A method for directly preparing copper oxide from copper oxide ore to fully and effectively utilize national copper oxide ore resources. The content and method of the present invention include acid-soluble copper leaching and countercurrent water washing. Solution purification of precipitated copper hydroxide, copper hydroxide dehydration pure copper oxide, four steps, as follows:
1, acid-soluble copper: 10%-15% sulfuric acid aqueous solution as a solvent at 80-90 ° C temperature The copper oxide ore having a particle size of 60-80 mesh is leached, the aqueous sulfuric acid solution: copper ore = 2:1, wherein the copper ore powder: sulfuric acid (98%) = 1:0.14, the leaching time is 1.5-2 hours, and The rotation speed of 50-70 rpm is continuously stirred. The copper, iron and most of the acid-soluble ore are present in the solution.
2. Countercurrent Washing: Washing the slag against the acid-impregnated copper in reverse. When the first batch of slag comes out, put it into the first washing tank, wash it with water for the first time, and after washing, wash the water. Incorporating into the acid-soluble copper sediment, the slag is placed in the second cleaning tank; the second water washing is performed with water. After sinking, the washing liquid is placed in the first washing tank (for the first washing of the next batch of slag), and the slag is placed in the third washing tank; the third washing with water, after sinking, The washing liquid is placed in the second washing tank (for the second washing of the next batch of slag), and the slag is placed in the fourth washing tank; the fourth washing is carried out with water, and the washing liquid is put into the first In the three washing tanks (for the third washing of the next batch of slag), the slag should not be discarded after four times of washing. The foregoing is the initial washing of the first batch of slag. Both are washed with water, and after the water washing process, the fourth washing of the slag is carried out in the fourth washing tank with water (the slag has been washed three times before); after the clarification, the slag is discarded, and then Put the washing liquid into the third washing tank to wash the third slag (the slag has been washed twice before); after sinking, put the washing liquid into the second washing tank to wash the second slag (this slag) The front side has been washed once); after sinking, put the washing liquid into the first cleaning tank to wash the first slag (the front slag has not been washed before); after sinking, the water washing liquid is incorporated into the acid-soluble immersion copper. In the supernatant, the slag is placed in the next washing tank for a second washing. By analogy, each batch of slag is washed four times, and each time the slag is washed, it is stirred for 15-20 minutes, and the mixture is precipitated. By washing, the amount of copper sulfate remaining in the slag is less and less, and the content of copper sulfate in the washing liquid is getting higher and higher, thereby sufficiently separating and removing the copper sulfate solution from the slag.
3, solution purification precipitation of copper hydroxide: in the copper sulfate solution according to the ratio of copper sulfate: copper oxide: hydrogen peroxide = 1:0.01:0.005 added copper oxide powder and H2O2, the pH of the solution is 3.5-4.2, boil the solution, sinking Filtration, and then continuously stirring the supernatant and gradually adding 8-12% sodium hydroxide solution to convert the copper sulfate in the solution into copper hydroxide precipitate. The main reaction is: adding the amount of alkali solution (NaOH) to the solution PH=10-11 is the main.
4. Dehydration of copper hydroxide to pure copper oxide: The generated copper hydroxide and the solution are heated at 80-90 ° C for 20-30 minutes, and the dark brown copper oxide is precipitated. The main reaction is as follows: washing with decantation water The copper oxide is precipitated, washed until the SO4 and OH- are not contained in the washing liquid, and dried at 300 ° C – 500 ° C for 2-4 hours, and ground to 100 mesh.