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The Vikings were also phenomenal engineers. Their inventions and innovations gave them an edge in battle, trade, and other pursuits, enabling them to sail across oceans, seas, and inland rivers. …
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US9328021B2 US14/659,429 US201514659429A US9328021B2 US 9328021 B2 US9328021 B2 US 9328021B2 US 201514659429 A US201514659429 A US 201514659429A US 9328021 B2 US9328021 B2 US 9328
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In the cement and industrial mineral grinding technologies, liquid grinding aids are used to prevent the coating-effects on grinding media and mill equipment, agglomeration of fine particles, to increase the grinding performance, fineness of the product, and energy efficiency [1,2].Amine and glycol compounds are the most widely …
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Effects of grinding aids on activation and fineness of steel slag, Feng et al., Guisuanyan Xuebao (2010), 38(7), 1160-1166. Primary Examiner: MARCANTONI, PAUL D ... As noted above, in one aspect the invention provides a grinding aid composition for cement clinker grinding. The composition advantageously improves the efficiency of a …
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1. Introduction. Grinding aids, first introduced into cement manufacturing in 1930 [], are surface-active substances that facilitate particle comminution during the milling process.In the production of Portland cement, grinding aids are added in small amounts in the range of 0.01 to 0.10% by weight of cement, according to the PN-EN 197-1 standard [].
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The history of grinding aids in dry fine grinding processes starts in the late 1930s with the application of the first commercial grinding aids in the cement industry [1]. Since that time, the importance of grinding aids in industrial dry fine grinding processes …
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Grinding aids (GAs) are polar chemicals introduced in cement mills in either liquid or powder form to improve on mill grindability efficiency. Studies have shown that some GAs not only help in ...
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The grinding aids according to the invention are water-soluble or dispersible in water and can thus be easily diluted. The addition of water-diluted grinding aids have proven particularly useful in the grinding of cokes in jet mills, especially in jet mills powered by hot gas. It is known that the dry fine grinding of cokes in jet mills is a ...
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Sword Grinding in The Eadwine Psalter, a 12th-Century Illuminated Manuscript, Which Includes Colored Copies, Like This One, of The Images in The Utrecht Psalter. ... Museum, this month we are going to take a …
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The story of who invented the angle grinder is a bit murky, with different claims and conflicting information. Some sources suggest that a German company named Ackermann + Schmitt (now FLEX) invented the first high-speed angle grinder in 1954, while others credit a man named Thomas Joseph with inventing the tool in 1973. ...
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Grinding aids for hydraulic cement . United States Patent 4643362 . Abstract: Hydraulic cements such as Portland cement are interground with diesters formed by reacting a polyol (e.g. alkylene glycol) with a monobasic carboxylic acid (e.g. acetic acid) to enhance the efficiency of the grinding operation. ...
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In experiments to test the efficiency of grinding aids according to the invention in the grinding of granular blast furnace slag, test grinds were made in a laboratory batch mill. In the experiments, 3500 g (sample A) or 3400 g (sample B) of granular blast furnace slag (-20 mesh) were ground along with various percentages (0.02-0.04 percent ...
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The invention relates to an aqueous polymer composition which is used in the form of a cement grinding aid and makes it possible to effectively reduce the grinding time and to obtain cements exhibiting excellent characteristics. A cement grinding aid containing a combination of polymer A and known cement grinding aids is also …
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The grinding aids of the present invention are particularly preferred for use with cement, particularly portland cement. Portland cement represents a class of hydraulic cements and is comprised essentially of two calcium silicates and a lesser amount of calcium aluminate. These cements are-produced by heating an intimate mixture of finely ...
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The early 1900s. In the 20th century, hearing aid design progressed with the production of the electronic hearing aid. While Alexander Graham Bell wasn't directly involved with the invention of this new electric hearing aid, the technology used to create the telephone was utilized in developing the pioneering devices.
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1. Introduction. The term chemical additives or grinding aids (GAs) refers to any substance which results in increased grinding efficiency and reduction in power consumption when added to the mill charge (amounts not exceeding 0.25 wt.% of the feed) during grinding [1], [2], [3].The use of grinding aids to increase mill throughput is quite …
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grinding tin cement grinding aids Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. ... German (de) Other versions DE19833603C2 (en Inventor Franz Schrewe Juergen Krell Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no ...
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The present invention relates to activated grinding aids of a kind of slag micro powder and preparation method thereof, its feed composition and the weight part shared by each component are respectively: amide compound 15 ~ 45 weight part, alkanolamine 3 ~ 35 weight part, quadrol or derivatives thereof 5 ~ 20 weight part, deer 0.1 ~ 0.5 weight …
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Grinding aids can directly lower the energy of the comminution (i.e. grinding) process and allow for more efficient throughput of mineral ore. These chemical additives also have been shown to increase the level of fines produced during the grinding stage thus increasing efficiency. ... [0013] In an aspect of the invention, the grinding aid ...
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The present invention concerns an improved method of grinding or milling fresh feed (i.e. crushed yet not milled clinker (with or without additions)), using two different grinding agent systems added at specific locations of the cement grinding mill, preferably at two different locations of a cement ball mill, depending on the particle size or fineness of the material …
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As discussed above, it is assumed that the grinding aids of the present invention function by interacting with the silica present with the solid. Thus, the amount of grinding aid needed is related to the amount of silica present. Additional factors to be considered include mill type, slurry volume, number and size of grinding media, raw ore or ...
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Grinding aids, first introduced into cement manufacturing in 1930 [], are surface-active substances that facilitate particle comminution during the milling process.In the production of Portland cement, grinding …
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The effect of clinker grinding aids (GAs) on mill performance and cement properties is currently quantified in real-scale grinding plants. In fact, laboratory-grinding mills operated for given time interval do not consider the effect of circulating load, thereby leading to increased specific energy consumption (Ec) with excessively wide cement …
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In cement grinding, it is known to add so-called grinding aids which can improve the grinding process. Grinding aids are also frequently referred to as grinding additives. Amines or glycols are frequently used as grinding aids. ... The problem of the invention is to provide a grinding aid for cement grinding, which at the same time also is ...
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Based on proprietary chemistry, this family of products reduces ore cohesion and adhesion throughout the grinding circuit, increasing throughput and eliminating production bottlenecks.
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Abrasive grinding tools with hydrated and nonhalogenated inorganic grinding aids Download PDF Info Publication number US6251149B1. US6251149B1 US09/075,294 US7529498A US6251149B1 US 6251149 B1 US6251149 B1 US 6251149B1 US 7529498 A US7529498 A US 7529498A US 6251149 B1 US6251149 B1 US 6251149B1 ...
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The invention discloses a cement grinding aid, comprising calcium formate solution, compound glycerol distilled residue solution, triethanolamine, diols and molasses. While the product reutilizes the industrial wastes, the components of the product synergistically act to optimize the efficacy of the grinding process and the product modifies the cement …
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1. Introduction. The term chemical additives or grinding aids (GAs) refers to any substance which results in increased grinding efficiency and reduction in power …
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grinding aids which can improve the grinding process. Grinding aids are also frequently referred to as grinding additives. ... which is used according to the invention as grinding aid, in that regard also acts as a superplasticizer. As grinding aid in cement grinding according to the invention, an additive comprising polycarboxylate ether and ...
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ADVANTAGES OF THE INVENTION. Cement grinding aids have been used for many years, and it is estimated that U.S. consumption of such chemicals is currently 30-40 …
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