scholarly journals Influence of High Chloride Concentration on pH Control in Hydroxide Precipitation of Heavy Metals

2020 ◽  
Vol 6 (2) ◽  
pp. 239-249 ◽  
Author(s):  
Marcin Stec ◽  
Barbara Jagustyn ◽  
Krzysztof Słowik ◽  
Marek Ściążko ◽  
Tomasz Iluk
Keyword(s):  
Heavy Metals ◽  
Chloride Concentration ◽  
Ph Control ◽  
High Chloride Concentration ◽  
High Chloride

Effect of Antimony on the Corrosion Resistance of Steel in Acid Solution with High Chloride Concentration

2012 ◽  
Vol 577 ◽  
pp. 109-114
Author(s):  
Shan Chen ◽  
Guo Ming Li ◽  
Xiao Yan Wang ◽  
Xue Qun Chen
Keyword(s):  
Corrosion Resistance ◽  
Acid Solution ◽  
Electrochemical Techniques ◽  
Chloride Concentration ◽  
Immersion Test ◽  
Test Results ◽  
Rust Layer ◽  
Layer Resistance ◽  
High Chloride Concentration ◽  
High Chloride

This study focused on the effect of antimony on the corrosion resistance of low alloy steel using electrochemical techniques such as dynamic scanning and EIS and immersion test in an acid solution with high chloride concentration. The potentiodynamic test showed the anodic and cathodic corrosion behavior of all specimens and the corrosion rate decreased with increasing antimony addition. EIS showed that the antimony-containing steels had higher rust layer resistance. These test results showed the addition of antimony was convenient to the enhancement of corrosion resistance of the steel in the acid solution with high chloride concentration. The tests proved that the content of antimony controlled to 0.12% in the steel showed the best corrosion resistance.

Saving of Water and Chemicals in Tanning Industry by Membrane Processes

1999 ◽  
Vol 40 (4-5) ◽  
pp. 443-450 ◽  
Author(s):  
A. Cassano ◽  
R. Molinari ◽  
E. Drioli
Keyword(s):  
Waste Water ◽  
Reverse Osmosis ◽  
Concentrate Solution ◽  
Salt Content ◽  
Chloride Concentration ◽  
Chemical Precipitation ◽  
Chromium Concentration ◽  
High Salt Content ◽  
High Chloride Concentration ◽  
High Chloride

Some results on pressure-driven membrane operations able to improve chromium recovery from spent chromium tanning baths and to desalinate water discharged from filterpress after Cr(III) precipitation are reported. Nanofiltration was employed to concentrate chromium(III) using a spiral-wound module. Chromium concentration and COD in permeate were respectively about zero and 2–3 g/l as compared to initial feed values of 2.8 and 5.2 g/l; the high chloride concentration in the permeate suggested to reuse this solution in the pickling step saving fresh water and salts. The concentrate solution presented a higher chromium purification with respect to initial feed. It was tested in retanning, and after further concentration by chemical precipitation-dissolution method, in tanning operations. Chemical and physical analyses on leather treated with these solutions showed similar characteristics with respect to use of traditional chromium solution. Reverse osmosis was employed to reduce the high salt content in waste water from filter pressing of chromium hydroxide panels. Good rejection of reverse osmosis membrane to chloride and sulphate ions suggested the use of this operation for obtaining water, to be used in washings, or to sent to biological treatment of final waste water.

scholarly journals PENERAPAN PERSAMAAN GEOTERMOMETER (SiO2)p DI LAPANGAN PANAS BUMI SULI, AMBON

2012 ◽  
Vol 6 (2) ◽  
pp. 33-36
Author(s):  
Helda Handayani
Keyword(s):  
Hot Springs ◽  
Hot Spring ◽  
Chloride Concentration ◽  
Hot Water ◽  
Reservoir Temperature ◽  
A Value ◽  
Calculation Results ◽  
High Chloride Concentration ◽  
Rms Error ◽  
High Chloride

Suli hot springs area has a low level of acidity or neutral pH ranges (7,2–7,7). It is also supported by a high chloride concentration value, which ranges (208,87-226,27) ppm. Thisshows that the area on station 1, 2, 3, and 4 are located in areas with water flow into the upper reservoir (upflow) and belongs to hot water domination reservoir tipe (water heatedreservoir). Reservoir temperature is calculated by the formula geotermometer (SiO2)p considered whether applied in the four kinds geotermometer equation because it gives the calculation results are not much different temperature and has a value of rms-error is less than 2%. Reservoir temperature at a hot springs station Suli possible temperature (161 ± 0,9)oC. Reservoir temperature at station 2 hot spring Suli possible hot water temperature (172 ± 1,0)oC. Reservoir temperature at station 3 hot springs Suli possible temperature (171 ±0,9)oC. Reservoir temperature at station 4 hot springs Suli possible temperature (169 ± 1,0)oC.

Sign in / Sign up

Export Citation Format

Share Document