Papers by Keyword: White Mud

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Authors: Yong Jin Liao, Qing Shan Yang, Yu Jia Wang
Abstract: White mud is generally known as the residue of soda ash production by ammonia-soda process. The treatment of it has been one problem in soda ash industry due to the large amount of production, strong alkalinity and corrosiveness. In China, the treatment of white mud is stacking currently, which not only occupying land but also causing environment pollution. The main composition of it is the calcium carbonate. If white mud replaces the limestone as the desulfurization agent in wet Flue Gas Desulfurization (W-FGD) system, it can attain the goal of treating the waste with another, achieve the circular economy between enterprises, and reduce the desulfurization cost significantly. In this paper, the research of white mud in 660 MW Unit W-FGD systems was investigated. Study shows that the properties of white mud and limestone are significantly different. Because of smaller particle size and active MgO, the alkaline and reaction activity of white mud are better than that of limestone, results to higher desulfurization rate and lower running cost. However, the purity of white mud is lower because of CaSO4, Cl-, and other impurities, so the dewatering system of gypsum needs to increase output by about 17%; the output of the slurry feed system needs to be increased by about 30%; the discharge capacity of wastewater needs to be increased by about 23 t/h.
Authors: Ai Peng Jiang, Jian Wang, Chun Lin Wang, Qiang Ding, Zhou Shu Jiang
Abstract: White mud is a kind of solid waste from the papermaking process, because of the high pH value and desulfurization material, it can be used as a desulfurization agent. Coal slury is the waste from the coal washing process and generally be used as fuel. This paper studies the hybrid method for white mud and coal slurry to be transported by pipeline, and the furnace desulfurization effect with the mixture. Rheological properties of coal slury and white mud was analyzed, and then based on the rheological data the coal slurry, white mud and water mixed strategy was obtained. By altering calcium sulfur ratio and operation parameters of boiler, fluidizing bed boiler desulphurization effect was tested with the mixture, the economic analysis was also performed through comparision of operational cost. The result shows that the proposed hybrid method is not only relatively simple, but also has the characteristics of good desulfurization effect, high desulfurization efficiency, and good economy. The study has important guiding meaning for desulphurization of coal slurry fluidized bed boiler.
Authors: Rong Kun Hong, Wei Gao, Ping Fan Hu, Tao Yang, Shao Shun Zhang, Yong Jin Liao, Yong Chen
Abstract: In this paper, a field experiment of gas wet desulphurization with white mud and gypsum has been taken on one thermal power plant under the condition that the desulphurization system has not been renovated. the experimental result shows that the desulphurization ability of white mud is about 2% higher than limestone under the same PH value, so it’s feasible to apply the white mud as desulfurizer to the desulphurization system of large-scale thermal power plant, and the gypsum obtained after the desulphurization is better than that in limestone system, then the waste is all utilized. However, in practice, there is a need to increase the equipments for the corresponding slurry storage, preparation and supply, and also a capacity assessment for the dewatering system, wastes water system and process water system.
Authors: Xu Zhang, Yun Yan, Lin Yang, Fei Lin Xie, Zhi Hua Hu
Abstract: In this paper, non-fired load-bearing wall bricks were prepared with high volume of white mud and CFBC fuel ash in laboratory scale. The effect of manufacturing parameters on the performances of the brick, such as mechanical properties, antifreeze and dry shrinkage, etc., were investigated. The impact of different curing regimes on these performances of the bricks with various raw materials formula has also been investigated. The experimental results show that the compressive strength of the brick could come up to 25.1MPa and the all other performances can meet Chinese national standard requirements. The best formula that bricks having the best performance is when the white mud dosage is 30%, and the best curing regime is autoclaved 180°C, 10h. The microstructure of the brick was examined by FESEM, XRD and EDS. Tobermorite (C5S6H5) has been generated at this time, which has a better crystallinity and has a higher silicon polymerization degree.
Authors: Yan Chen, Xiao Yan Lin, Wei Xing Wang
Abstract: The influences of preparing conditions on mechanical properties of the white mud (WM) / Konjac glucomannan (KGM) composite film (MKG) were investigated by orthogonal experiments. Zeta potential analysis and DSC were used to characterize the properties of WM and MKG. The results show that the mechanical properties of MKG films can be enhanced through proper modification. Optimized processing parameters of MKG film are described as following: the ratio of KGM, WM, benzoic acid, sodium dodecyl benzene sulfonate(LAS) and stearic acid was 100:14:2:0.24:0.14. 1.00 (wt) % of KGM powder was swelled in deionized water with WM modified by stearic acid, benzoic acid and LAS, stirred for 1.5 hour at 60°C and then paved on plate and dried at 40°C for 15 h to form the MKG film.
Authors: Ping Zhang, Xin Xing Xia, Feng Liu
Abstract: Through improving the traditional causticization process, such as needle-like White Mud and rice-like White Mud are obtained by adding auxiliary agent and controlling the causticizing reaction conditions. Results show that the uniform needle-like White Mud and rice-like White Mud can be better applied to paper filling, especially the needle-like White Mud, which demonstrates higher opacity and higher whiteness than commercial PCC, while has the same influence on strength and other properties with commercial PCC.
Authors: Tao Wu, De Jun Sun, Yu Jiang Li, Guo Chen Zhang
Abstract: A leaching solution of white mud was prepared from this waste material of soda production, and used for treatment of waste cutting oil emulsion. In alkaline conditions, the leaching solution of white mud generates hydroxide precipitates, which have relatively high specific surface area and excess surface energy, and readily adsorb the pollutants in waste cutting oil emulsion. The chemical composition of the white mud was determined and the hydroxide precipitates were characterized. The maximum removal efficiency (of turbidity, oil contents and TOC) was obtained at an adsorbent dosage of 4.0 g/L, pH 12.0 and 25°C. Leaching solutions of white mud could be used as an effective and low-cost material for treatment of waste cutting oil emulsion by the precipitation method.
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