We use pure basalt without any additional components (dolomite and limestone) for the high-quality basalt fiber production. It provides the material with unique properties.
The raw materials we use in production to create high-quality mineral basalt fiber must comply with the following requirements of the company:
- sufficient fluidity and relatively high amount of oxides in the chemical composition, performing glass forming functions;
- quite rapid transition of the raw material to the smelt without a trace of the original crystal phase;
- stability of the mineral and chemical composition of the raw material;
- composition of the raw material fraction 1-5 mm.
The rocks that satisfy these requirements are basalt, porphyry, diabase, amphibolite, dolerite, gabbro and their derivatives. Qualitative deviations in their chemical composition generally are not too large, and this allows using them as one-component raw materials for high-quality mineral wool manufacturing.
The chemical composition of the initial smelt should contain basic oxides in the following approximate range (%):
|SiO2||Al2O3||FeO + Fe2O3||CaO||MgO||MnO||TiO2|
|45.0…52.0||10…20||10…18||7…17||3…12||1…3||Less than 3|
Binding feedstock components are oxides of calcium and silicon, while oxides of magnesium, manganese or aluminum can be absent in the chemical composition of the smelt. The "Magma Industry" company uses basalt charge from Janowa Dolina field, which fully satisfies the above criteria.
Below you can see the chemical composition of the batch we use:
|51.56||15.49||10.43||4.42||8.5||5.22||0.2||2.1||less then 3|
Besides, the radiation hygiene test center of Rivne regional sanitary-epidemiological station has found that raw materials and products of the "Magma Industry" company absolutely satisfy all the requirements NRBU-97 (radiation safety norms of Ukraine) and DBN-97 (state building code of Ukraine) (1 class - Aef <370 Bq / kg). According to the certificates 819-BE and 605-BE, batch and finished products tests have Aef = 31 ... 32% ± 25 Bq / kg. The way of rock fusion using electromagnetic induction technology gives the "Magma Industry” company the possibility to produce thin and super thin basalt fiber of potentially suitable basalts from many fields all over the world (including the CIS fields), but these fields are unpopular because of the relatively high content of high-melting impurities, whose melting temperature is 400-600 ° C more than the melting temperature of the smelt produced by our company. Due to high temperatures in the crucible and active basalt smelt mixing by electromagnetic force, the heat resistant basalt melts and liquefy. The rocks that are suitable for the production of mineral fibers by flame method (gas fusion technology) are not always suitable for induction furnaces which operate in high frequency ranges because of the high levels of foaming and gas emission while melting. Foaming makes it more difficult to load the furnace with required charge fraction (1-5 mm), and an active gas emission in some cases can create the conditions for a volcanic ejection of the smelt in the induction furnace. Moreover, some of the rocks can produce a lot of harmful gases while melting, which can negatively affect the health of the staff and employees. These are the reasons why raw materials must be investigated not only by standard procedure, but also in a high-frequency heating by electromagnetic induction before making the final decision on the use of a particular rock for its application in the technology. [/mp_text] [/mp_span] [/mp_row]