NABC Chapter 225
Chapter 225
I heard that Qiyang actually wanted to mine here.
All of them were very happy.
After all, who doesn’t know, Qi Yang is now the God of Wealth.
Where to mine, where to send.
Therefore, Qi Yang wanted to go through those procedures, and quickly handled them.
Handling such a thing naturally does not need Qiyang to personally do it.
Take advantage of your subordinates to handle the formalities.
The boss of the other party said to Qi Yang.
“Mr. Qiyang, one of the main pillars of your company is the iron ore, I don’t know about this matter, plan?”
Hearing the other party’s words, Qi Yang was a little puzzled.
Could it be that in the past few days, what happened to the iron mine?
Impossible, if something really happened, he couldn’t bring no news now.
The other party’s expression when he looked at Qi Yang was also stunned.
Qi Yang didn’t seem to know about this yet.
So, he handed the journal at hand to Qi Yang.
Qi Yang’s gaze naturally fell on that thing.
This thing, you can know at a glance, it must have been made by Midi.
It looks as if iron ore and steel smelting are information.
This kind of periodical, as long as it is made by Midi, will have a large circulation.
And it’s also quite influential.
In the past two years, Qi Yang doesn’t know how many times he has been told by the so-called experts above.
“Those foreigners are doing things, making such small moves.”
After a brief look, I found that it was actually talking about pellets.
Pellets are a method of artificial lumpy raw materials.
It is a process that turns powdery materials into physical properties, and the chemical composition can meet the requirements of the next processing.
During the pelletizing process, the material not only undergoes physical properties due to rolling into balls and dense particles.
Such as density, porosity, shape, size, phase mechanical strength and other changes.
More important is the occurrence of chemical and physicochemical properties.
Such as chemical composition, reduction, expansion, high temperature reduction softening, low temperature reduction softening, melting and other ratios.
The metallurgical properties of the material are improved.
The basic task of pelletizing is not only to use concentrate and fine ore to make spherical smelting raw materials, but also to produce metallized pellets for direct reduction and apply them to comprehensive utilization and recovery of useful metals.
This is actually what polar metallurgy is doing.
They definitely want to grab resources this time.
It’s also a fight.
Pellets can be the main raw material for blast furnace ironmaking.
Whether it is their own production of discharge, energy saving and emission reduction of blast furnace ironmaking, as well as environmental protection and processing costs, pellets have great advantages over sinter.
Compared with sinter, the process energy consumption of pellets has great advantages, according to statistics in recent years, they are between 50~54%.
The energy consumption of belt roasted pellets is 50% lower than that of sinter ore in historical years, and 48.77% in 2015, indicating that pellet production has great advantages over sinter in terms of energy consumption.
Since the iron grade of pellets is 8~10 percentage points higher than that of sinter, it is obvious that the fuel ratio and increase production are reduced for blast furnace ironmaking.
At present, the main charge of blast furnace ironmaking in Europe and North America is not sinter, but pellet.
The blast furnace ironmaking dominated by pellets has high ore grade, low slag-iron ratio, low fuel ratio and high efficiency.
The advantages of pellets as the main raw material for blast furnace ironmaking and the value of pellets to the improvement of blast furnace indicators.
China’s iron ore resources are iron concentrate powder after multi-channel fine grinding and beneficiation.
Proper refinement is suitable for the production of high-grade pellets.
However, for nearly half a century, our Celestial Empire has been influenced by certain countries, taken the wrong path of mineral processing, and has been mainly producing sintered ore.
Steel production from energy saving, environmental protection and low cost, sintering and pellet production for a comprehensive economic analysis, can not show the price of tons of ore, to grasp the development direction of polar mining pellet production from the development trend of blast furnace charge structure in northern Europe and North American countries.
Starting from energy saving, environmental protection and low cost, steel production makes a comprehensive economic analysis of sintering and pellet production, and polar mining is indispensable for pelletizing ore.
Priority is given to the development of belt roaster pellets, belt roaster pellets have good development prospects.
Because the pellet production process does not have a complex dosing and raw material yard like sintering.
There is no need for one-mix and two-mix strengthening granulation, nor does it require segregation cloth and trolley air leakage process equipment and operation. There is also no need for a bulky ring cooling system.
The process equipment of pelletizing ore is simple, which not only saves a lot of construction investment, but also reduces production management costs.
According to statistics, in recent years, the processing fee of tons of balls is about half of the sintering processing fee.
Therefore, the development of pellet production is conducive to reducing the cost of iron smelting.
In fact, this kind of equipment has been established in polar mining, and it will not take long to put it into production.
There are three ways to roast pellets.
Shaft oven roasting, belt roasting, chain grate rotary kiln roasting.
The shaft furnace was the first pellet roasting equipment used.
Modern shaft furnaces have a drying bed at the top and a wind guide wall in the center of the roasting chamber.
The hot gases generated in the combustion chamber are sprayed into the roasting chamber from both sides and move towards the top,
The raw balls are evenly spread on the drying bed from the upper part and are dried and preheated by the rising hot gas,
Then slide down the slope of the drying bed into the roasting chamber to roast and consolidate, and after exiting the roasting chamber, meet the cold air blowing in from the bottom to get cooled.
Finally, the shaft furnace is discharged with a discharge machine.
The structure of the shaft furnace is simple, and there are no special requirements for the material.
The disadvantage is that the output of the single furnace is low, only suitable for the roasting of magnetic powder pellets, because the gas flow in the shaft furnace is difficult to control, the uneven roasting causes the quality of the pellets to be uneven.
The belt roaster is currently the most widely used roasting method.
Features of belt roasting.
Base and trimming are used to improve roasting quality while protecting the trolley and extending the life of the trolley.
A combination of blast and exhaust drying is used to improve the drying process and improve the quality of pellets.
Blow cooling pellets, directly using the hot air obtained from the cooling belt to fuel combustion in the roasting belt, and the drying belt are used.
Only exhaust gases with low temperature and high moisture content are discharged into the chimney.
It is suitable for a variety of different raw materials, such as hematite flotation powder, magnetite magnetic separation powder or mixed powder, and the roasting of pellets.
Qi Yang chose this kind of nature.
Moreover, it is also a system upgrade.
PS: Recently I had a bad cold, which is getting worse, and I am still in the hospital.
In the afternoon, due to the recent maintenance of the website, all authors will not be able to upload new chapters.
After three to five days, the site is back to normal, and I will make up the manuscripts from these days. _
Feilu reminds you: three things to read – favorites, recommendations