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Perlite Bloating Technology

#A-412


Bases of Perlite Rocks Bloating New Theory and Technology; Production of Light-Weight and Higth-Strength Products from Perlite without Using a Foreign Binder

Tech Area / Field

  • MAT-OTH/Other/Materials

Status
8 Project completed

Registration date
27.09.1999

Completion date
25.11.2005

Senior Project Manager
Zalouzhny A A

Leading Institute
Institute of General and Inorganic Chemistry, Armenia, Yerevan

Collaborators

  • Silver & Baryte Ores Mining Co.S.A., Greece, Athens\nFriedrich-Schiller-Universität Jena / Otto-Schott-Institute für Glaschemie, Germany, Jena

Project summary

The goal of the Project is the development of perlite rocks bloating theory and technology new basis. Utilization of heat-insulation materials and products on the basis of bloated perlite softens to some extent the problem of fuel-energy and raw materials resources saving. The bases of perlite bloating processes are not fully studied at present, which results in incomplete use of properties hidden in natural material. To produce lightweight products it is necessary to use binder of organic or non-organic origin together with bloated perlite. In both cases energy costs and products cost are being increased. Perlite bloating processes have different and contradictory interpretation at present, such as:
- In one of the work the author considers that during heating the heat flux front doesn't pass inside the grain at once, therefore peripheral layers bloat first and then deeper ones;
- I.N. Yavits assumes that in case of perlite grain abrupt heating the surface layer looses water quickly, increasing therefore the viscosity of the layer which serves as an elastic film covering the glass main floating mass;
- According to P.P. Budnikov and A.E. Rohvarger pore-formation takes place only when small grains are placed in high temperature area at once where they undergo sharp thermal shock. In case of slow heating gradual water loss occurs without perlite glass mass bloating;
- D. Shackley and M. Alien are of similar opinion. They discovered that small perlite grains bloat while heated at a rate of 9907min;
- N.S. Manujlova has studied the bloating process under microscope and found that it begins at 600 °C with pore-formation in the centre of perlite cell from where the process is being spread all over perlite full;
- Another approach was presented by E. Saakyan: she added 4.5-9.3 mass % of sodium oxide (in form of NaOH), that reduced the mixture viscosity by combining the mass pyroplastic state with gas component evolution. In this case the production of cellular material is getting possible by cellular glass technology. Consequently, adding of alkali into the raw material will cause rise in price of the produced light-weight material and will reduce material heat resistance from 950° to 600°C. We consider this not the best problem solution.

The following problems will be solved as the results of Project implementation:


- creation of perlite rocks bloating new theory and technology;
- designing of new large-scale laboratory production line to produce light-weight products from perlite without using a foreign finder;
- reorientation of highly qualified personnel on peaceful problems solution; scientists integration into the international scientists society;
- assistance in solving international and national problems in seismostable construction and fuel-energy and raw material resources saving.

The following experts participate in Project implementation:

Doctor of Technical Sciences: 2 experts

Candidates of Technical Sciences: 4 experts.

Thus, a completed theory, explaining the bloating processes and allowing to fully use the rock properties, as well as to produce heat resistant and high-strength light-weight products without using a foreign finder is not available at present.

It is envisaged under the Project to perform scientific and research works on revealing the floating processes mechanism, establishing the process line new theory and scheme for production of high-strength light-weight products from perlite rocks with high operating temperature at large-scale laboratory installation without using a binder and with controllable structure and properties. It will allow to widen the raw material basis, to reduce the cost of light-weight products manufacturing and to expand their utilization areas, as well as to open a great perspective of glass rocks bloating technology improvement with further products cost reduction by simplifying and automating the technological processes.

The Manager of the Project, Varuzhanyan A., defended a thesis in chemical - Technological Institute after Mendeleyev D.I. in 1967 in Moscow on a subject "Investigation of water vapors influence on perlit rocks viscosity and bloating at softening interval under increased pressures " which he had been performing under guidance of the USSR Academy of sciences member-correspondent USSR A.S. academician Pyotr Petrovich Budnikov.

The Other Scientific workers and engineers are highly qualified. They dealt with investigation of volcanic glassy rocks porization structure and conditions.

The activity of the group consists mainly of founding perlite rocks bloating new theory and of drawing up new theory bases for obtaining high-strength lightweight products from perlite without a binder.

What refers to foreign collaborators role, in addition to the foreseen in "Instruction on the proposals preparation" from 09.10.1998, participation is desired in testings of the new technology and especially when obtaining light-weight highstrength products from fine-dispersed powoler (less then 150uJtm), which forms during perlite rock grains production. If desired, they can participate themselves or jointly with others on share bases in the implementation of the new technology into the production of lightweight high-strength products from perlite rocks.

The Project conforms completely to the tasks and purposes of 1STC.


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The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.

 

ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.

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