آخرین محصولات
Hydrothermal synthesis of bentonite carbon composites for ultra-high
In the case of bentonite, high temperatures accelerate dehydration and agglomeration. Its performance begins to deteriorate at temperatures above 120 °C (Vryzas et al., 2016), which in turn results in a significant increase in filtration loss and the deterioration of rheological properties (Kelessidis et al., 2007). ...
Rheological properties of magnesium bentonite and …
Aimed at the problem of poor anti-temperature capability of polymer viscosifier, which cannot meet the needs of ultra-high-temperature water-based drilling fluid, laponite has been studied as an ...
(PDF) Effect of nano bentonite on direct yellow …
Nano-bentonite, adsorption isotherm, regression analysis, direct yellow 50, Climate Chang es Introduction Water is the most important polar solvent all over the world.
Oxidation of magnesium alloys at elevated temperatures in air…
Download: Download high-res image (1MB) Download: Download full-size image Fig. 2. Macroscopic surface morphologies of AZ91 after oxidation in air for the following conditions. (a) After 10 h at 387 °C, the surface was flat and a change of colour from bright metallic to matte grey indicated the formation of a uniform surface layer.(b) After one hour at …
Designation of a new strategy to produce high-strength …
This study focused on the development of an innovative calcium carbonate (CC)-raw bentonite (RB) mortar for high temperature purposes. The main strategy proposed in this work relies on the synergistic thermal and chemical activation of CC/RB-based mortar to produce a hardened material with optimal engineering properties. Instead of calcining RB ...
Water retention of a bentonite for deep geological …
Water adsorption is an exothermic process, whereas desorption is endothermic. Therefore, adsorption becomes less efficient at high temperature, while desorption is facilitated. At high temperature, moreover, the number of water molecules that clay particles are able to adsorb decreases f (Malikova et al., 2004; Zheng and Zaoui, 2013).
Assessment of thermal-hydraulic-mechanical-chemical …
This is the main reason why bentonite has a very high swelling potential, ... The increase in thermal conductivity of pure bentonite with rising temperature is partly due to latent heat transfer (LHT) of vapor, which facilitates heat transport through phase changes in the absorbed water within the bentonite structure. However, for the bentonite ...
Effect of thermal ageing on physical properties of MX80 bentonite …
After the nuclear waste is stored in the disposal repository, it will continue to decay and release a large amount of heat, which results in changes in the temperature field in the repository (Zheng et al., 2015; Kale and Ravi, 2018).Lee et al. (2014) revealed that the initial temperature at the interface between the waste canister and bentonite block buffer layer may …
Green Sands
Their main features in green sands are high strength, high tolerance for differences in water content, high resistance to overheating, as well as a durability at high temperatures. One of the basic features of montmorillonite is its ability to absorb ions from aqueous solutions (the so-called ionic capacity ) and the cation exchange capacity ...
Contractor Report to RWM Bentonite in a High …
bentonite piping and erosion, and the alteration of bentonite at temperatures >100°C. This review relates to Task 468 - Review of bentonite erosion work and identification of future research...
Bentonite in a High-temperature Environment
RWM's generic illustrative disposal concepts for high level waste, spent fuel, highly enriched uranium and plutonium in higher strength rock and lower strength sedimentary rock are currently ...
Experimental study for temperature effect on swelling …
In addition to low permeability, another important characteristic of bentonite is its high self-healing capacity. Reportedly, thousands or even millions of years are needed for HLW to decay fully (Posiva 2012).During this extremely long duration, groundwater is expected to intrude consistently into buffer material (SKB 2011).After bentonite contacts water, its volume will …
An Investigation of the Effects of Additives and Burning Temperature …
It was established that the optimal additions of diatomite and bentonite clay to loam make it possible to obtain after burning at 1170 °C samples of ceramic products corresponding to the 2nd ...
(PDF) High-temperature stability in air of Ti3C2Tx …
Utilized as terahertz shielding materials, the composite retains its shielding ability after high-temperature treatment even up to 600 °C, while pristine Ti3C2Tx is completely oxidized with no ...
