Related Experiment Video
Updated: Dec 31, 2025
11:14
Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
12.8K
Preparation of a Carbonate-Free Complex Calcium Aluminate
Summary
Preparing carbon dioxide-free calcium aluminate monosulfate is challenging. This study details a closed-system method using CO2-free air to successfully synthesize this compound in large quantities.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Chemical Engineering
Background:
- Portland cement compounds are difficult to synthesize free of carbon dioxide.
- Calcium aluminate monosulfate presents additional challenges due to its instability during precipitation.
Purpose of the Study:
- To develop a method for preparing carbon dioxide-free calcium aluminate monosulfate in large quantities.
- To overcome the instability and time constraints associated with its synthesis.
Main Methods:
- Utilized a closed-system precipitation and filtration assembly.
- Employed trapped pockets of CO2-free air for rapid solution and liquor movement.
- Conditioned and packaged the precipitate within a CO2-free glove box.
Main Results:
- Successfully prepared calcium aluminate monosulfate in large quantities.
- Achieved a product completely free of carbon dioxide.
- Demonstrated a reliable method overcoming precipitation instability.
Conclusions:
- The described closed-system technique effectively produces carbon dioxide-free calcium aluminate monosulfate.
- This method addresses the critical need for pure, stable calcium aluminate monosulfate synthesis.
- Detailed techniques are provided for replication and further research.
Related Concept Videos
01:24Hydration of Cement
698
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...
698
01:26Alkali Aggregate Reaction in Concrete
430
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
430
01:29Sulfate Attack on Concrete
623
Sulfate attack on concrete is a deterioration process characterized by a whitish discoloration beginning at the edges and corners, accompanied by cracking and spalling. This phenomenon occurs when sulfates react with the components of hardened concrete, forming compounds like calcium sulfate and calcium sulfoaluminate which occupy more space than the substances they replace, causing the concrete to expand and disrupt.
Sulfates from sources like soil, groundwater, or industrial effluents...
Sulfates from sources like soil, groundwater, or industrial effluents...
623
04:01Factors Affecting Solubility
36.4K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
36.4K
01:07Preparation of Acid Anhydrides
3.8K
One of the methods for preparing symmetrical or unsymmetrical acid anhydrides involves the treatment of acid chlorides with the sodium salt of carboxylic acids. The reaction proceeds via a nucleophilic acyl substitution.
The carboxylate ion acts as a nucleophile that attacks the carbonyl carbon of the acid chloride to form a tetrahedral intermediate. Subsequently, the re-formation of the carbonyl group with the loss of the chloride ion as a leaving group leads to the formation of an acid...
The carboxylate ion acts as a nucleophile that attacks the carbonyl carbon of the acid chloride to form a tetrahedral intermediate. Subsequently, the re-formation of the carbonyl group with the loss of the chloride ion as a leaving group leads to the formation of an acid...
3.8K
03:46Qualitative Analysis
23.5K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
23.5K