Copper-nickel powder mixtures

Fio. 51. Thermomagnetic curves for copper-nickel powder mixture as a function of... 

Scientists from Politecnico di Milano and Ineos Vinyls UK developed a tubular fixed-bed reactor comprising a metallic monolith [30]. The walls were coated with catalytically active material and the monolith pieces were loaded lengthwise. Corning, the world leader in ceramic structured supports, developed metallic supports with straight channels, zig-zag channels, and wall-flow channels. They were produced by extrusion of metal powders, for example, copper, fin, zinc, aluminum, iron, silver, nickel, and mixtures and alloys [31]. An alternative method is extrusion of softened bulk metal feed, for example, aluminum, copper, and their alloys. The metal surface can be covered with carbon, carbides, and alumina, using a CVD technique [32]. For metal monoliths, it is to be expected that the main resistance lies at the interface between reactor wall and monolith. Corning... 

Two other refining processes are also frequently employed. One involves hydrometallurgical refining in which sulfide concentrates are leached with ammonia solution to convert the copper, nickel, and cobalt sulfides into their complex amines. Copper is precipitated from this solution upon heating. Under such conditions, the sulfide-amine mixture of nickel and cobalt are oxidized to their sulfates. The sulfates then are reduced to metalhc nickel and cobalt by heating with hydrogen at elevated temperatures under pressure. The metals are obtained in their powder form. 

For the range up to 170 °C, most sensors are based on NTCs. These resistors are made of powder mixtures of metal oxides such as iron, zinc, cobalt, manganese, copper, and nickel. These powder mixtures are formed into discs or wafers and sintered at high temperatures between 1000 and 1400 °C. The cured product is a ceramic material. 

ANTIREN (110-85-0) Combustible solid (flash point I90°F/88°C). Dust or powder forms explosive mixture with air. Violent or explosive reaction with strong oxidizers, strong acids, dicyanofurazan, 3-(3-cyano-l,2,4-oxadiazol-5-yl)-4-cyanofurazan-2-(5-)oxide. Reacts with nitrogenous compounds, carbon tetrachloride. Aqueous solution is a strong base. Incompatible with alcohols, aldehydes, alkylene oxides, alkalis, cresols, caprolactam solution, epichloro-hydrin, organic anhydrides, glycols, maleic anhydride, phenols. Attacks aluminum, cobalt, copper, nickel, magnesium, and zinc. 

Many of the following powdered metals reacted violently or explosively with fused ammonium nitrate below 200°C aluminium, antimony, bismuth, cadmium, chromium, cobalt, copper, iron, lead, magnesium, manganese, nickel, tin, zinc also brass and stainless steel. Mixtures with aluminium powder are used as the commercial explosive Ammonal. Sodium reacts to form the yellow explosive compound sodium hyponitrite, and presence of potassium sensitises the nitrate to shock [1], Shock-sensitivity of mixtures of ammonium nitrate and powdered metals decreases in the order titanium, tin, aluminium, magnesium, zinc, lead, iron, antimony, copper [2], Contact between molten aluminium and the salt is violently explosive, apparently there is a considerable risk of this happening in scrap remelting [3],... 

Morris [814] separated microgram amounts of vanadium, chromium, manganese, iron, cobalt, nickel, copper, and zinc from 800 ml of seawater by precipitation with ammonium tetramethylenedithiocarbamate, and extraction of the chelates at pH 2.5 with methylisobutyl ketone. Solvent was removed from the extract, the residue was dissolved in 25% nitric acid, and the inorganic residue was dispersed in powdered cellulose. The mixture was pressed into a pellet for X-ray fluorescence measurements. The detection limit was 0.14 pig or better when a 10 min counting period was used. 

---