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RHEOLOGICAL PROPERTIES OF CALCIUM-PHOSPHATE AND MONOBASIC CALCIUM PHOSPHATE SLURRIES BEING BYPRODUCTS OF DOUBLE SUPERPHOSPHATE

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Ўзбекистон кимё журнали

Ўзбекистон кимё журнали

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Background. Cyclic technology of processing natural phosphate in double superphosphate provides overall decomposition of secondary raw for a short time. This way for double superphosphate pro- duction is more efficient than conventional one, such as chamber, chamber-line, line and multiple-return. There has been conducted the study of rheological properties (in a range 30-100°С) of calcium-phosphate and monobasic calcium phosphate (MCP), being the by-products of phosphorite concentrate decomposition under high norms and concentrations of wet process phosphoric acid (WPA). It has been shown that rheolog- ical behaviors of the slurries in studied range are sufficient during the pumping in existing devices. Purpose. The object of the research is to study density and viscosity of calcium-phosphate and acidic MCP slurries in a wide range of temperature: 30-100°С. Methodology. Liquid’s density was defined picnometrically, their viscosity – with capillary viscome- ter in measuring volumetric speed of slurry flow through VPJ-2 device supplied with capillary diameter 1.47 and 2.37 mm put in thermostat filled with glycerin. Originality. For the first time there have been studied the rheological properties of by-products of phosphorite concentrate decomposition under high norms and concentrations of WPA from phosphorite of Central Kyzylkum. Findings. There have been found the value of the rheological properties (density and viscosity) of calcium phosphate and MCP slurries at 30-100°С. The chemical composition and crystallization temperature of two types of the slurries have been determined. It has been established that calcium phosphate and MCP slurries in the studied ranges of concentration and norms of WPA starting from 60 and 70С respectively, are fluid. Highlights: -it has been shown the manufacturability of MCP slurry in the wide temperature ranges; -the dependence of rheological properties value on the temperature has been established.

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# density# кристаллизация# viscosity.# мытый  обожженный  концентрат# ЭФК# кальцийфосфатная  и  монокаль- ц# плотность и вязкость.# Ювиб  куйдирилган  концентрат# кальцийфосфат  ва  монокальцийфо# зичлик ва қовушқоқлик.# Washed and calcinated concentrat# WPA# calcium-phosphate and monobasic

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https://eroi.uz/11.0030/A0220-0057

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