Abstract
The article discusses the research of peat physical and mechanical treatment which consists in determining technological parameters of peat stock. Size distribution and conditional specific surface area of peat particles are set. The relationship between processing efficiency and the content of peat fractions which size is less than 250 microns is derived. It proves to be linear. Treatment efficiency is found to be estimated by the data of a screen analysis alone and with satisfactory accuracy. Mechanical treatment has an effect on the values of total moisture capacity. The dependence is nonlinear and decreases insignificantly up to the conditional specific surface area of 350 m2/kg due to the partial grinding of fibrous coarse fractions. Mechanical treatment up to the conditional specific surface area of 500 m2/kg results in the sharp decrease of total moisture capacity due to the practically complete destruction of coarse fractions. With that of more than 500 m2/kg the values of total moisture capacity change insignificantly. Multiple peat treatment causes its mechanical consolidation and the reduction of coarse fraction content along with significant increase of fine fraction content.
Highlights
The flowsheet of the production of finished products from peat stock is based on the processes of its significant dewatering at various production stages and during mechanical treatment [1-7]
The value of the conditional specific surface area depends on fractioning the dispersion system and, it is conditional
The presence of a nearly linear bond can be expected between the fraction of
Summary
The flowsheet of the production of finished products from peat stock is based on the processes of its significant dewatering at various production stages and during mechanical treatment [1-7]. Water-saturated peat has water of weak bond, mechanical and osmotic retention. The maximal amount of water relative to dry weight which can be retained owing to different forces (molecular, osmotic) defines its total moisture capacity. The capacity to take up water is determined by the content of fibrous coarse particles having large cavities which absorb and retain large amounts of water. Dispersed peat systems are characterized by the substance fineness factor expressed as a percentage and conditional specific surface area of particles. The latter should be defined to characterize peat as the raw stock for industry and to study different production processes
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