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Method for producing natural gas through magnetizing hematite by coke-oven gas

A technology for hematite and natural gas, applied in chemical instruments and methods, gas fuel, magnetic separation, etc., can solve the problems of high SNG cost, high equipment investment, large operating cost, etc., and achieve high technical and economic indicators and simple process. Effect

Inactive Publication Date: 2012-01-11
TAIYUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above methods require deep purification of the coke oven gas first. The pretreatment process is long, the equipment investment is high, and the operating cost is high. As a result, the SNG produced is less competitive due to high cost.

Method used

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  • Method for producing natural gas through magnetizing hematite by coke-oven gas
  • Method for producing natural gas through magnetizing hematite by coke-oven gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Composition of coke oven gas: CH 4 25.3%, H 2 60.5%, CO 6.2%, C 2+ Unsaturated hydrocarbon 3.0%, CO 2 2.0%,O 2 0.5%, other 2.5% (mainly N 2 );

[0026] Hematite ore sample, T Fe :28.7%, of which magnetic iron T Fe :1.3%;

[0027] The hematite ore sample is crushed to -2mm 100%, placed in an anchor stirred reactor, and the temperature is raised to 350 o C, the coke oven gas is passed through, and the exhaust gas after reduction and magnetization is bubbled through 15% NaOH aqueous solution to remove CO 2 , and then with the help of CaCl 2The desiccant is dehydrated to obtain methane-rich artificial gas, and the composition of the artificial gas is monitored online with Shimadzu 17A. After reducing magnetization for 240 minutes, the temperature was lowered to normal temperature under the protection of nitrogen, and the magnetized ore sample was obtained. After analysis, the magnetic iron T Fe : 28.3%, magnetic susceptibility 98.5%. Composition of methane-r...

Embodiment 2

[0029] Composition of coke oven gas: CH 4 25.3%, H 2 60.5%, CO 6.2%, C 2+ Unsaturated hydrocarbon 3.0%, CO 2 2.0%,O 2 0.5%, other 2.5% (mainly N 2 );

[0030] Hematite ore sample, T Fe : 39.3%, of which magnetic iron T Fe :1.6%;

[0031] The hematite ore sample is crushed to -2mm 100%, placed in an anchor stirred reactor, and the temperature is raised to 450 o C, the coke oven gas is passed through, and the exhaust gas after reduction and magnetization is bubbled through 15% NaOH aqueous solution to remove CO 2 , and then with the help of CaCl 2 The desiccant is dehydrated to obtain methane-rich artificial gas, and the composition of the artificial gas is monitored online with Shimadzu 17A. After reducing magnetization for 180 minutes, the temperature was lowered to normal temperature under the protection of nitrogen, and the magnetized ore sample was obtained. After analysis, the magnetic iron T Fe : 38.8%, magnetic susceptibility 98.7%. Composition of methane...

Embodiment 3

[0033] Composition of coke oven gas: CH 4 25.3%, H 2 60.5%, CO 6.2%, C 2+ Unsaturated hydrocarbon 3.0%, CO 2 2.0%,O 2 0.5%, other 2.5% (mainly N 2 );

[0034] Hematite ore sample, T Fe :42.3%, of which magnetic iron T Fe :1.7%;

[0035] The hematite ore sample is crushed to -2mm 100%, placed in the anchor stirred reactor, and the temperature is raised to 550 o C, the coke oven gas is passed through, and the exhaust gas after reduction and magnetization is bubbled through 15% NaOH aqueous solution to remove CO 2 , and then with the help of CaCl 2 The desiccant is dehydrated to obtain methane-rich artificial gas, and the composition of the artificial gas is monitored online with Shimadzu 17A. After reducing magnetization for 120 minutes, the temperature was lowered to room temperature under the protection of nitrogen, and the magnetized ore sample was obtained. After analysis, the magnetic iron T Fe : 40.8%, magnetic susceptibility 96.3%. Composition of methane-r...

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Abstract

The invention discloses a method for synthesizing natural gas through magnetizing hematite by coke-oven gas. The method comprises the following steps of adding hematite powder with particle sizes less than or equal to 2mm into a reactor with a stirring structure, heating, then feeding coke-oven gas for a magnetization reaction, after the coke-oven gas undergoes the magnetization reaction, carrying out decarburization and dehydration to obtain natural gas, wherein non / weak magnetic Fe2O3 in the hematite powder is reduced to magnetic Fe3O4, carrying a direct pulping process or a wet grinding pulping process on the hematite powder subjected to the magnetization reaction, feeding the pulp obtained by the previous step into a magnetic separator for sorting, and carrying out magnetic mineral dehydration to obtain iron-containing concentrate. Through the method, hematite reduction magnetization and preparation of methane-rich synthetic gas by removal of CO / H2 from coke-oven gas are integrated optimally and thus two purposes are realized simultaneously. The method has simple processes, a low investment cost, good adaptability for all types of hematite, easy sorting of magnetized mineral, high iron concentrate product quality, and good economical efficiency.

Description

technical field [0001] The present invention is related to the sorting method of hematite, and is also related to synthetic natural gas (SNG); more specifically, it is a method of using coke oven gas to reduce and magnetize refractory low-grade hematite, and simultaneously produce methane-rich gas A method for the co-production of natural gas by magnetizing hematite with coke oven gas. Background technique [0002] The world's iron ore reserves are mainly concentrated in Ukraine, Russia, China, Australia and Brazil, and the combined reserves of the five countries account for 72% of the world's total reserves. Although China's iron ore reserves are large, ranking third after Ukraine and Russia, there are many lean ores and few rich ores, with an average grade of only 33%, which is more than 10% lower than the world's average grade, and it is difficult to sort The low-grade hematite accounts for nearly 1 / 4. [0003] China is the world's largest iron and steel country, but it...

Claims

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Application Information

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IPC IPC(8): C10L3/06C10L3/10C22B1/02B03C1/00
CPCY02P10/122
Inventor 杜文广刘守军上官炬高峰陈津
Owner TAIYUAN UNIV OF TECH