Method for preparing copper oxide by dissolving copper

Abstract

The invention relates to a method for preparing copper oxide by dissolving copper, which comprises the following steps that: copper, ammonia water and powdery ammonium bicarbonate or ammonium carbonate or the mixture of the ammonium bicarbonate and the ammonium carbonate are placed into a reaction container, the temperature of a system is controlled between 30 DEG C and 55 DEG C, the pressure intensity of the system is between 1atm and 2atm, and air or oxygen gas is introduced when the operation of stirring is continuously carried out for reacting; meanwhile, a circulating device is arranged for conveying ammonia gas and carbon dioxide which are volatilized from the reaction container into the reaction container anew for participating in the reaction after the ammonia gas and the carbon dioxide are recycled; and when the temperature is increased and the pressure intensity of the system is not changed any longer, the reaction is finished, the undissolved copper in the reaction system is removed, the operation of filtering is carried out, a filter cake is remained, the operation of washing is carried out and the operation of sintering is carried out at the temperature of 500 to 700 DEG C so as to obtain copper oxide of which the purity is greater than or equal to 99 percent. According to the method disclosed by the invention, raw materials are easy to obtain, the price is low, the requirement to equipment is not high, no pollution to the environment exists, the dissolving rate of the copper is high, and the production cost of the copper oxide is greatly lowered.

Description

technical field [0001] The invention relates to a method for preparing copper oxide, in particular to a method for preparing copper oxide by dissolving copper. Background technique [0002] According to reports, the world's annual copper consumption has reached tens of millions of tons, and my country's copper consumption has reached nearly 5 million tons. This rate is still growing, so now there is a huge amount of scrapped copper materials every year. People often return the recovered copper to the furnace for melting and reprocessing, but scrap copper contains many impurities, which are difficult to separate during the copper melting process, and the remelting temperature is high and consumes a lot of energy. At present, copper-dissolving tanks are also used in the industry to dissolve copper, that is, to dissolve copper by using the oxidation of sulfuric acid and the heat released. This method also has some defects: it requires high equipment and must be corrosion-resista...

AI Technical Summary

Problems solved by technology

[0002] According to reports, the world’s annual copper consumption has reached tens of millions of tons, and my country’s copper consumption has reached nearly 5 million tons, and this rate is still increasing Therefore, there is a huge amount of scrapped copper materials every year. People often return the recovered copper to the furnace for melting and remaking. However, scrap copper contains many impurities, which are difficult to separate during the copper melting process, and the remelting temperature is high. , high energy consumption

At present, copper-dissolving tanks are also used in the industry to dissolve copper, that is, to dissolve copper by using the oxidation of sulfuric acid and the heat released. This method also has some defects: it requires high equipment and must be corrosion-resistant; during the dissolution process Release a large amount of harmful gases such as SO 2 ; the generated product is viscous and needs a large amount of water to dilute, which increases the process flow and increases the production cost

The disadvantage of this process is that liquid ammonia or gaseous ammonia must be continuously added, and the 1.2 atm must be maintained, which is demanding on the process. At the same time, the reaction temperature is 50°C~70°C. At this time, the decomposition reaction of ammonia bicarbonate has occurred NH 4 HCO 3 → NH 3 + H 2 O + CO 2 , bicarbonate at 60°C Ammonia has been completely decomposed, and the reaction mentioned in the patent does not occur