PurposeThe main aim of this work was to determine the efficiency and mechanism of iron (Fe)-modified calcite (FMCA) capping for preventing the release of phosphorus (P) from sediments.Methods The ...
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Economic and efficient application of enzyme induced calcium carbonate precipitation (EICP) requires optimisation of the process and understanding of the precipitate microstructure. The objective of this study was to compare the precipitate efficiency and the interface shearing resistance of the precipitate, using Taguchi method. The factors which …
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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...
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Flotation is the most efficient method to recover this type of fluorite. Fluorite and calcite contain Ca 2+. During flotation, the physical and chemical properties of the two …
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Fluorite and calcite were separated with nitrilotriacetic acid (NTA) as a depressant. The single mineral flotation experiment confirmed that with 40 mg/L NaOL and 80 mg/L NTA, the fluorite recovery and calcite recovery were 24.37 and 94.13%, respectively, at pH 9. Meanwhile, in the fluorite-calcite binary mixed ore flotation experiment, the calcite recovery and fluorite …
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In this work, N-tetradecyl-isopropanolamine (NTIA) is synthesized and used as a new collector on the flotation separation process of scheelite from calcite to further improve the efficiency of the ...
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This research not only presents a novel method to improve the flotation separation efficiency and quality of scheelite, thereby reducing reagent consumption and costs but also …
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It can be seen from Table 6 that the absolute values of adsorption energy of calcite adsorbing tannin and sodium humate at the same time are higher than those of calcite adsorbing tannin alone and ...
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In this work, N-tetradecyl-isopropanolamine (NTIA) is synthesized and used as a new collector on the flotation separation process of scheelite from calcite to further improve the efficiency of the selective flotation. The effects of NTIA on minerals are investigated through microflotation experiments.
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At SI CaCO 3 > 0, the SSA of calcite mainly determines barrier efficiency, whereas at SI CaCO 3 < 0, the physico-chemical properties of calcite are less important as already discussed. A higher SSA and microporosity, however, accelerate the dissolution process and, consequently, improve the precipitation of Ca–P compounds.
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Enzyme-induced calcium carbonate precipitation is simple and straight forward, eco-friendly, free from a nutrient supply, and non-disturbing way of stabilizing soils. The …
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Microbially induced calcite precipitation (MICP) is a sustainable and environmentally friendly technology with applications in soil stabilization, concrete crack repair, and wastewater treatment. This study presents an improved Darcy-scale numerical model to simulate the MICP processes in heterogeneous porous media. It focuses on the effects of …
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During the flotation process, the surface of fluorite and calcite is prone to partial dissolution, which makes the surface ions convert to each other. Moreover, the pH value of the slurry has a greater impact on the conversion of the two minerals. ... Much attention has been paid to the efficient separation of fluorite and calcite. Compared ...
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Flotation is widely employed as a technique for separating scheelite from calcite [4], [5]. Sodium oleate is frequently utilized as a collector in scheelite flotation [6], [7], yet its selectivity is limited [8], [9]. Consequently, the selection of suitable depressants during the flotation process is essential for enhancing separation efficiency.
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This paper presents an efficient method of microbial-induced calcite precipitation (MICP) for cementation of sand particles. First, the influence of initial pH value of the culture medium on the growth of bacteria was discussed. ... Suitable grouting speed, concentration of cementation solution and grouting process are beneficial to improve the ...
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As a new green and environmental material, bio-activated cementitious material is attracting extensive attention. This study confirmed that the bio-activated cementitious material could mineralize and cement fugitive dust into the calcite- consolidation-layer based on CO2 capture and utilization. The results illustrated that treatment processes (non-pressure …
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Furthermore, the use of GA increases the efficiency of the dry separation process of the material . Alkanolamine-based GA can also promote the hydration of clinker aluminate phases (C 3 A and ferrite) in LC 3 -type systems, leading to an enhanced precipitation of carboaluminates [ 124 ].
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The process of microbially induced calcite precipitation (MICP) has recently attracted attention due to its efficiency in the immobilization of heavy metals. Ureolytic bacteria govern the MICP process by hydrolyzing urea into ammonium and carbonate ions as the pH increases due to production of ammonium ions.
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Fluorite and calcite were separated with nitrilotriacetic acid (NTA) as a depressant. The single mineral flotation experiment confirmed that with 40 mg/L NaOL and 80 mg/L NTA, …
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Study with Quizlet and memorize flashcards containing terms like Which of the following is/are most susceptible to chemical weathering by dissolution? A) quartz B) clay minerals C) iron oxides D) calcite, What two factors speed up rates of chemical reaction and weathering in rocks and soils? A) low temperatures; very dry B) low temperatures; very moist C) high temperatures; …
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Microbially induced calcite precipitation (MICP) technique utilizes ureolytic bacteria to decompose urea and generate carbonate ions for metal combination. MICP can remediate heavy metal (e.g., Cd) contaminated soils while maintaining or even improving soil functions, but its efficiency in agricultural soil practical application still needs to be enhanced. Here, we …
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Economic and efficient application of enzyme induced calcium carbonate precipitation (EICP) requires optimisation of the process and understanding of the precipitate microstructure.
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Calcite, the most stable polymorph of CaCO 3, is the most important and also the most abundant carbonate mineral on Earth 1,2,3.The precipitation of calcite serves as a sink of metals 4,5,6,7 ...
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An efficient method of microbial-induced calcite precipitation (MICP) for cementation of sand particles and the influence of initial pH value of the culture medium on the growth of bacteria was discussed and results showed that the urease-producing bacteria S. pasteurii can be cultured at the initial pH values of 7–10, while a higher pH would hinder its …
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The anionic oleate and cationic amine collector adsorption theories proposed by various researchers are briefly summarized in this section. The adsorption …
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Apache Calcite is a dynamic data management framework that provides a standard SQL parser, validator, and JDBC driver. ... which is the process of finding the most efficient way to execute a query.
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As a result, the calcite bed system under the acidified feed at pH 4 and the empty bed contact time (EBCT) at 12.7 min exhibited the most efficient calcite dissolution with …
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One of the most energy-intensive processes for producing submicron range calcite is stirred media mill. In the present work, numerous operating parameters such as solid mass fraction, grinding media size, media filling ratio, and grinding time have been investigated using a vertical type stirred media mill. The results are evaluated on the basis of mean particle …
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Benefits of Using Calcite in Water Treatment. To understand the benefits of using calcite in water treatment, delve into its cost-effectiveness, longevity, and sustainable options.. Cost-Effectiveness. Calcite's cost-effectiveness in water treatment processes makes it a great alternative to harsh chemicals. It also helps balance pH levels, reducing the need for …
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Calcite: A Key Ingredient in Efficient Cement Manufacturing. The primary use of calcite lies in construction materials, particularly as a raw material for manufacturing cement …
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