for the cement grinding aid after all? Today Great Wall Machinery shares this recipe with you.
The powder grinding aid is usually made by the material of triethanolamine (grind-aiding), industry salt (may leads to the chloridion exceeds standard) and the mirabilite & anhyhdrous sodium sulphate (easy to crystallize). As a carrier, the fly ash will be mixed fully with these materials.
The liquid cement grinding aid receipt is made by the triethanolamine, trisopropanolamine, glycol, sugar ether (color matching, adjust the cement setting time), natrium aceticum and dodecyl benzene (increase the flow rate), etc. Mixing in a fixed vessel completely and then bulking in the bucket.
These grinding aid receipts are not the one that once for all. It needs the test through trial and error. The new standard on the cement requires high efficiency cement grinding aid products. It is imperative that to transform from powder grinding aid to the liquid. Nowadays, some of the research institute and the enterprise have developed new technology for the high molecular synthetic grinding aid products.
impact of grinding aids on dry grinding performance, bulk properties and surface energy - sciencedirect
The impact of the grinding aid is primarily determined by its group of substance.Additives with a high ratio of non-polar to polar parts require higher dosages.The powder flowability has an overlapping effect on the grinding mechanism.A strong relation between additive, surface energy and bulk properties was shown.
In dry fine grinding processes the relevance of particle-particle interactions rises with increasing product fineness. These particle-particle interactions reduce the grinding efficiency and complicate the process control. The adsorption of grinding aid molecules on the product particle surface is a common measure to handle these effects. To ensure an efficient grinding aid application, the impacts of additives on particle and bulk properties, which influence the micro-processes inside the mill, need to be understood. Within this study the effects of several grinding aids on dry fine grinding of limestone in a laboratory vibration mill were investigated. Unlike in many other scientific works, the impacts of grinding aids were analyzed on different levels simultaneously: Grinding success and agglomerate size distributions were evaluated by wet and dry particle size measurements, respectively. Additionally, material coating on the grinding media, powder flowabilities and particle specific surface energies were measured. It was shown that all of the investigated grinding aids influence the grinding efficiency. However, the formation of agglomerates is not necessarily linked to the product fineness. Furthermore, a strong impact of certain grinding aids on the flowability of the product powder was determined. Thereby, the bulk flow behavior also determines the grinding result as it affects the stress mechanism inside the mill. Moreover, a direct relation between surface energy and powder flowability as well as agglomeration behavior could be demonstrated.
grinding aids for dry fine grinding processes part i: mechanism of action and lab-scale grinding - sciencedirect
The major grinding aid mechanism is to reduce adhesive and cohesive particle forcesThe additive-induced change of the particle and bulk behavior determines how the product reacts to the stress conditionsNot only liquid and dissolved but also solid as well as gaseous chemicals can principally act as a grinding aidNew measurement techniques help to improve the understanding of grinding aids on the particle levelHowever, a comprehensive understanding of the grinding aid impacts on the grinding performance is still not fully achievedA comprehensive understanding is needed for an efficient selection of appropriate chemicals/concentrations
Grinding aid additives are established in various industrial dry fine grinding processes, primarily to achieve either a) an increase of the production capacity, b) a decrease of the specific energy consumption or c) finer particles or a better product performance. However, even though numerous related scientific papers have already been published and a variety of grinding aids are currently applied in industrial processes, a comprehensive understanding of grinding aids is still missing. Thus, their selection and application is still mainly based on empirical knowledge. Therefore, this review gives a wide-ranging overview on grinding aids with special regard on their mechanisms of action, their impacts on the powder properties and the additive effects during lab-scale grinding. It is shown that the variety of applied substances, ground materials, target finenesses and analysis methods complicate the development of a comprehensive understanding, and how the mill type and grinding conditions influence the additive effects.
impact of grinding aids and process parameters on dry stirred media milling - sciencedirect
The impact of the process parameters in dry stirred media mills may vary with the choice of grinding aid.The grinding result of dry stirred media mills strongly depends on the powder flow behavior.It is crucial to adjust the process parameters of the mill as a function of the type of grinding aid.
