A mass-producible degassing process for electrolytic chromium sheets

Abstract

The invention belongs to the field of high-temperature smelting of nonferrous metal and provides a novel hydrogen reduction degassing method of an electrolytic chrome sheet. Water is generated through an oxygen reaction of hydrogen and the chrome sheet at the high temperature, and the deoxidizing effect is achieved. The technique comprises the specific steps that a communicating pipe (1) and a base (2) are connected through threads in a welded mode, after it is detected that no gas is leaked, and the base (2) is put in the middle of a furnace bottom cover; then the communicating pipe (1) is connected to the position of a hydrogen outlet in the furnace bottom, and the effect that pipelines are well connected without gas leakage is guaranteed; then a hard sealing ring (4) is put on the base (1), the effect that positions of the periphery of the hard sealing ring (4) are even is guaranteed, and then a crucible (3) is put on the hard sealing ring (4); 3-8 crucibles are installed according to the steps, and finally, an end cover (5) is put on the crucible on the uppermost layer; and vacuumizing is conducted till the pressure is 10 Pa or lower at the room temperature after charging, hydrogen with the purity being 99.9% or higher is introduced, the hydrogen pressure is kept to be positive pressure, that is, -0.1-1.5 Mpa, then heating is slowly conducted till the temperature reaches 1400-1500 DEG C, heat preservation is conducted for 5-20 hrs, then cooling is conducted till the temperature is 50 DEG C or lower under the condition that hydrogen continues to be introduced, and discharging is conducted. Therefore, the technique which can achieve mass product and is used for producing the high-purity low-oxygen electrolytic chrome sheet through hydrogen reduction is achieved.

Description

technical field [0001] The invention belongs to the field of high-temperature smelting of nonferrous metals, in particular to a production process for degassing electrolytic chromium sheets that can be mass-produced. It solves the problem that there is no mass-produced high-purity chromium sheet in China. Background technique [0002] High-purity metallic chromium refers to the chromium whose main component is more than 99.95% chromium and has low impurity content, especially low content of oxygen, carbon, nitrogen and sulfur. Among them, oxygen is less than 0.04%, carbon is less than 0.025%, nitrogen is less than 0.003%, and S is less than 0.002%. High-purity metal chromium is mainly used as a superalloy additive to produce aircraft turbine blades, electrical contacts, semiconductors, chip sputtering targets and other fields. [0003] Among them, high-end semiconductors, chips, precision electronic products, automotive piston rings, and chromium targets coated with optica...

AI Technical Summary

Problems solved by technology

[0010] There are no other patents related to degassing of chrome sheets in China

Images