An Evaluation of the Physicochemical Properties of Sesame Paste Produced by Ball Milling Compared against Conventional Colloid Milling
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The physicochemical characteristics and general food quality were greatly impacted by milling. In order to investigate the effect of milling technique for physicochemical properties of sesame paste of sesame paste, samples were prepared using ball mill and colloid mill by varying grinding times. The samples prepared by ball milling had the higher moisture contents (0.07% - 0.14%) than colloid milling (p < 0.05), except for colloid milling for one cycle (0.11%). The particle size curves showed the multimodal distributions. Compared to colloid milled samples, ball milled samples have smaller particle sizes and more uniform particle distribution. The L* values of samples prepared by ball milling were higher than colloid milling. The ball mill produced sesame paste with a wider range of hardness and silkier texture, and the samples made by ball milling for 30 min had the highest hardness. And the hardness of both CMS and BMS showed a decreasing trend with increasing grinding time. During ball milling, high-speed cutting and collision caused breakage of disulfide bonds, and the sesame proteins were decomposed to their subunits. In conclusions, ball milling may be an alternative and promising process for the preparation of sesame paste.Keywords:
Breakage
This study is aimed to determine the grindability and kinetic behavior on grinding of vitrified sanitary ware wastes. The specific rates of breakage (Si) and the model parameters were determined through kinetic experiments to understand the grinding mechanisms of vitrified wastes. The breakage behaviors were determined experimentally by using mono-size fraction technique. The mono-sized samples of −2360 + 1700 µm, −1180 + 850 µm, and −425 + 300 µm were ground batchwise for the selected periods to determine the Si. At the end of each grinding period, using the material at different mono-size groups, particle size distributions and breakage behaviors of the products were determined. Depending on the grinding periods in both of the mills, energy consumptions and d80 values of grinding products obtained by varying grinding periods were determined. It was acquired that as the size group decreases breakage speed gets slower in the ball mill and increases in the stirred mill. An increase in the grinding period results in an increase in energy consumption, but there is no significant change in d80 size in grinding of vitrified waste in the ball mill. However, it was found that d80 size significantly decreases depending on the increasing grinding period in the stirred mill.
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A majority of practical mehods of calculating size match of grinding media for ball mills were compared by means of grinding experiments. The results show that, determination of rational grinding media size match should begin with selecting single size media of suitable diameter on basis of feed particles size distribution, and then calculate mass percentage of each size grinding media, which should be in accordance with the fraction of corresponding feed particle size. However, in such case that the fraction of coarse particles in mill feed is low, the grinding time last long, and the slurry viscosity is high, it is necessary to increase the mass fraction of larger media with all size media having the same mass percentage, which can decrease negative effect of high viscosity on grinding and increase grinding efficiency.
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The limit of in-water grinding of silica sand by a planetary ball mill, which gives a much higher grinding rate than tumbling ball mills, was investigated from the viewpoint of mechanical grinding conditions. The grinding limit and subsequent negative grinding were confirmed in the in-water grinding. To do this, the product fineness was evaluated on the basis of size analysis by the laser scattering-diffraction method. As a result of a series of experiments, it was found that the grinding equilibrium size, defined as the minimum particle size determined by the size analysis, decreased as the ball size, ball density or mill's rotation was reduced. The grinding equilibrium size was well correlated with the maximum force exerting on a single ball in the mill pot within the experimental range.
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This paper presents a study on the production by co-grinding of a diluted solid tracer,
sized less than 10 mm and containing less than 2 wt. % of active product, used in the field of
grounds contamination and decontamination. Co-grinding was performed in a tumbling ball
mill and permits to produce easily a diluted tracer without implementing several apparatus.
The two products were ground separately first and then together. The follow-up of the
particles size and morphology, as well as the modelling of the grinding kinetics have
permitted to propose a mechanism by which the diluted solid tracer is produced.
The influence of the operating conditions (nature and initial size of the diluting medium, ball and powder filling rates, proportion of the polluting tracer) on products grinding was studied.
Thus, we have defined optimum co-grinding conditions permitting to produce a tracer offering the required properties. These ones are classical for tumbling ball mills.
This kind of mill is very interesting since its sizes can easily be extrapolated to answer to an
industrial demand.
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Grinding is one of the most basic and important operations of powder processing. Grinding has been carried out all over the world for a long time. However, the grinding mechanism has not been elucidated scientifically. Computer simulation have a possibility to be a useful tool to clarify the grinding mechanism. In this review, new simulation methods for particle breakage were introduced, and the advantage of each method was discussed. Prediction of grinding results based on the impact energy has an advantage of calculation load, however, it is difficult to analyze the grinding process. On the other hand, direct simulation of particle breakage can analyze the grinding process. It is necessary to choose an appropriate method according to the purpose.
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Abstract In the present study, the effect of grinding media shape on breakage parameters was investigated. Balls and cylpebs were used as the grinding media. It was observed that the grinding of quartz obeyed first‐order breakage kinetics in the case of balls and cylpebs. Higher breakage rates were noted with cylpebs than with balls. Furthermore, it was found that the primary breakage distribution function is dependent on the feed size (i.e., non‐normalizable), but independent of the grinding media shape. The effect of grinding time on the product size distribution has also been investigated. Following four and ten minute grindings, cylpebs produced a relatively finer product compared to balls.
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