· values of Zn, Pb, and Cu in Bohai Bay are 57 mg/kg, 11.5 mg/kg, and 19 mg/kg, respectively [41,42], and the concentration of the three metals are distinctly above the environment background values, particularly Zn, indicating the current severe pollution status of marine sediment in Bohai Bay.
The addition of fulvic acid to clay suspensions (kaolinite, illite or montmorrillonite) resulted in increased uptake of Cu, Pb, Cd, and Zn ions over the pH range 3 to 6, due to the limited solubility of one of the metal-fulvate species formed. At higher pH values, residual metal ion was retained in solution, instead of precipitating as hydroxy species.The amount of total metal ion found in ...
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· The effect of initial concentration on the adsorption of Pb(II), Cd(II), Ni(II) and Cu(II) using the kaolinite clay was examined with results shown in Fig. 3, where increasing initial metal ion concentration from 10 to 150 mg/L resulted in an increase in the metal ions adsorbed for both single metal and multi-metal competitive adsorption.
30.04.2014 · Samples containing up to 60 wt.% zinc smelting slag and 40 wt.% kaolin clay were reduced at 1050 for metals including Zn, Pb, Cd, Cu, Cr, As, Hg, Ni and Ag. Sintered bricks were shredded and grinded to powder, and then completely dissolved in the mixture of nitric acid (66 wt.%), hydrochloric acid (36 wt.%) and hydrofluoric acid (40 wt.%) .
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Pb Cr Cd*1000 Cu Zn Fig. 3. The mean concentrations of Cr, Pb, Cd (c*1000), Cu and Zn in sediments in each sampling point The same trends for Pb (concentration range 17.8÷24.1 ppm) and Cr (32.3÷70.0 ppm) were observed in the summer of 2006 , but the
· Cr, Cu, and Zn also presented values > 5, 40 and 500 times smaller, respectively. These results indicated that the high-temperature process of the chemical interaction of LS with K led to a strong chemical binding or a vitrification of hazardous elements of the initial mixtures in an insoluble condition with the formation of eco-friendly ceramics.
· The aim of the present work is to extend our work and to study the effect of changing geopolymers components (zeolitic tuff and kaolin) on their adsorption properties toward Cu (II), Ni (II), Zn (II), Cd (II) and Pb (II) metal ions. Both isothermal and kinetic studies revealed that increasing the zeolitic tuff: kaolin ratio improves the ...
Appreciable concentrations of Mn, Co, Ni, Cu, Zn, As and Pb were present and most of the Ni, Cu and Zn in the original clay fraction was retained in the deferrated kaolin concentrate.
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High-resolution analyses of sand, silt and clay fraction were realized to recognize sources of Pb, Ba, Zn, Cu, and As by natural or human activities. Twenty-seven soil samples were collected from three different areas (distinct parental materials) in the Ribeira River Valley, Adrianópolis, PR: i) area 1 - calcitic marble; ii) area 2- phyllite and mica schist; ii) area 3- Itaoca granit.
Calculated Potential Bedload Versus Real Transported Sands along the Guadiana River Estuary (Spain–Portugal)
· Kaolin as a mineral clay is composed mainly of Kaolinite (Al 2 Si 2 O 5 (OH) 4) and can be used as fuel additive capturing particle forming K-compounds. The K-compounds KOH and KCl are captured by adsorption under reducing conditions in the fuel bed by.
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· Extractions of the exchangeable amounts of Cd, Cu, Pb, and Zn in the sediments collected during the eight sampling campaigns were completed in 5 replicates, also with analytical blanks. For this, almost 1 g of previously dried sediment (0.053 mm) was agitated with 20.00 mL of HCl solution at 0.1 mol L −1 (200 rpm), for 2 hours [ 10 ], and at room temperature of around 28°C.
· Kaolin mineral is a typical clay mineral. Impurities such as iron and titanium are often embedded in kaolin particles, so the raw ore must be ground to a certain degree of fineness. Kaolinite commonly used flotation method for ultra-fine particle flotation method, double fluid layer flotation method and selective flocculation flotation method, etc.
· Geophagic clay consumption, which is an age-long cultural practice by humans and animals in many parts of the world, and particularly in Nigeria, may have long time health effects on the consumers. This is particularly so because of the relatively high concentration of harmful minerals and toxic elements. This study sought to determine the mineralogical and trace element compositions of ...
