Huber Health & Nutrition is a trusted nutritional ingredient supplier offering its exclusive HuberCal ® line of natural and pure calcium carbonate products. As the only North American calcium carbonate supplier to produce both calcium carbonate powders and granulations, we have unparalleled control over the quality and reliability of our ...

The most commonly used microorganisms in MICP are urease and carbonic anhydrase producing bacteria which both generate carbonate under the proper condition. With the presence of calcium ion, calcium carbonate (CaCO 3) is deposited in the form of calcite within sand particles and binds them together.

The influence of monoethylene glycol (MEG) on the precipitation process of calcium carbonate at constant supersaturation, 25 °C, and pH 8.5 was investigated. MEG aqueous solutions supersaturated with respect to all calcium carbonate polymorphs were used since they are often encountered in oil production processes where they are used …

Precipitated calcium carbonate (PCC), a filler and pigment material, is typically produced by calcining limestone at high temperature processes and by re-carbonating the formed calcium oxide in an aqueous solution. This process causes significant carbon dioxide emissions, while it enables particle size and quality control …

The precipitation of calcium carbonate was carried out by passing a gaseous mixture of carbon dioxide and air into a calcium chloride solution. The selected compounds enhancing carbon dioxide absorption were used as additives which promote the formation of carbonate ions in the solution.

A novel process for precipitated calcium carbonate production and carbon dioxide mineralization is studied. The process consists of two steps; firstly calcium is selectively extracted from steelmaking slags with an ammonium salt solution, secondly the dissolved calcium is allowed to react with carbon dioxide and is thus precipitated as …

Precipitated calcium carbonate (PCC) is used as filler and coating materials in paper. If slag could be used instead of limestone for producing PCC, considerable energy savings and carbon dioxide emissions reductions could be achieved. In this paper, the leaching of calcium from iron and steel slags using acetic acid was investigated.

The urease reacts with the cementation solution with different concentrations of urea and calcium ions at different temperatures to determine the calcium carbonate production rates (RCC). The crystal sizes of calcium carbonate (SCC) are investigated by scanning electron microscopy (SEM) and image processing method.

Calcite and vaterite were the dominant carbonate polymorphs, with varying proportions. Concrete aggregates have proven to be a source of microorganisms capable of producing stable calcium ...

Semantic Scholar extracted view of "Chemical kinetics modeling and process parameter sensitivity for precipitated calcium carbonate production from steelmaking slags" by Hannu-Petteri Mattila et al.

The urease reacts with the cementation solution with different concentrations of urea and calcium ions at different temperatures to determine the calcium carbonate production rates (RCC).

The solution was changed up to the total dissolution of calcium carbonate in the samples, leaving only the non-calcareous inorganic mass. After removing all the liquid from the flasks, we washed the remaining material with Milli-Q water and dried it at 60 °C until weight stabilization, thus the non-calcareous inorganic mass was recorded.

These membranes also performed well when treating a highly concentrated solution containing calcium carbonate, iron sulfate, sodium chloride, and sodium arsenate dibasic heptahydrate.

In this study, we investigated the production of precipitated calcium carbonate (PCC) particles from desulfurization gypsum (DG) waste using a new experimental apparatus that is divided into two main …

AbstractThe precipitation of calcium carbonate from supersaturated solutions seeded and unseeded was studied at constant supersaturation, 25°C, pH 8.5. The experiments were done in aqueous solutions and in solutions containing water miscible and immiscible organic solvents in order to simulate conditions of scale …

The studies revealed that the precipitated calcium carbonate can be produced from marble wastes. By the experimental studies, the required conditions for production have been determined.

The research in the manuscript provided a new idea for the high-value utilization of carbide slag and the production of calcium carbonate with microstructure and nanostructure with high purity.

For instance, fine precipitated calcium carbonate, a valuable product with unit price in the range of $230-280/t and a global market projected to reach 99 M tons in 2020, can be produced by capturing CO 2 within aqueous Ca 2+ solution.

In this work, the precipitation of high-quality calcium carbonate (PCC) from synthetic Ca-rich solutions was investigated. A mixture of Ca and Mg salt…

Bunger et al. (1998) was able to recover slaked lime from carbide sludge into solution with subsequent reacting of the solution with carbon dioxide to form calcium carbonate.

In plastics, Imerys engineered calcium carbonates improve the quality of breathable films for diapers, hygiene, medical and roofing applications. They are excellent reinforcement agents maximizing mechanical properties in PVC building profiles and flooring. In paper production, Imerys calcium carbonates are cost-effective filler substitutes for ...

We are currently studying the possibility to produce calcium carbonates by leaching calcium from calcium silicates using acetic acid, and precipitating calcium carbonate out of the solution by injection of CO 2. In this paper, we have focused on the extraction of calcium from iron and steel slag in aqueous solutions of acetic acid.

Ureolytic bacteria help in the neutralization of treated wastewater through a bacterially-induced calcium carbonate (CaCO 3) precipitation process. The precipitation takes place through various pathways of the nitrogen cycle, including the ammonification of amino acids, the denitrification of nitrate and organic carbon, and the ureolysis ...

calcium carbonate (CaCO3), chemical compound consisting of one atom of calcium, one of carbon, and three of oxygen that is the major constituent of limestone, marble, chalk, eggshells, bivalve shells, and corals. Calcium carbonate is either a white powder or a colorless crystal. When heated, it produces carbon dioxide and calcium …

The proposed research was divided into two stages, during the first stage a pure calcium chloride solution was carbonated, and the effect of different parameters (CO 2 flow rate, ammonia amount ...

Develop and evaluate the proposed methods for production of precipitated calcium carbonate (PCC) while simultaneously utilizing CO2 and industrial solid and liquid wastes.

The proposed research was divided into two stages, during the first stage a pure calcium chloride solution was carbonated, and the effect of different parameters (CO2 flow rate, ammonia amount, presence of additives, …

This relies on an electrochemical process whereby the dissolution of carbon dioxide into carbonate ions is accelerated by a locally induced pH change at the cathode. The carbonate ions can then complex with metal cations, such as Ca 2+, Sr 2+, or Mn 2+, present in solution to form their respective metal carbonates, which precipitate out of ...

Shallow, seaward portions of modern coral reefs produce about 4 kilograms of calcium carbonate per square meter per year, and protected areas produce about 0.8 kilogram per square meter per year. The difference is probably largely a function of water motion. The more rapid rate, equivalent to a maximum vertical accretion of 3 to 5 millimeters ...

Development work on the production of pure calcium carbonate from steelmaking slags by carbonation is presented in this study. Selective extraction of calcium from steelmaking slags was investigated using various solvents. Precipitation of CaCO3 from dissolved calcium at atmospheric pressure was also investigated.