Generating elemental sulfur galena conversion of ammonium carbonate solution, most of the sulfur is oxidized to elemental sulfur, a small partial oxidation of S x 0 y 2- into solution. Increasing the reaction temperature and prolonging the reaction time will increase the amount of S x 0 y 2- , the galena in the ammonium carbonate solution, the reaction temperature is 60 ° C, the time is 6 h, about 38% of the sulfur enters as an oxide. Solution; if the reaction temperature is 50 ° C, the time is 1 h, only 17% of the sulfur enters the solution. For example, in an autoclave, the reaction temperature is 90 ° C for 1 h, sulfur is completely oxidized into the solution, and no elemental sulfur is produced. The following table shows the influence of temperature and time on the formation of elemental sulfur during the conversion of galena.
Effect of conversion temperature and time on the formation of elemental sulfur | ||||
Temperature / °C | Time / h | Lead conversion rate /% | S 0 generation rate /% | S x 0 y 2- generation rate /% |
60 | 6 | 92.58 | 61.25 | 38.75 |
60 | 5 | 90.83 | 73.69 | 26.31 |
60 | 4 | 92.38 | 76.86 | 23.14 |
55 | 5 | 90.17 | 80.02 | 19.98 |
50 | 6 | 92.03 | 82.81 | 17.19 |
50 | 4 | 91.03 | 83.58 | 16.42 |
Insoluble anode electrolysis
After conversion galena, in acid solution to dissolve the silicon, lead powder and then replaced with purified solution and finally the insoluble anodic electrolysis, lead metal preparation. Insoluble anodic electrolysis of lead, if no measures are taken during electrolysis, an equivalent amount of PbO 2 is formed at the anode. In order to reduce or prevent the formation of Pb0 2 at the anode, a small amount of H 3 PO 4 was added to the electrolyte before the electrolysis, in an amount of 1%. The table below shows the results of insoluble anodic electrolysis of lead.
Lead insoluble anode electrolysis results | ||||||
Current density / ( A · m -2 ) | Time / h | Pb 0 yield / g | PbO 2 yield / g | PbO 2 yield /% | Current efficiency /% | Tons of lead power consumption / ( kW · h ) |
110 | 6 | 14.5 | 0.11 | 0.8 | 100 | 549 |
142 | 8 | 24.1 | 0.21 | 0.9 | 97.4 | 584 |
200 | 8 | twenty three | 0.2 | 0.86 | 98.8 | 675 |
200 | 287 | 1647.5 | 17.2 | 1.04 | 94.5 | 688 |
The lead chemical product galena is converted by carbonation, dissolved in dilute nitric acid, dissolved and filtered, and the filtrate is added with quantitative sulfuric acid to precipitate lead sulfate. At the same time, the nitric acid is regenerated and can be returned to use; the precipitated lead sulfate passes through A series of conventional reactions, have been tested to produce 10 kinds of lead chemical products, product quality has reached the national standard first-class products, there is a larger market. The 10 kinds of chemical products: tribasic lead sulfate, dibasic lead phosphate, lead stearate, red lead, yellow lead, lead nitrate, boric acid, lead acetate, basic lead carbonate and lead chrome yellow, etc. .
Providing fully custom Folding Carton with difference color, size, and structure. They are also many colors for your choose. We can do difference color as client requirements. And make Silk Screen Printing as the graphic of client. Drawing for customer's structure and create artwork for client's graphic, high level quality control to keep timing.
Folding Carton
Folding Carton,Stacking Gift Boxes,White Cardboard Gift Boxes,Folding Boxes
DongGuan LongTen package Products Co. Ltd , https://www.longtenpack.com