· 3.2 Kaolinite Adsorption of Cd, Cu, Ni, Zn, Pb and Cr with Ball clay (kaolinite with high plasticity) at 30 C indicates that it sorbs more ion compared to Ca-montmorillonite, illite, kaolinite and Kaolin, and has the higher affinity for cd relative to other metals
· pH 4, the adsorption capacity of meta - kaolin based ge opolymer. toward Pb (II), Cu (II), Cr (III) and Cd (II) was 0.71, 0.77, 0.38, 0.60 mmol/g adsorbent. The aim of the present work is to e x-. tend previous studies and to study different kaolin: zeolitic tuff.
· Kaolin is an important industrial mineral having numerous uses and requiring various market specifications. high brightness kaolin clays represent a continuing challenge to the producer. an advancement in this field of kaolinite clay beneficiation has been a
hematite and kaolinite, during the sintering process. Kaolin, consisting chiefly of kaolinite [Al 2Si 2O 5(OH) 4], is a common clay type, and most ce-ramics are formed with high percentages of kaolinite (40% 65%) as a raw material . Calcined kaolin is 2O
Amorphous derivatives of kaolin group minerals, characterised by high specific surfaces and/or high cation exchange capacities and a <27>Al MAS NMR spectrum having a dominant peak at < SIMILAR >55 ppm relative to Al(H2O)6<3+>. Such derivatives are ...
Distribution of Cr, Pb, Cu, Cd and Zn in sediment samples from the Dobczyce dam reservoir … 285 sediment. The concentration of Pb is very well correlated with the concentration of Fe in sediment samples (r = 0.817, n = 18), which was not observed in the
Metals, unlike the hazardous organics, cannot be degraded. Some metals, such as Cr, As, Se, and Hg, can be transformed to other oxidation states in soil, reducing their mobility and toxicity. Immobilization of metals, by mechanisms of adsorption and precipitation, will prevent movement of …
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· The addition of Pb/Zn can decrease the physical strength in the order of: Pb (5000 mg/kg)>Pb (10000 mg/kg)>Zn/Pb (5000 mg/kg)>Pb (20000 mg/kg). Further studies will be conducted to explore the leachability and durability of GMC S/S contaminated soil. 3.
· One hundred milligrams (0.1 g) of GHA-modified kaolinite clay adsorbent was added to 10 mL of 100 mg/L of each metal solution of Ni 2+, Cu 2+, Zn 2+, Cd 2+ and Pb 2+ in 50-mL capped polyethylene bottles, and pH of solutions was adjusted between 3.0–9.0 3.
This work describes the development of a process to produce zeolite X from mined kaolin clay from Kono-Boue and Chokocho, Rivers State, Nigeria. The procedures involved the beneficiation of the raw kaolin and calcinations at 850 C, to transform the kaolin to a ...
Powder Kaolin Clay. Kaolin is one of several types of clay, and is commonly referred to as China Clay or Paper Clay. It is a hydrated silica of alumina with a composition of approximately 46% SiO2; 40% Al2O3, and 14% H2O. It occurs in hexigonal plates, often
A 0.5000 g sample of geopolymers (G1) and raw mater-G7 ials (Z and K) were independently placed in a 500 mL-conical flask, to which 250 mL of 100 ppm of a standard solution of a metal ion (Cu(II), Ni(II), Zn(II), Cd(II), Pb(II)) prepared in 0.1 M NaCl was added . The
19-39919-398 2019 l ubl ll ed. Desalination and ater Treatment 105002019200 u 155 (2019) 321–328 July Effective removal of nitrate ions from aqueous solution using new clays: Tamazert kaolin treated under microwave irradiation Barkahoum ...
Oct 14, 2020 2.52 Cement (portland), clay (kaolin and montmorillonite), sand and 0.21 Lead, phosphate rock, sand and gravel (construction), silver, 6 months of 2019 were 5% and 20% higher, respectively, than those in 2018 and 49% and 60% higher
Nacrite is the rarest polytype of the kaolin minerals and is mostly related to hydrothermal systems (e.g. Buatier et al., 1996).Kaolin minerals are recorded within two hydrothermal Pb-Zn-Ag sulphide deposits in northern Kosovo, both of which are related to Late
· In the present study, removal of Cd2+, Cu2+, Ni2+ and Pb2+ from mono- and multi-metal ion aqueous solutions using natural Ca-bentonite was studied. Removal efficiency from synthetic aqueous solutions and real wastewater was investigated under various conditions such as variable concentration of metal ion, amount of clay, pH, and contact time. Increasing pH favors the removal of …
· Samples containing up to 60 wt.% zinc smelting slag and 40 wt.% kaolin clay were reduced at 1050 C for 6 h, and then sintered at 1050 C for 4 h. The recoveries of Zn and Pb from the brick are 94.5 ± 0.6% and 97.6 ± 0.2%, respectively.
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