Dastgir
108 posts
TimePosted 15/04/2009 04:00:32
Dastgir says

Acid Insoluble Residue

Dears,

What is Acid Isoluble Residue.

How to find this?

What is its importance?

 Regards,

Gulam Dastgir

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Michael Clark
312 posts
TimePosted 15/04/2009 09:05:04

Re: Acid Insoluble Residue

Acid insoluble residue is a standard laboratory test for cement. All the clinker in cement is soluble in acid  it is a measure of proportion of the non-clinker material in cement. Usually clay minerals added with the gypsum. In CEM 1 or pure Portland cements it is a measure of the added filler. It has less meaning with blended cements such as CEM 2.  

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Dastgir
108 posts
TimePosted 16/04/2009 16:04:47
Dastgir says

Re: Acid Insoluble Residue

Dear Michael ,

 My inquiry is in reference to Rawmix.

Sincerely Yours,

Gulam Dastgir

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ovancantfort
57 posts
TimePosted 20/04/2009 12:59:33

Re: Acid Insoluble Residue

In the rawmix, the acid insoluble residue can give an approximation of the crystalline silica content. Cyrstalline silica being very refractory and diffciult to combine, it is important for assessing the burnability of the raw mix. To get an accurate measurement of crystalline silica content, one should use microscopy, which is a difficult and time-consuming process. This is why acid-insoluble residue is often used as an approximation.

To assess burnability, the acid insoluble residue should be determined on different sieve residues. It is generally admitted that crystalline silica particles > 50µm will not combine completely.

As an example, here is a formula from FLS institue to assess burnability:

(Free Lime at 1400°C) = 0.35*(LSF-96) + 1.58 (MS-1.6) + 0.55 * (Acid insoluble residue > 45µm) + 0.12 * (total residue > 125µm)

 

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