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Quicklime

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Технические характеристики
  • БрендTNGGS
  • Страна производительУзбекистан
Описание

QUICKLIME

Lime is the binding material obtained by high-temperature annealing (1000-1200°С) in the shaft or rotary furnaces of sedimentary rocks consisting mainly of calcium carbonate CaCO3 (limestones, chalk, dolomite). The following chemical reaction occurs under temperature: CaCO3 → CaO + CO2↑.

However, calcium carbonate losses up to 44% of the weight with carbon dioxide, and become light and porous. Resultant product is the lump quicklime (fine porous slices of 5-10 cm). Subsequently, lump quicklime is exposed either to slaking with the use of water or post-grinding with obtaining of powdered quicklime.

Advantage of powdered lime over lump one consists in that during mixing it behaves like gypsum binding material: firstly, it forms plastic paste, and sets after 20-40 min. This may be due to the fact that water forming a paste is partially consumed for lime slaking. However, lime paste thickens and losses plasticity. Due to less amount of free water the powdered lime-based materials are less porous and stronger. In addition, lime during slaking is warmed-up that facilitates work with it in cold weather. Water required for mixing makes 100-150% of lime weight, depending on lime quality (to be determined experimentally).

The most critical quality indexes of powdered quicklime are:

  • Activity - percentage of oxides to be able to be slaked;
  • Number of non-slaked grains (underburning or overburning)
  • - Underburning (undecomposed СаСО3) occurring at very low burning point; reduces lime quality, because it has not binding properties.
  • - Overburning occurs at very high burning point. Overburning grains are slaked slowly and can cause cracking and rupture of already hardened material.
  • Slaking time:


Lime is subdivided into the following types depending on slaking time:

Quick-slaking

up to 8 min

Medium-slaking

up to 25 min

Slow-slaking

at least 25 min

Specification:

No.

Name of Parameter

Content

1.

Active CaO+MgO

min 80%

2.

Active MgO

max 3.5

3.

CO2

max 5.0

4.

Slaking point

С 92

5.

Slaking time, min

2,5

6.

Non-slaked grains, %

max 11.0

7.

Sieve residue, max

No.2

No.008

98,6

85,3

Performance characteristics:

Active Cao+MgО, min - 90%

Active МgO content, max - 2.8%

СО-2 content, max - 1.5%

Maximum slaking point - 98°C

Slaking time, max - 8 min

Non-slaked grains, max - 4%

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