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Brick quality

•    Porosity: 23%

•    Watec absorptfon: 12 %

•    MechanlcalMrcngih: 8.S fYPa

Isolation bricks

Brick ma king

Coal flotatłon

Coal qualitY

CV(BTU/lb):> 13500 Car bon: > 90 % Sułfur:*l%

Powerthermal plants

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Bnck maklng

Brick quality

•    Porosity: 19 %

•    Watci .>6%orpt:on ; 10 %

•    Mecbanica^ strength: 17 MPa

High mechanical strcngth bricks

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Figurę 7.13 Simplified scheme illustrating the main proposed scenarios to best manage coal minę wastes in a sustainable and eftlcient way.

7.4 Conclusion

The feasibility to recover coal and produce tlred bricks from coal minę waste rocks was im estigated in this study. After a thorough characterization of raw materials, conducted laboratory tests conflnned the feasibility of reusing coal minę waste rocks from Jerada city (Morocco) for the production of two value added products. The first one consisted of fine anthracite coal with a calorific value of morę than 13 800 BTU/lb, sulfur content less than 1%, and ash content less than 10%. The second one consisted of high qualitv llred bricks containing up to 100% of coal wastes (CMWR and TCMT) which were in agreement with ASTM reąuirements. It was found that it was possible to produce bricks from TCMT samples with higher mechanical strcngth than the reference brick. From an em ironmental point of view, the coal recovery by lroth flotation resulted in a signiticant reduction of CO: and SO: emissions by 79.76% and 67.92% respectively. Also, the amount of lcached metals from monolithic and ground