Absorption of sulfur dioxide by calcium hydroxide solution in a wetted-wall column: effect of magnesium hydroxide, magnesium carbonate and magnesium su

1982 ◽  
Vol 37 (10) ◽  
pp. 1572-1575 ◽  
Author(s):  
C. Laohavichitra ◽  
K. Muroyama ◽  
Shu-Huan Weng ◽  
Liang-Shih Fan
Keyword(s):  
Sulfur Dioxide ◽  
Calcium Hydroxide ◽  
Magnesium Hydroxide ◽  
Magnesium Carbonate ◽  
Hydroxide Solution ◽  
Wetted Wall Column

Study of Carbonizing Processes for Sintered Dolomite

2007 ◽  
Vol 336-338 ◽  
pp. 2552-2555 ◽  
Author(s):  
Jing Hua Xue ◽  
Min Fang Han ◽  
Qing Yun Wang
Keyword(s):  
Calcium Carbonate ◽  
Calcium Hydroxide ◽  
Magnesium Hydroxide ◽  
Room Temperature ◽  
Xrd Analysis ◽  
Magnesium Carbonate ◽  
Crystal Phase ◽  
Carbonization Process

It is the easy and widely used way to make light calcium carbonate and magnesium carbonate from dolomite by carbonizing process. During this process, the dolomite is calcined at different temperature, from 700°C to 950°C to get the mixture including either calcium carbonate and magnesia or calcia and magnesia. Then the mixture is blended with water in different temperature from room temperature to 80°C. As a result, it is supposed to get calcium hydroxide and magnesium hydroxide, but XRD analysis reveals that it is not accord with the theory. Magnesium hydroxide can not be obtained during this reaction. After the carbonization process, the calcium carbonate and a kind of mixture which is composed with different crystal phase of Mg5(CO3)4(OH)2[H2O]4 have been produced, instead of magnesium carbonate. The magnesia is gotten when the mixture is calcined at 450~750°C.

Absorption of sulfur dioxide in calcium hydroxide solutions

1984 ◽  
Vol 23 (3) ◽  
pp. 370-373 ◽  
Author(s):  
Dasari Ram Babu ◽  
G. Narsimhan ◽  
Colin R. Phillips
Keyword(s):  
Sulfur Dioxide ◽  
Calcium Hydroxide

Absorption of Sulfur Dioxide with Sodium Hydroxide Solution in Spray Columns

2015 ◽  
Vol 54 (35) ◽  
pp. 8670-8677 ◽  
Author(s):  
Zhanke Wang ◽  
Yu Peng ◽  
Xiaocong Ren ◽  
Shaoyong Gui ◽  
Guangxu Zhang
Keyword(s):  
Sulfur Dioxide ◽  
Sodium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Hydroxide Solution

Biogas quality upgrading by carbon mineralization with calcium hydroxide solution in continuous bubble column reactor

2020 ◽  
Author(s):  
Suci Madhania ◽  
K. Kusdianto ◽  
Siti Machmudah ◽  
Tantular Nurtono ◽  
W. Widiyastuti ◽  
...  
Keyword(s):  
Calcium Hydroxide ◽  
Bubble Column ◽  
Carbon Mineralization ◽  
Bubble Column Reactor ◽  
Column Reactor ◽  
Hydroxide Solution ◽  
Quality Upgrading

scholarly journals Treatment of Sorghum Grains with Calcium Hydroxide for Calcium Enrichment

1989 ◽  
Vol 11 (2) ◽  
pp. 1-4 ◽  
Author(s):  
Pushpa Bharati ◽  
M. P. Vaidehi
Keyword(s):  
Calcium Hydroxide ◽  
Calcium Content ◽  
The Other ◽  
Untreated Sample ◽  
Soaking Time ◽  
Hydroxide Solution ◽  
Sorghum Grains ◽  
Sorghum Grain ◽  
Methods Of Treatment

Four varieties of sorghum grain (SB-1079, DSH-1, CSH-5, and SB-905) were subjected to four methods of treatment with saturated calcium hydroxide solution (soaking and drying with and without washing for germinated and ungerminated grains) for five different periods: dipping only, or 4, 8, 16, or 32 hours of soaking. Among all the varieties, treated germinated grain showed a higher calcium content than treated ungerminated grain. Irrespective of the method or duration of soaking, SB-905 showed a significantly lower calcium content than the other varieties. A maximum calcium content of 253.6 mg per 100 g of grain was obtained in the DSH-1 variety when germinated grain was soaked and dried, compared to a 55.0 mg per 100 g in the untreated sample. Washing after soaking resulted in a decreased calcium content in both germinated and ungerminated grains. Increasing the soaking time from simple dipping to four or eight hours resulted in a significant increase in calcium content. Further increases in soaking time to 16 or 32 hours caused a significant reduction in calcium content.

Light Bleaching with Metal Halide Lamps: Effects on Naturally Aged Paper

2012 ◽  
Vol 33 (3-4) ◽  
Author(s):  
Marion Verborg
Keyword(s):  
Tensile Strength ◽  
Calcium Hydroxide ◽  
High Intensity ◽  
Thermal Ageing ◽  
Metal Halide ◽  
Yellowness Index ◽  
Hydroxide Solution ◽  
Metal Halide Lamps ◽  
Bleaching Treatment ◽  
High Intensity Light

AbstractThe paper describes the effects of light bleaching with metal halide lamps on selected chemical and mechanical properties of six different naturally aged 18th-21st century papers. Treatments included: pre-washing under ambient light, prolonged immersion in a dilute calcium hydroxide solution while kept in the dark, exposure to high-intensity light in dry condition, and immersion in a dilute calcium hydroxide solution while exposed to high-intensity light (light bleaching treatment). The effects of the treatments on the papers were evaluated by the Yellowness Index (YI), pH, tensile strength (0-span tensile test) and the degree of polymerization. All these measurements and tests were repeated after artificial thermal ageing to evaluate the treatment effects over the long term. Light bleaching proved effective in reducing the yellowing in the rag paper after treatment and after ageing, although some colour reversion was observed after ageing. Light bleaching treatment brightened the chemical woodpulp paper, but the effect was nullified after ageing due to a high degree of colour reversion. Light bleaching showed only limited brightening effects on woodpulp paper after treatment; woodpulp paper samples darkened more during ageing than the rag paper and chemical woodpulp paper. Immersion in the alkaline bath increased the pH of all papers tested in this study and exposure to light in dry condition turned out to be detrimental for the pH both after exposure and after ageing. Exposure to light in dry condition and aqueous light bleaching both caused a decrease in the tensile strength of paper samples in the short-term. Light bleaching treatment caused a decrease in the degree of polymerisation of cellulose after treatment and after ageing.

Sign in / Sign up

Export Citation Format

Share Document