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Within Zorka Keramika two branches are formed: Branch CLAY PIT DONJE CRNILJEVO, Donje Crniljevo and Branch CLAY PIT JADRANKSA LEŠNICA, Jadranska Lesnica.

The most significant advantage of our pits is the facts of having more kinds of clay in one place. According to experts analyses pits abound with reserves and the exploitation will be possible for next 15-20 years more. Considering the fact of having in first 5-10 m exploitation of the clay for brick production, and under - layers of white clay for tile production, clay pits are source of raw material for both brick production and tile production.

All clays in property of Keramika-holding d.o.o. are located in Upper Tamnava Tertiary Basin.

Their mineralogical composition represents mixture of kaolin-ilite-montmorionit clays, that determines their key properties like plasticity, foundry, drying properties, bending strength and color after firing.

Current products:

  • Yellow–red brick-ceramic clay
  • Grey-white ceramic clay
  • Dark brick clay
  • Homogenised clay for floor tiles
  • Kaolinite granit (as welding flux in ceramics)

Application:

  • Rough ceramic: in brick industry, ceramic canalization pipes, pottery;
  • Fine ceramic: wall and floor tiles, toilet ceramics;
  • Other: paper industry, rubber, fertilizers. Raw clay is additionally processed, minced, dried, micronized and milled, in order to be used in above mentioned fields. In certain amount clays are used in refractory products as firebricks, electrical power insulators, etc.

Yellow–red brick-ceramic clay

Main charasteristics:

Moisture by delivery: 17.0 - 19.0 % (depends on seasion)
Rest on the strainer from 63µm: 34.8 %

Chemical composition:

Component Bur. los. SiO2 Al2O3 Fe2O3 TiO2 CaO MgO Na2O K2O
Content % 4.76 71.06 15.08 5.30 1.00 0.25 0.30 0.14 2.11

Mineralogical composition (Rõ analyses): mostly common quartz, minerals from the filosilikate group and smektit group in traces.

Charasteristics and behavior in proces of drying and burning:

  • water needed for plastic processing: 30.25%
  • plasticity by Pfefferkorn: 33.65%
  • shrinking by drying process on 105°C: 6.46%

Klinkering temperature: > 1250°C
Sintering temperature: > 1250°C

Usage:
Mainly for brick industry.

Testing of burning the exploited sample:

Temperature Burning colour (CEC) Tot. shrink. Watter absorbtion Apperance
1250 °C H-9 dark brick red 12.64 % 7.01 % normal
1170 °C G-10 dark brick red 11.48 % 11.59 % normal
1100 °C F-10 brick red 9.57 % 13.92 % normal
1000 °C E-9 dark cream 7.49 % 18.43 % normal
930 °C E-8 dark cream 7.25 % 19.11 % normal

Grey-white ceramics clay

Main charasteristics:

Moisture by delivery: 17.0 - 19.0 % (depends on seasion)
Rest on the strainer from 63µm: 8.59 %

Component Bur. los. SiO2 Al2O3 Fe2O3 TiO2 CaO MgO Na2O K2O
Content % 6.05 65.98 20.79 1.88 1.33 0.34 0.75 0.12 2.48

Mineralogical composition (Rõ analyses): ostly quartz, minerals from the filosilikate group and smektit group in tracs.

Charasteristics and behavior in proces of drying and burning:

  • water needed for plastic processing: 48.80%
  • plasticity by Pfefferkorn: 54.40%
  • shrinking by drying process on 105°C: 9.84%

Klinkering temperature: > 1125°C
Sintering temperature: > 1200°C

Usage:
For ceramics industry, floor and wall tiles with light brick colour.

Testing of burning the exploited sample:

Temperature Burning colour (CEC) Tot. shrink. Watter absorbtion Apperance
1250 °C A-5 light grey 19.06 % 0.59 % normal
1170 °C G-10 dark brick red 18.72 % 2.79 % normal
1100 °C F-10 brick red 18.35 % 7.74 % normal
1000 °C E-9 dark cream 13.88 % 17.01 % normal
930 °C E-8 dark cream 12.06 % 20.62 % normal

Dark ceramic clay

Main charasteristics:

Moisture by delivery: 17.0 - 19.0 % (depends on seasion)
Rest on the strainer from 63µm: 5.96 %

Chemical composition:

Component Bur. los. SiO2 Al2O3 Fe2O3 TiO2 CaO MgO Na2O K2O
Content % 12.09 50.08 29.29 1.51 0.70 1.47 0.73 1.78 0.32

Mineralogical composition (Rõ analyses): mostly quartz, clay minerals and felspats.

Charasteristics and behavior in proces of drying and burning:

  • water needed for plastic processing: 29.70%
  • plasticity by Pfefferkorn: 31.70%
  • shrinking by drying process on 105°C: 6.50%

Usage:
As plastic material it is used for traditional ceramic products with long processes of burning, in refractory products, and as a filler in different industrial areas.

Testing of burning the exploited sample:

Temperature Burning colour (CEC) Tot. shrink. Watter absorbtion Apperance
1100 °C B2/B3 white-cream 8.69 % 14.71 % normal
1000 °C C2/C3 light yellow cream 111.00% 12.35 % normal
900 °C C4 dark yellow cream 14.00 % 9.62 % normal

Homogenised clay for floor tiles

Main charasteristics:

Moisture by delivery: 17.0 - 19.0 % (depends on seasion)
Rest on the strainer from 63µm: 15.0 - 20 %

Chemical composition:

Component Bur. los. SiO2 Al2O3 Fe2O3 TiO2 CaO MgO Na2O K2O
Content % 7.31 61.20 22.66 1.14 0.60 1.17 0.64 0.22 3.71

Mineralogical composition (Rõ analyses): mostly quartz, clay minerals and felspats.

