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Metallurgical solid waste comprehensive utilizing method

A technology for metallurgical dust and iron and steel smelting, applied in the direction of improving process efficiency, etc., can solve the problems of low added value of products, poor wearability and activity, difficult industrialization, etc., and achieve significant environmental protection benefits, significant economic benefits, process equipment simple effect

Inactive Publication Date: 2018-02-13
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the blast furnace slag is mainly used as cement admixture after water quenching treatment, and the converter slag is mostly used for thermal simmering treatment, so that the free calcium oxide and magnesium oxide are digested and then used in cement, brick making, road paving, etc., but the composition of steel slag is complex and easy Poor abrasiveness and activity, compared with blast furnace water-quenched slag, the added value of the product is low
[0004] At present, there are existing patents and literature reports on converter slag modification or carbon powder injection reduction and modification. The disadvantage is that a large amount of coal powder, quartz sand or lime is consumed, and coal powder is added by injection, which increases the equipment cost. Complexity and investment. In addition, without further research and treatment of slag after iron extraction, the entire process is not economical and difficult to industrialize

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for comprehensive utilization of metallurgical solid waste, comprising the steps of:

[0030] 1) Ingredients: In this embodiment, high-temperature molten converter slag, blast furnace gas ash, and coal powder are used as raw materials to calculate the proportion of raw materials, and calculate and control the CaO and Al in the obtained mixture. 2 o 3 , SiO 2 , MgO formed in the quaternary slag system, the mass percentage of each component is: CaO 67.48%, SiO 2 23.04%, MgO 5.47%, Al 2 o 3 4.01%, and control the molar ratio of the sum of the oxygen atom content in the iron oxide, zinc oxide, and iron oxide in the metallurgical slag to the carbon atom content in the obtained mixture to be 1.2; the composition and content of each raw material are shown in Table 1 ;

[0031] 2) Dust pelletizing: mix coal powder and blast furnace gas ash evenly, and use a briquette machine to press into raw pellets with a particle size of 3-20mm, then send them to a drying ove...

Embodiment 2

[0040] A method for comprehensive utilization of metallurgical solid waste, comprising the steps of:

[0041] 1) Ingredients: In this embodiment, high-temperature molten converter slag, blast furnace gas ash, coal powder, and quartz sand are used as raw materials to calculate the ratio of raw materials, and control the CaO and Al in the obtained mixture. 2 o 3 , SiO 2 , MgO formed in the quaternary slag system, the mass percentage of each component is: CaO 65.6%, SiO 2 25.14%, MgO 5.31%, Al 2 o 3 3.89%, and control the molar ratio of the sum of the oxygen atom content in the iron oxide, zinc oxide, and iron oxide in the metallurgical slag to the carbon atom content in the obtained mixture to be 1:1.2; the composition and content of each raw material are shown in Table 2;

[0042] 2) Dust pelletizing: mix quartz sand, coal powder and blast furnace gas ash evenly, and use a briquette machine to press into green balls with a particle size of 3-20mm, then send them to a dryin...

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Abstract

The invention discloses a metallurgical solid waste comprehensive utilizing method. Dust sludge containing iron, carbon and zinc is added into high-temperature molten slag in the slag tapping process,the sensible heat of the molten slag and the carbon resource in the dust sludge are fully utilized, the carbon resource makes a reduction reaction with iron and zinc in the high-temperature molten slag and the dust sludge, and valuable resources such as iron and zinc in the dust sludge and the molten slag are recycled synchronously; and after the iron and zinc are removed simultaneously, high added-value utilization of the residual molten slag can be achieved by controlling the components and the cooling mode of the mixed molten slag. Waste heat of the high-temperature molten slag is fully utilized, the problem that when the dust sludge containing zinc returns to be sintered and reused, zinc is circularly enriched, and accordingly smooth operation of a blast furnace is affected can be solved effectively, high added-value utilization and clean production of the molten slag are achieved, and thus the metallurgical solid waste comprehensive utilizing method has good economic and environmental benefits and is suitable for being applied and popularized.

Description

technical field [0001] The invention belongs to the technical field of metallurgical solid waste treatment, and in particular relates to a solid waste comprehensive utilization method utilizing smelting slag and metallurgical dust. Background technique [0002] Metallurgical dust is the main smoke and dust waste discharged during the production process of the iron and steel industry, and the emission is about 10% of the crude steel output. Based on the calculation of my country's crude steel output of 808 million tons in 2016, the amount of dust and sludge produced is about 80.8 million tons. Adding the amount of storage over the years, the amount of metallurgical dust and sludge is huge. The dust contains about 30-40% iron, 2-3% zinc, and 15-30% carbon in some dust. If all resource utilization is realized, about 20-30 million tons of iron, about 2 million tons of zinc, and 4.8 million tons of carbon can be recovered each year, which can replace a large number of mineral re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B7/02C22B19/30C22B19/04
CPCC22B7/001C22B7/02C22B7/04C22B19/04C22B19/30Y02P10/20
Inventor 李菊艳张国兴
Owner WISDRI ENG & RES INC LTD