Radial mixing of metallurgical slag particles and steel balls in a horizontally rotating drum: A discussion of particle size distribution and mixing time

A large amount of carbon dust is generated in the process of aluminum smelting by molten salt electrolysis. The carbon dust is solid hazardous waste but contains a large quantity of recyclable components such as carbon and fluoride. How to recycle carbon dust more effectively is a challenge in the aluminum electrolysis field. In this study, X-ray diffraction, scanning electron microscope, and other methods were used to analyze the phase composition of electrolytic aluminum carbon dust. The effects of particle size distribution of carbon dust, impeller speed, reagent addition, mixing time, and flotation time on the flotation recovery of carbon dust were studied. The optimal flotation conditions were obtained and the flotation products were analyzed. The results show that the optimal particle size distribution is 70% of particles below 200 mesh, corresponding to a grinding time of 11 min. The optimum speed of the flotation machine was to be between 1600 and 1800 r/min with the best slurry concentration of 20–30% and 5 min mixing time, and the collector kerosene was suitable for adding in batches. Under the above conditions, the recovered carbon powder with a carbon content of 75.6% was obtained, and the carbon recovery rate was 86.9%.

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Preparation of Monodispersed and Nano-Sized Spherical SiO2 Particles by Emulsion Method

Materials Science Forum ◽

10.4028/www.scientific.net/msf.449-452.1161 ◽

2004 ◽

Vol 449-452 ◽

pp. 1161-1164 ◽

Cited By ~ 1

Author(s):

Jong Hwa Baek ◽

Young Soo Kang ◽

Seog Young Yoon ◽

Hong Chae Park

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Mixing Time ◽

Average Particle Size ◽

Average Particle ◽

Amorphous Sio2 ◽

Emulsion Method ◽

Sio2 Particles ◽

20 Nm

Spherical nano-sized SiO2 particles have been synthesized from sodium silicate by emulsion method. The influence of emulsifier content and mixing time on the morphology and particle size distribution of the resulting materials was investigated. The characteristics of the obtained SiO2 particles were examined by means of XRD, SEM, TEM, and PSA. The monodispersed shperical SiO2 with the average particle size 20 nm was obtained at a emulsifer content of 3vol% and mixing time of 60 min using ultrasonic disruptor. After calcining at 1200oC for 2 hrs, the amorphous SiO2 transformed wholly to the crystalline cristobalite. As increase in emulsifier content from 1 to 3 vol% did not nearly influence on the morphology of SiO2 particle but slightly changed the particle size distribution. The average particle size of SiO2 decreased significantly from 100 nm to 20 nm with increasing the mixing time.

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Effect of the Ball Milling on the Microstructure and Mechanical Properties of AlN/Cu Composite

Materials Science Forum ◽

10.4028/www.scientific.net/msf.816.15 ◽

2015 ◽

Vol 816 ◽

pp. 15-20

Author(s):

Qian Yu ◽

Mei Hui Song ◽

Yan Li ◽

Xiao Chen Zhang

Keyword(s):

Thermal Conductivity ◽

Electrical Conductivity ◽

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Ball Milling ◽

Bending Strength ◽

Rotation Speed ◽

Mixing Time ◽

Composite Powders

AlN/Cu composite powder was prepared by ball milling method. Laser particle size analyzer, X-ray diffraction and scanning electron microscopy analysis were performed to study AlN/Cu composite powders. The effects of rotation speed, mixing time, and ball to powder weight ratio (BPR) on the particle size distribution, composition, and morphology were investigated. Results showed that the best ball milling parameters were the rotation speed of 200r/min, mixing time of 6 hours and BPR 10:1. In this best condition, AlN/Cu composite powders would be obtained with optimum particle size distribution and morphology. Then composite powders were pressed at 500MPa and sintered at 1000°C in N2atmosphere. Finally, the composite with an AlN content of 33wt% showed the bending strength of 370MPa, Vikers hardness HV154, thermal conductivity of 182.7W/m°C and electrical conductivity of 3.08MS/m. However, the composite with an AlN content of 25wt% showed the bending strength of 329MPa, Vikers hardness HV122, thermal conductivity of 195W/m°C and electrical conductivity of 6.54MS/m.

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Impact of Particle Size Distribution for Variable Mixing Time on Mechanical Properties and Microstructural Evaluation of Al-Cu/B4C Composite

Materials Today Proceedings ◽

10.1016/j.matpr.2020.02.190 ◽

2020 ◽

Vol 22 ◽

pp. 1715-1722

Author(s):

G.N. Lokesh ◽

S. Karunakara

Keyword(s):

Mechanical Properties ◽

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Mixing Time ◽

Microstructural Evaluation

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The Effect of Grinding Media on Mineral Breakage Properties of Magnetite Ores

Geofluids ◽

10.1155/2021/1575886 ◽

2021 ◽

Vol 2021 ◽

pp. 1-9

Author(s):

Liang Si ◽

Yijun Cao ◽

Guixia Fan

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Production Capacity ◽

Milling Process ◽

Ball Size ◽

Grinding Media ◽

Grinding Conditions ◽

Steel Balls ◽

Different Diameters

The breakage and liberation of minerals are the key to fluidized mining for minerals. In the ball milling process, steel balls function as not only a grinding action implementer but also energy carrier to determine the breakage behavior of ores and the production capacity of the mill. When ground products present a much coarse or much fine particle size distribution, the separation process will suffer, resulting in inefficient recovery of useful minerals. Optimal control of the particle size distribution of the products is therefore essential, but the complexity and randomness of ball mill grinding make it difficult to determine the appropriate ball size. To solve the problem in the precise measurement of grinding ball diameters, this paper carried out magnetite grinding experiments with grinding balls of different diameters under the same grinding conditions to study the influence pattern of steel ball diameters on the particle break behavior, the particle size distribution of ground products, and the mineral liberation degree distribution. The research proposed on the matching relation between the ball size and the quality of ground products is essential for improving the ground product quality and reducing energy consumption.

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