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lime slaking rates

The kinetics of lime slaking ScienceDirect

The rate of slaking of a rotating lime disc was approximately constant with time but depended on the disc rotation speed. In the presence of Ca 2+ or OH − ions, the slaking rate was reduced. These results were accounted for by assuming that the slow step in the early stages of the slaking reaction was the diffusion of calcium hydroxide away from the reacting surface.

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The kinetics of lime slaking ScienceDirect

01/01/1990· It can be seen that the slaking rate of the lime which has had the additional heating at 1020 is appreciably slower than that of the original sample prepared by heating at 920 C. As noted earlier, the effect of increasing the time or temperature of calci- nation is to increase the degree of coalescence of the lime particles, thus de- creasing the reactant area. That this reduction in reactant

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What Is Slaking Of Lime? Process Of Slaking |2020|

07/12/2019· Slaking nature of lime (whether quick-slaking, medium shaking, or slow slaking). Quantity of water for slaking. Temperature to be maintained during slaking ( The optimum temperature for slaking varies from 85 ºC to 98 ºC, depending upon the type of lime). Minimum duration for slaking and maturing.

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(PDF) Factors influencing the reactivity of quicklime

02/01/2008· The influence of storage and production on the reactivity, i.e. the slaking rate of lime in water, has been investigated. It was found that hard burning of the lime during calcinations

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Standard Test MISC CHEMICAL FOR CONSTRUCTION Procedures

lime slaking rate test time / min temperature time / min temperature 0 5.5 0.5 6.0 1.0 6.5 1.5 7.0 2.0 7.5 2.5 8.0 * 3.0 8.5 3.5 9.0 4.0 9.5 4.5 10.0 5.0 10.5 lime reactivity criteria action temp increase of 40oc in 3 minutes none required high total slaking period is less than material deemed ten minutes acceptable temp increase of 40oc in 3 to 6 send sample to medium minutes src for chemical

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AN OVERVIEW OF LIME SLAKING AND FACTORS THAT AFFECT

A slurry slaker generally uses an initial lime to water ratio of 1 to 3.3 to 1 to 5 depending on the make of equipment and quality of CaO and water. Typically a slurry slaker, sometimes called a detention type slaker, is comprised of two chambers. The first chamber is called the slaking chamber where lime and water are mixed.

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AN OVERVIEW OF LIME SLAKING AGT Group

A slurry slaker generally uses an initial lime to water ratio of 1 to 3.3 to 1 to 5 depending on the make of equipment and quality of CaO and water. Typically, a slurry slaker, sometimes called a detention type slaker, is comprised of two chambers. The first chamber is called the slaking chamber where lime and water are mixed.

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The standard reactivity test as a measure of lime’s quality

Commercial lime slakers in industry normally operate by using 3 to 4 parts of water for 1 part of unslaked lime. In the test procedure a 4:1 ratio of water to lime is recommended. This led to a decision to include an assessment of different water:solid ratios on reactivity in the investigation.

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The kinetics of lime slaking ScienceDirect

01/01/1990· (2) The slaking rate of pure lime powders can be described by the shrinking sphere model. (3) The slaking rate of pure lime powders depends on the particle size of the powder and the calcination conditions under which the lime was made from calcium carbonate. High calcination temperatures and long calcination times cause coalescence of the lime particles and a reduction of slaking rate. This

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Ratio Of Lime To Drinking Water Drinking Water

The detention-type slaker admits water to maintain a desired ratio with the lime, and therefore the lime feed rate sets the retention time of the slaker. The detention slaker operates with a wide range of water-to-lime ratios (2.5:1 and 6:1), moderate temperature, and a 1 0-minute slaking time at maximum capacity. A water-to-lime ratio of from 3.5:1 to 4:1 is most often used. The operating

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(PDF) Factors influencing the reactivity of quicklime

03/10/2020· The influence of storage and production on the reactivity, i.e. the slaking rate of lime in water, has been investigated. It was found that hard burning of the lime during calcinations

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The kinetics of lime slaking Murdoch University

Although the slaking of lime is a reaction of great antiquity, there have been few fundamental studies of its kinetics and mechanism. In this paper, the kinetics of the reaction are reported for lime samples in two different arrangements: rotating discs and powders. In the former case, the rate was measured by solution analysis; in the latter, by calorimetry.

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Standard Test MISC CHEMICAL FOR CONSTRUCTION Procedures

lime slaking rate test time / min temperature time / min temperature 0 5.5 0.5 6.0 1.0 6.5 1.5 7.0 2.0 7.5 2.5 8.0 * 3.0 8.5 3.5 9.0 4.0 9.5 4.5 10.0 5.0 10.5 lime reactivity criteria action temp increase of 40oc in 3 minutes none required high total slaking period is less than material deemed ten minutes acceptable temp increase of 40oc in 3 to 6 send sample to medium minutes src for chemical

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(PDF) Effects of liming ratio on lime mud settling and

The effects of lime-to-liquor ratio and mixing during slaking and of lime and liquor temperatures on causticizing and lime mud settling have been studied. To increase the causticizing rate for a

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The standard reactivity test as a measure of lime’s quality

Commercial lime slakers in industry normally operate by using 3 to 4 parts of water for 1 part of unslaked lime. In the test procedure a 4:1 ratio of water to lime is recommended. This led to a decision to include an assessment of different water:solid ratios on reactivity in the investigation.

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A REVIEW OF LIME SLAKERS

• dry lime feed rate The reactivity of lime changes from load to load, therefore, it is difficult for the operator to judge the reactivity unless the slaker is equipped with a slurry temperature indicator. The temperature of water is easier to detect since temperature only changes with seasonal changes (assuming surface water is used). For the operator to detect these changes and make proper

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COMPLETE PLANT CAPABILITY LIME SYSTEMS LTD

Each mill is capable of slaking pebble lime at a rate of 13TPH or powdered lime at a rate of 26TPH for a total dry throughput rate of 52 TPH ANAGOLD MADENCILIK

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ASTM C110 16e1 Standard Test Methods for Physical

Application testing shall include test methods for slaking rate of quicklime, dry brightness of pulverized limestone, limestone grindability determination by the laboratory ball mill method, and settling rate of hydrated lime. Particle size analysis shall include test methods for residue and sieve analysis, fineness of pulverized quicklime and hydrated lime by air permeability, particle size

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