Skip to main content

Quick lime


What is Quick lime or Burnt Lime?
Burnt Lime also called as quick lime or calcium oxide is formed out of lime stone deposits or mines which are wide spread throughout India.
The calcium oxide is extensively used as a mortar within the construction of building by mixing in with suitable proportion of sand and surkhee of burnt clay as aggregate.
It is also used for white washing of homes and building.
Foundries, Iron and steel plants use lime as a fluxing agent in their process.
Some drugs and pharmaceuticals, paper industry, pesticides formulations and other chemical processing industries are using the unslaked lime or Quick lime.
As there are many applications of the quick lime, we should ensure particular properties of the quick lime for using in the recipe of AAC Blocks.

Properties required for Quick lime in AAC manufacturing:

Process of Manufacture

The limestone mined from quarry or rivers should be free from all defects and impurities, once washed and cleaned again for removal of dust particles.
These stone blocks are crushed manually or by jaw crusher in sizes of three to six inches.
Oil fired vertical shaft kiln (VSK) refractory lining inside portion having
about 33 metre conical vertical chimney, is employed for the firing or calcination of lime stone at a temperature of about 900O C.
The chimney of VSK is so arranged that the speed of exhaust
gases and fumes within the chimney may travel @ 9 to 12m/sec.
The diameter of chimney is so calculated that the lower/
bottom portion of chimney is one third of the entire stack of chimney. 
Skip bucket with rope, which is driven by electric motor, is arranged for loading of stone pieces for firing of calcination.
These stone pieces are loaded from the highest of kiln, this process is completed regularly as per the need of stone calcination. 
A cyclone or dust catcher is additionally arranged with a scrubber which collect about 50 to 80% dust particles and removed with scrubber. Approx. 4 kg. 6 kg. sludge/hr. is removed by this process which can be discharged to land fill.

The firing is done with the help of burner.

The firing is initiated from rock bottom section of kiln and after an appropriate interval the calcium oxide unloaded through the outlets provided at rock bottom section of kiln.
Property calcium oxide is sorted call at different grades sort of a , B and C grade.
Semi calcium oxide stones are charged again within the kiln for calcination.
The dust, clinkers ash and other harmful materials are removed
from the finished product properly sorted lime is packed and stored purchasable. 

Properties of Quick lime required for AAC manufacturing :



Testing of Quicklime for AAC manufacturing :

Please read in other page..

                                                         
Labels:

Comments

  1. MP30 June 2021 at 10:27

    https://www.buildmate.in/concrete-block-plants.php

    ReplyDelete
  2. MP30 June 2021 at 10:28

    Concrete Block Plant

    ReplyDelete
  3. Unknown7 September 2021 at 16:58

    After a long time, I read a very beautiful and very ismportant article that I enjoyed reading. I have found that this article has many important points, I sincerely thank the admin of this website for sharing it. Best side hung aluminium windows service provider

    ReplyDelete

Post a Comment

Popular posts from this blog

Recipe Calculation for AAC Blocks

Recipe is nothing but knowing the dry weight (batch weight) of one batch or one cake. To find out dry weight, we should know the desired dry density of final block. Let us work on the density of 600 kg/m³. Batch Weight = Density x Mould volume Density = 600 kg/m3 Dimensions of the mould : Length = 4840 mm = 4.84 M Width = 1250 mm = 1.25 M Height = 670 mm = 0.67 M Volume of the mould: 4.84 M x 1.25 M x 0.67 M = 4.0535 M³ Batch Weight = 600 x 4.0535 = 2432 kg (We have taken mould height 670 mm, which is actually depth of the mould. Generally we maintain the cake height equal to mould level. But in some AAC factories, cake height may be 650 mm or 680 mm depending on the parameters like quantity of returns required, sinking of cake, uneven surface of the cake, etc., In this case cake height should be taken to calculate the volume.) Batch weight or Dry weight consists of binders (Cement and Quicklime), Fly ash or Sand, returns and anhydrite. Usually th
5 comments
Read more

What is Aluminium Powder? Why it is used in AAC Plants?

  Aluminium Metal powder or paste Aluminium powder, which is commonly used as a reaction agent in AAC Plants, is a fine granular powder made up of Aluminium Metal. Process of Manufacture: The aluminium powder is usually manufactured in many forms such as flaky particles, granulated powder (atomised aluminium) etc. There are different processes one can use for the production of aluminium powder. The metal is melted in furnaces, and the temperature is maintained around 720 to 760 C. Atomised Aluminium is produced by blasting the stream of molten Aluminium into small articles by air jet. For this purpose, an atomiser is employed which consists of a straight tube with lower end dipped in molten metal and upper end terminating as a little orifice. A jet of hot air under pressure is passed through armular opening near the top which impinges on a stream of molten Aluminium drawn by suction through the orifice. This results in the formation of small particles of Aluminium. Th
16 comments
Read more

What is AAC? What are the properties of AAC? How AAC blocks are produced?

  Definition of AAC Blocks   AAC Blocks   A - Autoclaved A - Aerated C - Concrete   Autoclaved aerated concrete is a lightweight concrete containing uniformly distributed voids that is subjected to high-pressure steam curing.   Production of AAC Blocks   This is a light- weight building material produced by autoclaving a set mix of fine siliceous materials such as ground silica sand or flyash and the binders like Portland cement and lime. Lightness is achieved by incorporating a large proportion of closed microscopic pores in the slurry with the help of entraining or foaming agent. The basic raw materials are fine-ground sand or fly ash, cement, quicklime, anhydrite or gypsum, water, and aluminum  powder or paste as a rising component. A suitable mixture of these raw materials is poured into a mould, and the rising process starts due to the development of hydrogen gas formed by the reaction of aluminium in the alkaline suspension. After 20 to 40 minutes the maximum rising
38 comments
Read more