12 replies to this topic

[Valli25]

Magnesium hydroxide is manufactured from dolomite. The yield of magnesium hydroxide is 65-80%. The theoretical yield from 1 kg of folomite is 1.2 kg of magnesium hydroxide.0.8 kg of calcium chloride is produced from 1 kg if magnesium hydroxide

[Art Montemayor]

Valli:

Your ability to communicate is terrible. Our members have to try to decipher what you are trying to say. All I can “de-code” is that you have an assignment to calculate “something” related to manufacturing 20 tonnes/day of magnesium hydroxide.

What – specifically – you have been asked to calculate is something you are not telling us. Please explain.

What specific work have you done up to now on this assignment? Please present it in a spreadsheet format for our members if you want our Forum to help you in any specifics you may not understand. Be detailed and prepared to explain your entire problem, complete with basic data.

In the future, do not attempt to explain your problem in the title of the thread. That is not what the title is meant to convey.

[Valli25]

Magnesium hydroxide is manufactured by the brine process using dolomite(calcinations product of dolomite ) and brine in a slaking reactor. Clarification following thickening maximizes recovery of solids. Under flow slurry from the thickener is dewatered and washed in rotary drum filter and repulped to produce magnesium hydroxide of high bulk density and high purity. Approximately 65 to 80% of the total magnesium hydroxide yield is formed in the slaking reactor. Theoretical yield from 1 kg of dolomite is approximately 1.2 kg of magnesium hydroxide,excluding impurities may be chosen. And also consider 0.84 kg of byproduct calcium chloride is produced per kg of magnesium hydroxide for material balance calculations.flocculant is added in the thickener to improve the settling and filtering characteristics. Recirculating of a fraction of the precipitated slurry into the thickener improves the settling rate.

[breizh]

Valli,

We certainly will help you if you show us what you have done, what you understood, and the difficulties you are facing.

Somewhere there is similarity with the process of slaking quicklime to produce milk of lime. I'm sure doing google work you will find a lot of information.

http://www.mcilvaine...mfg process.htm

Anyway, you need to provide mass and heat balances. The slaking process will generate heat.

Hope this helps you

Breizh

Edited by breizh, 09 October 2012 - 10:46 PM.

[Art Montemayor]

OK Valli, now we know that you can "cut-and-paste" words from a problem that has probably been assigned to you. But you still fail to cut-and-paste the part that tells you what is being asked of you to resolve a presumed problem.

We professional chemical engineers know very well what dolomite is and how the magnesium hydroxide process should work. Our forum members are here to try to help you. We can't help you if you don't communicate what your problem is and submit all the information I specified previously.

A constructive and positive response would help. Otherwise, we can't help.

[Valli25]

I had given whatever the information given. I just want to confirm what are the process available and which is the best process? Why?

[vis1979]

i have been completed mass and energy balance but confused in design of thickener as suufucient data are not available. after many recerch i want to get data about settling velocity data for Mg(OH)2 slurry in a thickener. Many data are available in kirk-othmer and perry. but still something is missing also rotary filter data like drum area and rpm of filter make a confusion. please help me to provide such data. thanking you

[ACKR201]

20 TPD Mg(OH)2 by brine

[vis1979]

how
can help me from your answer "20 TPD Mg(OH)2 by brine". please specify and help. Thanks.

[shineanoop1985]

please give me the project details for me also.

[hads24]

Magnesium hydroxide is manufactured by the brine process using dolomite(calcinations product of dolomite ) and brine in a slaking reactor. Clarification following thickening maximizes recovery of solids. Under flow slurry from the thickener is dewatered and washed in rotary drum filter and repulped to produce magnesium hydroxide of high bulk density and high purity. Approximately 65 to 80% of the total magnesium hydroxide yield is formed in the slaking reactor. Theoretical yield from 1 kg of dolomite is approximately 1.2 kg of magnesium hydroxide,excluding impurities may be chosen. And also consider 0.84 kg of byproduct calcium chloride is produced per kg of magnesium hydroxide for material balance calculations.flocculant is added in the thickener to improve the settling and filtering characteristics. Recirculating of a fraction of the precipitated slurry into the thickener improves the settling rate.
1.material and energy balance
2.design of thickner
3.design of rotary drum filter
pls help me to understand & guide me how to do it.i will be thank ful

[Art Montemayor]

All Students:

If you want or need to participate in this thread, please read and heed the advice given in Posts #2, 4, & 5.
I don't think we can respond any clearer and directly than we already have.

Thank you.

[Valli25]

Sir please help me regarding laboratory sedimentation reports of magnesium hydroxide slurry