What problems should be paid attention to when designing the main chute?

        1 The number of main chutes should not be less than two in the mines with complex engineering geology, hydrogeological conditions or annual circulation of more than 1000 kt .
        2 The main chute should be vertical, the single-segment vertical height should not be greater than 200m , the branch inclined chute should be more than 60° ; the chute diameter should not be less than 5 times the ore maximum block , but not less than 3m ;
        3 The main chute loading chamber shall be provided with a special safety passage;
        4 The main chute should be equipped with special ventilation and dustproof facilities, and the dirty air should be introduced into the return air passage;
        5 The ore with high mud content, large cohesiveness or high sulfur content and easy to oxidize and self-ignite should not be used.

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