Bidirectional tosh grinding ultra-fine crashing objects and its method

A technology of ultra-fine crushing and two-way rotation, which is applied in grain processing and other directions, and can solve problems such as unguaranteed safety issues, prone to combustion or explosion, and danger of heating the cylinder, so as to reduce energy consumption, shorten production time, and reduce production costs. Effect

Inactive Publication Date: 2008-04-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As we all know, it is very difficult to ultrafine the above materials in a dry state. The main technical problem is that these materials are hard and tough. At present, the existing ultrafine technology and equipment in China cannot provide strong impact force and strong shear force at the same time. , strong friction and strong extrusion force, so it cannot be ultrafine; in addition, when these materials are ultrafinely pulverized in a dry state, the fine particles are very easy to stick to each other and agglomerate and grow again (called reverse crushi

Method used

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  • Bidirectional tosh grinding ultra-fine crashing objects and its method
  • Bidirectional tosh grinding ultra-fine crashing objects and its method

Examples

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Embodiment 1

[0026] Embodiment 1: the production of superfine flaky aluminum powder: spherical spray aluminum powder (mean particle diameter d 50 = about 20 μm) into the two-way rotating ball mill ultra-fine grinding equipment with a volume of 800L in cylinder body 1, the feeding amount is 200kg, and adding stearic acid accounting for 5% of aluminum powder weight as surface coating agent, grinding ball 17 (stainless steel The amount of steel ball) is 1 ton, and the following gradation is selected, that is, Φ5~10mm: 45%, Φ10~20mm: 35%, Φ20~30: 20%, the rotation speed of cylinder 1 is 70 rpm, and the rotation speed of inner rotating shaft 7 The motor power is 40 rpm, the motor power is 30kW, and the cooling water is passed through the cylinder jacket 13 during the production process, and the spherical aluminum powder can be ultra-fine after 4 to 5 hours of crushing to an average particle size of d 50 <3 μm flake aluminum powder, then immediately put it into the airtight receiving bin 14, and...

Embodiment 2

[0027]Embodiment 2: production of superfine oak wood charcoal powder: the oak wood charcoal stick (Φ=5cm) that length is 20cm is broken into the charcoal particle of about 10 orders by rough crushing process, for avoiding the mixing of a small amount of large particles (more than 5mm), coarse Coarse screening must be carried out after crushing to ensure that the particle size of coal particles entering the subsequent fine crushing process is basically uniform, so as to reduce fine crushing time, reduce energy consumption, and improve production efficiency and product uniformity. Coarsely pulverized charcoal particles are finely pulverized using the two-way rotating ball mill pulverization technology, and the corresponding equipment with cylinder body 1 of 800L is selected, the feeding amount is 350kg each time, and the consumption of grinding balls 17 (bearing steel balls) is 1.25 tons. The following grades are selected: Matching, that is, Φ20~30mm: 20%, Φ30~40mm: 30%, Φ40~50: ...

Embodiment 3

[0028] Example 3: Production of superfine rubber and plastic filler—coal-based composite functional powder: use impact crushing techniques such as jaw crushing to crush coal lumps (Φ=15cm) into coal particles with a diameter of 10 mesh, and pass through a 10 mesh drum Sieve and sieve, and the undersieve is added to the two-way rotating ball mill for fine crushing. The cylinder 1 has a volume of 2000L and is equipped with 4 tons of grinding balls 17 (bearing steel balls), and its gradation is: Φ20~30mm: 20%, Φ30~40mm: 30%, Φ40~50mm: 50%, the ball-to-material ratio is 10:1, ball milling at a speed of 60 rpm for cylinder 1 and 35 rpm for inner rotating shaft 7 After 1 hour, the powder can be unloaded and placed in the airtight receiving bin 14 at the lower end of the ball mill, sieved through an 80-mesh vibrating sieve, the undersize is stored, and a small amount of oversize is returned to the two-way rotary ball mill crushing equipment for further pulverization. The fine powder ...

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Abstract

The present invention discloses a bidirectional-rotating ball-milling ultra-fine crushing device and the method thereof. The device is arranged with a jacket which is provided with cooling water; a closed material storing warehouse which closes the feeding/discharging material opening is arranged at the lower end of the barrel body; a vacuum pumping valve which is connected with the vacuum pumping device is arranged at random feeding/discharging cover plate on the barrel body; and an inner lining is arranged at the inner surface of the barrel body. The bidirectional-rotating ball-milling ultra-fine crushing method is doing vacuum pumping to the inner side of the barrel body and actuating the transmission device to do ultra-fine crushing when the raw material above 80 mu is added into the barrel body, wherein the rotary speed of the barrel is 40 to 70 rotation/minute and the rotary speed of the inner rotating axle is 20 to 40 rotation/minute; the mass of the grinding ball gradation phi between 5 to 10mm accounts for 35% to 55% of the total grinding ball mass, phi between 10 to 20mm accounts for 25% to 35% of the total grinding ball mass and the phi between 20 to 30mm accounts for 20% to 35% of the total grinding ball mass; and the mass ratio of the material ball is 1:4 to 1:15. The invention has the advantages of short producing time, low energy consumption and reduced producing cost, and the invention overcomes the fine particle problems of easy aggregation to block and fusing-aggregation, etc.

Description

A technical field [0001] The invention belongs to the superfine pulverization technology, in particular to a bidirectional rotating ball mill superfine pulverization device and method for hard, tough, inflammable and explosive special materials. Two background technology [0002] At present, the military and civilian fields urgently need to superfine many special materials that are hard, tough and flammable, such as Qinggang charcoal, sulfur, oxidizer, RDX, ignition agent, adamantine, red phosphorus, metal silicon, aluminum, magnesium, copper, iron , quartz stone, strontium titanate, polishing powder and Chinese herbal medicine Ganoderma lucidum, etc. for dry ultrafine (micron or nanometer in a dry state) or wet ultrafine. [0003] As we all know, it is very difficult to ultrafine the above materials in a dry state. The main technical problem is that these materials are hard and tough. At present, the existing ultrafine technology and equipment in China cannot provide strong...

Claims

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Application Information

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IPC IPC(8): B02C17/00B02C17/18B02C17/22B02C17/20B02C25/00
Inventor 李凤生刘宏英姜炜顾志明邓国栋杨毅宋洪昌
Owner NANJING UNIV OF SCI & TECH
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