Horizontal movement - fixed bed magnetization reduction roasting process

Abstract

The invention relates to a horizontal moving-fixed bed type magnetization reduction roasting process, which comprises the following steps: (1) briquetting and pelletizing fine ore after sieving to obtain raw materials; (2) moving raw materials through horizontal moving-fixing The distribution machine of the ore bin in the bed type magnetization reduction roasting device distributes it to the horizontal moving bed, so that the lower layer is ore and the upper layer is balls; (3) The ore and balls on the horizontal moving bed are magnetized reduction roasted with gas or coal powder ;After the ore is fully reduced, the magnetization roasting process is completed; (4) The ore and balls roasted in step (3) are discharged by the scraper at the end of the bed surface, and discharged into the water cooling device. After cooling by water, the unloading machine moves out The ore is sent to the grinding and sorting process. The preheating, heating and reduction processes of powder ore magnetization reduction roasting in the present invention are all completed on the horizontal moving-fixed bed roasting device, which not only simplifies the production process, reduces investment costs, but also avoids the process similar to rotary kilns, etc. The ring formation problem of roasted fine ore.

Description

technical field [0001] The invention relates to the field of magnetization roasting of small particle ores, in particular to a horizontal moving-fixed bed magnetization reduction roasting process. Background technique [0002] With the rapid development of iron and steel enterprises, the contradiction of insufficient resources is becoming more and more serious. In order to reduce production costs, domestic enterprises have to develop and utilize refractory ores. Production practice and a large number of scientific research results have proved that roasting magnetic separation is the most effective way to process refractory iron oxide ore. At present, the iron ore magnetization reduction roasting processes used in industrial production mainly include: shaft furnace, rotary kiln, fluidized fluidized bed furnace, tunnel kiln, etc. Although the purpose of magnetization roasting can be achieved to a certain extent, there are unsuitable ore particle sizes and easy sticking. There...

AI Technical Summary

Problems solved by technology

At present, the iron ore magnetization reduction roasting processes used in industrial production mainly include: shaft furnace, rotary kiln, fluidized fluidized bed furnace, tunnel kiln, etc. Although the purpose of magnetization roasting can be achieved to a certain extent, there are unsuitable ore particle sizes and easy sticking. There are many problems such as low kiln and roasting efficiency. For example, the magnetization reduction roasting of Anshan type shaft furnace can only use lump ore as the main raw material, and the required raw material particle size is 15-75mm. However, due to poor air permeability, agglomeration in the smelting furnace, and poor reduction effect, it is impossible to use shaft furnace magnetization roasting

At present, the industrial production of magnetization reduction roasting of powder ore is carried out by the rotary kiln process. Due to the difficulty in sealing the head and tail of the rotary kiln and the serious ring formation in the high temperature area of ​​the kiln, the productivity of the rotary kiln is low and the roasting efficiency is low, which restricts the rotary kiln. Further Development of Kiln Magnetization Reduction Roasting Technology

The fluidized fluidized furnace is a vertical furnace with a circular cross section, which can roast fine ore, but there are also problems such as unsmooth ore flow, low production efficiency, and difficult control.

It can be seen that there is currently no magnetization roasting process that can stably and efficiently process fine ore