Influence of Rehydration and Activation on Cation Exchange Capacity and Swelling Index of Foundry Sodium Bentonite from Different Deposits.

MRS Advances ◽  
2020 ◽  
Vol 5 (26) ◽  
pp. 1397-1404
Author(s):  
Farai Chrispen Banganayi ◽  
Didier Kasongo Nyembwe
Keyword(s):  
Cation Exchange ◽  
Sodium Carbonate ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Sodium Bentonite ◽  
Commercial Grade ◽  
Iron Castings ◽  
Calcium Bentonite ◽  
Made In

ABSTRACTBentonite is the most widely used foundry binder. Most of the iron castings are made in greensand systems which make use of bentonite as a binder. The bentonite used in greensand moulding is usually activated with sodium carbonate to achieve desirable properties. Activation of bentonite is known to improve mould related properties like giving a high wet tensile strength and improving the durability. The practice of activation is more common with calcium bentonite. A number of bentonite deposits tend to remain unbeneficiated due to their low cation exchange capacity (CEC) which are regarded as low quality commercial grade. The primary characteristic that shows the increased activation is the swelling index of the bentonite. This study investigated the influence of rehydration and activation in improving the quality of low commercial grade sodium bentonite. The bentonite samples were activated with sodium carbonate. Rehydration and activation was seen to improve the CEC and swelling index. The increase in CEC and swelling index was however not consistent with the gains in sodium.

scholarly journals Soil Quality of a Rice Organic Farm in Langkong, M'lang, Cotabato

2019 ◽  
Vol 24 (1) ◽  
pp. 35-53
Author(s):  
Kathleen Cedeño
Keyword(s):  
Organic Matter ◽  
Soil Fertility ◽  
Cation Exchange ◽  
Soil Quality ◽  
Cation Exchange Capacity ◽  
Management Practices ◽  
Exchange Capacity ◽  
Water Holding Capacity ◽  
Water Holding

Soil quality is crucial to global food production security. However, research data on soil quality, which is vital to enhancing soil fertility and crop yield, is limited particularly on the soil in the rice fields located in Langkong, Mlang, Cotabato. This study aims to assess the soil quality of one of the organic rice farms in said area. Soil samples were collected in thirty-one (31) paddies for two sampling periods: thirty (30) days after harvest and thirty (30) days after rice transplanting. Eight (8) soil indicators representing soil physicochemical characteristics were measured from 0-15 cm depth; the indicators were soil texture, water holding capacity, pH, exchangeable phosphorus, extractable potassium, total organic matter, electrical conductivity, and cation exchange capacity. Results reveal that soils in the studied area are characterized by clay loam with moderate water-holding capacity of about 62.57% and 60.57% for both sampling periods, respectively. The soil is strongly acidic (5.3 and 5.5) and has a low amount of organic matter (2.16% and 1.57%) and exchangeable P (8.55 ppm and 2.48 ppm), although it has marginal extractable K (80.77 ppm and 91.10 ppm). Also, the soils are non-saline and have low cation exchange capacity. The findings signify that the soils have insufficient fertility to sustain the optimal growth of the rice plants which can potentially reduce the yield of rice production. Thus, amendment of the soil quality and enhancement of soil management practices should be taken into consideration to further improve soil fertility to ensure productivity and profitability of farmers.

scholarly journals PREPARATION OF SOME VIETNAMESE MONTMORILLONITES

2010 ◽  
Vol 13 (1) ◽  
pp. 17-21
Author(s):  
Mai Thi Hoang Vo ◽  
Thach Ngoc Le
Keyword(s):  
Chemical Composition ◽  
Physicochemical Properties ◽  
Cation Exchange ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Crystalline Structure ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Solid Catalyst

Montmorillonite is a "green" solid catalyst and support used in many organic reations. In this paper, we describe the method to prepare two acid-activated montmorillonites from Binh Thuan and Lam Dong clays. We still prepared some cation exchanged montmorillonites as Fe3+ Zn 2+ and Al 3+. The Vietnamese montmorillonites and K-10, KSF (two commercial Fluka montmorillonites) were determinated simultanneously on some physicochemical properties such as crystalline structure, chemical composition, cation exchange capacity, adsorption capacity, porisity, surface area and acidity. The results shows that the quality of Vietnamese montmorillonites are equivalent with K-10 and KSF.

scholarly journals Influence of the additivation process on cation exchange capacity and viscosity of bentonitic clay dispersions

Cerâmica ◽  
2020 ◽  
Vol 66 (377) ◽  
pp. 81-87 ◽  
Author(s):  
I. C. G. Morais ◽  
I. A. Silva ◽  
B. M. A. B. Buriti ◽  
J. V. Fernandes ◽  
D. S. Silva ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Sodium Carbonate ◽  
Cation Exchange Capacity ◽  
Solution Process ◽  
Bentonite Clay ◽  
Exchange Capacity ◽  
Drilling Fluids ◽  
Exchange Reactions ◽  
Cure Time ◽  
Bentonite Clays

