Experimental investigation of the dewatering performance and product characteristics of oily scum at increased reaction time through hydrothermal treatment

Tobermorite was synthesized successfully from waste incineration fly ash by hydrothermal treatment in the presence of sodium hydroxide solution. The tobermorite synthesis was examined as a function of reaction temperature, time, and NaOH concentration. The formation of tobermorite was identified in all of the fly ash treated with NaOH at 180 °C, followed by the minor generations of sodalite and cancrinite phases with increasing NaOH concentration and extending reaction time. The NaOH-treated fly ash revealed the uptake behaviors for Cs+ and NH4+, whereas the fly ash untreated with NaOH solution did not show that. The uptake amounts of resulting products were also determined: 0.40 mmol/g for Cs+ and 0.35 mmol/g for NH4+ in the fly ash treated with 2.0 M NaOH at 180 °C for 20 h.

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Effect of Reaction Time and Hydrothermal Treatment Time on the Textural Properties of SBA-15 Synthesized Using Sodium Silicate as a Silica Source and Its Efficiency for Reducing Tobacco Smoke Toxicity

Catalysts ◽

10.3390/catal11070808 ◽

2021 ◽

Vol 11 (7) ◽

pp. 808

Author(s):

Nerea Juárez-Serrano ◽

Desiré Berenguer ◽

Isabel Martínez-Castellanos ◽

Inmaculada Blasco ◽

Maribel Beltrán ◽

...

Keyword(s):

Reaction Time ◽

Hydrothermal Treatment ◽

Sodium Silicate ◽

Tobacco Smoking ◽

Treatment Time ◽

Textural Properties ◽

Smoke Toxicity ◽

Silica Source ◽

Plant Experiment ◽

Hydrothermal Treatment Time

The synthesis of SBA-15 has been optimized using sodium silicate, an inexpensive precursor of SBA-15. In this work, the influence of synthesis times of the precipitation and the hydrothermal treatment steps, on the textural properties developed as well as for reducing the toxic compounds generated in tobacco smoking, has been studied. The hydrothermal treatment has been proved to be necessary to obtain materials with adequate performance in this particular application. Twenty-four hours of hydrothermal treatment provide materials with the best properties. Although the reaction stage usually involves the mixing of reagents during 24 h, 40 min is enough to obtain a material with stick-like morphology and typical textural properties. Moreover, between 1 and 2 h of reaction time, the material proved to have the best performance for the purpose of reducing the toxicity of the products generated during the tobacco smoking process. These results are of great significance for an eventual scaling up to industrial scale of the SBA-15 manufacturing process. Results of a pilot plant experiment in a batch of 4 kg of SBA-15 are reported.

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A comparative study on the effects of NaOH and CaCl2 additives on dewatering properties and product characteristics of oily scum via hydrothermal treatment

Fuel ◽

10.1016/j.fuel.2021.122398 ◽

2021 ◽

pp. 122398

Author(s):

Shuanghui Deng ◽

Shilin Yu ◽

Houzhang Tan ◽

Xuchao Lu ◽

Xuebin Wang

Keyword(s):

Comparative Study ◽

Hydrothermal Treatment ◽

Product Characteristics

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Experimental Investigation of Indium Extraction by Sulfuric Acid Precure Pressure-Atmospheriation Leaching from Tin Dust

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.3211 ◽

2013 ◽

Vol 634-638 ◽

pp. 3211-3215

Author(s):

Yan Jiang ◽

Gan Xie ◽

Rui Min Xiao ◽

Du Shu Huang ◽

Zi Jing Li ◽

...

Keyword(s):

Experimental Investigation ◽

Sulfuric Acid ◽

Reaction Time ◽

Tobacco Smoke ◽

Initial Temperature ◽

Curing Time ◽

Leaching Rate ◽

Solid Ratio ◽

Leaching Reaction ◽

Acid Dosage

Sulfuric Acid precure Pressure-atmospheriation leaching process from tin dust was studied. The factors had been investigated,which effects indium leaching rate,the factors are :the sulfuric acid initial temperature, curing time of heat, acid dosage, leaching reaction time, leaching temperature, the liquid-solid ratio and so on.The results show that the indium, zinc and tin leaching rate can be 96.68%, 97.70% and 0.52%,while pressure-atmospheriation leaching is carried out under the initial temperature 140°C,sulfuric acid, the time of heat aging 40 min, acid dosage and tin of tobacco smoke mass ratio0.7:1, leaching time 1.5h, leaching temperature 90°C,and the liquid-solid ratio 4:1 conditions.

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