Refining mechanisms of arsenic during preparation process of ultrafine WC powder by nitridation−carbonization method. Author links open overlay panel Zhi-qiang YI a, Dun ... However, due to the decomposition of APT during the calcination process, a large amount of ammonia and water vapor were produced, resulting in cracks on the surface. …
The stabilization process involved converting the arsenic oxide contained in the flue dust to calcium arsenate and arsenite by low temperature air roasting in the presence of lime. The calcium arsenate and arsenite were then dissolved in a molten iron silicate slag matrix. The incorporation of up to 23.5% arsenic into the slags was …
Elemental arsenic was analyzed using an ICP-ES/MS analyzer. As a result of the characterizations, a majority of the arsenic mass was found in the waste material for all temperatures. It was concluded that arsenic is carried on the surface of gangue minerals in the calcination process.
The removal capacity of arsenic(III), As(III), by the reused sanding wastes prepared at different calcination temperatures was investigated in this study. As a pretreatment process for the preparation of the reused material from raw sanding wastes (RSW), calcination was performed in a furnace at 550, 750, 900, 1100, and 1300 °C.
The key process requirements for arsenic removal from metal concentrates (copper and nickel) and ores (gold) by roasting are summarized from open literature. A …
Arsenic volatilization during calcination and arsenic speciation in ceramsite. The above experimental results confirmed that the leaching concentration of arsenic from ceramsite was well below the environmental standard limit, implying that its adverse …
During the scrubbing process of smelting flue gas, a large quantity of arsenic-containing acidic wastewater (ACAW) is produced, which usually contains 2–15 g/L arsenic. In China, nonferrous smelting acidic wastewater has become one of the main sources of arsenic pollution due to its high acidity, high arsenic concentration, and …
This paper, produced by RILEM TC 282-CCL on calcined clays as supple-mentary cementitious materials (working group 2), focuses on the production of calcined clays, presents an overview of clay mining, and assesses the current state of the art in clay calcination technology, covering the most relevant aspects from the clay deposit to the …
The presence of elevated concentration of arsenic in water sources is considered to be health hazard globally. Calcination process is known to change the surface efficacy of the adsorbent. In current study, five adsorbent composites: uncalcined and calcined Fe3O4-HBC prepared at different temperatures (400°C and 1000°C) and …
Calcination process is known to change the surface efficacy of the adsorbent. In current study, five adsorbent composites: uncalcined and calcined Fe3O4-HBC prepared at different temperatur … The presence of elevated concentration of arsenic in water sources is considered to be health hazard globally.
Phosphate concentration (0.0l mM or higher) strongly inhibited As(V) and As(III) removal through the mechanism of competitive adsorption. This study suggests …
Q. Assertion :In metallurgy calcination use for purification of metals Reason: Calcination is a chemical process wherein a carbonate ore or an oxide ore is strongly heated in the absence of air, to decompose it to remove volatile matter and moisture. Q. State the given statement is true or false. Statement: In calcination and roasting, volatile ...
At a higher calcination temperature, a larger proportion of organic matter was removed and the adsorption capacity for As (V) was 5.4–8.7 times greater than that of the raw adsorbent. However, calcination at 500 °C changed the structure of aluminum oxide into a crystallized form, reduced the surface area, and the adsorption capacity for As ...
Calcination is a process of heating a substance under controlled temperature and in a controlled environment. This process is known to improve the chroma, tinctorial strength, pigmentary texture, weather stability, light-fastness and thermal stability of pigment whereas it has adverse effect on the dispersibility of pigments.
0. Yes in calcination, with limited supply carbonates are reduced to oxides and to remove organic matter or to remove water of crystallization or evaporation of volatile components such as arsenic or antimony vapors. If the oxygen component is more it would actually be then a roasting process where sulfides are converted to oxides since they ...
Article. Authors. Metrics. Comments. Media Coverage. Abstract. Figures. Abstract. The presence of elevated concentration of arsenic in water sources is …
The products of stepped calcination of pyrite–arsenopyrite concentrates contain ferric arsenate phases FeAsO4, Fe4As2O11, Fe3(AsO4)2. The article reports the research data on leaching of calcines in alkaline medium including caustic soda and hydrogen peroxide used as an oxidizer. The experiments prove the efficiency of alkaline …
Modification of alum sludge by calcination was evaluated to enhance the adsorption capacity of a sorbent for As (V). The calcination process was effective at removing the natural organic matter, which covered the surface of ABA. Important factors, such as OH and Al O groups, were not changed by the calcination process.
2.6 Process monitoring, emissions, and quality control. In practice, the calcination of any particular clay mineral is usually optimal within a relatively narrow range of temperatures. Calcination outside this range of temperatures will lead to …
Author Index Volume 30 Author Index Volume 30 containing arsenic are common industrial problems. Many examples (of waste materials for which an acknowledged environmentally safe method of treat ment and/or storage must be found) can be cited to illustrate the magnitude of the arsenic waste problem: Common sources …
Article 26 January 2021. Introduction. Since high-arsenic copper concentrates with > 0.3 wt pct arsenic cannot be processed by conventional smelting-converting processes, they …
CaO is more effective than SiO2 in decreasing the liquidus temperature of the slag and arsenic content in the blister copper during the converting process. …
In this study, a bimetallic composite catalyst (Co-Fe@C) was fabricated with calcination at high temperature (800 °C) by using Co-MIL-101 (Fe) as the precursor. The characterization results showed that the resulted Co-Fe@C composite mainly consisted of carbon, FeCo alloys, Fe 3 O 4, Co 3 O 4 and FeO, and owned evident magnetism.
The calcination data showed that the material which has undergone washing process achieved the best impurity removal. The As content of the samples prior to calcination XRD patterns of calcined ...
The key process requirements for arsenic removal from metal concentrates (copper and nickel) and ores (gold) by roasting are summarized from open literature. A simple flow diagram is presented for ...
DOI: 10.1016/J.JCLEPRO.2017.12.153 Corpus ID: 158194307; Enhanced adsorption of arsenic onto alum sludge modified by calcination @article{Jeon2018EnhancedAO, title={Enhanced adsorption of arsenic onto alum sludge modified by calcination}, author={Eun-Ki Jeon and So-Ri Ryu and Sung-Woo Park and Lei Wang and Daniel C W …
Calcination is a process in which ore is heated in the absence of air. As a result of which the ___ ore is converted into its oxide. A metal forms two oxides. The higher oxide contains 80% metal 0.72g of lower oxide gives 0.8g higher oxide when oxidised. Then the ratio of oxygen that combines with the fixed weight of metal in the two oxides ...