-
- دوشنبه تا شنبه: 10:00 - 16:00 / یکشنبه تعطیل است
This paper presents a soft sensor model for a high-pressure digestion process to control the raw material proportioning for the bauxite slurry blending process in the alumina metallurgical industry.
به خواندن ادامه دهید
The digestion process of the alumina refinery is the tube-digestion process. A total of nine-stage preheating tube heat exchanger is set up. The heating medium of the preheating …
به خواندن ادامه دهید
SEM images of (a) raw alumina particles and (b) alumina particles encapsulated with amorphous alumina [127]. Feng [ 71 ] employed binder jetting to print porous Si 3 N 4 ceramics and, then, introduced SiC matrix into porous ceramics via CVI to fabricate Si 3 N 4 -SiC composite ceramics.
به خواندن ادامه دهید
A modern alumina refinery requires a laboratory to supply it with analytical data on a wide range of process streams. The data allows monitoring, optimization, control and …
به خواندن ادامه دهید
Anaerobic digestion is a well-known technology and has been widely used for waste management, waste treatment, production of value-added products, and energy recovery. However, it still has social, economic, and technological challenges mainly caused by volatile fatty-acid accumulation, instability, ing, low buffer capacity, and high …
به خواندن ادامه دهید
Thus, the exergy optimization model of the double-stream alumina digestion is established, and the digestion process is divided into three stages based on the degree of scab in a pickling cycle.
به خواندن ادامه دهید
different parameters in the digestion step were in vestigated including test portion, digestion temperature, the reag ent used and duration of the digestion to assess the aluminium extraction.
به خواندن ادامه دهید
alumina digestion process, determine the product quality, process costs and the environment pollution. Previously, they were set by the technical workers according to the offline analysis results and an empirical formula, which leads to unstable process indices and high consumption frequently. So, a multi-objective optimization model is built ...
به خواندن ادامه دهید
Drawing from our vast experience in designing alumina Gas Suspension Calciners (GSC), our latest innovations reduce cost, conserve energy and improve product quality. As the creators of the most advanced alumina calciner systems in the industry, we value staying at the forefront of research and development. Our experts analysed every
به خواندن ادامه دهید
Gas accumulation in digestion equipment led to an explosion at Stade in 1982, ... more so under high temperature conditions. Iron in liquor was correlated by Roach and Jameison to a range of parameters including digestion ... D.J. Wilson et al, Fluoride chemistry in the Bayer process, in Alumina Quality Workshop, pp. 281–287 (2002 ...
به خواندن ادامه دهید
Acid Digestion of Sediments, Sludges, and Soils. Microwave digestion 6 a. Generic procedure b. U.S. EPA 3051A. 7. Microwave Assisted Acid Digestion of Sediments, Sludges, and Oils. c. China HJ 832-2017. 11. Soil and sediment – Digestion of total metal elements – Microwave assisted acid digestion method. Part 2 Food and beverage …
به خواندن ادامه دهید
Bauxite residue (BR) is generated as a by-product of the Bayer process. Approximately 1.2 tons of BR is generated per ton of alumina production but the quantity of bauxite residue depends upon on the quality of the processed bauxite ore and the processing parameter (Primary Aluminium Production).The annual generation of BR in …
به خواندن ادامه دهید
The α phase content of alumina is an important quality parameter for use of alumina in ceramics, catalysts and other industries/applications. ... -Al 2 O 3 reference material for determination by powder diffraction method has been developed under the optimum production equipment and technological parameters, ... the cell parameters …
به خواندن ادامه دهید
A new roasting process with a conveying bed was constructed and used to remove sulfur of high-sulfur bauxite. Roasting temperature, phase transformation, microcrystal, specific surface area of high-sulfur bauxite, and the mechanism of the reaction during the roasting process were analyzed. The digestion properties of roasted bauxite …
به خواندن ادامه دهید
Semantic Scholar extracted view of "Soft sensor and expert control for blending and digestion process in alumina metallurgical industry" by Yong-gang Li et al. ... (DTD) method is proposed for real-time monitoring, evaluation, and optimization of process parameters that are strongly related to product quality and clearly outperforms its ...
