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A method of using biomass as a bonding carrier to prepare high-strength iron-containing agglomerates and gas-iron cogeneration

A biomass and high-strength technology, applied in the field of ironmaking, can solve the problems of affecting pellet reaction and reduction process, cracking incomplete tar, waste of biomass energy, etc., so as to reduce tar content, strengthen ion deviation effect, and promote The effect of decomposition

Active Publication Date: 2019-05-17
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method often uses biomass as a substitute for fuel, but in the process of reducing ore, biomass is accompanied by cracking of biomass. In this process, biomass is prone to incomplete cracking and produces a large amount of tar, which not only causes Waste of material and energy, and cause serious environmental pollution, this problem needs to be solved urgently
Moreover, the existing biomass pellets have poor strength, which affects the further reaction and reduction process of the pellets

Method used

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  • A method of using biomass as a bonding carrier to prepare high-strength iron-containing agglomerates and gas-iron cogeneration
  • A method of using biomass as a bonding carrier to prepare high-strength iron-containing agglomerates and gas-iron cogeneration
  • A method of using biomass as a bonding carrier to prepare high-strength iron-containing agglomerates and gas-iron cogeneration

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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 found that when using biomass iron-containing agglomerates to produce combustible gas and direct reduced iron, the strength of the produced iron-containing agglomerates is relatively poor, and it is easy to cause the iron-containing agglomerates to be crushed. Then affect the reduction process of iron-containing agglomerates; in addition, the binder will also affect the iron taste and gas yield of direct reduced iron. In order to further improve the quality of direct reduced iron, the applicant has carried out further in-depth research and...

Embodiment 2

[0080] The basic content of the present embodiment is the same as that of Example 1, except that the additive is composed of sodium carbonate, laterite nickel ore, dolomite, plant ash and chromium slag; the mass percent of each component is: sodium carbonate: 15% , Laterite nickel ore: 30%, dolomite: 30%, plant ash: 15%, chromium slag: 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. On the one hand, the chromium slag can effectively reduce the chromium slag under the high reducing condition of biomass gasification to generate low-priced chromium oxides. The combination of chromium oxides with iron oxides and calcium-magnesium compounds in th...

Embodiment 3

[0083] The basic content of this embodiment is the same as that of Example 1, except that the iron ore concentrate is made up of Hayangdi, Tubalang powder, Canadian fine powder, Kazakh mixed powder and Jinbuba powder, and the composition of the ore is as shown in Table 2 Shown, the mass percentages of various mineral powders are: Hayangdi: 10%, Tubalang powder: 20%, Canadian refined powder: 40%, Kazakhstan 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.

[0084] Table 2 Mineral powder composition (wt / %)

[0085]

[0086] The metallization rate of direct reduced iron is further improved. Through repeated discussions, the inventor believes that this process may be due to the fact that the crystal water in the iron ore powder is heated and decomposed during the heat preservation process at 900°C, and produces more These...

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Abstract

The invention discloses a gas iron co-production method for preparing a high-strength iron-contained block mass with biomass as an adhesive carrier, and belongs to the technical field of steel iron smelting. According to the preparing method of the iron-contained block mass, iron-contained raw materials, biomass and an addition agent are mixed, and are subject to hot pressing through a briquetting machine to obtain the iron-contained block mass, and the biomass is subject to modification treatment through a modification solution. According to the specific method, the biomass is immersed into the modified solution to be modified, the modified biomass, the iron-contained raw material and the addition agent are mixed and pressurized, the iron-contained block mass is prepared, the mass is heated in a high-temperature container, the biomass is gasified into combustible gas, and an iron oxide is reduced to generate direct reduction iron. The biomass serves as a reduction agent of the iron oxide and a C source and an H source of combustible gas, the iron oxide serves as an iron source and an oxygen source, a bonding agent does not need to be added, the strength of the iron-contained block mass is improved, the biomass gasifying yield is improved, and meanwhile, the metallization rati of iron direct reduction is improved.

Description

technical field [0001] The invention relates to the technical field of ironmaking, and more specifically relates to a method for preparing high-strength iron-containing agglomerates and gas-iron cogeneration using biomass as a bonding carrier. Background technique [0002] Biomass energy is the energy form of solar energy stored in biomass in the form of chemical energy, that is, the energy with biomass as the carrier. It is directly or indirectly derived from the photosynthesis of green plants and is a renewable energy source. Biomass energy has the advantages of renewable, low pollution and wide distribution. Rational use of biomass energy can effectively reduce dependence on fossil energy and reduce environmental pollution caused by energy consumption. Nowadays, the development and utilization of biomass energy has become the focus of international attention, and biomass energy technology has a very broad development prospect. During the application of existing biomass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/244C22B1/243
CPCC22B1/2413C22B1/243C22B1/244
Inventor 魏汝飞龙红明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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