In order to increase the phosphorus content in phosphorus copper, improve the production environment, and improve product quality, a new process for the production of copper was developed according to the existing domestic production conditions: using a special graphite and phosphorus cylinder
The red phosphorus powder was added to the copper liquid several times, and a series of parameters were determined through experiments. The new process achieves the purpose of clean production
At present, the more advanced phosphor bronze production methods in foreign countries include "inert gas blowing method" and "mixed sealing method". Both processes are relatively complicated, and the investment and cost are high, but the product quality is good (
The amount of phosphorus can reach 14%~14.7%, and the absorption rate of phosphorus is 90%~97%). Domestically, the "blending method" and "semi-closed mixing method" are used. They all place the red phosphorus in the citrus pot at one time, inject
When liquid or heated, the gaseous phosphorus is produced in a large amount and the pressure is high, and a part of the gaseous phosphorus that is too late to combine with copper escapes and is oxidized into PZO. , the loss of phosphorus is large, and the environmental pollution is heavy. The production scale of these two methods is small, the product quality is poor, the phosphorus content is 9%~13%, and the phosphorus absorption rate is 65%~80%. In order to seek a cleaning process suitable for my country's technical and economic conditions, a new process of directly adding red phosphorus to copper liquid in fractions has been developed', b. Phosphorus method "Phosphorus copper production cleaning process
Process method of phosphor bronze capillary
Red phosphorus and electrolytic copper are weighed according to the weight ratio of 1:6, the copper block is put into the graphite tong pot in the blast coke furnace, compacted with smm ash, heated and melted; Phosphorus cylinder
Seal the mouth of the cylinder with copper foil and copper wire; stop heating when the copper block melts and heats up to 1150°C, open the phosphorus hole in the middle of the furnace cover, insert the phosphorus cylinder vertically into the copper liquid, and then seal the cylinder with phosphorus
The foil is melted, the red phosphorus is heated, and the gaseous phosphorus is continuously produced and reacted with the copper liquid; after a few minutes, the reaction is completed, and the rate of slow extraction and combination is equal. In addition, gaseous phosphorus has a certain pressure, usually
When the gap of the phosphorus feeding cylinder enters the melt, the melt will generate turbulent flow, and the collision and mixing between gaseous phosphorus and liquid copper particles will promote the chemical reaction.
Effect of Temperature on Compounding Reaction
Phosphorus reacts with copper to release heat, and the phase change of red phosphorus absorbs heat. According to the copper-phosphorus phase diagram, the crystallization point of the melt changes with the change of phosphorus content in the melt. This test uses several
In the phosphorus method, the crystallization point of the phosphorus solution is different every time. In order to determine the effect of melt temperature on the phosphorus content and phosphorus absorption rate of the alloy, under the above conditions, 6 identical phosphorus adding cylinders were used to select three groups of temperatures within a certain temperature range above the node to carry out the dosing test respectively. Tests have shown that the optimum temperature for phosphorus injection should be selected and controlled within the range of 10-150`C above the crystallization point of the alloy melt. Therefore, it can be confirmed that the reaction of temperature to the compound directly affects the cleaning effect of the phosphor bronze capillary.
Conclusions on Phosphor Bronze Capillary Cleaning Process
The very small amount of PZOS gas produced in the compounding reaction can be discharged with the flue gas of the furnace in an organized way, and will not pollute the operating environment and the atmospheric environment.
In this experiment, a high-temperature photometer was used to measure the temperature of the melt, and the error was large, mainly due to the influence of the oxide film on the surface of the melt, copper vapor, and PZOS gas. In production, thermoelectric high temperature measurement can be used instead
Warm, fast and accurate. This process is suitable for large-scale mechanized production.