A kind of steel slag iron fine powder production process

Abstract

The invention discloses a high-quality steel slag iron powder production process. Solid slag is subjected to magnetic separation, rough smashing, magnetic separation and fine smashing, then the solidslag enters a ball mill to be ground, ground products pass through a rotary screen, and particle steel and slag powder are separated out; the particle steel is a final product, the slag powder passesthrough a birotor powder concentrator, tailings and rough middlings are separated out, and the tailings are final products; the rough powder passes through a magnetic separation roller, and tailings and steel slag iron powder are separated out; low-temperature smoke introduced through a high-temperature draught fan and high-temperature smoke are mixed in a smoke furnace, then enter the ball mill and serve as a drying agent for drying the solid slag and a carrier for conveying part of the tailings; gas-solid separation is achieved in a bag dust collector, gas is exhausted to the air through a main smoke exhaust fan, and solid is tailings. According to the high-quality steel slag iron powder production process, except for a smashing procedure, the negative pressure control technology is adopted in the whole process, and the beneficial effects of generating no circulating sewage or dust, being free of weather influence on production, effectively improving the grade of steel slag iron powder, reducing steel smelting production cost and the like are achieved.

Description

technical field [0001] The invention relates to the field of ore dressing, in particular to a production process of steel slag and iron fine powder. Background technique [0002] Iron and steel metallurgical solid slag is produced in the ironmaking and steelmaking processes of iron and steel enterprises, and its output is about 13% to 20% of steel output. At present, the annual output of solid slag in my country exceeds 100 million tons, and the iron content reaches 15% to 20%. , About 15-20 million tons. For this reason, many manufacturers at home and abroad have carried out research and development on the recycling and comprehensive utilization of solid slag, but the most widely used so far is the steel slag iron powder extracted after crushing and magnetic separation, and its iron content is only 35%. ~55%, used for ironmaking and sintering ingredients, and tailings as raw materials for making cement. [0003] If the iron in the solid slag cannot be effectively extracted...

AI Technical Summary

Problems solved by technology

However, this process has the following disadvantages: 1. The circulating water is easy to pollute the groundwater; 2. The winter in the northern region is cold, and the production line is forced to stop production; Low; 4. The cyclic enrichment of harmful elements such as phosphorus and bismuth increases the cost of steelmaking; 5. The composition of molten iron is difficult to meet the smelting of some special steels

However, this process also has the following disadvantages: 1. The dust concentration at the production site is high and the working environment is harsh; 2. The difference in the content of steel slag iron concentrate and tailing slag is small, the utilization rate of the magnetic field is not high, and the recovery rate is low; 3. Phosphorus, bismuth Harmful elements such as cyclic enrichment, steelmaking costs increase; 4. The composition of molten iron is difficult to meet the smelting of some special steels; 5. It is easy to harden in processing or transportation equipment, and it is difficult to clean

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