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several preparation methods of cuprous oxide


The main preparation methods of cuprous oxide are as follows:

Dry process:  

Copper powder mixed with copper oxide, then feed into calcined furnace after removing impurities heating to 800 ~ 900 ℃ to get cuprous oxide, the mechanical impurities were absorbed by magnet, and then crushed to 325 mesh to obtain cuprous oxide products.If copper sulfate is used as the raw material, the copper in copper sulfate is first reduced by iron, and the subsequent reaction steps are the same as the method using copper powder as the raw material. 

Glucose reduction method:

Copper sulfate solution mixed with glucose and then sodium hydroxide solution was added for reaction to generate cuprous oxide, which was filtered, rinsed, dried and crushed to produce cuprous oxide products.

Electrolytic method in iron:

Electrolytic cell, make A shell lining PVC with anode casting copper, copper plate as cathode, using potassium chromate as additives, salt solution as the electrolyte, which in 290 ~ 310 g/L sodium chloride, potassium chromate is 0.3 ~ 0.5 g/L, the temperature of 70 ~ 90 ℃, pH8 ~ 12, the current density of 1500 A/m2 under the condition of electrolysis, generate the cuprous oxide, after precipitation separation, rinse, filtration, drying with cuprous oxide.

Hydrazine reduction method:

3 ~ 5mL 20% hydrazine solution was poured into 50mL copper acetate solution with high concentration to reduce divalent copper ions.The solution initially turns green and produces nitrogen, which is deposited over time to form a yellowish to orange-yellow copper oxide.Precipitation water, ethanol and ether washing.Because excessive hydrazine can further reduce cuprous oxide to copper, the amount of hydrazine should not be excessive.

Glucose reduction synthesis of film solution:

50g copper pentahydrate sulfate and 75g sodium potassium tartrate were dissolved in 200mL cold water, respectively, and the two were mixed at room temperature.In addition, 75g sodium hydroxide was dissolved in 200mL water to prepare an alkali solution.In the case of mixing the solution, slowly add the base solution, carefully keeping the temperature of the solution so that the temperature of the solution does not rise and the solution turns dark blue.Bring the bivalent copper salt solution to a boil and add 10% glucose solution until the blue color disappears and the red cuprous oxide is precipitated.Then put it in 1L of cold water and let it sit for about 15min. Then discard the upper clarifying liquid.Then add water to stir, pour out, filter with brinell funnel;The precipitates were washed twice with 15mL of water, then three times with ethanol, and finally dried in an air bath.

Direct oxidation of copper:

With a platinum wire copper hung in a vertical tube furnace, in containing 1% (volume fraction) of oxygen in nitrogen atmosphere, heating at 1000 ℃ for 24 h to cuprous oxide.Or the metal copper and copper oxide chemical mixture calculation closed in vacuum tubes, in the 1000 ℃ heating 5 h makes the reaction and cuprous oxide.