Microbially-Induced-Calcite-Precipitation (MICP): A …
Microbial calcite-precipitation is used as a smart and eco-friendly approach to produce bio-based durable concrete. SEM, EDAX & DTA verified that the addition of B. …
Remineralization and Stabilization of Desalinated …
Permeate or distillate from desalination processes is typically void of minerals and alkalinity, inherently acidic and therefore corrosive to water distribution infrastructure. The reintroduction of both minerals and alkalinity is …
Calcite in froth flotation
The iso-electric point (iep) for pure calcite is varied from 8.5-to 11.5 (Table 1) [[31], [32], [33]].This variation depends on experimental conditions such as sample preparation methods, conditioning time, zeta-potential measuring techniques, and mineralogy [34].Filippov et al. (2012) indicated that the vapor–liquid equilibrium of CO 2 must be considered an effective …
Modification of calcite by hydration–dehydration method …
The crystallinity of all the samples was probed by powder XRD. The diffraction pattern for commercially available CaO (CaO C) was also presented for comparison purposes. Fig. 1 A shows the XRD patterns for fresh calcite, CaO S, and CaO W.The parent material showed major diffraction peaks at 29.4°, 36.2°, and 47.5°, which is characteristic of CaCO 3 …
Coupled bio-chemo-hydro-mechanical modeling of …
The experimental calcite content was observed to have a peak near the top boundary of the sample. Nevertheless, the trends of calcium carbonate for all crystal sizes were similar. Though, the calcite concentrations of the model couldn't follow the reverse curve type distribution of experimental calcium carbonate concentration.
Optimization of Injection Methods in the …
Microbially induced calcite precipitation (MICP) is a promising, more eco-friendly alternative method for landslide prevention and foundation reinforcement. In this study, we investigated the optimization of injection …
Precipitation Methods Using Calcium-Containing Ores for …
The diffraction peak of CaF 2 was detected in the calcite precipitation product, indicating that CaF 2 was produced in the calcite precipitation reaction process. The reaction time poses small influence on fluoride removal by calcite precipitation method. Therefore, the reaction time was selected at 30 min.
Application of Microbially Induced Calcite Precipitation …
To control the MICP process in field applications, factors such as chemical reactant concentrations and methods of introducing bacteria and chemicals to the reaction medium must be considered. Calcium carbonate is created in an amorphous shape and different crystal polymorphs such as calcite, vaterite, and aragonite, depending on the ...
(PDF) Methods for Calcium Carbonate Content Measurement …
In this method, the properties of biocemented soil are controlled by the calcium carbonate content produced through the MICP process. Various methods have been used in the literature to determine ...
An Overview of Calcite Recovery by Flotation
Calcite occurs in nature either as high-grade (with >75% calcite) or low-grade calcite ores (with <30% calcite). Generally other carbonate, phosphate, silicate, and iron sul-phide minerals are associated with the calcite ores. Gravity and/or magnetic separation and flotation are the beneficiation techniques most commonly applied to calcite ores ...
Factors Affecting the Crystal Growth of Scalenohedral Calcite …
Methods: The calcite powder was prepared from Ca(OH)2 analytical grade powder utilizing the fine-bubble carbonation process with the Ca(OH)2 concentration and initial pH variation.
Calcium carbonate crystallization process from the …
The distillation waste stream from the ammonia-alkali process contains 90–120 g/L of calcium chloride. Using calcium chloride as raw material to mineralize carbon dioxide can achieve efficient utilization of calcium chloride waste and CO 2 emission reduction. This article is based on a two-step synthesis method, using ammonium carbonate and calcium chloride as …
Process optimization of Microbially Induced Calcite …
Process optimization of Microbially Induced Calcite Precipitation by Ureolytic Yeast Spathospora sp. NN04 using Box- Behnken Design: A Novel Approach towards Biocementation. September 2021 DOI: 10 ...