Charasteristics and behavior in proces of drying and burning:

  • water needed for plastic processing: 30.57%
  • plasticity by Pfefferkorn: 32.52%
  • shrinking by drying process on 105°C: 7.55%

Usage:
For ceramics industry, floor and wall tiles with light burned "brick" colour.

Testing of burning the exploited sample:

Temperature Burning colour (CEC) Tot. shrink. Watter absorbtion Apperance
1200 °C C4 dark cream 10.77 % 0.30 % almost sinterned
1100 °C C4 cream 9.49 % 3.56 % normal
1000 °C B3/C3 yellow cream 8.85 % 9.08 % normal
900 °C C1/D1 light cream 5.45 % 15.72 % normal

Kaolinite granit

Main charasteristics:

Moisture by delivery: 6.0 - 8.0 %
Rest on the strainer from 63µm: 75.0 - 85.0 %

Chemical composition:

Component Bur. los. SiO2 Al2O3 Fe2O3 TiO2 CaO MgO Na2O K2O
Content % 3.20 - 4.10 63.0 - 66.0 19.0 - 21.0 1.50 - 1.65 0.20 - 0.23 0.85 - 1.25 0.20 - 0.30 1.75 - 2.70 5.40 - 6.45

Mineralogical composition (Rõ analyses): liskun, quartz, felspats and kalcit/dolomit.

Charasteristics and behavior in proces of drying and burning:

Klinkering temperature: > 1250°C
Sintering temperature: > 1250°C

Usage:
Exclusively as so called welding flux in ceramics industry.

Testing of burning the exploited sample:

Temperature Burning colour (CEC) Tot. shrink. Watter absorbtion Apperance
1200 °C C4 dark cream 5.23 % 11.52 % normal
1100 °C F12 dark brick red 2.14 % 14.87 % normal
1000 °C E10 brick red 1.05 % 17.33 % normal

Contact:

ZORKA-KERAMIKA D.O.O.
Beograd-Novi Beograd
Bulevar Mihaila Pupina 10v/114
e-mail: s.djakovac@zorka-keramika.rs

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Another one of the most prestigious and highest quality ceramics fair in Bologna has finished. "CERSAIE" once again showed all the luxury and splendor presented by the best exhibitors from all over the world.  ZORKA KERAMIKA stand and premium tile collection has shown that it can rival the world's leading ceramic producers. The stand looked impressive, and the energy emitted by this great team was just one of the reasons for staying at the ZORKA KERAMIKA stand. The stand was also visited by a large number of owners of retail stores selling ceramics and commented on the participation of the brand at this fair from its angle. They were fascinated by the very appearance of our brand in this kind of event and as they told us, for them, this is significant from the aspect of quality in the sense that what has been "reserved" for Italy and Spain for years has now been on our soil, something that will "push’’ other manufacturers to make high quality ceramics at lower prices, more receptive to people.  01 In order to stay objective, we asked visitors, to comment on the appearance of our brand in Bologna, and they were very pleased to comment on the performance and compare it with some of the most prestigious exhibitors of ceramics.

Boban Jokic, the owner of "Spectrum Enterier Design" studio for interior design and equipping, visited the fair in Bologna and, of course, visited the ZORKA KERAMIKA stand. His first impression of the TILEZZA brand is most positive. What's more, he said that it was seen that they worked basically on the collection itself, and their efforts, he says, made them competitive with the Spanish and the Italians. He praised the graphic selection of collections and said that the formats, although smaller compared to the Italian ones, look very nice and are ideal for fitting into any interior. boban jokic

As for the general impression and expectations here at the fair, Boban drew attention to the exhibitors from Spain and their efforts to break through the form and decorative elements, an attempt to get colors out of the already seen, while the Italians follow the trend of large tiles, use concrete, wood and Earth tones. As far as TILEZZA is concerned, it foresees a beautiful future for this brand and highlights the effort that the marketing team has invested in the stand itself, praising the energy that their team has.

Nebojsa Tanasković, architect from Belgrade, owner of the company "Nesh projekt", deals with the design of residential commercial facilities and the design and execution of interior works. What attracted him to TILEZZA brand are the trendy look and the ability to use it in larger projects. What is his general impression at the fair is that the Spanish in collections stand out, although it is questioning the commercialism of their ceramics. On the other hand, he points out that the brand TILEZZA is of high quality enough to fit into the offer in Bologna, but also has a commercial line that allows for wider application. Nesa Tanaskovic

His associate, Jelena Radovic, designer of interior, scenographer and painter, also emphasizes the ability of ZORKA KERAMIKA ceramics to be competitive with other producers of the same, but from the point of view of painting technique, they notice their series which, she said, is "shifty" compared to others. According to her, ZORKA KERAMIKA with this new collection presented at the fair, really showed that it has a place among the best in terms of quality and design. Jelena R

So, the general impression is that this fair has responded to the expectations of visitors, and they expected the trend, quality and the best of ceramics.
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    Contact details

    "ZORKA-KERAMIKA" D.O.O.
    Bulevar Mihajla Pupina 10v/1/114
    Beograd-Novi Beograd, 11070
    Republic of Serbia
    +381 (0)15 361-000
    keramika@zorka-keramika.rs

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