Desulfurization recovery method of slag iron of blowing-process desulfurizing slag

Abstract

The invention discloses a desulfurization recovery method of slag iron of blowing-process desulfurizing slag, which comprises the following steps: 1) transporting slag iron obtained from blowing-process desulfurizing slag by magnetic separation to a converter slag field; 2) adding the slag iron to the middle of a slag ladle of the converter for use, wherein 20kg of slag iron is added to every ton of liquid converter steel slag, the size is less than 0.5*0.5m (length*width), the thickness is less than 0.2m, the slag iron is kept dry, and the maximal amount is not greater than 500kg for each ladle; 3) suspending the converter slag ladle with the blowing-process desulfurizing slag slag iron to a converter slag vehicle, and receiving the converter turndown slag by a converter slag pit; 4) pouring the turndown slag into the slag ladle by the converter according to the conventional slag discharge technique; 5) transporting the slag ladle filled with the converter turndown slag to the converter slag field, and standing for 20-40 minutes; 6) treating according to a hot application or hot braising conventional treatment technique for converter carbon steel slag; and 7) after the hot application or hot braising technique is finished, carrying out magnetic separation to recover the slag iron in the steel slag, which is directly used for steel making.

Description

technical field [0001] The invention relates to a desulfurization recovery method of jet desulfurization slag iron. Background technique [0002] Hot metal desulfurization process is the operation process with the highest efficiency and the lowest desulfurization cost in the metallurgical process, which has brought huge benefits to the iron and steel industry. The core of the problem is the recovery of metallic iron in the desulfurization slag. [0003] At present, hot metal injection desulfurization is the preferred desulfurization process for smelting ultra-low sulfur steel. This process is mainly desulfurization by spraying passivated magnesium powder and passivated lime powder. This desulfurization mode causes high magnesium oxide content in the slag, high viscosity of the slag, and a large amount of iron in the slag removal process, resulting in injection desulfurization. The slag contains high iron content, and the CO, H released during the disposal process 2 S, SO ...

AI Technical Summary

Problems solved by technology

Due to the high viscosity of sprayed desulfurization slag, the separation of metallic iron and desulfurization slag is difficult, and the slag iron inevitably contains desulfurization slag, which is directly used for steelmaking. In the oxidizing atmosphere of steelmaking, MgS in the slag will produce MgS The reaction of +O→MgO+S increases the sulfur content of molten steel, which limits the recycling space of desulfurized slag and iron in steelmaking plants

[0004] Literature Search (1) Niu Xiyun, Liu Shuhai Practice of Injection Granular Magnesium Desulfurization Technology Continuous Casting 2007 (5) Zhang Wanqing Research and Application of Hot Metal Composite Injection Desulfurization Technology 2009 (6) (3) Zhuo Jun Li Pingfan Ge Wensun Pan Steel-magnesium composite injection desulfurization and slag adjustment process practice Sichuan Metallurgy - 2009 (3) It can be seen that there is no systematic and effective solution to the process of injection desulfurization slag iron, resulting in many domestic steel mills desulfurization slag iron has not been Effective recycling becomes a tasteless idle resource