A kind of sintering process of ferrochrome fine ore
A technology of ferrochrome powder and chromite powder, which is applied in the field of sintering process of chromite powder ore, can solve the problems of increasing the steps of sintering process, large energy consumption of grinding equipment, and reducing process efficiency, so as to improve the utilization factor, sintering combustion, etc. The effect of reduced consumption and simple process flow
Active Publication Date: 2018-02-13
BERIS ENG & RES CORP
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Problems solved by technology
The pellets produced by the two are suitable for smelting in closed electric furnaces, but both pelletizing methods require that the powder mass fraction of ferrochrome powder ore with a grinding particle size of ≤0.074mm (200 mesh) is ~80%, so the process equipment includes Large grinding equipment, the grinding equipment consumes a lot of energy
In addition, the two processes of pre-reduction pelletization and oxidation pelletization are complicated, and compared with the sintering method, the investment is huge
[0005] The patent application "a sintering process of chromite ore powder" with the authorized notification number CN101705356B discloses a sintering process of chromite ore powder, but the process plan needs to grind all the raw materials, especially the fine grinding of the ore powder to -0.074mm> 65%, so the steps of the sintering process are increased, and at the same time, because the grinding machine needs to be used, the process cost is increased and the process efficiency is reduced
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[0016] In order to better understand the sintering process of ferrochrome fine ore in the present invention, a specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings and actual working conditions.
[0017] The following are the different results of one kind of ferrochrome fine ore under different sintering processes:
[0018] The taste of a certain ferrochrome powder ore is 42%Cr 2 O 3 , Moisture content 2 h), the yield rate was 67%.
[0019] Adopt sintering process of the present invention, concrete steps are as follows:
[0020] Firstly, the raw materials are sieved to obtain a fine powder with a particle size of -0.125mm (accounting for 20%), and the remaining raw materials are used as coarse powder.
[0021] Then, mix the fine powder, coke powder and binder, wherein the coke powder particle size is less than 0.2mm, and mix them evenly in the wheel mill. While mixing the raw meal, add water to moisten ...
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Abstract
The invention provides a sintering process of ferrochrome powder ore. The working process is to sieve coarse powder and fine powder, then cold-press the fine powder into balls, mix the coarse powder, and then mix the coarse powder and fine powder together. Carry out sintering and screening, and adopt oxygen-enriched sintering technology. After adopting this sintering process method, there is no need for fine grinding of ferrochrome powder ore. Compared with the pellet method, the process flow is simpler, the overall water consumption of the scheme is smaller, and the sintering fuel consumption is correspondingly reduced; the sintering production capacity and sintering ore yield are improved.
Description
technical field [0001] The invention relates to a sintering process in the technical field of ferroalloy smelting, in particular to a sintering process of ferrochrome powder ore. Background technique [0002] Chromite is an important raw material for the production of high carbon ferrochrome from ferroalloys. At present, lump ore in chromite ore accounts for about 20%, powder ore (<8mm) accounts for about 80%, and it is relatively cheap. [0003] When the closed electric furnace is used to smelt ferrochrome fine ore, it is necessary to pretreat the ferrochrome fine ore, otherwise the air permeability of the electric furnace will be deteriorated, the furnace condition will be deteriorated, the energy consumption will be increased, and the operation safety of the electric furnace will be threatened. At present, the pretreatment technologies for ferrochrome powder ore suitable for closed electric furnace smelting mainly include sintering method and pellet roasting method. ...
Claims
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IPC IPC(8): C22B1/16
Inventor 王惠永吕韬李谦
Owner BERIS ENG & RES CORP