Method of Black Liquor Combustion to Remove Silicon from Wheat Straw Pulping

Xu, Yongjian; Sun, Hao; Xue, Li; Zhang, Dingjun; Tian, Yong

doi:10.15376/biores.10.2.1988-1997

Cited by 11 publications

(7 citation statements)

References 6 publications

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“…The precipitation may be minerals with complex structures such as Na2Al2Si2O8 and Mg6Si4O10(OH)8. This hypothesis has been validated by the authors' previous studies (Xu et al (2015a,b, Xu et al 2017, which provides a theoretical foundation for the GL desilication in the combustion of BL by adding desilication agent before pumping into the alkali recovery furnace. The method is named GL desilication via BL combustion process, and a schematic is shown in Fig.…”

Section: Introductionmentioning

confidence: 53%

Green liquor desilication via black liquor combustion process for bamboo pulping

Zhang

Pei

et al. 2022

BioRes

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The presence of silicon in non-wood raw materials is known to interfere with the causticization of green liquor and the calcination of white mud, which has provided motivation for advances in alkali recovery technology. Therefore, reducing the silicon content of green liquor is the fundamental way to solve the problem. However, there are certain defects in conventional green liquor desilication, so this study provides a basis for desilication from green liquor via black liquor combustion and studies the desilication effect of a compound desilication agent on bamboo pulping black liquor. The results show that the desilication effect was better and the desilication rate could reach 84% when the Mg/Al proportion in compound desilication agent was 1:0.6. Meanwhile, the content of residual aluminum in green liquor decreased, which can avoid the influence of residual desilication agent on subsequent stages. Scanning electron microscopic images show that green-liquor-silicon-insoluble (GLSI) substance is a granular precipitate, and the X-ray diffraction analysis shows that GLSI substance has a complex structure similar to 3Al2O3•2SiO2•MgO. This implies that the desilication mechanism consists of chemical precipitation and physical adsorption.

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Section: Introductionmentioning

confidence: 53%

Green liquor desilication via black liquor combustion process for bamboo pulping

Zhang

Pei

et al. 2022

BioRes

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“…20 °C in the peak point between the BL before and after filtration probably correlated with the existing magnitude of silica to a significant degree. Research by Miller et al (1989) and Xu et al (2015) shows that silica has a direct impact on the thermodynamic properties. Combining the peak points of the DTG curve in Fig.…”

Section: Tg Analysismentioning

confidence: 99%

“…Rice straw BL has the highest silica content among fiber materials commonly used in papermaking. Desilication of straw BL by means of acidification with stack gas and sulfuric acid (Xu et al 2015) is considered an effective method. It can help reduce and even eliminate silicon disturbance during chemical recovery of straw BL, but the increment in the solids concentration is limited, being within 3% to 5%.…”

Section: Introductionmentioning

confidence: 99%

Effects of pH and Suspended Matter on the Physico-Chemical Properties of Black Liquor from Alkali-Oxygen Pulping of Rice Straw

Zhang¹

2016

BioResources

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Black liquor (BL) can be regarded as the energy and alkali resource of the pulping mill. In this work, the effects of the characteristics of black liquor derived from the alkali-oxygen pulping of rice straw were studied. Through analyses of the chemical and physical properties, especially the thermodynamics properties, which depend on suspended matter and alkalinity, it was shown that the removal of the suspended matter from the black liquor could effectively improve its thermodynamic properties, particularly in making its solids content reach up to more than 56% at the turning point of its viscosity. Moreover, sodium salt played an important role in the presence of macromolecules and silica in the BL. When the BL was adjusted to pH = 11 with NaOH, the filtered BL had the lowest silica content, the highest volumetric isothermal expansivity (VIE), was more susceptibility to thermal cracking, and was more suitable for processing for alkali recovery.

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“…However, growing environmental policy pressure has led to a decrease of the proportion of the straw used for clean pulping in recent years so that only about 20 million tons of agricultural residuals are being used to produce paper products, and rice and wheat pulp account for only 4% currently. The inherent disadvantages, high content of ash and silicon accompanied with parenchyma cells, 9 not only make the black liquor (BL) hard to extract and concentrate but also bring about the silicon disturbance in the recovery system. 10 As a result, the BL obtained from straw pulping is hard to apply in the traditional recovery system, which becomes the bottleneck for development of straw pulping.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis Behavior of the Black Liquor Derived from Soda–Anthraquinone and Soda–Oxygen Pulping of Rice Straw at Different Reaction End Points

Zhang

2017

Energy Fuels

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Black liquor (BL) with inorganic cooking chemicals and combustible material is the alkali and power resources for pulping. For rice straw pulping, BL obtained from soda–anthraquinone (AQ) pulp (SABL) could hardly be combusted in a traditional recovery furnace, because of the involvement of a great deal of silica in it. On the contrary, soda–oxygen pulping may have the majority of the silica depositing in pulp owing to the oxidation, instead of its dissolution in the BL (SOBL). The pyrolysis behavior of SOBL was investigated in this paper, and composition and thermal degradation were comparatively studied by elemental analysis and TG-MS/FTIR. The reaction mechanism of pyrolysis of SOBL at different pulping end points is first revealed. The results suggested that SOBL had reasonable silicon content about one-eighth of that of the SABL, and the volatiles can be produced under relatively low temperature. For different reaction end points, with deeper oxidization, more volatiles were released at lower temperature.

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Method of Black Liquor Combustion to Remove Silicon from Wheat Straw Pulping

Cited by 11 publications

References 6 publications

Green liquor desilication via black liquor combustion process for bamboo pulping

Green liquor desilication via black liquor combustion process for bamboo pulping

Effects of pH and Suspended Matter on the Physico-Chemical Properties of Black Liquor from Alkali-Oxygen Pulping of Rice Straw

Pyrolysis Behavior of the Black Liquor Derived from Soda–Anthraquinone and Soda–Oxygen Pulping of Rice Straw at Different Reaction End Points

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