Method for utilizing iron containing metallurgical dust

Abstract

The invention relates to a method for utilizing iron containing metallurgical dust, which comprises that: steel-making sludge, metallurgical dust-removing powder and iron scale are mixed; the mixed raw materials are sent into a rotary kiln and dried, and the drying temperature is determined according to moisture content of the raw materials and controlled to be between 300 and 500 DEG C; the dried materials are cooled by a cooler, the cooled materials are added with 5 to 10 percent of caking agent by weight, and the material and the caking agent are fully stirred evenly by a wheel-rolling mixer; and finally, the mixture is pressed into cooled agglomerated pellet products by a twin-roller machine, the pressure of the twin-roller machine is more than or equal to 500 Kg/cm<2>, and the cooled agglomerated pellet products are prepared into finished products after separation by a vibration sieve. The method has the advantages of low production energy consumption, high product strength, low moisture content and good quality, and can realize full effective utilization of resources; and the finished products of cooled agglomerated pellets can be directly used as a cooling agent and a slag former in steel making, can improve smelting effect and achieve functions of cooling and slag forming, and can be also used for blast furnace process.

Description

【Technical field】 [0001] The present invention relates to a method for resource utilization of iron-containing dust and sludge in metallurgical industry, in particular to a method for comprehensive resource utilization of sludge, smoke, iron oxide scale and other iron-containing powders produced in the production process of iron and steel industry The utilization method of metallurgical iron-containing dust sludge. 【Background technique】 [0002] In the production process of the iron and steel industry, a large amount of sludge, soot, iron oxide scale and other iron-containing powders are produced, and increase in proportion to the expansion of steel production scale. The main components of these dust sludge are iron-containing raw materials, and the iron content is TFe40%~60%. How to effectively use this part of iron-containing resources to turn waste into treasure is a common concern of iron and steel production enterprises. [0003] Iron-containing dust such as steelmaki...

AI Technical Summary

Problems solved by technology

With the promulgation of environmental protection measures and the needs of various steel mills to recycle resources, iron and steel enterprises are exploring ways to utilize iron-containing dust such as sludge. Lower yield and quality of sinter

Although the output and quality of sintered ore have been improved by adding iron oxide scale, due to the low added value of sludge as ore blending, the high energy consumption, the long process of forming products, and the low utilization rate and metal recovery rate cannot Give full play to its utilization value and cause greater waste

Moreover, after the converter sludge is press-filtered at the treatment station, it is difficult to evenly mix into the mineral material because the sludge is too wet; and it becomes hard lumps after drying, and it is also difficult to evenly mix into the mine; the sludge is piled together. It not only occupies the site, but also becomes a source of dust pollution, which directly leads to the fact that this part of resources has not been well utilized at present

Then began the research and application of the technology of pelletizing the sludge to produce pellets. After the sludge was pelletized, it was roasted at high temperature to produce pellets. However, the project investment was large and caused environmental pollution, so it was not widely used.

Images