Calcite seed-assisted microbial induced carbonate …
Microbial-induced calcium carbonate precipitation (MICP) is a biological process inducing biomineralization of CaCO 3. This can be used to form a solid, concrete-like material. …
Calcite in froth flotation
Through the flotation process, calcium particles release cations into the pulp solution, generate similar surface properties throughout ore minerals, consume reagents, and lockdown …
Cementation of sand soil by microbially induced calcite …
A newly emerging microbiological soil stabilization method, known as microbially induced calcite precipitation (MICP), has been tested for geotechnical engineering applications. MICP is a promising technique that utilizes the metabolic pathways of bacteria to form calcite precipitation throughout the soil matrix, leading to an increase in soil strength and stiffness. …
A new multi-analytical procedure for radiocarbon dating of …
This process can develop in specific areas of the samples, e.g. in pores and along fractures (referred to as secondary calcite) or change the entire texture of the binder (referred to as partially ...
A mini review of enzyme-induced calcite precipitation (EICP) …
This paper has presented a mini review of previously published articles dealing with bio-cement production using enzyme-induced calcite precipitation (EICP) technique. EICP is a biological, sustainable, and natural way of producing calcite without the direct involvement of microorganisms from urea and calcium chloride using urease enzyme in water-based solution …
Evaluation of Various Synthesis Methods for Calcite …
slurries. Recently, this process has been more interesting for industrial purposes to produce large quantities of calcite. The optimum conditions of the calcite synthesis in various sizes from ...
Process optimization for the rapid conversion of calcite into
The current synthesis method using calcite and diammonium phosphate uses less energy by avoiding the hydration and calcination steps and is therefore advantageous to the existing industrial ...
An Overview of Calcite Recovery by Flotation | Materials
Calcite ores typically contain metal sulphide, silicate, or other calcium-containing impurity minerals, which can be removed by flotation. A tremendous amount of research has been performed on refining the flotation process for calcite ores and designing the reagents (specifically, collectors) to increase the efficiency of the process.
(PDF) Field-scale optimization of injection strategies for …
An optimization procedure for sealing leakage paths in field-scale application of microbially induced calcite precipitation (MICP) is develop and applied to CO2 storage.
Precipitated Calcium carbonate production, synthesis and properties
Erdogan N, et al. [26] claim that the Kraft pulping method, also known as the lime soda process (Equation 1), the carbonation process ... sharper crystal peaks, and predominantly calcite PCC. The ...
Process optimization for the rapid conversion of calcite into
The current work focuses on the reaction parameter optimization for a single-step process for the direct and complete transformation of calcite to HAp. Different process …
(PDF) Enzymatic-induced calcite precipitation (EICP) method …
As a bio-inspired calcite precipitation method, bio-grouting via enzymatic-induced calcite precipitation (EICP) uses free urease enzyme to catalyze the urea hydrolysis reaction. This soil stabilization approach is relatively new and insufficiently ... the effect of these materials on the treatment process, and the engineering properties of the ...
A new bioslurry-induced restoration method via …
Due to the high stability and good compatibility of microbially deposition of inorganic calcite, Le Metayer-Levrel, G. et al. (Le Metayer-Levrel et al., 1999) first proposed to do the surface protection of the southeastern tower of Saint-Médard Church using the MICP process in 1990s.The results implied that the biogenic calcium carbonate deposits provided a surface …
Application of Microbially Induced Calcite Precipitation …
Microbially Induced Calcite Precipitation (MICP) through ureolytic bacteria has been considered as the most straightforward and energy-efficient process for engineering …
Calcite precipitation: The forgotten piece of lakes' carbon cycle
We mechanistically demonstrate how the so-far neglected process of calcite precipitation boosts net CO 2 emissions at the annual scale. Far from being anecdotal, ... MATERIALS AND METHODS. Lake Geneva is the largest hardwater lake in Western Europe, with a surface area of 580 km 2. Lake Geneva has a mean water residence time of 11 years, …
Calcite
Calcite replacement is an important mark of the frequent movement of local fluids. During the process of replacement, former pores enlarge or form new pores due to the disappearance of replaced minerals. Some pores are filled with newly precipitated ferrocalcite, while it is soluble. As a result, replacement often improves the porosity.
Calcium carbonate nano- and microparticles: synthesis methods …
Calcium carbonate micro- and nanoparticles are considered as chemically inert materials. Therefore, they are widely considered in the field of biosensing, drug delivery, and as filler material in plastic, paper, paint, sealant, and adhesive industries. The unusual properties of calcium carbonate-based nanomaterials, such as biocompatibility, high surface-to-volume …