摘要:
Process for reducing hexavalent chromium in oxidic solids, which comprises the steps: a) mixing of the oxidic solid containing Cr(VI) with a carbon-containing compound which is liquid in the range from 20 to 100° C., b) treatment of the mixture obtained after a) in an indirectly heated reactor at a temperature of from 700° C. to 1100° C., particularly preferably at a temperature of from 800° C. to 1000° C., under a protective atmosphere, c) cooling of the reaction product obtained after b) to at least 300° C., preferably at least 150° C., under a protective atmosphere.
摘要:
According to this production method, the water content of a mixture of a chromium oxide (Cr2O3) powder and a sodium carbonate (Na2CO3) powder is brought to 1000 ppm or less, and the mixture is heated in an inert gas atmosphere at a calcination temperature (850 DEG C.) where the sodium carbonate and the chromium oxide undergo a calcination reaction. Sodium chromite is thereby obtained.
摘要翻译:根据该制造方法,将氧化铬(Cr 2 O 3)粉末和碳酸钠(Na 2 CO 3)粉末的混合物的含水量设定为1000ppm以下,并将混合物在惰性气体气氛中以煅烧温度 (850℃),其中碳酸钠和氧化铬经历煅烧反应。 从而得到亚铬酸钠。
摘要:
A method of producing lithium metal oxides can include mixing lithium salt and a metal oxide to form a composition, heating the composition in a first reactor, transferring the composition to a second reactor, and passing the composition through the second reactor to anneal the composition to form lithium metal oxides. The second reactor can be a fluidized bed reactor. The lithium metal oxide can have an average crystal size of between about 5 microns and about 20 microns.
摘要:
The present invention provides mixed metal oxide based special effect pigments that can be incorporated into optically thin binder systems to produce a “metal flake” appearance that is superior to the “metal flake” appearance presently achievable using conventional special effect pigments. Special effect pigments according to the invention comprise at least 10 wt % of mixed metal oxides that exhibit the McConnellite (Cu1+Cr3+O2) crystal structure. Other metallic elements can be incorporated into the crystal lattice structure to alter the appearance effect of the pigments.
摘要:
Hexavalent chrome is extracted from a film on a workpiece which film contains hexavalent chrome and reduced by contacting the contacting workpiece with a liquid or fine particle reducing agent.
摘要:
The unique method of synthesis of chromium vanadate is performed using chromium chloride and sodium metavanadate. Methanol is used as a solvent. Zinc and/or palladium can be used as a catalyst. After reacting, the filtrate will be evaporated and the obtained substance is Chromium vanadate. The precipitate is sodium chloride.
摘要:
A spin electronic material exhibiting a spin-dependent electronic effect includes zincblende TE-VE, where TE stands for V, Cr or Mn and VE stands for As or Sb.
摘要:
A sensor for detecting the presence of gas and methods for use. The sensor has a low sensitivity to relative humidity and high sensitivity to the presence of gases such as carbon monoxide. The sensor is comprised of ternary oxides of the formula Cr2−x(M1zM21−z)xO3 with M1=Fe or Mn, M2=Fe, Mn, or Al, 0.005≦x≦1.95, 0.005≦z≦0.995; ternary oxides of the formula Cr2−x(M1zM21−z)xO3 with M1=Fe or Mn, M2=Ti, 0.005≦x≦1.95, 0.005≦z≦0.45; or quaternary and quinternary oxides of the formula Cr2−x((M1aM2bM3c)zM41−z)xO3 with M1=Fe, M2=Mn, M3=Al, and M4=Ti, 0≦a,b,c≦1, 0.005≦x≦1.95, and 0.005≦z≦0.45.
摘要翻译:用于检测气体存在的传感器和使用方法。 传感器对相对湿度的敏感性低,对一氧化碳等气体的敏感性高。 传感器由M1 = Fe或Mn,M2 = Fe,Mn或Al的式Cr2-x(M1zM21-z)xO3的三元氧化物组成,0.005 <= x <= 1.95,0.005 <= z <= 0.995 ; M1 = Fe或Mn,M2 = Ti,0.005 <= x <= 1.95,0.005 <= z <= 0.45的式Cr2-x(M1zM21-z)xO3的三元氧化物; 或具有M1 = Fe,M2 = Mn,M3 = Al和M4 = Ti的式Cr2-x((M1aM2bM3c)zM41-z)xO3的季铵和季铵氧化物,0 <= a,b,c < 0.005 <= x <= 1.95,0.005 <= z <= 0.45。
摘要:
In a layer structure oxide in crystallite form having a composition of the formula: AMO.sub.2 wherein A is Li or Na and M is Co, Ni, Fe or Cr, at least one additive element Z which is Bi, Pb or B is present in the form of an oxide on the surface of crystallites or between crystallites. Atomic ratio Z/M is from 0.0001 to 0.1. Since the crystallites have an increased size, the layer structure oxide has improved properties and is suitable for use as a positive electrode material of a secondary cell.
摘要:
A process for removing chromium from an aqueous electrolyte solution is disclosed. The process involves admixing with the solution an amount of a chromium-reducing compound and an amount of a precipitant for the anion of the chromium-reducing compound. The invention provides for substantially complete reduction of hexavalent chromium to trivalent chromium and the formation of an insoluble chromium-containing material without leaving unwanted ions in the aqueous electrolyte solution. The aqueous electrolyte solution is regenerated by adjustment of pH and electrolyte concentration.