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Related Concept Videos

Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

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Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
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Hydration of Cement01:24

Hydration of Cement

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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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Volatilization01:10

Volatilization

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Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
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Microbial Leaching01:27

Microbial Leaching

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Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
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Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

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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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Factors Affecting Solubility04:01

Factors Affecting Solubility

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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:
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Related Experiment Video

Updated: Mar 20, 2026

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Calcification-carbonation method for red mud processing.

Ruibing Li1, Tingan Zhang2, Yan Liu2

  • 1School of Metallurgy, Northeastern University, Shenyang 110819, China; Laboratory for Simulation and Modelling of Particulate Systems, Department of Chemical Engineering, Monash University, Clayton, Victoria, 3800, Australia.

Journal of Hazardous Materials
|May 24, 2016
PubMed
Summary

A new calcification-carbonation method fully utilizes Bayer process red mud, recovering alumina and soda while producing usable cement materials. This process addresses environmental concerns associated with red mud disposal.

Keywords:
CalcificationCarbonationHydrogarnetRed mud

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Area of Science:

  • Chemical Engineering
  • Environmental Science
  • Materials Science

Background:

  • Red mud, a residue from the Bayer process in alumina production, poses significant environmental challenges.
  • The disposal of large volumes of red mud requires sustainable and economically viable solutions.

Purpose of the Study:

  • To propose and validate a novel calcification-carbonation method for the comprehensive utilization of Bayer process red mud.
  • To recover valuable components like alumina and soda from red mud.
  • To transform the residue into a usable material for cement production.

Main Methods:

  • Calcification of red mud with lime to form hydrogarnet and recover alkali.
  • Decomposition of hydrogarnet via CO2 carbonation to yield calcium silicate, calcium carbonate, and aluminum hydroxide.
  • Low-temperature alkaline extraction of alumina.

Main Results:

  • Achieved 49.4% alumina extraction efficiency and 96.8% soda recovery.
  • Produced a treated red mud with less than 0.3% alkali content, suitable for cement production.
  • Demonstrated the feasibility of complete red mud utilization through combined processing and cement production.

Conclusions:

  • The proposed calcification-carbonation method offers an effective route for the valorization of Bayer process red mud.
  • This approach mitigates environmental issues by transforming waste into valuable resources.
  • Integrated red mud treatment and cement production presents a pathway towards a circular economy in the alumina industry.