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Rotary hearth furnace treatment process for iron-containing dust slime

A treatment process and rotary hearth furnace technology, applied in the field of metallurgy, can solve problems such as affecting the smooth running of the rotary hearth furnace process, poor adaptability to flue gas working conditions, and increasing system complexity, so as to reduce drying links and increase energy utilization. , to avoid the effect of clogging

Inactive Publication Date: 2017-11-07
CHONGQING CISDI THERMAL & ENVIRONMENTAL ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Raw material drying brings additional energy consumption and increases system complexity
[0004] The heat exchanger in the flue gas system of the existing rotary hearth furnace is always installed before the dust removal, and has poor adaptability to the flue gas working conditions, which often leads to the blockage of the flue gas system and seriously affects the forward flow of the rotary hearth furnace process

Method used

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  • Rotary hearth furnace treatment process for iron-containing dust slime

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Embodiment 1

[0037] A, mix iron-containing dust sludge, metallurgical dedusting dry ash (blast furnace bag ash, cast iron dust removal ash, etc.) according to the C / O molar ratio of 1.1, and control the moisture content of the ingredients to ≤10%;

[0038] B. Add a binder to the ingredients and adjust the water content to ≤13%, and then mix evenly;

[0039] C. Use a double-roller briquetting machine with a linear pressure of 3-8t / cm to form cold-pressed balls, and consolidate them into ellipsoidal green pellets with a size of 32×25×18mm;

[0040] D. Enter the through-flow mesh belt dryer, and the lower part is ventilated and dried to reduce the water content of the raw pellets to less than 2%;

[0041] E. Evenly distribute the dried green pellets on the rotary hearth furnace tray, the thickness of the cloth is about 2 layers; the rotary hearth furnace is divided into 4 areas, the temperature is 1150 ° C, 1200 ° C, 1250 ° C, 1300 ° C, the reduction time 15-30min, speed 25min / r; after reduc...

Embodiment 2

[0045] In this embodiment, the metallurgical dedusting ash used as carbon blending can be replaced by pulverized coal. At this time, the pulverized coal needs to be ground and filtered with a sieve mesh with a mesh size of not more than 100 mesh before being mixed with iron-containing dust.

[0046] In this embodiment, the dust collector in the flue gas system of the rotary hearth furnace can also be replaced by other forms of high temperature resistant dust collector.

[0047] In this embodiment, the cold consolidation method of material forming may also be disc pelletizing or extrusion forming.

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Abstract

The invention belongs to the field of metallurgy and particularly discloses a rotary hearth furnace treatment process for iron-containing dust slime. The rotary hearth furnace treatment process comprises the steps that the iron-containing dust slime, pulverized coal and / or carbon-containing dedusting ash are subjected to proportioning, a binding agent is added, and uniform mixing is conducted; after cold consolidation molding and drying are conducted, the mixture is fed into a rotary hearth furnace to be reduced; high-temperature pellets obtained after reduction are subjected to temperature reduction and heat recycling through a solid waste heat boiler; and flue gas of the rotary hearth furnace is subjected to step-by-step heat recycling through the waste heat boiler, a heat exchanger and fresh pellet drying equipment in sequence. According to the rotary hearth furnace treatment process for the iron-containing dust slime, the drying and energy consumption links of the raw material slime are omitted, the blocking problem of the flue gas system heat exchanger is solved, heat gradient utilization and recycling maximization are achieved, smooth operation and low energy consumption of a rotary hearth furnace production line are ensured, and the market competitiveness of the rotary hearth furnace process can be significantly improved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a rotary hearth furnace treatment process for iron-containing dust and mud. Background technique [0002] Iron-containing dust and sludge, especially in metallurgical enterprises, is a common problem in the recycling of iron-containing dust and sludge. When returning to sintering, there are difficulties in mixing, large fluctuations in composition, and affecting the permeability of the sintering bed. Harmful impurities such as zinc, lead, potassium, and sodium Iron-containing dust and sludge exceeding the standard cannot be returned to sintering for utilization, and usually can only be stockpiled and landfilled. Direct reduction treatment of iron-containing dust and sludge is an advanced technology in line with the trend of energy saving, environmental protection, and comprehensive utilization of resources. However, in this type of technology, the treatment processes such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/04C21B13/10C22B1/02C22B1/248
CPCC21B3/04C21B13/105C22B1/02C22B1/248Y02W30/50
Inventor 郭秀键田文杰王强雍海泉
Owner CHONGQING CISDI THERMAL & ENVIRONMENTAL ENG CO LTD
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