Combined production process for high-carbon ferro-chrome and semi-coke

A high-carbon ferrochromium, co-production technology, applied in the petroleum industry, special forms of dry distillation, furnace types, etc., can solve the problems of unutilized excess gas, ineffective and repeated transportation of coal resources, and reduced utilization of pyrolysis raw materials, etc. The effect of reducing smelting power consumption, reducing energy consumption and increasing production capacity

Active Publication Date: 2015-12-02
BERIS ENG & RES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large-scale mechanized fully mechanized mining is difficult to meet the requirements of the process for coal lumps, the ratio of lump coal after screening of raw coal is not high, and some pulverized coal ratios are greater than 60%
Therefore, many semi-coke factories sell a large number of small particles or pulverized coal <30mm under the sieve at a low price, which not only seriously affects the economic benefits of the enterprise, but also greatly reduces the utilization rate of pyrolysis raw materials, and also causes the ineffectiveness of this part of coal resources. Repeat shipping
[0015] In addition, there are still problems in the semi-coke industry: the surplus gas produced in the production of semi-coke has not been utilized, and many small semi-coke plants are only emptied and burned, which has caused a great waste of energy; Some semi-coke powder will also be produced, and the semi-coke powder cannot be smelted in an electric furnace, resulting in a waste of semi-coke resources

Method used

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  • Combined production process for high-carbon ferro-chrome and semi-coke
  • Combined production process for high-carbon ferro-chrome and semi-coke
  • Combined production process for high-carbon ferro-chrome and semi-coke

Examples

Experimental program
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Effect test

preparation example Construction

[0056] (2) Preparation of blue charcoal

[0057] Lump coal with a particle size of 30-80mm is sent into a carbonization furnace to produce semi-coke by pyrolysis and carbonization, wherein the temperature of pyrolysis and carbonization is 950-1100°C.

[0058] In the present invention, the carbonization furnace adopts an internal heating carbonization furnace, and the heat required by the carbonization furnace comes from the high-temperature flue gas of the rotary hearth furnace. The heat of the conventional internal heating carbonization furnace comes from the high-temperature flue gas generated by the combustion of a large amount of returned furnace gas. Conventional internal heating carbonization furnaces generally use air to support combustion, and the N in the flue gas after combustion 2 The volume fraction is about 70%, so the nitrogen content in the final semi-coke tail gas is relatively high (N 2 The volume fraction is about 40%). Because nitrogen is an inert gas, th...

Embodiment

[0105] The implementation of the method and the use of the equipment of the present invention will be described below through specific examples. It should be understood by those skilled in the art that this should not be construed as limiting the scope of the claims of the present invention. Example

[0106] The low metamorphic coal used in this example is long-flame coal, and both long-flame coal and ferrochrome fine ore are conventional commercially available raw materials, and their chemical compositions are shown in Table 6 and Table 7, respectively, and the percentages are by weight.

[0107] Table 6 Chemical composition of long flame coal

[0108] Element

moisture

Ash

Volatile matter

fixed carbon

Total sulfur

％

3.7

5.8

35.7

54.4

0.4

[0109] Table 7 Chemical composition of chromite fine ore

[0110] name

Cr 2 o 3

FeO

SiO 2

Al 2 o 3

MgO

CaO

h 2 o

P

...

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Abstract

The invention provides a combined production process for high-carbon ferro-chrome and semi-coke. The combined production process for the high-carbon ferro-chrome and the semi-coke comprises the steps that coal and ferro-chrome fine ore are prepared and used as raw materials; lump coal is subjected to pyrolysis and carbonization to obtain the semi-coke; the ferro-chrome fine ore, pulverized coal and semi-coke powder are ground in a mixed mode, and adhesives and water are added to obtain green pellets; the green pellets are arranged in a rotary hearth furnace to be subjected to high-temperature roasting and reduction, and the reduced pellets are obtained; and the reduced pellets are cooled, mixed with lump semi-coke and flux, and then added into a closed electric furnace to be smelted, and high-carbon ferro-chrome producted are obtained. During the process, the electricity consumption for smelting of the electric furnace is 2400 kw*h / t.

Description

technical field [0001] The invention relates to the field of ferroalloy and semi-coke production, in particular to a combined production process of high-carbon ferrochromium and semi-coke. Background technique [0002] Chromite ore is an important raw material for ferroalloy production of high-carbon ferrochrome, of which lump ore accounts for about 20% of the total, and the rest is fine ore. With the consumption of high-quality natural lump ore resources, cheaper fine ore has become the main raw material for ferrochrome smelting. According to the existing technology, fine ore raw materials cannot be completely directly smelted in the furnace, otherwise the air permeability of the electric furnace will be deteriorated, the furnace condition will be deteriorated, and the energy consumption will be increased, so the fine ore must be pretreated. At present, the pretreatment technologies of ferrochrome fine ore mainly include sintering, cold pressing and pelletizing. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B4/06C21B13/10C10B53/00C10B57/04
Inventor 王惠永李谦
Owner BERIS ENG & RES CORP
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