Recovery of high purity sulfuric acid from the waste acid in toluene nitration process by rectification

Chemosphere ◽  
2013 ◽  
Vol 90 (4) ◽  
pp. 1558-1562 ◽  
Author(s):  
Kai Song ◽  
Qingqiang Meng ◽  
Fan Shu ◽  
Zhengfang Ye
Keyword(s):  
Sulfuric Acid ◽  
High Purity ◽  
Waste Acid

Zinc carbonate recovery from brass melting slag

2021 ◽  
Vol 98 ◽  
pp. 14-18
Author(s):  
Thao Nguyen Thi ◽  
◽  
Nam Pham Ky ◽  
Ngoc Tran Vu Diem
Keyword(s):  
Sulfuric Acid ◽  
High Purity ◽  
Room Temperature ◽  
Ph Value ◽  
Zinc Carbonate ◽  
Leaching Solution ◽  
Optimized Conditions ◽  
Melting Slag

Brass melting slag (20.38 wt.% Zn) was leached in sulfuric acid with concentration of (50 + 80) g/l H2SO4, leaching temperature of (30 + 60) °C for (30 + 120) min. The optimized conditions for 94.16% Zn extraction from brass melting slag were found as 70 g/l H2SO4, room temperature and 90 min. The leaching solution was purified by removal of Fe through Fe(OH)3 precipitation when adding ZnO to adjust pH value of 5. The solution was continuously cemented by Zn metal at 60 °C for 60 min to obtain Cu metal with high purity of 99 wt.% Cu. The purified solution with 37.64 g/l Zn was modified by Na2C03 to have pH value of about 6 and precipitation of ZnC03 (94.14 %).

New advances in crystal growth of high purity berlinite: a new solvent the sulfuric acid

2003 ◽  
Author(s):  
E. Philippot ◽  
A. Goiffon ◽  
J.C. Jumas ◽  
C. Avinens ◽  
J. Detaint ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Sulfuric Acid ◽  
High Purity

Preparation Research of CaB6 Powder by Self-Propagating High-Temperature Synthesis

2011 ◽  
Vol 284-286 ◽  
pp. 2106-2109 ◽  
Author(s):  
Yi Yong Wang ◽  
Hui Jin
Keyword(s):  
Sulfuric Acid ◽  
High Temperature ◽  
High Purity ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Vacuum Atmosphere ◽  
Reaction Atmosphere ◽  
Shs Method ◽  
Magnesium Addition

Self-propagating High-temperature Synthesis (SHS) method was adopted to synthesize powder containing CaB6, and the power was leaching by sulfuric acid. Effects of reaction atmosphere, magnesium addition, H2SO4acidity and leaching temperature on the performances of CaB6powderwas investigated, the microstructure of products were researched by SEM and XRD, the results show that the phases of products by SHS are CaB6、Mg3B2O6and Ca3B2O6, and high purity CaB6powders are obtained after the products by SHS was leaching by Sulfuric acid. The SHS conditions are the vacuum atmosphere and 30% excessive magnesium addition and the leaching conditions are 55% acidity of Sulfuric acid and 40°C leaching temperature, the perfect and uniform grain of CaB6powers are obtained at the above conditions.

Development of a technology for the production of high-purity Al2O3 powders based on raw materials from the Ural region

2020 ◽  
pp. 20-23
Author(s):  
I. D. Kashcheev ◽  
K. G. Zemlyanoy ◽  
A. V. Doronin
Keyword(s):  
Aqueous Solution ◽  
Sulfuric Acid ◽  
Aluminum Hydroxide ◽  
High Purity ◽  
Raw Materials ◽  
Acid Leaching ◽  
Environmental Problems ◽  
Ural Region ◽  
Sulfuric Acid Leaching ◽  
Granulation Process

This article is devoted to the integrated use of technogenic and natural aluminous raw materials in order to extract valuable components while solving environmental problems. The analysis of the granulation process of kaolin in the Ural region with the addition of an aqueous solution of sulfuric acid and subsequent firing of granules is carried out. Sulfuric acid leaching of kaolin-containing raw materials at various acid concentrations and the duration of the precipitate was considered. The obtained aluminum hydroxide powders were certified.

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