به خواندن ادامه دهید
The study has shown that the energy efficiency of the ETI alumina plant can be improved in the digestion area by lowering the molar ratio and in the evaporation area by by-passing …
به خواندن ادامه دهید
Its main flow is an electrolytic solution composed of various ions with solid components in the form of slurry. Processes such as water to vapour phase conversion and vice versa, heat exchange ...
به خواندن ادامه دهید
This shows that in an alumina refinery, bauxite quality plays an important role in achieving the desired digestion efficiency while keeping the other parameters constant . Here the increase in digestion efficiency above 1 mm particle size is due to the enrichment of alumina and reduction in silica content as seen in Table 3 .
به خواندن ادامه دهید
DIGESTION Alumina dissolution in digestion is, from a thermodynamic point of view, primarily controlled by the following parameters: The alumina mineral phase; Extraction liquor caustic concentration; Digestion temperature. The relationship between these parameters is shown in Figure 1. 0.800 0.700 0 0.600 ~ ~ 0.500 0.400
به خواندن ادامه دهید
The Specific Surface Area (SSA) reduced from 128 m 2 /g at 900 °C to 69 m 2 /g when the wall temperature was increased to 1120 °C. A similar trend in LOI was observed in the moisture-bound aluminum hydroxide raw material. The SSA decreased from 185 m 2 /g at 750 °C to 84 m 2 /g at 1050 °C. Alumina conversion to SGA quality …
به خواندن ادامه دهید
The quality parameters are influenced in different areas of the process. The table below shows a high level summary of, where the main areas are, in which the quality can be …
به خواندن ادامه دهید
Criteria that vary by multiple parameters, including Other water quality parameters such as dissolved for aluminum, copper, and selenium, rely on a more organic carbon (DOC), hardness (calcium carbonate), complex equation. See EPA's Aquatic Life Criteria pH, and temperature affect the toxicity of some metals.
به خواندن ادامه دهید
Alumina 14.9 Mt CO₂-e | 40% 4.0 3.0 2.0 1.0 0.0 0 25 50 75 100 CO₂/t of Alumina Global Australia Cumulative Alumina Production % Australian Aluminium Council September 2021 ... DIGESTION CALCINATION 63% 31% ELECTRICAL PUMPS, FANS, CONVEYORS etc. 5% Australian Aluminium Council
به خواندن ادامه دهید
As the Bauxite and Alumina industry currently face important market challenges, a key objective is to improve and optimize the overall process chain, from bauxite mining and …
به خواندن ادامه دهید
The use of innovative high-capacity, single-stream tube digestion technology reduces refinery complexity and improves energy efficiency. Tube digestion replaces the …
به خواندن ادامه دهید
However, it is well known that the digestion of bauxites with low iron often results in pregnant liquors with high iron content and, as a consequence, this leads to high iron content in the ...
به خواندن ادامه دهید
The adsorption isotherms parameters were fitted by using Origin® software (version 9.1, Origin Lab Corporation, USA). ... For chemical oxygen demand measurement of the aluminum extract, 2.0 mL of the sample was added to a COD digestion vials and heated to 150 °C for 2 h. ... adsorption performance from the synthesized boehmite and …
به خواندن ادامه دهید
1. Introduction. Alumina is an original critical material for defense construction and economic development, with applications in aircraft, electrical electronics, construction, materials, chemical medicine, and other fields [1], [2], [3], [4].The established global system for the alumina industry reached over 135 million tons in 2021 [5], [6].More than 95% of …
به خواندن ادامه دهید
The optimum quality or cost of alumina is not an exceptional set of values for production parameters, but a sequence of dynamically changing states, since these factors are variable in time. The cost and quality of alumina ultimately depends on finding this dynamic optimum and maintaining it.
به خواندن ادامه دهید
Keywords: high-sulfur bauxite; roasting; conveying bed; desulfurization; activation; digestion 1. Introduction Bauxite, the main raw material for aluminum production, is rapidly consumed with the development of modern industry. High-sulfur bauxite, a …
به خواندن ادامه دهید