Superfine cupper powder and preparation method thereof

Abstract

The invention provides a preparation method of superfine cupper powder, which takes copper slag generated by hydrometallurgy of zinc as a raw material and is characterized by comprising the following steps: soaking the cupper slag in a sulfuric acid solution for pretreatment; filtering and drying; carrying out oxidization roasting to obtain roasted cupper slag; leaching the roasted cupper slag out by the sulfuric acid solution to obtain lixivium i.e. copper-bath; carrying out purification treatment on the copper-bath; and adjusting the pH value of the purified copper-bath; adding glucose in the copper-bath for pre-reduction to obtain the cuprous oxide sediment; adding a hydrazine hydrate solution in the cuprous oxide sediment to carry out reduction reaction to obtain solid reduced copper powder; and filtering the reduced copper powder, washing, drying and carrying out polished finish to obtain the superfine copper powder. The invention has the copper recovering rate as high as over 95% and simple process, produces the superfine cupper powder by hydrometallurgy of zinc with low cost and wide sources, and has the economic feasibility of industrialization production in a large scale.

Description

technical field [0001] The invention relates to an ultrafine powder material and a production method thereof, in particular to an ultrafine copper powder and a production method thereof. Background technique [0002] Metal ultrafine particles have large specific surface area and high surface energy, which make them have many peculiar physical and chemical properties, and have extremely important application value in the fields of metallurgy, chemical industry, light industry, electronics, national defense, nuclear technology and aerospace . For example, ultra-fine copper powder can be used as chemical coatings, pigments, high-efficiency catalysts, conductive coatings, raw materials for conductive composite materials, electrode materials, additives, etc. [0003] There are many raw materials for producing ultrafine copper powder in the prior art, such as copper concentrate, spent catalyst, spent copper and copper sulfate. And often have the slag that is rich in copper to pr...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent 200810162684.X discloses a preparation method of anti-oxidation fine copper powder, which uses soluble divalent copper salt as the starting material, adds dispersant and trace additives, and uses hydrazine hydrate as reducing agent to obtain pure copper powder through two-stage reduction. For copper powder, hydrazine hydrate is a good reducing agent, and no new impurities will be introduced after reduction. It is often used as a reducing agent for preparing copper powder. However, because this method needs to add dispersants and additives, certain impurities are brought in, and it will cause problems. The price of raw materials is relatively high, and it is not economically feasible for industrial production

Chinese patent 200810097400.3 discloses a preparation method of spherical ultrafine copper powder, which uses copper salt as the starting material, adds a dispersant, first pre-reduces with glucose, and then reduces with hydrazine hydrate to obtain spherical copper with a particle size of 1-5 μm Powder, this method brings in certain impurities due to the addition of dispersant, and also has the disadvantages of uneconomical starting materials and coarse particle size

Chinese patent 02117719.8 discloses a process for preparing micron-sized ultra-fine copper powder by chemical method using scrap copper as raw material. It uses scrap copper as the starting material, dissolves in ammonia water and acid under the action of air, and then blows air into it to precipitate Separating CuOH and cuproammonia solution, and then acidifying CuOH to obtain copper powder, the direct copper recovery rate of this method is not high, and it is difficult to apply to industrial production

[0006] To sum up, the method of the above-mentioned ultrafine copper powder in the prior art still has the problem of uneconomical raw materials, appearance quality and oxidation resistance need to be improved, the particle size has not yet reached below 1.0 μm, and the problem that impurities are easily mixed in the production process cannot be adapted. In the production of zinc hydrometallurgy copper slag as raw material, further exploration is needed

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