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CALCINED LIME
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Calcined Lime (or calcium oxide, or burnt lime), is obtained by calcining(controlled heating-time and temperature) limestone at temperatures above 900°C. This highly reactive product is essential to many industrial processes.
CaO (Calcium Oxide) is the chemical formula of quick lime, which is also called as calcined lime, burnt lime and unslaked lime.These are white and in lumps and powder in form with CaO contents varying from 90% to 80% and it reacts with water and heat is generated. |
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IDENTIFICATION |
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Chemical name: |
Calcium oxide
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Product name(s): |
Steel Grade-Large, Steel Grade-Large Rescreened, Steel Grade-Small,
Steel Grade-Small Rescreened, Water Grade-Small, Water Grade-Small
Rescreened, Mini Pebble, Rice, PCC Grade-Large Rescreened, PCC
Grade-Small Rescreened, Hi Cal Fines, Pulverized Lime, Pulverized
Lime |
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Formula: |
CaO |
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Molecular Weight |
56.08 |
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Material Uses |
• Food Industries
• Paper Industry
• Paint Industries
• pH Control
• Metallurgical Industries (Copper, Aluminum, Steel, Iron, etc).
• Glass Industry
• Sugar Industries
• Construction,
• White Wash
• Agriculture to improve acidic soils
• Pollution control
• Making Autoclaved Aerated concrete (AAC) Blocks.
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Process |
High calcium quicklime readily reacts with water to form hydrated lime. The reaction is highly exothermic and the process is known as "slaking". The reaction is usually carried out in a "slaker" (a specially designed mixer) which, through a process of rigorous mixing, makes certain that all of the quicklime has come into intimate contact with water and no unreacted quicklime remains. From a general viewpoint the hydrated lime produced can be in the form of dry hydrate, putty slurry, or "milk of lime".
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Quick Lime specifications - |
Quick Lime/Calcined
Lime/Burnt Lime/ Calcium Oxide
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Calcium Oxide
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CaO
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85% to 90%
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80% – 85%
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85% – 90%
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Calcium Carbonate
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CaCO3
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3%
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5%
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2%
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Magnesium Oxide
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MgO
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1 %
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1%
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1%
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Acid Insoluble
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SiO2
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3%
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5%
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3%
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Alumina
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Al2O3
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0.1 %
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0.1 %
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0.1 %
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Iron
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Fe2O3
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0.1 %
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0.1 %
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0.1 %
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Chloride
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Cl
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Traces
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Traces
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Traces
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Moisture
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---
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---
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---
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Mesh
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(BSS)
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Lumps
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Lumps
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Powder (200 Mesh)
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Hydrated Lime/Slaked Lime/Calcium Hydroxide |
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Hydrated Lime (or calcium hydroxide, or slaked lime) is usually a dry powder resulting from the controlled slaking of quicklime with water. The exothermic or released heat of reaction is captured and used to evaporate the excess slaking water.
Hydrated Lime is a chemical, with chemical formula Ca(OH)2 {Calcium Hydroxide}. Hydrated Lime is also known as Slaked Lime. It is white and in powder form with Ca(OH)2 contents varying from 96% to 70%. |
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IDENTIFICATION |
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Chemical name: |
Calcium hydroxide |
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Product name(s): |
Hydrated Lime, Industrial Hydrate |
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Formula: |
Ca(OH)2 |
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Molecular Weight |
74.08 |
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Material Uses |
. Water Treatment Plant
. Effluent Treatment Plant
. pH Control
. Paint Industries
. Petroleum refining Industries
. Food Industries
. Leather Industry
. Paper Industry
. Pesticides
. Fertilizers
. Metallurgical Industries (Copper, Aluminum, Steel, Iron, etc)
. Marble/Granite Cutting
. Glass Industry
. Pharmaceutical Industry
. Cement paints
. Bleaching Powder
. Di Calcium Phosphate manufacturing
. Rubber Industry
. Road making and construction
. Sugar Industries
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Specification of Hydrated Lime - |
Hydrated Lime/Slaked Lime/Calcium Hydroxide |
Calcium Hydroxide |
Ca(OH)2 |
96% |
92% |
90% |
85% |
80% |
75% |
70% |
Calcium Oxide |
CaO |
72.5% |
69.5% |
68% |
64% |
60.5% |
56.7% |
52.9% |
Calcium Carbonate |
CaCO3 |
0.5% |
1% |
2% |
4% |
6% |
8% |
12% |
Magnesium Oxide |
MgO |
0.4% |
0.4% |
0.4% |
0.4% |
1% |
1% |
1% |
Acid Insoluble |
SiO2 |
0.1 % |
0.2% |
0.4% |
1.2% |
2.5% |
4% |
6% |
Alumina |
Al2O3 |
0.03% |
0.03% |
0.05% |
0.10% |
0.15% |
0.20% |
0.25% |
Iron |
Fe2O3 |
0.03% |
0.03% |
0.05% |
0.10% |
0.15% |
0.20% |
0.25% |
Moisture |
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0.2% |
0.3% |
0.5% |
0.5% |
0.5% |
0.5% |
0.5% |
Mesh |
(BSS) |
400 |
375 |
250 |
200 |
175 |
150 |
150 |
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CALCINED DOLOMITE |
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Calcined Dolomite or Flux Dolomite is the name given to the quicklime formed from calcining a natural dolomitic limestone that contains nearly an equal molar weight percentage of calcium oxide to magnesium oxide.
Dolomitic quicklime is the name given to the quicklime formed from calcining a natural dolomitic limestone that contains nearly an equal molar weight percentage of calcium oxide to magnesium oxide. Ideally, this quicklime would contain 56% calcium oxide, 40% magnesium oxide, and 4% other major lime impurities such as iron oxide, aluminum oxide, silicon dioxide, and sulfur. |
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IDENTIFICATION |
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Chemical name: |
Calcium magnesium oxide |
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Product name(s): |
: InjectoLimeTM Pebble Lime-Large, Pebble Lime-Small, Pebble
Lime-Rescreened, Mini Pebble, Pebble Lime, Rice, Fines,
Pulverized Lime, Dolopel, Dolopel Fines, HD Dolopel |
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Formula: |
MgO · CaO |
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Molecular Weight |
96.38
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Process |
The production of high calcium quicklime (magnesium oxide) requires a large amount of heat, which is generated in the kiln environment. The quarried and sized high magnesium limestone travels through a rotary kiln and is subjected to these high temperatures where the calcium carbonate begins to dissociate with the resultant formation of magnesium oxide. The minimum temperature for the dissociation of calcium carbonate is 1648°F (898°C). For practical production purposes, however, the kiln temperature range is from an initial temperature of about 1750°F (954°C) to a final temperature of about 1950°F (1066°C). These temperatures can vary dependent upon the nature of the limestone being calcined.
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"Dolomitic" Limestone Calcination:
CaCO3 o MgCO3 + Heat ---> CaO o MgO + 2CO2
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Content Percentage |
MgO- 35%
CaO- 55%
SiO2- 2%
R2O3- 2%
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