The demand on minerals with increasing product fineness is currently rising in many industrial applications. Especially in dry grinding processes, fine powders are difficult to produce and to handle. Particle-particle attractive forces, which become more decisive with decreasing particle size, lead to a higher extent of agglomeration, material adherences and a more cohesive flow behavior. As a consequence, dry fine grinding processes demand large quantities of energy due to the amount of applied energy that is dissipated into heat. Current approaches for improving the energy efficiency mainly cover the improvement of a) machine equipment and b) the material behavior. The main focus of this study was to investigate both aspects within one single study: On the one hand, dry fine grinding of limestone was investigated in a dry operated stirred media mill, which is a promising and emerging option for dry fine grinding applications. On the other hand, the impact of the particle stabilization by liquid grinding aids on the grinding performance was evaluated. It was demonstrated that the grinding mechanism inside the mill depends on both the mill parameters as well as the powder flow behavior. Therefore, it is of crucial importance to adjust the mill parameters to the applied grinding aid when it comes to dry fine grinding in media mills.
cement grinding aids
Regular Cement Grinding Aid (RGA) or in other term is called as Conventional Cement Grinding Aid) has been used for more than 40 years in the cement industry. The cement grinding aids is additional material in liquid or solid form, admixed in small amount during the cement clinker grinding process which can significantly improve the grinding efficiency and reduce energy consumption, without compromising the performance of the cement. The cement grinding is an energy intensive process. The addition of grinding aid during the process of cement grinding, results in improvement of the specific surface and grind-ability of the material ground. This is attributed to the additives ability to reduce resistance to comminution and to prevent agglomeration of the freshly ground particles (due to neutralization of static charges) and powder coating on the grinding media (balls) and mill liners. The overall result is the reduction in the unit energy consumption and increased mill output or increased efficiency of the mill.
In addition of the main purpose to increase the efficiency of cement grinding process (increase mill output and reduce grinding cost), some cement grinding aids are also formulated to provide important strength gain effects on the final cement product Cement grinding aids that provides these kinds of extra properties are called as Cement Performance Enhancer (CPE) or in other term is named as Cement Quality Improver. The high cost of clinker and the trend to reduce CO2 emission, drive the cement manufacturing to reduce clinker ratio (CR) by replacing significant percentage of clinker with lower cost filler material such as limestone or SCM material (Supplementary Cementitious Material) such as fly ash, trass and slag. This situation makes using of Cement Performance Enhancer (CPE) in cement grinding process become very important in current cement global industry. Cement Performance Enhancer (CPE) will maintain or even increase cement strength performance in lower clinker ratio (CR) composition.
Raw materials that are used to produce clinker need to be ground in order to get high level of particles fineness. Similar with cement grinding aid, grinding process efficiency of cement raw materials will also affect raw mill output. Raw materials that are used to produce clinker need to be ground in order to get high level of particles fineness. Similar with cement grinding aid, grinding process efficiency of cement raw materials will also affect raw mill output. Cement Raw Mill Grinding Aid (RM-GA) act to improve the specific surface and grind-ability index of the material ground. That is attributed to the additives ability to reduce resistance to comminution and to prevent agglomeration of the freshly ground particles (due to neutralization of static charges) and powder coating on the grinding media (balls) and mill liners. The overall result is the reduction in the unit energy consumption and increased mill output or increased efficiency of the mill.
preparation and analysis of a polyacrylate grinding aid for grinding calcium carbonate (gcc) in an ultrafine wet grinding process - sciencedirect
A novel GCC grinding aid was prepared by aqueous polymerization.The fluidity of the GCC slurry was remarkably enhanced by the synthetic grinding aid.Influence of P(AA/AMPS) on the grinding of GCC was investigated by SEM and ATR-FTIR.The grinding mechanism was that aggregation was minimized by an electrostatic effect.
A novel GCC grinding aid was prepared by aqueous polymerisation. The following optimal synthetic conditions were determined by grinding experiments: weight ratio of monomers 2-acrylamido-2-methyl propane sulphonic acid (AMPS)/acrylic acid (AA)=1:4, weight ratio of isopropanol/water=1.25, reaction temperature 80C, reaction time 5.5h, initiator dosage 4wt.% (based on total monomers) and pH45, adjusted using NaOH at the end of the reaction. The products were characterised using FT-IR, NMR, and an Ubbelohde viscometer. The grinding aids, synthesised under the above conditions, exhibited a moderate anionic charge density (9.75mmolg1), an appropriate molecular weight (~3000g/mol), and stable performance. When the synthetic grinding aid was used in the ultrafine wet grinding of GCC, the fluidity of the GCC slurry was remarkably enhanced, and the content of GCC particles with W (2m) increased by 9.3% compared with the control. The influence of P(AA/AMPS) on the grinding of GCC was investigated by SEM and ATR-FTIR, and the adsorption of the polymer chain on the particle surface was found to minimize aggregation through an electrostatic effect, reducing the viscosity of the GCC slurry.