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Method for producing ferrochrome

A ferrochromium alloy and production process technology, which is applied in the field of producing ferrochromium alloy by grate machine-rotary kiln combined metallized pellet hot charging, can solve the problem of inability to produce ferrochromium alloy lumps, etc., and achieves reduction of power consumption and cost, and improvement of work efficiency. Efficiency, the effect of overcoming pollution

Inactive Publication Date: 2015-05-20
HEBEI TAIHANG FOUND MINERAL RESOURCES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent CN101144110A is titled "Method for Directly Producing Ferrochrome Alloy Using Chromium Ore Powder and Coal", which can only produce fine ferrochrome particles, but cannot produce commonly used ferrochrome alloy lumps

Method used

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  • Method for producing ferrochrome
  • Method for producing ferrochrome

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Experimental program
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Embodiment 1

[0036] First, 16% of coke powder, 2.5% of bentonite, and the balance of chrome ore are used in the mixed batching, and the SiO in the batching is controlled. 2The weight ratio of MgO is 2.5%, and the weight ratio of MgO is 8%; the dried mixed ingredients are ball milled to -0.074mm, which is greater than 90%, and then sprayed with water and mixed until the weight moisture content of the mixture is 12%, and then heated at room temperature After waking up for 3 hours, make pellets, the particle size of the pellets is Φ16±2mm; the pellets are dried and preheated with a grate machine, the drying temperature is 40°C, and the drying time is 30 minutes. The waste heat is returned to the drying process of the mixed ingredients; then the rotary kiln pellet pre-reduction process is carried out. The pre-reduction process is to use the rotary kiln for pellet pre-reduction. The reduction rate of chromium is controlled at 50%, the reduction temperature is 1350 ° C, and the reduction time is ...

Embodiment 2

[0038] First, 20% of coke powder, 4% of bentonite, and the balance of chromium ore are mixed in the weight ratio, and the SiO in the batch is controlled. 2 The weight ratio of MgO is 7%, and the weight ratio of MgO is 14%; the dried mixed ingredients are ball-milled to -0.074mm, which is greater than 90%, and then sprayed with water and mixed until the weight moisture content of the mixture is 15%, and then heated at room temperature After waking up for 9 hours, make pellets, and the particle size of the pellets is Φ16±2mm; the pellets are dried and preheated with a grate machine, and the drying temperature is 900°C, and the drying time is 10 minutes. The waste heat is returned to the drying process of the mixed ingredients; then the rotary kiln pellet pre-reduction process is carried out. The pre-reduction process is to use the rotary kiln for pellet pre-reduction. The reduction rate of chromium is controlled at 55%, the reduction temperature is 1400 ° C, and the reduction tim...

Embodiment 3

[0040] First, 24% of coke powder, 5% of bentonite, and the balance of chrome ore are mixed in the weight ratio, and the SiO in the batch is controlled. 2 The weight ratio of MgO is 8%, and the weight ratio of MgO is 16%; the dried mixed ingredients are ball-milled to -0.074mm, which is greater than 90%, and then sprayed with water and mixed until the weight moisture content of the mixture is 15%, and then heated at room temperature After waking up the material for more than 10 hours, pelletize, and the particle size of the pellets is Φ16±2mm; the pellets are dried and preheated with a grate machine, and the drying temperature is 600°C for 18 minutes, and the drying preheating process produces The residual heat is returned to the drying process of the mixed ingredients; then the rotary kiln pellet pre-reduction process is carried out. The pre-reduction process is to use the rotary kiln for pellet pre-reduction. The reduction rate of chromium is controlled at 65%, the reduction t...

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Abstract

The invention discloses a method for producing ferrochrome and relates to chain grate-rotary kiln combined metalized pellet hot-filled methods for producing ferrochrome. The method is characterized in that a production process sequentially comprises the steps of proportioning materials, drying, carrying out ball milling, carrying out water-sprayed mulling, carrying out material waking, pelletizing, carrying out drying and preheating, carrying out rotary kiln pellet prereduction, carrying out hot filling and carrying out submerged-arc furnace smelting. According to the method disclosed by the invention, through material proportioning, ball milling and pelletizing, exhaust gas of a rotary kiln is used for drying and preheating in a chain grate, coal gas of a closed submerged-arc furnace and natural gas are used for heating, carbon in coke powder is used for reducing oxides of chromium and iron in chromite ore powder pellets, the comprehensive reduction rate of metal is controlled to reach 55-70%, the pellets are enabled to be metalized, and then, hot filling is used for carrying out transporting so as to supply high-carbon ferrochrome to submerged-arc furnace smelting. The method disclosed by the invention has the advantages that furnace conditions are effectively improved, the production process is stable in process, the reduction efficiency is high, the power consumption is low, the production cycle of the submerged-arc furnace is shortened, the consumption of the raw materials is low, the metal recovery rate is high, and the discharge of pollutants, such as dust and SO2, is low.

Description

technical field [0001] The invention relates to a method for producing ferrochrome alloy, which relates to a method for producing ferrochrome alloy by hot charging of chain grate-rotary kiln combined with metallized pellets. Background technique [0002] Chromium can increase the mechanical properties, wear resistance and high temperature resistance of steel, increase the quenching degree of steel and the deformation ability after quenching, and enhance the hardness, elasticity, antimagnetic, tension resistance, corrosion resistance and heat resistance of steel. In industrial production, in order to improve the corrosion resistance of steel, ferrochromium is usually added to ordinary carbon steel. Therefore, high-carbon ferrochromium is an indispensable additive in steel smelting and an important raw material for producing stainless steel. [0003] At present, the submerged arc furnace electric furnace method is the most commonly used method to produce ferrochromium alloy. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B4/06
Inventor 马云普
Owner HEBEI TAIHANG FOUND MINERAL RESOURCES CO LTD
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