Method and system for reducing schreyerite through coal pyrolysis gas

A coal pyrolysis, vanadium-titanium ore technology, applied in the furnace type, furnace, shaft furnace and other directions, can solve the problems of increasing compressor investment, energy consumption waste, affecting the smooth running of furnace conditions, etc., to reduce water and electricity consumption, reduce production equipment, The effect of reducing the amount of equipment investment

Pending Publication Date: 2017-12-08
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the excessively high temperature of this method causes the pellets to stick together, which affects the smooth operation of the furnace, and the obtain

Method used

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  • Method and system for reducing schreyerite through coal pyrolysis gas
  • Method and system for reducing schreyerite through coal pyrolysis gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Crush the raw coal to a particle size of less than 5mm, and transport it to the top silo of the coal pyrolysis furnace for use, and transport the vanadium-titanium oxide pellets and semi-coke made of vanadium-titanium ore to the top silo of the shaft furnace for use, and the vanadium-titanium oxide balls Group: semi-coke = 100:10, vanadium-titanium oxide pellets, semi-coke main components and contents are shown in Table 1 and Table 2, and the gas heating furnace is heated by a ceramic radiant tube.

[0079] Table 1 Main components and content (%) of vanadium-titanium oxide pellets

[0080] Element

TF

FeO

Fe 2 o 3

V 2 o 5

TiO 2

content

57.12

23.09

55.15

0.65

15.77

[0081] Table 2 Semi-coke main components and content (%)

[0082] Element

C

Vad

Aad

mad

content

67.8

7.55

23.76

0.89

[0083] The raw coal is continuously fed from the top of the coal pyrolysis ...

Embodiment 2

[0090]Crush the raw coal to a particle size of less than 5mm, and transport it to the top silo of the coal pyrolysis furnace for use, and transport the vanadium-titanium oxide pellets and semi-coke made of vanadium-titanium ore to the top silo of the shaft furnace for use, and the vanadium-titanium oxide balls Pellet: semi-coke = 100:8, the main components and content of vanadium-titanium oxide pellets and semi-coke are shown in Table 1 and Table 5, and the gas heating furnace is heated by a ceramic radiant tube.

[0091] Table 5 Main components and content of semi-coke (%)

[0092] Element

C

Vad

Aad

mad

content

64.3

8.55

26.11

0.88

[0093] The raw coal is continuously fed from the top of the coal pyrolysis furnace through the feeding screw, the coal powder stays in the furnace for 1.5s, and is pyrolyzed during the downward process of the pulverized coal in the pyrolysis device to generate solid semi-coke and pyrolysis gas, semi...

Embodiment 3

[0100] Crush the raw coal to a particle size of less than 5mm, and transport it to the top silo of the coal pyrolysis furnace for use, and transport the vanadium-titanium oxide pellets and semi-coke made of vanadium-titanium ore to the top silo of the shaft furnace for use, and the vanadium-titanium oxide balls Group: semi-coke = 100:15, vanadium-titanium oxide pellets, semi-coke main components and contents are shown in Table 1 and Table 8, and the gas heating furnace is heated by a ceramic radiant tube.

[0101] Table 8 Semi-coke main components and content (%)

[0102] Element

C

Vad

Aad

mad

content

66.2

8.33

24.17

0.89

[0103] The raw coal is continuously fed from the top of the coal pyrolysis furnace through the feeding screw, the coal powder stays in the furnace for 1.5s, and is pyrolyzed during the downward process of the pulverized coal in the pyrolysis device to generate solid semi-coke and pyrolysis gas, semi-coke , Th...

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Abstract

The present invention proposes a method and system for reducing vanadium-titanium ore with coal pyrolysis gas. The method includes the steps of: coal pyrolysis: adding raw coal from the coal pyrolysis furnace silo to the coal pyrolysis furnace, at a temperature of 700-900°C , pyrolysis to generate solid semi-coke and pyrolysis gas; pyrolysis gas heating: the pyrolysis gas enters the heating furnace through the pipeline to be heated to obtain a high-temperature reducing gas of 1000‑1100 °C; vanadium-titanium ore reduction: the high-temperature reducing gas is transported After entering the shaft furnace, react with semi-coke, and reduce vanadium-titanium ore to obtain reduced vanadium-titanium metallized pellets; wherein, the pressure of reducing gas entering the shaft furnace is 0.45MPa-0.9MPa, and the temperature is 950-1050 ℃. The invention organically combines coal chemical industry with metallurgical production, effectively utilizes H2O and CO2 in coal pyrolysis gas to oxidize semi-coke, so as to increase the content of reducing gas and reduce the production cost and energy consumption of vanadium-titanium direct reduction iron.

Description

technical field [0001] The invention relates to the technical field of chemical metallurgy, in particular to a method and system for reducing vanadium-titanium ore with coal pyrolysis gas. Background technique [0002] When the traditional blast furnace process or non-blast furnace coal-based direct reduction process is used to smelt alum-titanium-magnetite, only iron and vanadium are recovered, and the titanium grade in the slag is too low to have an economical and reasonable recovery value, resulting in a large loss of titanium resources. [0003] Because the gas-based direct reduction method has the characteristics of high efficiency, low pollution, and no dependence on coking coal, it has become a new technology that gradually replaces the traditional blast furnace ironmaking technology and has been widely used worldwide. The current direct reduction process mainly uses natural gas as the reducing agent, and the reducing agent cracking heating furnace (petrochemical furn...

Claims

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Application Information

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IPC IPC(8): C21B13/02C22B34/12C22B34/22
CPCC21B13/02C21B13/0073C22B34/1218C22B34/22
Inventor 邓君曹志成唐敬坤冯鲁兴韩志彪吴道洪
Owner SHENWU TECH GRP CO LTD
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