Great Benefit from installing The Kemco Witman in Calcium Carbonate Production Plants by

1. Great Benefit from installing The Kemco Witman in Calcium Carbonate Production Plants by reducing drying cost and CO2 emissions. “Kemco Witman” Centrifugal Powered Screw Ejecting Dryer Part 1 : Calcium carbonate 1

2. Plastic Asphaltfiller Rubber Paint Glass Paper 1) Wide applications of Calcium Carbonate: 2

3. 2) Typical Calcium Carbonate Production Flow: 3

4. 3) Main concepts for Developing the Kemco Witman: 1. Reducing drying cost and CO2 emissions in Calcium Carbonate Production Plants 2.Preferable feed size is <10mm for crushed rock and <5mm for sandy material. 3. Continuous operation. 4

5. 4) Main features of the Kemco Witman: • Continuous operation: Continuous feeding and stable moisture content of product. 2. High dehydration performance (Max. acceleration 1000G) To reduce the moisture content of limestone: 9-5mm material : Down to less than 1.2% 10-3mm material : Down to less than 1.0% 3. An optional heating device is also available. To reduce the moisture to less than 1%. 4. Compact size. 5. Easy maintenance. Easy maintenance viafront maintenance door. 5

6. 5) Process flow: Feed Working water Feed (5.2t/h) + Working water (2.4t/h) Dehydrate by centrifugal power Heat (Optional) Products Heat Centrifugal dehydration Centrifugal dehydration and heater drying Feed Feed Working water Working water Heat Dust Dusty water Dusty water Product Product 6

7. 6) Process flow: Model N452K Main Body Feed Hopper V belt cover Main motor Chute for product Drain pipe Vibration absorbing rubber 7

8. Feed Drain Products 7) Mechanism: Working water Reduction gear Basket Electric Motor Heat 供給パイプ Inlet pipe Screw テーパースリットスクリーン Screen Water Products 脱水成品 • 1)Screw and basket (equipped with screen inside) rotate at high speed (approx. 1,700 rpm) • generating the centrifugal force by which the material is dehydrated. • The screw turns at a slightly higher speed than the basket. The difference of speed • makes screw eject products. Water and small particles come out through screen. • 3) The screen mesh size is 0.2mm to 0.3mm. 8

9. 8) Main components: Screw Screen 9

10. 9) Performance: Feed: Lime stone:5-0mm Model N452K Co-relation: Feed volume (t/h) and moisture content Moisture (%) Heater off Heater on Feed volume (t/h) 10

11. 10) Size distribution: Feed: Lime stone:5-0mm New feed: 5.2t/h, Working water:2.4t/h % Feed Products Fine particle in drain water Sieve mesh size (mm) ※1．JIS A 1102　骨材のふるい分け試験による測定結果 11

12. 11) Comparison – Before & After: Feed: Limestone: 5-0mm FeedProduct Moisture: 10% 1% In addition to a reduction of moisture; Improvement of color, due to elimination of silt, is also noted. 12

13. 12) Model line ups and capacity: Maximum permissible feed size is 10mm 13

14. 13) Dimensions: 14

15. 14) Test plant: A minimum 200kgs of sample feed is required per sample test. Feed hopper Conveyer Hopper Witman Heat inlet Electric motor Chute Air blower Drain pipe Conveyer Model N452K 15