Ammonium Bicarbonate (Ammonium Hydrogen Carbonate)

2021 ◽  
Keyword(s):  
Ammonium Bicarbonate ◽  
Ammonium Hydrogen Carbonate ◽  
Hydrogen Carbonate ◽  
Ammonium Hydrogen

Reactive yttrium aluminate garnet powder via coprecipitation using ammonium hydrogen carbonate as the precipitant

2000 ◽  
Vol 15 (9) ◽  
pp. 1864-1867 ◽  
Author(s):  
Ji Guang Li ◽  
Takayasu Ikegami ◽  
Jong-Heun Lee ◽  
Toshiyuki Mori ◽  
Yoshiyuki Yajima
Keyword(s):  
Theoretical Density ◽  
Mixed Solution ◽  
Vacuum Sintering ◽  
Ammonium Hydrogen Carbonate ◽  
Yttrium Aluminate ◽  
Intermediate Phases ◽  
Hydrogen Carbonate ◽  
Ammonium Hydrogen ◽  
Approximate Composition ◽  
Carbonate Precursor

Ammonium hydrogen carbonate was used as the precipitant to synthesize yttrium aluminate garnet (YAG) precursors from a mixed solution of aluminum and yttrium nitrates via coprecipitation. The carbonate precursor, with an approximate composition of NH4AlY0.6(CO3)1.9(OH)2 · 0.8H2O, transformed to pure YAG at 900 °C without the formation of intermediate phases. Reactive YAG powder was produced by calcining the precursor at 1100 °C. The YAG powder densified to 99.8% of the theoretical density by vacuum sintering at 1500 °C for 2 h, and the sintered body showed transparency. Less agglomeration of the precursor and good dispersity of the resultant YAG powder were responsible for the excellent sinterability.

Nanocrystalline Particle Coatings on α-Alumina Powders by a Carbonate Precipitation and Thermal-Assisted Combustion Route

2007 ◽  
Vol 7 (11) ◽  
pp. 3906-3909
Author(s):  
Sang Woo Kim ◽  
Young Mi Jung
Keyword(s):  
Aluminum Sulfate ◽  
Ultrafine Particle ◽  
Precipitation Reaction ◽  
Carbonate Precipitation ◽  
Surface Complexes ◽  
Ammonium Hydrogen Carbonate ◽  
Nanocrystalline Particle ◽  
Hydrogen Carbonate ◽  
Ammonium Hydrogen ◽  
Combustion Route

We have suggested ultrafine particle coating processes for preparing nanocrystalline particle coated α-alumina powders by a carbonate precipitation and thermal-assisted combustion route, which is environmentally friendly. The nanometric ammonium aluminum carbonate hydroxide (AACH) as a precursor for coating of alumina was produced from precipitation reaction of ammonium aluminum sulfate and ammonium hydrogen carbonate. The synthetic crystalline size and morphology were greatly dependent on pH and temperature. By adding ammonium aluminum sulfate solution dispersed the α-alumina core particle in the ammonium hydrogen carbonate aqueous solution, nanometric AACHwith a size of 5 nm was tightly bonded and uniformly coated on the core powder due to formation of surface complexes by the adsorption of carbonates, hydroxyl and ammonia groups on the surface of aluminum oxide. The synthetic precursor rapidly converted to amorphous- and γ-alumina phase without significant change in the morphological features through decomposition of surface complexes and thermal-assisted phase transformation. As a result, the nanocrystalline polymorphic particle coated α-alumina core powders with highly uniform distribution were prepared from the route of carbonate precipitation and thermal-assisted combustion.

Study on the Prepartion of Slag Haycite for Phosphorus Removal Using Ammonium Hydrogen Carbonate as Pore Former

2014 ◽  
Vol 887-888 ◽  
pp. 723-726
Author(s):  
Xue Lian Li ◽  
Xiao Liu ◽  
Guo Ping Cao
Keyword(s):  
Phosphorus Removal ◽  
Microbial Growth ◽  
Steel Slag ◽  
Raw Material ◽  
Pore Former ◽  
Ammonium Hydrogen Carbonate ◽  
Sintering Time ◽  
Hydrogen Carbonate ◽  
Ammonium Hydrogen ◽  
Sintering Condition

Porous slag haycite for phosphorus removal was made from slag, as the main raw material, clay, as binder, and ammonium hydrogen carbonate, as a pore forming agent. And the influence of material ratio and sintering condition were investigated. The best ratio of steel slag: Clay: ammonium hydrogen carbonate was 53.5%:42.5%:4% as ascertained, and the best sintering temperature 800°C, sintering time 60min. The porosity of slag haycite was 2 times more than original slag, and the specific surface area was increased evidently, thus very conducive to microbial growth.

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