Skip to main content

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.

These particles are drawn by suction, through a collecting duct placed above the nozzle and eventually into a cyclone collecting system.

The particle size are often controlled to some extent by varying nozzle opening atmospheric pressure , etc. 

The different sizes of Aluminium powders are segregated by sieving.

Then packing is done in required quantities and as per the customer requirement.

 The Process Flow Chart is as under:

 Aluminium Ingots

Melting

Spray Atomisation

Collection Chamber → Dust Collector

Coarse Powder Fine Powder

Sieving

Packing

Despatch

Role of Aluminium Powder in AAC

Aluminium acts as pore (cellular structure) forming material and the density of AAC Block is controlled by the input of aluminium.

After pouring of aluminium suspension into the alkaline mixture hydrogen gas is developed.

When aluminium is added (usually at about 0.3% to 0.7% by dry weight of cement) to the mixing ingredients, it reacts with hydroxide of calcium or alkali which liberates hydrogen gas (3H2) and forms bubbles.

The rate at which the air bubbles form is critical to the final product of aerated block.

2 Al + 3Ca (OH)2 + 6 H2O ------> 3 Cao.Al2O3.6H2O + 3H2

Steam water or condensed hot water from autoclave also contributes to the gas development in the reaction.

A lot of pores are formed and the cake is rised until the mould is filled.

This process is influenced by the viscosity of the mixture and the temperature development in the mixture.

According to the intended AAC density class different types of aluminium powder or paste with different particle sizes have to be used, which will be discussed later in other post.

Value of active aluminium content in Metal powder – approx.. 95%

Value of active aluminium content in Metal Paste – approx.. 80%

Care should be taken in storage life of the aluminium. Please confirm with the supplier regarding the same.

 In general, Maximum storage life of Powder is 1 year and Maximum storage life of Paste is 6 months.

 Please read theother post regarding the safety instructions of the material.

 Detailed requirements of Aluminium Powder is given in the Book “PROCESS CONTROL - NUTS AND BOLTS OF AAC BLOCKS MANUFACTURING”

Comments

  1. You have a genuine capacity to compose a substance that is useful for us. You have shared an amazing post about Aluminium Tread PlateMuch obliged to you for your endeavors in sharing such information with us.

    ReplyDelete
  2. We are really grateful for your blog post. You will find a lot of approaches after visiting your post. I was exactly searching for. Thanks for such post and please keep it up. Great work
    Metal Fabrication

    ReplyDelete
  3. Wow! Thank you! I constantly wanted to write on my site something like that. Can I take a portion of your post to my website? Best aluminium windows in south africa service provider.

    ReplyDelete
  4. You've shared some excellent material. I'm grateful for this post because it contains a lot of useful information Precision Casting Parts Online. Thank you for sharing this piece of writing.

    ReplyDelete
  5. I am attracted by the info which you have provided in the above post. It is genuinely good and beneficial info for us Laser Cutting Company. Continue posting, Thank you.

    ReplyDelete
  6. You composed this post cautiously which is beneficial for us. I got some different kind of information from your articlepost something about Custom Plastic Extrusion
    I will suggest reading this article who need this info. Thanks for share it.

    ReplyDelete
  7. Thank you for providing me with such valuable information about custom made metal stairs in new york. This article provided me with some useful knowledge. Continue to make posts like this.

    ReplyDelete
  8. I agree with a lot of the points you made in this article. If you are looking for the seamless steel pipe suppliers in india, then visit Siddhagiri Metals & Tubes. I appreciate the work you have put into this and hope you continue writing on this subject.

    ReplyDelete
  9. Thanks for shared that blog with us. If anyone here searching alloy steel flanges then visit Victor Steel.

    ReplyDelete

  10. Hi there to everyone, the contents present at this web page are actually amazing for people knowledge, well, you can also visit A335 P9 for more Rexal Tubes related information and knowledge. Keep up the good work.

    ReplyDelete
  11. Really helpful down to the ground, happy to read such a useful post. I got a lot of information through it and I will surely keep it in my mind. Keep sharing. If you are looking for some useful data and information regarding 254 SMO Pipe suppliers then visit Perfect Impex.

    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

3 Books you should not miss if you are from AAC Blocks Industry

  3 Books you should not miss if you are from AAC Blocks Industry 1.       AAC Blocks for Superior Masonry Construction Description: This book will introduce you to the world of Autoclaved Aerated Concrete blocks. The AAC blocks have taken the construction industry by storm within the last decade. But there are variety of questions within the mind of users. This book is an attempt to answer them. It will teach you step-by- step how to construct a masonry wall with these wonderful blocks. The bonus section of the book will assist you learn the provisions of IS code 2185 in only 8 minutes! The book also will discuss exact cost savings achieved by the AAC blocks. About the Author: Mukund Joshi He is a concrete technologist by profession and an orator — having lectured in additional than 10 countries within the field of concrete technology. He has worked on numerous international projects designing a concrete mix. He has consulted on numerous AAC plants on  er