Abstract In Brazil, bentonite clays are not naturally sodic and it is an industrial practice the sodium additivation, since sodium ion expands their lamellae allowing a larger amount of water to penetrate. The objective was to analyze the influences of the use of sodium carbonate on the clay during the additivation process, the moisture content and the cure time on cation exchange and viscosity of bentonite clay dispersions for water-based drilling fluids, since there is a shortage of studies on this subject. Newly discovered bentonite clays in Paraíba State, Brazil, were chemically, physically and mineralogically characterized and were additivated with sodium carbonate in aqueous solution (process 1) or in powder form (process 2). Samples with 25% to 60% of moisture (dry basis) were prepared and submitted to cure times of 7 to 45 days. Process 1, as expected, showed better results of cation exchange capacity, viscosity and filtrate volume. The ideal cure time was 15 days. After this period there was a reversal of the cation exchange reactions.

scholarly journals Quality of zeolit from Vranjska banja deposit according to size classes

2013 ◽  
Vol 67 (4) ◽  
pp. 663-669 ◽  
Author(s):  
Zivko Sekulic ◽  
Aleksandra Dakovic ◽  
Milan Kragovic ◽  
Marija Markovic ◽  
Branislav Ivosevic ◽  
...  
Keyword(s):  
Particle Size ◽  
Cation Exchange ◽  
Natural Zeolite ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Size Classes ◽  
Particle Size Classes ◽  
Wet Sieving ◽  
Xrpd Analysis

This paper presents results of investigations of the quality of the natural zeolite as well as the quality of particular particle size classes of the natural zeolite. The aim of the investigations was to determine if the different classes possess different qualitys. The starting material used in experiements was the natural zeolite from Zlatokop deposit (Vranjska Banja, Serbia).. The classes -0.2+0.8 mm; -0.8+0.6 mm; -0.6+0.4 mm; -0.4+0.1 mm were obtained by wet sieving of the natural zeolite. Grinding processes of the natural zeolite gave classes -0.3+0.63 mm; -0.63+0 mm; -0,43+0 mm. Chemical composition , mineralogical XRPD analysis and cation exchange capacity (CEC) were performed on the starting sample and the obtained particle size classes. It was determined that all particle size classes possess similar quality. The highest cation exchange capacity was observed in classes -0,043+0mm (166,5 meq/100g) and -0,063+0mm (158, 8 meq/100g).

EVALUASI PERUBAHAN KUALITAS TANAH PADA LAHAN BEKAS PENAMBANGAN NIKEL DI PULAU GEBE

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Mardi Wibowo
Keyword(s):  
Organic Carbon ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Mining Activity ◽  
Evaluation Activity ◽  
Land Quality ◽  
Environment Quality

Since year 1977 until 2005, PT. ANTAM has been exploited nickel ore resources at Gebe Island – Center ofHalmahera District – North Maluku Province. Mining activity, beside give economically advantages also causedegradation of environment quality espicially land quality. Therefore, it need evaluation activity for change ofland quality at Gebe Island after mining activity.From chemical rehabilitation aspect, post mining land and rehabilitation land indacate very lack and lackfertility (base saturated 45,87 – 99,6%; cation exchange capacity 9,43 – 12,43%; Organic Carbon 1,12 –2,31%). From availability of nutrirnt element aspect, post mining land and rehabilitation land indicate verylack and lack fertility (nitrogen 0,1 – 1,19%). Base on that data, it can be concluded that land reclamationactivity not yet achieve standart condition of chemical land.Key words : land quality, post mining lan

scholarly journals Attributes of the soil fertilized with sewage sludge and calcium and magnesium silicate

2015 ◽  
Vol 19 (11) ◽  
pp. 1107-1113 ◽  
Author(s):  
Geraldo R. Zuba Junio ◽  
Regynaldo A. Sampaio ◽  
Altina L. Nascimento ◽  
Luiz A. Fernandes ◽  
Natália N. de Lima ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Ricinus Communis ◽  
Block Design ◽  
Magnesium Silicate ◽  
Exchange Capacity ◽  
Sludge Compost ◽  
Sewage Sludge Compost ◽  
Randomized Block Design

ABSTRACTThis study aimed to evaluate the chemical attributes of an Inceptisol cultivated with castor bean (Ricinus communis L.), variety ‘BRS Energia’, fertilized with sewage sludge compost and calcium (Ca) and magnesium (Mg) silicate. The experiment was conducted at the ICA/UFMG, in a randomized block design, using a 2 x 4 factorial scheme with three replicates, and the treatments consisted of two doses of Ca-Mg silicate (0 and 1 t ha-1) and four doses of sewage sludge compost (0, 23.81, 47.62 and 71.43 t ha-1, on dry basis). Soil organic matter (OM), pH, sum of bases (SB), effective cation exchange capacity (CEC(t)), total cation exchange capacity (CEC(T)), base saturation (V%) and potential acidity (H + Al) were evaluated. There were no significant interactions between doses of sewage sludge compost and doses of Ca-Mg silicate on soil attributes, and no effect of silicate fertilization on these attributes. However, fertilization with sewage sludge compost promoted reduction in pH and increase in H + Al, OM and CEC. The dose of 71.43 t ha-1 of sewage sludge compost promoted the best soil chemical conditions.

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