Method and process for smelting chromium carbide with high ratio precision
Release time:
2021-11-22 13:49
Source:
The invention relates to the technical field of the production method of alloy products, in particular a production method of chromium carbide. Chromium carbide is a material used in the metallurgical and chemical industries. Its main components are carbon and chromium, as well as a small amount of iron, silicon, aluminum and other impurities. The current production method is to synthesize chromium carbide in a vacuum resistance furnace or induction furnace with chromium oxide as the main raw material and carbon as the reducing agent. The carbonization rate of this method is above 99%. However, when this method is used in practice, it is difficult to effectively screen the initial raw materials, which will affect the ratio accuracy of the raw materials. At the same time, after the material is dried, more metal powder will be attached to the surface, which has a certain toxicity and will cause certain damage to the user's body.
Accordingly, those skilled in the art have provided a method for producing chromium carbide, which aims to solve the problems raised in the above-mentioned background art. A production method of chromium carbide, which is characterized in that chromium oxide is used as the main raw material, carbon is used as the reducing agent, the ratio of chromium oxide to carbon is 900g -1000g, 300g -310g, and the main process is: screening The mixed material briquette is dried and carbonized and weighed. First, 930g of metal chromium powder and 305g of graphite powder are screened with a 0.9mm vibrating screen, then the sieved metal chromium powder and graphite powder are mixed with a vertical mixer, and then pressed with a metal scrap briquetting machine; the pressed material is dried with a vacuum resistance furnace, heated to 1660 temperature, and then kept warm for 1.5 hours; then the dried material is collected with a bag filter; after collection, the block material is carbonized, and then the finished product is crushed with a crusher for 5-8 minutes to obtain chromium carbide powder, which is then screened with a vibrating screen for 3-6 minutes, the aperture of the sieve is 0.9mm, and the sieved chromium carbide powder is weighed with a scale, and the chromium carbide powder is effectively packaged with an automatic dispenser. The vibration frequency of the vibrating screen is 1150 times/min, the mesh is 10~500 mesh, and the screening voltage is 220v/50w. The dust removal method of the bag filter is electric vibration beating, and the dust removal method is flat bag filtration, in which the bag material is polyester fiber non-woven fabric, the filtering accuracy of the bag filter is 20m, the crusher has 15 rotating knives and 4 fixed knives, the rotating speed of the knife shaft is 520r/min, and the size of the storage hopper is 250*300. The weighing range of the scale is 0.4~300kg, and the weighing area of the scale is 45~60cm. The error value of the scale is 50~200g, the scale value is 20g, the packaging speed of the automatic packaging machine is 10~25 times/minute, the packaging range is 5~50g, and the packaging accuracy is 1g. The size of the metal chip briquetting machine is 110 *(70-120), and the compaction density is 5200-5400. The working pressure of the metal chip briquetting machine is 23mpa.
Compared with the prior art, the present invention has the following beneficial effects: by adding a screening process, raw materials can be effectively screened, the ratio accuracy of metal chromium powder and graphite powder can be improved, and the error caused by the ratio can be reduced; at the same time, by adding aggregate The process can effectively collect the powder attached to the surface of the block raw material, on the one hand, reduce the damage of the powder to the human body, on the other hand, reduce the loss of the production cost of chromium carbide.
Chromium carbide
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