Method for preparing superfine nickel carbonyl powder by nickel carbonyl thermal decomposition

Abstract

The invention discloses a method that is used to prepare superfine carbonyl nickel powder by the carbonyl nickel thermal decomposition. The method is that the carbonyl nickel and the carbon monoxide gas are mixed admission the decomposer to mix with the carbon monoxide main heat source gas whose preheating temperature is from two hundred and forty centigrade degree to three hundred twenty centigrade degree to make the carbonyl nickel decompose to from superfine carbonyl nickel powder whose granularity is from twenty nanometer to ten millimeter. The pressure of the decomposer is from 0.02MPa to 0.2MPa in the whole decomposition process. The invention avoids the complicated operation of separating the mixed gas after the decomposition, simplifies the preparation technology, reduces the cost of the production, and greatly reduces the produce of the wall built up.

Description

technical field [0001] The invention relates to a method for preparing superfine nickel carbonyl powder by pyrolyzing nickel carbonyl. Background technique [0002] Ultrafine carbonyl nickel powder has great volume effect and surface effect, and exhibits many special properties in terms of magnetism, internal pressure, thermal resistance, light absorption and chemical activity, so it is widely used in energy, electronics, materials and nuclear industries and other fields. At present, the production capacity of superfine nickel carbonyl powder in the world is about 150,000 tons. Among them, the Canadian International Nickel Company (INCO) occupies about 95% of the market, and the Russian Northern Nickel Company produces about 5,000 tons of ultrafine carbonyl nickel powder, mainly for its domestic consumption. As far as its preparation method is concerned, there are no more than two kinds: one method is to use carbonyl nickel vapor mixed with carbon monoxide to enter the dec...

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Problems solved by technology

In the former, because the heat source is completely heated by the outer wall of the decomposer to achieve the conditions for the decomposition of nickel carbonyl, the wall temperature is generally required to be relatively high (about 500°C), so that the nickel carbonyl molecules will decompose and form particles on the wall when they encounter the wall during the decomposition process. Gradually grows up, producing a large amount of wall-mounted matter, which affects the particle size distribution and performance of the product; the latter uses nitrogen as the main heat source, and the carbon monoxide produced during the decomposition of nickel carbonyl will be mixed with nitrogen. Separation treatment is necessary, which increases the process complexity and production cost