Powder refractory iron oxide ore cold briquetting agglomeration, shaft furnace magnetization roasting separation process

Abstract

A sorting process of powdered refractory iron oxide ore cold-pressed ball agglomeration and shaft furnace magnetization roasting: use clay or bentonite and industrial magnesium chloride to make a combined binder; crush powdery iron oxide ore, mix the combined binder to make into cold-pressed balls and sieved; or, grinding powdered refractory iron oxide ore, separated by strong magnetic process, dehydrated, mixed with combined binder to make cold-pressed balls, and sieved; or produced tailings by strong magnetic separation , beneficiation process enrichment, after dehydration, mix with combined binder to make cold-pressed balls, and sieve; the materials on the sieve are dried and then sieved, the materials under the sieve are returned to the briquetting process, and the balls on the sieve are sent to the double-layer combustion chamber vertically The reduction reaction is carried out in the furnace, and after cooling, the grinding and separation system is completed to complete the grinding and weak magnetic separation. This process recycles and utilizes a large number of idle or discarded low-grade powdered iron oxide ore, expands the size range of the ore roasted in the shaft furnace, realizes the magnetization roasting of the powdery refractory iron oxide ore in the shaft furnace, and utilizes the shaft furnace to a greater extent. Ore roasting.

Description

Technical field [0001] The present invention belongs to the field of mineral selection technology, involving a process of selecting powder -shaped hard oxide ore with magnetized baking baking in vertical furnace, which involves a kind of pink -shaped difficulty of oxidation iron ore cold pressure balls, and selection of magnetized baking baking in vertical furnaces.Process. Background technique [0002] Poor ore reserves in my country's iron ore account for about 90%of the total reserves, and most of them are complicated and difficult to choose iron oxide ore.Under normal circumstances, complicated difficulty selection of iron oxide ore is selected by strong magnetic selection processes.Due to the complicated difficulty selection of iron oxide ore minerals, the grain size is thin and needed, and the strong magnetic selection equipment is very limited to the recycling of fine -grained iron minerals, so there is a disadvantage of low essence iron position and low recovery rate.If t...

AI Technical Summary

Problems solved by technology

However, the currently used Anshan-type shaft furnace, as a magnetization roasting equipment, can only roast ores with a particle size of 15-100 mm, which limits the utilization of powdered iron oxide ore using a shaft furnace to complete magnetization roasting

In the process of mining and crushing of raw materials, it is inevitable to produce fine ore with a particle size below 15mm. Because of the small particle size, this part of fine ore directly enters the shaft furnace for roasting, which has poor air permeability, poor reduction effect, and is easy to flow into the furnace and smelt. If using a rotary kiln with pulverized coal for roasting, there are also problems such as easy sticking to the kiln, low operation rate, and difficulty in smooth production.

Therefore, how to solve the problem of large-scale industrial reduction roasting of powdery refractory iron oxide ore, so far in China, there is no relevant technical report