Submicron copper powder and method for preparing same by sulfuric acid-process chemical reduction

Abstract

The invention provides a method for preparing submicron copper powder by sulfuric acid-process chemical reduction. The method comprises the following steps of: adding sulfuric acid into the mixed solution of solution of soluble sulfate and solution of colloid; adding iron sheets into the mixed solution for performing a reaction to generate high-reducibility hydrogen; adding anhydrous cupric sulfate or blue vitriol twice into the mixed solution; controlling temperature and stirring speed under the action of the high-reducibility hydrogen; and reducing copper ions into copper atoms. In the method, high-activity and low-cost hydrogen is taken as a reducing agent, so that cost is lowered and yield is increased; particle control technology is adopted, so that the obtained copper powder has fine particles, high purity and high oxidation resistance; and micro copper powder is suitable for industrial mass production and wider product use.

Description

technical field [0001] The invention relates to an ultrafine metal powder and a preparation method thereof, in particular to a submicron copper powder and a method for preparing the copper powder by chemical reduction with a sulfuric acid method. Background technique [0002] Ultrafine materials are new functional basic materials developed in the mid-1980s, and ultrafine metal materials are an important branch of them. At present, due to the excellent activity of ultrafine metal powders in the ultrafine state, there is no strict definition for metal ultrafine materials. Powders ranging from a few nanometers to thousands of nanometers can be called It is an ultrafine metal powder material. Due to the small size effect, surface interface effect, quantum scale effect and quantum tunnel effect of ultrafine metal materials, it has many different properties from conventional materials with the same composition, and has great potential in the fields of mechanics, electricity, magn...

AI Technical Summary

Problems solved by technology

As far as the physical method is concerned, the gas-phase steam method has complex equipment and high cost; the γ-ray method product is difficult to collect; the plasma method has low energy utilization rate; the product prepared by the water atomization method has a large particle size and poor formability

As far as the chemical method is concerned, the copper powder prepared by the mechanochemical method is uneven, the particle size distribution is wide, and impurities are easily introduced; the electrolysis method consumes a lot of energy and costs high; the ammonium salt disproportionation method has a low yield; Simple and easy for industrial production, but the reducing agents currently used are either highly toxic or costly, difficult to process after preparation, and low yield, resulting in high prices and unacceptable in the market, especially nano-copper powder is extremely easy to oxidize It becomes black copper oxide, it is very difficult to preserve and use, so the nano-copper powder has not been able to achieve industrial production, and the application and promotion of nano-copper powder has received great restrictions

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