- The dry copper powder is mixed with copper oxide after removing impurities, and sent to a calciner to be heated to 800 to 900 ° C to be calcined to form cuprous oxide. After taking out, the mechanical impurities were removed by a magnet and pulverized to 325 mesh to obtain a finished cuprous oxide. If copper sulphate is used as the raw material, the copper in the copper sulphate is first reduced with iron, and the subsequent reaction step is the same as the method using copper powder as the raw material.
2. The glucose reduction method mixes the copper sulfate solution with glucose and then reacts with sodium hydroxide solution to form cuprous oxide, which is filtered, rinsed, dried and pulverized to obtain a cuprous oxide product.
3. Electrolytic method in the electrolytic housing with PVC casing lined with iron casing, casting copper plate as anode, copper plate as cathode, potassium chromate as increasing agent, salt solution as electrolyte, containing sodium chloride as 290~ Electrolysis is carried out under conditions of 310 g/L, potassium chromate of 0.3 to 0.5 g/L, temperature of 70 to 90 ° C, pH of 8 to 12, and current density of 1500 A/m 2 to form cuprous oxide, which is separated by precipitation, rinsed, and filtered. Drying produces copper oxide.
4. 肼 reduction method. 3 to 5 mL of a 20% aqueous solution of ruthenium was poured into a 50 mL aqueous solution of a high concentration of copper acetate to reduce the divalent copper ions. The solution initially turned green and produced nitrogen. After standing for a while, yellow to orange-colored cuprous oxide precipitated. The precipitate was washed with water, ethanol and diethyl ether. Since the excess bismuth can further reduce the cuprous oxide to metallic copper, the amount of cerium is not excessive.
5. Glucose reduction synthesis method of film solution. 50 g of copper sulfate pentahydrate and 75 g of sodium potassium tartrate were separately dissolved in 200 mL of cold water, and the solution was mixed while the solution was cooled to room temperature. Further, 75 g of sodium hydroxide was dissolved in 200 mL of water to prepare an alkali solution. While stirring the mixed solution, the alkali solution was slowly added, and the temperature of the solution was carefully maintained without causing the temperature of the solution to rise, and the solution turned dark blue. The divalent copper salt solution was heated and boiled, and a 10% glucose solution was added until the blue color disappeared, and red cuprous oxide precipitated. Then, it was placed in 1 L of cold water, and after standing for about 15 minutes, the supernatant liquid was discarded; the mixture was stirred with water, decanted, and filtered with a Buchner funnel; the precipitate was washed twice with 15 mL of water, followed by ethanol. Three times, and finally dried in an air bath.
6. Direct oxidation of metallic copper. The copper metal was suspended in a vertical tubular electric furnace with a platinum wire, and heated at 1000 ° C for 24 hours in a nitrogen atmosphere containing 1% by volume of oxygen to obtain cuprous oxide. Alternatively, the stoichiometric mixture of metallic copper and copper oxide is sealed in a vacuum tube and heated at 1000 ° C for 5 hours to obtain cuprous oxide.
7. Preparation method Dissolve copper sulfate in hot water, add theoretical amount of medicinal glucose to stir and dissolve, filter out insoluble matter, obtain completely transparent filtrate, add transparent 20% sodium hydroxide solution, and rapidly heat to about 35 °C (Do not exceed 40 °C) to carry out the reduction reaction, the reaction formula is as follows: after the end of the reaction (the upper layer solution is light blue or with a small gray-green suspension), stand still to complete the precipitation, separate the supernatant, 60-70 The hot water of °C was washed and precipitated to be free of SO24, then washed with absolute ethanol solution, dried, stirred occasionally, and dried at room temperature. A mixture of 10 parts of copper powder and 12.5 parts of copper oxide was heated under vacuum at 100 ° C for 5 h to obtain cuprous oxide. The chemical reaction is as follows: after cooling, mechanical impurities are removed by a magnet, pulverized, and then heated a second time under vacuum.