Superfine cupper powder and preparation method thereof

A technology of ultra-fine copper powder and copper powder, applied in the direction of improving process efficiency, can solve the problems of easy mixing of impurities, low direct copper yield, coarse particle size, etc., to avoid the introduction of impurities, high recovery yield, Avoid the effect of oxidation

Active Publication Date: 2010-11-24
ZHUZHOU SMELTER GRP
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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 du

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[0036] Example 1

[0037] An ultrafine copper powder and its preparation method, the process flow is as follows figure 1 As shown, it uses hydrometallurgical zinc copper slag as raw material. It soaks 1000g copper slag containing 45.38% copper in a 10g / L sulfuric acid solution for 10 minutes, filtered and dried, and roasted at 400°C for 6 hours. After roasting, the copper The slag was leached under the condition of controlling the end point acidity of 20g / L to obtain 310g leaching slag. The leaching slag contained 0.72% copper and the copper leaching rate was 99.08%. Take the copper sulfate leaching solution and purify it with sodium hydroxide, adjust the pH value to 3.5, take a part of the purified solution and prepare about 1000 mL of copper sulfate solution with copper content of 0.3 mol / L for later use.

[0038] Under constant stirring, add sodium hydroxide to 1000mL of 0.3mol / L copper sulfate solution to adjust the pH to 11, then add 14.8g of glucose powder, control the react...

Example Embodiment

[0041] Example 2

[0042] An ultrafine copper powder and its preparation method, the process flow is as follows figure 1 As shown, it uses hydrometallurgical zinc and copper slag as raw material. It soaks 1000g copper slag containing 45.38% copper in a 10g / L sulfuric acid solution for 20 minutes, filtered and dried, and roasted at 500℃ for 5h. After roasting, the copper The slag is leached under the condition of controlling the end point acidity of 15g / L to obtain 308g leaching slag, the slag contains 0.65% of copper, and the copper leaching rate is 99.27%. Take the leaching solution and purify it with sodium hydroxide, adjust the pH to 3.5, take a part of the purified solution to prepare about 1000 mL of copper sulfate solution with copper content of 0.3 mol / L for later use.

[0043] Under constant stirring, add sodium hydroxide to 1000mL of 0.3mol / L copper sulfate solution to adjust the pH to 12, then add 14.8g of glucose powder, control the reaction temperature to 70°C, and the...

Example Embodiment

[0046] Example 3

[0047] An ultrafine copper powder and its preparation method, the process flow is as follows figure 1 As shown, it uses hydrometallurgical zinc-copper slag as raw material. It soaks 1000g copper slag containing 45.38% copper in 8g / L sulfuric acid solution for 30 minutes, filtered and dried, and roasted at 550°C for 4.5h. After roasting The copper slag was leached under the condition of controlling the end point acidity of 15g / L to obtain 311g of leaching slag. The slag contained 0.62% copper and the copper leaching rate was 99.36%. Take the leaching solution and purify it with sodium hydroxide, adjust the pH value to 4.0, take a part of the purified solution to prepare about 1000 mL of copper sulfate solution with copper content of 0.5 mol / L for later use.

[0048] Under constant stirring, add sodium hydroxide to 1000 mL of 0.5 mol / L copper sulfate solution to adjust the pH to 13, then add 24.8 g of glucose powder, control the reaction temperature to 80° C. and ...

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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...

Claims

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Application Information

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IPC IPC(8): B22F9/24C22B1/02C22B3/08
CPCY02P10/20
Inventor 刘一宁林文军窦传龙赵为上廖贻鹏周萍
Owner ZHUZHOU SMELTER GRP
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