Process for producing high-carbon ferrochrome from coal synthesis gas

A coal-to-synthesis gas and high-carbon ferrochrome technology, applied in the direction of furnaces, shaft furnaces, furnace types, etc., to achieve the effects of less production, less harmful impurities, and good quality

Inactive Publication Date: 2020-03-24
明拓集团铬业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional smelting methods consume 500-550 kg of coke and 3000-4000 degrees of electricity per ton of high-carbon ferrochrome

Method used

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  • Process for producing high-carbon ferrochrome from coal synthesis gas

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Embodiment 1

[0026] A process for producing high-carbon ferrochrome from coal-to-synthesis gas, comprising the steps of:

[0027] 1) Preparation of coal-to-synthesis gas and chromite pellets;

[0028] 2) After the coal-based synthesis gas is purified and preheated, it is fed into the reaction shaft furnace from the bottom, and the chromite pellets are added into the reaction shaft furnace from the top, and the coal-based synthesis gas contacts with the falling chromite pellets in countercurrent and undergoes reduction reaction to generate metallized pellets;

[0029] 3) Send the formed metallized pellets into a submerged arc furnace through a heat conveying device, add a flux and a reducing agent, melt them, and separate the slag and iron to obtain high-carbon ferrochromium;

[0030] In step 1), the preparation of coal-to-synthesis gas includes: using a coal mill to grind raw coal into fine powder, using nitrogen or carbon dioxide gas to pressurize the coal powder into the gasifier to rea...

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Abstract

The invention provides a process for producing high-carbon ferrochrome from coal synthesis gas. The process comprises the following steps of: 1) preparing the coal synthesis gas and chromite pellets,2) purifying and preheating the coal synthesis gas, feeding the coal synthesis gas into a reaction shaft furnace from the lower part, adding the chromite pellets into the reaction shaft furnace from the upper part, and performing reduction reaction after the coal synthesis gas is in contact with the descending chromite pellets to generate metallized pellets, and 3) feeding the generated metallizedpellets into a submerged arc furnace, adding a fluxing agent and a reducing agent, melting, and separating slag from iron to obtain high-carbon ferrochrome. The process reduces power consumption andemission, is relatively environment-friendly, and reduces chromite pellets by utilizing purified synthesis gas, so that the generated product has few impurities.

Description

technical field [0001] The invention relates to a production process of high-carbon ferrochrome. Background technique [0002] Chromium is the only element that determines the properties of stainless steel, and there is no stainless steel without chromium. In the 1950s and 1960s, vacuum decarburization VOD technology and argon-oxygen refining AOD technology were developed, and high-carbon ferrochromium became the raw material for stainless steel smelting. It takes 1 ton of high carbon ferrochrome to produce 3.3 tons of stainless steel. In 1919, Dr. Carl William Soderberg of Norway invented the submerged arc furnace using self-forming electrodes. The traditional high-carbon ferrochrome process has a history of one hundred years. Traditional high-carbon ferrochrome smelting uses chromium ore as raw material, silica as slag-forming flux, and coke to carry out carbon reduction in an electrically heated submerged thermal reduction furnace. It is an electrothermal process of co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/214C22B4/06
CPCC22B1/214C22B4/06
Inventor 陶静陶旭
Owner 明拓集团铬业科技有限公司
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