Topic
Jet mill
About: Jet mill is a research topic. Over the lifetime, 803 publications have been published within this topic receiving 5686 citations.
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TL;DR: In this article, the interaction distance between an alumina colloid probe and sapphire surface is about two times larger in wet jet milled slurry supernatant compared to the just ball milled one.
Abstract: In a recent paper by Omura et al.,1) wet jet milled α-alumina slurries exhibited distinctly different stability behavior compared to ball milled ones in terms of re-flocculation efficiency, rheological properties and packing density. The distinction was attributed to the different behavior of the same NH4 + salt of poly(acrylic acid) in the two milling methods used. Force measurement via colloid probe method in the centrifuged supernatant of the milled slurries confirmed that the interaction distance between an alumina colloid probe and sapphire surface is about two times larger in wet jet milled slurry supernatant compared to the just ball milled one. This result confirmed that processing variables do affect the polyelectrolyte behavior in the slurry. The net force was always repulsive on approach in either supernatants.
3 citations
Patent•
19 Sep 1988
TL;DR: In this article, a graphite material is converted into high-purity fine graphite powder by pulverization and high-temperature halogen gas treatment, and the material is treated as follows.
Abstract: PURPOSE: To efficiently obtain high-purity fine graphite powder with ≤50ppm impurity content by roughly crushing a graphite material, subjecting the crushed material to highly purifying treatment with a high-temperature halogen gas and finely pulverizing the resultant material in a jet mill. CONSTITUTION: A graphite material is converted into high-purity fine graphite powder by pulverization and high-temperature halogen gas treatment. In the process; the material is treated as follows. That is the graphite material is initially roughly crushed and then subjected to highly purifying treatment with the high-temperature halogen gas. The roughly crushed material after the highly purifying treatment is then finely pulverized into particles having ≤1μ average particle diameter by pulverization with a jet mill to afford the objective high- purity fine graphite powder. Although the jet mill includes two types in which raw materials are made to mutually collide using jet air streams and the raw materials are blown onto a collision plate with the jet air streams, a mechanism belonging to the former type is preferably used. COPYRIGHT: (C)1990,JPO&Japio
3 citations
Patent•
24 Nov 2017
TL;DR: In this article, a high-temperature cyclic nitrogen protection crushing and grading production line is proposed to ensure that an obtained product is smooth in particle size distribution, regular in shape, high in activity, excellent in dispersibility, free from such pollution as metals and oxides, and high in purity and meets the requirements of a lithium ion battery material.
Abstract: The invention provides a high-temperature cyclic nitrogen protection crushing and grading production line, which ensures that an obtained product is narrow in particle size distribution, smooth in particle surface, regular in shape, high in activity, excellent in dispersibility, free from such pollution as metals and oxides, and high in purity and meets the requirements of a lithium ion battery material. The high-temperature cyclic nitrogen protection crushing and grading production line comprises a bin loaded with to-be-crushed particles, wherein the outlet of the bin is connected with a crushing area of a fluidized bed jet mill; the crushing area of the fluidized bed jet mill is connected with a grading area; the grading area returns coarse particles not satisfying the requirement on the particle size back to the crushing area to be continually crushed, and fine particles satisfying the requirement on the particle size enter the inlet of a dust collector together with airflow; a material outlet of the dust collector is connected with end product packaging equipment; a non-material outlet at the upper part of the dust collector is connected with the inlet of a first filter; the outlet of the first filter is connected with the inlet of a dryer; and the outlet of the dryer is connected with an admission opening of a compressor.
3 citations
Patent•
28 Mar 2003
TL;DR: In this paper, the NiCl2 solution is neutralized with NaOH and the resultant Ni(OH)2 is subjected to dry-type reduction at 420-480 degC using H2 gas into the nickel powder.
Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing nickel powder by which particles of >=3 μm particle size can be further decreased in a process where Ni(OH)2 is reduced by H2 gas to obtain nickel powder of superior crystallinity SOLUTION: In the method for manufacturing the nickel powder free from coarse particles, NiCl2 solution is neutralized with NaOH and the resultant Ni(OH)2 is subjected to dry-type reduction at 420-480 degC using H2 gas into the nickel powder In this method, equipment combining a jet mill with a classifier is used, and agglomerated particles are deagglomerated using the jet mill and classification is carried out using the high-speed rotor type classifier in a non- reagglomerated state directly after the deagglomeration
3 citations
10 Dec 2018
TL;DR: In this paper, the authors presented the ways of modifying Portland slag cement with ultrafine substance for increasing its early strength by using an acoustic cavitation to stabilize water and water-polymer slag suspensions.
Abstract: The paper presents the ways of modifying Portland slag cement with ultrafine substance for increasing its early strength. Blast-furnace granulated slag was used as ultrafine component having been preliminary ground in a laboratory airflow jet mill under restriction of upper limits of grinding to particle size of 1 μm. The obtained ultrafine slag was added into Portland slag cement in the dry state by dry blending and then in the suspension state instead of mixing water. Slag suspensions were prepared in water and water-polymer dispersion media. Plasticizer based on polycarboxylate resins was used as a stabilizer. Acoustic cavitation was used to stabilize water and water-polymer slag suspensions. The comparison of physical-and-mechanical and structural characteristics of modified samples detected that introducing slag suspension stabilized with plasticizer and acoustic cavitation instead of mixing water shows better efficiency. The effect of electrostatic factor is based on the formation of a double electric layer with the participation of functional groups of plasticizer at the surface of slag particles. The effect of structural-mechanical factor is conditioned by the formation of gelatinous films of main chain radicals on the surface of slag particles. Additionally, the stabilization of slag particles is provided by side branches of the plasticizer main chain, creating a spatial effect. Acoustic cavitation applied to water-polymer slag suspension results in the strengthening of electrostatic and structural-mechanical factors of aggregative stability and homogeneity of the suspension. The uniform distribution of stabilized slag particles in the hardening system leads to concentration of new formations on its surface and production of solid and firm structure of cement stone.
3 citations