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Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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Precipitation Processes

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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
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Solid-State Recrystallization Pathways of Sodium Aluminate Hydroxy Hydrates.

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Solid-state recrystallization transforms tetrahedral aluminum in monosodium aluminate hydrate (MSA) to octahedral aluminum in nonasodium aluminate hydrate (NSA). Intermediate aluminum coordination states were not detected, suggesting they are transient.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Solid-State Chemistry

Background:

  • Crystallization of aluminum (Al3+) solids from alkaline solutions typically requires a change from tetrahedral to octahedral coordination.
  • Intermediate coordination states of Al3+ are challenging to isolate and study.

Purpose of the Study:

  • To investigate the Al3+ coordination change during the solid-state recrystallization of monosodium aluminate hydrate (MSA) to nonasodium bis(hexahydroxyaluminate) trihydroxide hexahydrate (NSA).
  • To understand the mechanistic details of Al3+ coordination changes in highly alkaline systems.

Main Methods:

  • Solid-state reaction of MSA and sodium hydroxide hydrate.
  • X-ray diffraction (XRD) and Raman spectroscopy for structural analysis.
  • In situ single-pulse 27Al magic angle spinning (MAS) NMR and 27Al multiple quantum (MQ) MAS NMR spectroscopy for Al3+ coordination state determination.

Main Results:

  • Spontaneous recrystallization of MSA into NSA occurred over 3 days at ambient temperature, confirmed by XRD and Raman spectra.
  • NMR spectroscopy revealed a complete transformation from tetrahedral Al3+ in MSA to octahedral Al3+ in NSA.
  • No evidence of intermediate aluminate species, such as pentacoordinate Al3+, was found.

Conclusions:

  • The Al3+ coordination change from tetrahedral to octahedral during MSA to NSA recrystallization is rapid and does not appear to involve long-lived intermediate states.
  • Short-lived transitional states likely exist but require higher time-resolution spectroscopy for detection.
  • Understanding these mechanisms is crucial for applications in aluminum refining, corrosion science, and nuclear waste processing.