Great Benefit from installing The Kemco Witman in Calcium Carbonate Production Plants by reducing drying cost and CO 2 emissions. “Kemco Witman” Centrifugal Powered Screw Ejecting Dryer 1 Part 1 : Calcium carbonate

1) Wide applications of Calcium Carbonate: Rubber Glass Paper PaintAsphalt filler Plastic 2

2) Typical Calcium Carbonate Production Flow: 3

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

1.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 via front maintenance door. 4) Main features of the Kemco Witman: 5

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

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

脱水成品 Feed Drain Products Heat テーパースリット スクリーン 供給パイプ Working water 7) Mechanism: Basket Screw Inlet pipe Reduction gear Electric Motor WaterProducts Screen 8 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. 2)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.

ScrewScreen 8) Main components: 9

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

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

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

ModelCapacityMotor N-452K5 to 10 t/h15kW N-570-K10 to 20 t/h30kW Maximum permissible feed size is 10mm 12) Model line ups and capacity: 13

13) Dimensions: 14

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