Hydrochloric Acid Regeneration via Calcium Sulfate Crystallization for Non-Ferrous Chloride Leaching Processes

Ni-Co 2013 ◽  
2013 ◽  
pp. 379-389
Author(s):  
Thomas Feldmann ◽  
George P. Demopoulos
Keyword(s):  
Hydrochloric Acid ◽  
Calcium Sulfate ◽  
Ferrous Chloride ◽  
Chloride Leaching

A process for beneficiation of low-grade manganese ore and synchronous preparation of calcium sulfate whiskers during hydrochloric acid regeneration

2021 ◽  
Vol 199 ◽  
pp. 105533
Author(s):  
Mengen Lei ◽  
Baozhong Ma ◽  
Dongya Lv ◽  
Chengyan Wang ◽  
Edouard Asselin ◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
Calcium Sulfate ◽  
Low Grade ◽  
Manganese Ore ◽  
Calcium Sulfate Whiskers

scholarly journals Recovery of Tantalum and Manganese from Epoxy-Coated Solid Electrolyte Tantalum Capacitors through Selective Leaching and Chlorination Processes

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 656
Author(s):  
Wei-Sheng Chen ◽  
Chih-Yuan Hsiao ◽  
Cheng-Han Lee
Keyword(s):  
Reaction Time ◽  
Hydrochloric Acid ◽  
Solid Electrolyte ◽  
Epoxy Resin ◽  
Selective Leaching ◽  
Ferrous Chloride ◽  
Electronic Products ◽  
Solid Ratio ◽  
Chlorination Process ◽  
Acid Type

Electronic products are ever growing in popularity, and tantalum capacitors are heavily used in small electronic products. Spent epoxy-coated solid electrolyte tantalum capacitors, containing about 22 wt.% of tantalum and 8 wt.% of manganese, were treated with selective leaching by hydrochloric acid and chlorination after removing the epoxy resin, and the products converted, respectively, to Mn(OH)2 and TaCl5. The effects of acid type, acid concentration, liquid–solid ratio, and reaction time were investigated to dissolve the manganese. The optimal selective leaching conditions were determined as 3 mol/L of HCl, 40 mL/g at 25 °C for 32 min. Next, residues of selective leaching after washing and drying were heated with ferrous chloride to convert to pure TaCl5. Mixing 48 wt.% of chloride and 52 wt.% of residues for a total of 5 g was conducted to complete the chlorination process in the tube furnace at 450 °C for 3 h. A total of 2.35 g of Ta was collected and the recovery of Ta achieved 94%. Finally, Mn(OH)2 and TaCl5 were separated and purified as the products.

XVI.—On a Modification of Pelouze's Method for determining Nitrates

1915 ◽  
Vol 35 ◽  
pp. 168-169
Author(s):  
E. A. Letts ◽  
Florence W. Rea
Keyword(s):  
Hydrochloric Acid ◽  
Potassium Permanganate ◽  
Chloride Solution ◽  
Ferrous Chloride ◽  
Sodium Salts ◽  
Iron Wire ◽  
Ferrous Salt ◽  
Diluted Solution ◽  
Ferrous Chloride Solution

Pelouze, as early as 1847, employed a method for determining nitrates in the commercial potassium and sodium salts, in which weighed quantities of the latter were boiled with ferrous chloride solution (obtained by treating a definite weight of iron wire with excess of hydrochloric acid), and afterwards the remainder of the ferrous salt was determined by titration of the diluted solution with potassium permanganate.

scholarly journals Study of Hydrolization and Sedimantationin Acid Compositions Based on Sulfaminic Acid

2020 ◽  
Vol 130 (5) ◽  
pp. 32-37
Author(s):  
L. A. Magadova ◽  
◽  
A. N. Sirotin ◽  
M. D. Pakhomov ◽  
Z. R. Davletov ◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
Calcium Sulfate ◽  
Gravimetric Method ◽  
Sulfamic Acid ◽  
Hydrolysis Rate ◽  
Hydrolysis Products ◽  
Rate Of Hydrolysis ◽  
Quartz Solubility ◽  
Ammonium Sulfamate ◽  
Hydrolysis Of

This article presents the results of a study of the hydrolysis of sulfamic acid and the elaboration of acidic compositions that are characterized by reduced sedimentation compared to mud acid. The effect of complexing compounds on the hydrolysis of sulfamic acid is considered, the hydrolysis of sulfamic acid and sulfamates is compared, and the secondary sedimentation of sulfamic acid and mud acid compositions is compared using the formation of hexafluorosilicates. The hydrolysis intensity of sulfamic acid and ammonium sulfamate was determined by the mass of sediments formed during the reaction of hydrolysis products with calcium chloride. The mass of calcium sulfate formed is proportional to the rate of hydrolysis of sulfamic acid. The process of dissolution of the quartz component of the terrigenous formation was studied using the gravimetric method. Differences in influence of EDTA, HEDP, and NTP on sedimentation prevention of the products of sulfamic acid hydrolysis were studied by the example of reactions with Ca2+. It was shown that compositions with NTP are characterized by a lower sediments formation. The ratio of NTP concentration and the hydrolysis rate of sulfamic acid is shown. Differences in the hydrolysis rate of compositions based on sulfamic acid and sulfamates were determined at a temperature of 80°C. It was shown that sulfamates are characterized by a lower rate of hydrolysis. Differences in quartz solubility were determined for compositions based on sulfamic and sulfuric acids, differences in the reactions kinetics were shown. It has been established that acid compositions based on sulfamic acid are characterized by less sedimentation rate being compared with acid compositions based on hydrochloric acid by the example of hexafluorosilicates formation.

Dissolution of oxidised Co–Cu ores using hydrochloric acid in the presence of ferrous chloride

2011 ◽  
Vol 108 (3-4) ◽  
pp. 233-236 ◽  
Author(s):  
M. Clotilde Apua ◽  
A.F. Mulaba-Bafubiandi
Keyword(s):  
Hydrochloric Acid ◽  
Ferrous Chloride

Vapor-liquid equilibriums of the hydrochloric acid-ferrous chloride-water system

1970 ◽  
Vol 15 (2) ◽  
pp. 233-235 ◽  
Author(s):  
Erh Chun Chen ◽  
George McGuire ◽  
Herbert Y. Lee
Keyword(s):  
Hydrochloric Acid ◽  
Water System ◽  
Ferrous Chloride ◽  
Chloride Water ◽  
Vapor Liquid
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