Enhancement of lime reactivity by addition of diatomite

2011 ◽  
Vol 92 (10) ◽  
pp. 1910-1919 ◽  
Author(s):  
Paul Maina ◽  
Makame Mbarawa
Keyword(s):  
Lime Reactivity

scholarly journals Evolution of physicochemical properties of quick lime at converter-smelting temperature

2021 ◽  
Vol 40 (1) ◽  
pp. 32-39
Author(s):  
Mengxu Zhang ◽  
Jianli Li ◽  
Zhengliang Xue ◽  
Renlin Zhu ◽  
Qiqiang Mou ◽  
...  
Keyword(s):  
Boundary Migration ◽  
Average Diameter ◽  
Dissolution Behavior ◽  
Grain Boundary Migration ◽  
Average Pore ◽  
Quick Lime ◽  
Volume Stability ◽  
Steel Making ◽  
Dissolution Efficiency ◽  
Lime Reactivity

Abstract The volume stability caused by the hydration of f-CaO is one of the main obstacles to the comprehensive utilization of steel-making slag. In view of the f-CaO produced by incomplete dissolution of lime, it is necessary to strengthen the dissolution behavior of lime in the converter process. The reactivity of lime determines the dissolution efficiency and is closely related to its microstructure. The experimental results show that the reactivity and porosity of quick lime decrease and the average diameter of pore increases with an increase in temperature. The CaO crystals gradually grow up under the action of grain boundary migration. When the temperature increased from 1,350 to 1,600°C, the lime reactivity decreased from 237.60 to 40.60 mL, the porosity decreased from 30.55 to 15.91%, the average pore diameter increased from 159.10 to 1471.80 nm, and the average CaO particle size increased from 0.33 to 9.61 µm. The results indicate that reactivity is decreased because of the deformation and growth of CaO crystals and the decrease in porosity in reactive lime. This will cause an obstacle to the dissolution of lime and is not conducive to the control of f-CaO in slag.

scholarly journals A Protocol to Quantify the Reactivity of Carbonate Lime for Horticultural Substrates

HortScience ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 1124E-1125
Author(s):  
Jinsheng Huang ◽  
Paul R. Fisher ◽  
William R. Argo
Keyword(s):  
Particle Size ◽  
Reaction Rates ◽  
Rapid Screening ◽  
Reactivity Index ◽  
Analytical Test ◽  
Horticultural Practice ◽  
Ph Level ◽  
Time Required ◽  
Lime Reactivity ◽  
Over Time

Lime sources vary in their reactivity depending on particle size, surface area and crystalline structure, and chemical composition. Current horticultural practice for testing lime reactivity and the appropriate lime rate is through batch trials where lime is incorporated into growing media. Our objective was to test a laboratory approach that would provide a rapid analytical test on reactivity of lime sources, and could eventually be applied to measuring unreacted (residual) lime in container media. Four moles HCl was added to a lime sample, and the volume of CO2 released over time was measured in a burette. Three lime types were tested, including reagent grade CaCO3, and two pulverized dolomitic limestones used in horticultural media. 100% of CaCO3 reacted in less than a minute after acid addition, whereas only 79.8% and 49.5% of the two commercial lime samples had reacted after 10 minutes. The time required for 50% of the two commercial lime samples to react was 5 and 10 minutes, respectively, whereas it took 20 and 60 minutes, respectively, for 95% neutralization. Reaction rates in the laboratory test correlated with the time required to achieve a stable pH level when limes were incorporated into a peat substrate. The reagent-grade CaCO3 raised pH more rapidly (within 7 days) and to a higher level (maximum pH 7.5 at 9 g of lime per liter of peat) compared with the dolomitic lime sources. It may be possible to establish a lime reactivity index, for example, based on CO2 release after 10 minutes, and thereby provide a rapid screening of limes. Further gasometric analysis of lime types used in horticultural substrates is therefore needed.

Lime Reactivity of Illinois Soils

1966 ◽  
Vol 92 (5) ◽  
pp. 67-92 ◽  
Author(s):  
Marshall R. Thompson
Keyword(s):  
Lime Reactivity

Properties Affecting the Reactivity of Lime

2021 ◽  
Vol 325 ◽  
pp. 92-97
Author(s):  
Dorothea Sklenářová ◽  
Karel Dvořák ◽  
Dušan Dolák
Keyword(s):  
Electron Microscopy ◽  
Total Porosity ◽  
Point Of View ◽  
Insoluble Residue ◽  
Sem Images ◽  
Geological Age ◽  
Different Temperatures ◽  
Identification Parameter ◽  
Lime Reactivity ◽  
Scanning Electron

Lime reactivity is the most used identification parameter for lime quality. The reaction may vary in its rate and maximum reached temperature. In this study, the influence of the properties of limestone on the course of the reaction is studied. The samples are thoroughly examined from a geological point of view (geological age and origin, genesis and diagenesis) and their physicochemical properties are described (total porosity, limestone category, chemical analysis, insoluble residue). Different temperatures and isothermal loads were selected to study the effect of the burning process on the lime microstructure. The newly formed CaO is observed by scanning electron microscopy (SEM images). Lime reactivity analysis is performed, and different reaction courses are compared.

scholarly journals CALAGEM E SILICATAGEM EM SOLO INCUBADO COM DIFERENTES UMIDADES

2012 ◽  
Vol 8 (2) ◽  
pp. 46-56 ◽  
Author(s):  
Juliano Carlos Calonego ◽  
Vitor Savoia Mora ◽  
Carlos Henrique Santos ◽  
Leandro de Oliveira
Keyword(s):  
Soil Moisture ◽  
Chemical Analysis ◽  
Agricultural Soils ◽  
Sandy Loam ◽  
Chemical Properties ◽  
Variance Analysis ◽  
Tukey Test ◽  
Lime Reactivity

The lime is theacidity correctivemore used inbrazilian agricultural soils, but important benefitscan be obtained fromcalcium and magnesiumsilicates. The aim ofthisstudy was to comparethe effectofneutralizingsoil aciditybyapplication of lime andsilicate, with incubationof the correctivesin soil conditionsmore orless moisture. The experiment was conductedin the Soil Chemical Analysis Laboratoryat the UNOESTE, using soil collected in the layer0-20cmof a Sandy Loam Argisol. The experiment was carried out in acompletely randomizedina 2x2x5 factorial scheme, with twocorrectives(lime and silicateof Ca andMg), twosoilmoistures(80 and20% moisturesoil saturation) and five times (60, 90, 120, 150 and180 daysafter incubation) ofsoil chemical properties. It was submitted to variance analysis and the effects of soil moisture and correctives were evaluated by Tukey test (p<0,05) and the incubations time were evaluated by regression analysis.The silicatehas a higherneutralizing capacityof soil aciditythan lime, and thusits dosageshould be further investigated, because the use of the calculationto determine thelime requirementcan overestimatethe need forsilicate applied. The lime reactivity in the soil is not influenced with soilmoisturebetween 20and 80% moisturesaturation, unlike silicate,which has itssoilreactivityenhancedin thecondition ofhigher moisture.Thesoil corrective actionacidityby bothcorrectiveremainsincreasingup to 180days ofincubation,however,satisfactory resultsare alreadyobtainedwith 60days ofsoil incubation

Lime reactivity and solution rates

JOM ◽  
1967 ◽  
Vol 19 (8) ◽  
pp. 104-106 ◽  
Author(s):  
Robert O. Russell
Keyword(s):  
Lime Reactivity
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