Preparation of N-acetyl-D-glucosamine and N,N′-diacetylchitobiose by enzymatic hydrolysis of chitin with crude chitinases

碳纤维 金属 化学 冶金 水解 型煤 熔渣(焊接) 材料科学 化学工程 复合数 有机化学 复合材料 工程类
作者
Sanya Kudan,Thidarat Eksittikul,Rath Pichyangkura,Ro Dong Park
出处
期刊:Journal of Biotechnology [Elsevier BV]
卷期号:150: 89-89 被引量:9
标识
DOI:10.1016/j.jbiotec.2010.08.229
摘要

To efficiently recycle valuable metals such as chromium and nickel in stainless steel dust, self-reduction experiments were carried out to study the reduction mechanism of metal oxides in coal composite stainless steel dust hot briquette, which is defined as a CCSB here. Self-reduction of CCSB is proceeded by volatile matter and fixed carbon contained within CCSB. Experiments were performed to study the effects of temperature and carbon to oxygen (C/Ocoal) ratio on self-reduction of CCSB. At 1400 and 1450 °C, volatile matter in coal used for experiment could take the place of about 40% of fixed carbon in coal. Under the present experimental conditions, reduction product of chromium appears as FeCr2 O4, Cr2 O3, Cr7 C3, and [Cr] in turn during reduction. To evaluate the formation of metal nuggets in self-reduction process of CCSB, metal nuggets containing chromium and nickel were observed in outside of reduction products under various conditions, and thermodynamic equilibrium calculation was carried out for possible products and formation of molten metal by fixed carbon. SEM and EDS analyses were made for metal nugget and slag in reduced product. The results reveal that it is reasonable to achieve the metal nuggets at 1450 °C, 0. 8 of C/Ocoal ratio and 20 min of reduction time. The nugget formation can indicate one innovative process for comprehensive utilization of stainless steel dust.
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