A short-process steelmaking process of biomass iron-containing agglomerates and a method for producing stainless steel

A biomass and short-process technology, applied in the field of iron and steel metallurgy, can solve the problems of short-process steelmaking of biomass iron-containing agglomerates, etc., to improve energy utilization efficiency, improve gasification yield, and promote biomass gasification. Effect

Active Publication Date: 2019-05-07
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem in the prior art that the short-process steelmaking of biomass iron-containing agglomerates has not been realized in the prior art, and provide a method for short-process steelmaking and stainless steel production of biomass iron-containing agglomerates;

Method used

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  • A short-process steelmaking process of biomass iron-containing agglomerates and a method for producing stainless steel
  • A short-process steelmaking process of biomass iron-containing agglomerates and a method for producing stainless steel
  • A short-process steelmaking process of biomass iron-containing agglomerates and a method for producing stainless steel

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Experimental program
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Effect test

Embodiment 1

[0046] In the process of previous research, the application has made a series of breakthroughs, and has improved the gasification yield and the quality of direct reduced iron, with significant progress, and applied for an invention patent (2017101469513-a biomass gasification and direct reduction The iron co-production method and additives used, the application date is: 2016-03-13). In the process of continuing research, the applicant further adopted the short-process steelmaking process of biomass iron-containing agglomerates, and prepared high-quality molten steel, which greatly shortened the process of iron and steel smelting and improved the efficiency of smelting.

[0047] The applicant conducted further in-depth research, and creatively proposed that no binder is added to the iron-containing agglomerate, and the modified biomass and iron-containing raw materials are hot-pressed at high temperature to improve the iron-containing agglomerate. strength, avoiding the crushin...

Embodiment 2

[0086] The basic content of this embodiment is the same as embodiment 1, the difference is:

[0087] The additive in the step 1 is composed of sodium carbonate, laterite nickel ore, dolomite, plant ash and chromium slag; the mass percentage of each component is: sodium carbonate: 15%, laterite nickel ore: 30%, dolomite: 30%, Plant ash: 15%, chromium residue: 10%. Described chromium slag chemical composition mass percent is as follows: SiO 2 : 28%, Al 2 o 3 : 8%, CaO: 30%, MgO: 15%, Fe 2 o 3 : 10%, Cr 2 o 6 : 0.8% and Na 2 Cr 2 o 7 : 1%, the rest are impurities. The metallization rate of direct reduced iron, biomass gasification yield and tar yield were detected after the reaction. The experimental results are recorded in Table 1. It should be noted that the modified solution is an alkaline solution, the alkaline solution is a KOH solution, and the mass concentration of the KOH solution is 3%. On the one hand, the chromium slag can effectively reduce the chromium s...

Embodiment 3

[0091] The basic content of this embodiment is the same as embodiment 1, the difference is:

[0092] The iron ore concentrate of described step 1 is made up of Hayangdi, Tubarang powder, Canadian fine powder, Kazakhstan powder and Jinbuba powder, and the composition of ore is as shown in table 2, and the mass percent of various mineral powders is: Hayangdi: 10%, Tubalang powder: 20%, Canadian fine powder: 40%, Kazakh powder: 15%, Jinbuba powder: 15%. The metallization rate of direct reduced iron, biomass gasification yield, and tar yield were detected after the reaction. The experimental results are recorded in Table 1.

[0093] Table 2 Mineral powder composition (wt / %)

[0094]

[0095] It is worth noting that the modified solution is an alkaline solution, and the alkaline solution is NaOH and Ca(OH) 2 The mixed solution, the mass concentration of the mixed solution is 4%, NaOH and Ca(OH) 2 The mass ratio is 4:1.

[0096]The second step: electric furnace smelting: hot ...

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Abstract

The invention provides a biomass iron-containing block mass short-course steel-making method and a biomass iron-containing block mass stainless steel production method and belongs to the technical field of ferrous metallurgy. The steel-making method comprises the following steps: step I, producing direct reduction iron: iron-containing block masses are placed in a high-temperature container to be heated, and a ferric oxide is reduced to generate direct reduction iron; and step II, smelting in an electric furnace: direct reduction iron is hot-charged and fed into the electric surface, a slag former is added into the electric furnace, and steel is discharged after oxygen blowing smelting. The biomass iron-containing block mass stainless steel production method is characterized in that molten steel is added into an AOD furnace to be decarbonized and heated, a chromium-containing metal raw material is added into the furnace for alloying, and molten steel is conveyed into a VOD furnace for deep decarbonization to obtain stainless steel. The iron-containing block masses are reduced to generate direct reduction iron, and direct reduction iron is hot-charged and fed into the electric furnace to be smelted to obtain qualified molten steel, so that short-course steel-making of the biomass iron-containing block masses is realized, and the energy utilization efficiency is improved; and stainless steel can be further produced through smelting.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, and more specifically relates to a short-process steelmaking method of biomass iron-containing agglomerates and a method for producing stainless steel. Background technique [0002] Direct reduction is a process in which iron oxides are reduced to metallic iron in a solid state without melting or slagging. Direct reduction products are collectively referred to as direct reduction iron (Direct Reduction Iron, abbreviated as DRI). Direct reduction is a technology that has achieved large-scale industrial production. There are dozens of direct reduction methods that have achieved industrial production. In 2008, the world's direct reduced iron (DRI / HBI) output was about 68.45 million tons, about 7.23% of the world's pig iron output of 930 million tons. Due to its pure product, stable quality and excellent metallurgical properties, direct reduced iron has become an indispensable raw ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00C22B1/24C21C5/52C22C33/04
CPCC21B13/0066C21B13/008C21C5/005C21C5/52C22B1/24C22C33/04Y02P10/20
Inventor 龙红明魏汝飞李家新王平孟庆民春铁军狄瞻霞余正伟李宁王凯祥
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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