Thermoresponsive Bentonite for Water-Based Drilling Fluids
1. Introduction. As an important industrial material, bentonite has been widely applied in agricultural, medical, and energy fields for decolorization, suspension, and stabilization [1,2,3].During drilling for oil or gas, bentonite can effectively reduce the loss of the filtration of the water-based drilling fluid and improve the ability of the water-based drilling fluid to shear and …
Hydrothermal synthesis of bentonite carbon composites for ultra-high
In the case of bentonite, high temperatures accelerate dehydration and agglomeration. Its performance begins to deteriorate at temperatures above 120 °C (Vryzas et al., ... the color of Bent progressively changed from light yellow to brownish-black, further confirming that the Bent particle surface was coated with carbonaceous species ...
[PDF] Rheological properties of magnesium bentonite and …
The rheological properties of three Na-activated, ctahedral Mg-bentonites (hectorite clay from the CMS Source Clay Project repository, saponite clay from Spain and stevensite clay from Rhassoul, Morocco) and a sepiolite clay from Greece were examined after dynamic ageing at temperatures up to 230°C. The 5% w/v suspensions were prepared by …
Contractor Report to RWM Bentonite in a High …
of the alteration behaviour of bentonite at high temperatures in order to gain confidence in its safety function performance within a GDF environment. Recognising these challenges, further research is required to address a number of outstanding tasks identified by RWM's Science and Technology Plan (RWM, 2016), which relate to ...
Blue, orange or yellow: what determines the color …
Why it's Yellow: Moderate heat, often seen with restricted air supply, leading to incomplete burning of fuels. White Flame. Temperature: From 1,300 °C (2,400 °F) to over 1,500 °C (2,700 °F). Why it's White: The hottest …
The samples with bentonite after burning at 1100 • C for 1 h.
Download scientific diagram | The samples with bentonite after burning at 1100 • C for 1 h. from publication: An Investigation of the Effects of Additives and Burning Temperature on the ...
Modeling THMC changes in EBS bentonite at high temperature …
Two scenarios were simulated for comparison: a case in which the temperature in the bentonite near the waste canister can reach about 200°C and a case in which the temperature in the bentonite ...
Temperature dependence of apparent thermal conductivity …
Fig. 16 shows the temperature-time curves on the canister surface with the burn-up value of 40 MWd/kgU and cooling time of 60 years when the thermal conductivity of the GMZ bentonite is equal to 0 ...
Bentonite: Characteristics, uses and implications for
Higher temperature favours the adsorption of Al(III) on bentonite but goes against for kaolin. The adsorption capacities of bentonite and kaolin for Al(III) respectively reach 12.48 and 0.875 mg/g ...
BENTONITE AND FOUNDRIES
• The use of bentonite with better hydration and water retention properties slows evaporation extending the cooling period during mould filling. • The use of bentonite which can hold its …
Evaluation method of thermal stability of bentonite for water …
The results shown that the crystallization characteristics of natural bentonite causes it to form a network lattice structure under high temperature, leading to an increase in …
Hydro-mechanical behavior of heated bentonite buffer for …
Geologic disposal of high-level radioactive waste (HLW) relies on both natural barriers formed by rock formations and an Engineered Barrier Systems (EBS) in isolating the waste from biosphere (IAEA, 2003).In most repository designs, emplacement tunnels will be backfilled with bentonite material as an engineered barrier element that provides mechanical …
The effects of temperature on the characteristics of …
It was found that kaolinite becomes non-plastic at 400°C and bentonite at 500°C. Grain size growth with increasing thermal treatment plays indeed a major role. Thermal treated kaolinite …
(PDF) Thermal analysis of foundry bentonites
This study focuses on the structural changes of bentonite upon thermal treatment at various temperatures, i.e. 150, 300 and 600, and their effect on the sorption behaviour for …
Application of carbon coated bentonite composite as an ultra-high …
The results indicated that CCBC imparted minor influence on the rheological characteristic of bentonite suspensions before and after thermal aging, but decreased the filtration loss of bentonite suspension and water-based drilling fluid remarkably after thermal aging, superior to some conventional commercial high temperature resistant ...
Recommended Protocol for Heat Stability Testing and Bentonite …
Bentonite trials are run concurrently with a non-treated control to determine the dose of bentonite needed to achieve protein stability. Make a 5% stock solution of pre-hydrated bentonite. The bentonite used for the trial should be from the same manufacturer, brand, and batch as the bentonite that will be used in the wine.
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