Jet mill

About: Jet mill is a research topic. Over the lifetime, 803 publications have been published within this topic receiving 5686 citations.

Method for preparing graphene micro-sheets by using counter-jet jet mill

Abstract: The invention relates to the field of graphene materials, particularly relates to preparation methods for graphene micro-sheets and particularly relates to a method for preparing the graphene micro-sheets by using a counter-jet jet mill. According to the method, the graphene sheets are obtained through enabling melted ferric chloride and potassium chloride to enter an interlayer of graphite, enabling the powder materials to be in collision through high-speed airflow in the counter-jet jet mill by using the characteristic of brittleness of ferric chloride and potassium chloride crystal grains and the characteristics of good fluidity and difficulty in agglomeration of talcum powder, delaminating the graphite and the talcum powder by generated impact force, shearing force and frictional force, carrying out further separation by a grading room, refluxing unqualified powder material to a crushing chamber, and yielding delaminated graphite and talcum powder as well as gas together. The continuous and large-scale production of the graphene micro-sheets, which are uniform in layer number dispersion and good in fluidity and are not prone to agglomeration, is achieved, the yield is high, the cost is low, no pollution is caused, and the layer thickness meets the requirements of use in the fields of rubber reinforcing, plastic reinforcing, coating material anticorrosion, lubrication and sewage treatment, so that the promotion of the large-scale application of graphene is facilitated.

Nano pearl cream

Abstract: A topical application comprises cultured pearl powder of particle size ranging between 0.4 μm and 1 μm ground by an ultrasonic gas jet mill, and purified water suspending the cultured pearl powder.

A new solution to enhance cuttings transport in mining drilling by using pulse jet mill technique

Abstract: In horizontal drilling, the cuttings bed is frequently formed to result in severe problems such as backing pressure, binding of bottom hole assembly (BHA) and even sticking of tool. Practice and research show that the smaller particle size is, the more favorable to carry out from bottom of hole in extended reach well or horizontal well. This paper presented a new solution to enhance cuttings transport in mining drilling through a new type of bit called pulsed mill bit (PMB) by using pulse jet mill technique. It provides a promising solution to enhance the efficiencies of rock breaking and cuttings carrying for pulsed jet, sucking cuttings to decrease the chip hold down effect, and reducing cuttings’ diameter to eliminate cuttings bed. The design was supported by the calculation models of Helmholtz resonator natural frequency, optimal drilling fluid flow rate of resonator, drilling fluid flow velocity in forward jet channel, critical impact velocity of cuttings and minimum length of the accelerating cavity. Meanwhile, factors affecting optimal drilling fluid flow rate, critical impact velocity of cuttings and minimum length of accelerating cavity were investigated. Case study showed a good consistency between the calculation results and the related theories. It is concluded that optimal drilling fluid flow rate increases with the increase of inlet and outlet cavity’s diameter, and decreases with the increase of the diameter of the resonant cavity. Critical impact velocity of cuttings increases with the energy conversion factor (β) and ROP, while decreasing with the final size of the cuttings (dt). This effect is obvious when β<0.2, ROP <3.048 m h−1 and dt<0.3 mm. Minimum length of the accelerating cavity decreases with the increase of the resonator’s natural frequency and separation coefficient (α) of drilling fluid flow rate. This study provides a promising solution to remove cuttings bed in horizontal well.