Iron ore tunnel kiln magnetizing roasting layering material distributing reduction method

Abstract

The invention discloses an iron ore tunnel kiln magnetizing roasting layering material distributing reduction method. Iron ore is divided into different granularity degrees according to the granularity range; the reduction coal is flatly laid in the bottom of a tunnel kiln car according to the proportion that the reduction coal accounts for 4-6% of the total weight of iron ore; the iron ore of various granularity degrees is laid at the upper portion of the reduction coal of the tunnel kiln car, and the granularity range of each layer of iron ore is gradually increased from the bottom layer to the top layer in a layer-by-layer manner; facing materials are flatly laid at the upper portion of iron ore of various granularity degrees of the tunnel kiln car; the tunnel kiln car loaded with materials is pushed into a tunnel kiln for magnetizing roasting; and after magnetizing roasting is finished, the tunnel kiln car loaded with the materials is pushed out of the tunnel kiln. According to the method, over reduction of iron ore can be effectively prevented, the control means of iron ore magnetizing roasting is improved, and the surplus carbon recycling and utilizing cost is low. In addition, the mixing technology of iron ore and a reducing agent before magnetizing roasting of the iron ore tunnel kiln is reduced or eliminated, and the production cost of the roasted ore is reduced.

Description

technical field [0001] The invention relates to an iron ore magnetization roasting process, in particular to a layered cloth reduction method for iron ore tunnel kiln magnetization roasting. Background technique [0002] In the iron ore mining process, iron ores with different particle sizes will be produced. These iron ores with different particle sizes are magnetized and roasted in the tunnel kiln. The commonly used technology is: the iron ore is first classified into particle size before magnetization roasting, and the iron ore in each particle size range and the reducing agent of the corresponding particle size are batched and mixed according to the ratio of 2 to 3%, and then the small particle size is taken The method of laying iron ore on the lower layer of the kiln car and laying large-size iron ore on the upper layer of the kiln car is used for distribution. The main problems of this iron ore tunnel kiln distribution method are: (1) Magnetized roasting in the iron or...

AI Technical Summary

Problems solved by technology

[0002] In the iron ore mining process, iron ores with different particle sizes will be produced. These iron ores with different particle sizes are magnetized and roasted in the tunnel kiln. The commonly used technology is: the iron ore is first classified into particle size before magnetization roasting, and the iron ore in each particle size range and the reducing agent of the corresponding particle size are batched and mixed according to the ratio of 2 to 3%, and then the small particle size is taken The method of laying iron ore on the lower layer of the kiln car and laying large-size iron ore on the upper layer of the kiln car is used for distribution. The main problems of this iron ore tunnel kiln distribution method are: (1) Magnetized roasting in the iron ore tunnel kiln In the process, the fixed carbon in the reduced coal is used for reduction, because the carbon gasification temperature in the reduced coal is higher, and the reduction of iron ore requires a higher temperature; (2) Iron ore needs to be mixed with a reducing agent before magnetization roasting, and the The technological process is complicated, and the production cost per unit product is high; (3) After the iron ore is magnetized and roasted, the excess carbon with low content is evenly distributed in the roasted ore. The existence of excess carbon in the roasted ore will not only affect the subsequent grinding of the roasted ore The quality of ore and magnetic separation, and the cost of excess carbon recycling is relatively high