Reverse detonation
[Procedures] Article 352 When millisecond blasting is used in the mining face of a high gas mine, if reverse detonation is used, safety technical measures must be formulated. [Executive Note] When the reverse blasting of the milliwatt blasting in the mining face of the high gas mine is reversed, the following regulations must be observed: (A) must be compatible with the grade of gas, coal mining product qualification permissible explosives, electric detonators mine allowable delay in milliseconds and coal allowable total delay time digital electronic detonator shall not exceed 130ms. (2) The mine allows the millisecond detonator to conduct conduction inspection before leaving the warehouse. (3) The blasthole sealing mud strictly implements the provisions of Article 359 of the Regulations. (4) The arrangement of the blasthole, the depth of the blasthole, the amount of charge, and the order of detonation must strictly follow the provisions of the blasting instructions. (5) Before blasting, the blaster must perform a full resistance check on the electric blast network using a special instrument that obtains a safety sign. Taper Double-Screw Spiral Mixer
Taper double-screw spiral mixer Overview:
Through revolution and rotation of the screw, the materials make complex movements in the cone, which mainly include the four movement types:
â—The screw makes revolution along the walls to make the materials make circumferential movement along the conical walls.
â—The screw makes rotation to make the materials rise along the screw from the conical bottom.
â—The screw makes revolution and rotation to make some of the materials absorbed into the cylindrical surface of the screw. Under the centrifugal force produced due to rotation of the screw, some of the materials in the cylindrical surface of the screw are discharged radially towards the cone.
â—The rising materials fall due to their gravity. The four movements produce convection, shearing and dispersion in the mixer so as to realize the purpose of fast and even mixing.
Application:
It is widely used for mixing, reaction, drying and cooling of powders and powders (solid-solid), powders and liquids (solid-liquid) and liquids and liquids (liquid0liquid) in such industries as chemical industry, medicine, pesticide, dye, petroleum, metallurgy, building materials, etc.
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