Hand rubbing nuclear fusion live in the wilderness

Chapter 353 Problems with Resource Collection Tasks

Listing all the way down, Han Yuan found that in the past few years, in fact, almost all of the top ranked elements on the periodic table have been collected.

The latter are basically rare metal materials that are relatively difficult to see, such as rubidium, strontium, and uranium.

These materials have not been used in the past time, even if the relevant mineral deposits were discovered, he did not collect them.

Even if some special alloys require these metals, there are other alloy materials in his mind that can be replaced, and he does not specify that these things are necessarily required.

After thinking about it, Han Yuan calculated again. Judging from the demand for materials over the years, he has indeed collected a lot of materials.

Especially for metal materials, for the sake of industrial development, he also went out to search for them several times with metal mineral detectors.

Although there is knowledge and information on primary material smelting in mind, even if many special alloys have replacement materials, alloy materials still need corresponding metals to be smelted.

It seems that the goal of resource collection in the future will mainly focus on rare metals.

After listing out the individual materials collected and used before, Han Yuan stared at the white paper and couldn't help but frown.

According to the comparison between the elemental materials he listed and the periodic table of elements, there is a problem with the progress of the resource collection task.

After staring at the black writing on the paper for a while, Han Yuan reopened the task information panel.

[Starlink mission branch chain mission [-]: Resource collection]

"Resource collection Starlink mission requirements: Collect more than 50.00% of the original ecological elements on the current planet in two years and smelt and synthesize three unnatural elements."

"Current element collection accounts for 26.73% of the resource collection task, and the smelting progress of the three unnatural elements is 0/3."

Judging from the task progress provided by the system, his current element collection ratio is 26.73%.

There are 118 elements in the periodic table.

Of course, there are a lot of low-ranking elements in this, which is actually a class.

In addition, most materials have their isotopes. For example, uranium has many isotopes. The natural isotopes include uranium-234, uranium-235, and uranium-238.

In addition, there are more than a dozen artificial isotopes of uranium.

Thinking of this, Han Yuan suddenly realized something that might be cheating.

Don't tell him, the resource collection mentioned by this system is to collect isotopes of all natural elements?

If so, that's a pain in the ass.

Starting from human research elements, up to now, 118 elements have been discovered.

Only 20 of these elements have no stable isotopes found.

All elements have radioactive isotopes.

If isotopes are all considered elements, this is really cheating.

But immediately, Han Yuan felt that he was wrong. If all the isotopes were included, the resource collection ratio would never reach 20.00%.

Because there are many isotopes of radioactive elements at the back of the periodic table, if all the isotopes of the 118 elements are counted, the number is more than [-].

Even the isotopes that exist in nature have hundreds of species.

In addition, if isotopes are counted, there are such things as allotropes in nature.

For example, the famous ozone, which is an allotrope of oxygen, or white phosphorus and red phosphorus, which are also allotropes.

According to this idea, the various elements that need to be collected in this resource collection mission are at least four digits or more.

But obviously, that's not practical.

Because up to now, the various elements he has collected and manufactured add up to 67 kinds.

If calculated according to the 118 elements on the periodic table, this already meets the requirements of 50.00% of the resource collection task.

But calculated according to the rule that both isotopes and allotropes are counted, this is far from the percentage of 20.00%.

So here is the problem. I don't know which link went wrong at this time, which caused the percentage to be stuck at the strange number of 26.

"There must be something in the middle that I don't know."

Han Yuan touched his chin and muttered.

There are 67 elements, more than half of the periodic table of elements.

"Could it be a single quality problem?"

Suddenly, Han Yuan thought of a possibility.

In the past few years, although he has indeed collected many types of elements, except for metals, many other things are not collected in the form of simple substances.

Looking back, many things, such as sulfur, carbon, oxygen, and hydrogen, basically exist in the form of compounds in his hands.

Some things may be monomers, but in terms of purity, may not meet the requirements of this system?
After pondering for a while, Han Yuan felt that this was indeed possible.

Possibly only single elements are counted towards resource collection quest progress by this system.

"Gold, Silver, Copper, Iron, Aluminum, Chromium, Titanium, Nickel"

Looking at the records on the paper, Han Yuan quickly selected and processed the high-purity elemental materials that he had clearly smelted.

Among these materials, he has smelted all metal materials and has stored materials in the storage room.

Mainly to facilitate the smelting of various alloys.

After all, the amount spent exchanging technology points for raw materials and exchanging processed alloy materials is not at the same level at all.

Of course, not only various elemental metals are stored in the storage room.

Alloys, non-metallic materials, wooden materials, liquid materials, etc. are all available.

The storage room that was originally set up between the chemistry laboratory and the physics laboratory has long been relocated.

Now, various raw materials are stored, which is a combination of steel bar workshop and concrete room covering a large area.

It was built by chimpanzees and bonobos.

Some materials that are not so demanding on the preservation environment are stored in the steel bar factory, while the concrete room with air conditioning and ventilation equipment is used to store materials that have higher requirements on the preservation environment.

Developed to the present, although he is only a person, the requirements for materials are indeed no weaker than that of a civilization.

Although he has many materials that can replace each other, for example, CFA copper-iron alloy can replace most copper-iron alloys.

But even if it can be replaced, it still needs the most basic raw materials.

Fortunately, where he is now, there is a volcanic vein under his feet, which has formed a variety of metal mines. Although they are not large, they are enough for him.

After all, with the assistance of the mall and technology points, he only needs a little raw material.

After calculating the statistics of the elemental elements that have been smelted before, Han Yuan suddenly understood.

The judgment of this system for the task of 'resource collection' is based on simple elements.

And this elemental element should mean that the purity of the elemental element must reach a level, such as 90.00% nine, or 90.00% nine point nine.

Of course, this is only a speculation at present, and whether this is the case still needs to be verified experimentally.

After thinking about it, Won picked out an element.

"calcium"

Calcium is a metal element with an atomic number of 20 and a symbol Ca, which is located in the 4th period and group IIA of the periodic table.

'Calcium' is a silver-white solid at room temperature, and its chemical properties are very active, so it mostly exists in the form of ions or compounds in nature.

This element Korean won is rarely used, whether it is smelting of alloy materials or chemical experiments, basically it has not been used much, and elemental calcium materials have not been smelted.

Han Yuan set his target on the element 'calcium'. He planned to extract some elemental calcium through the chemical laboratory, and then see if the percentage progress of the 'resource collection' task has changed.

For him today, extracting elemental calcium is no longer a big deal.

Whether it is electrolysis or aluminothermic reduction, there are sufficient equipment and conditions to do it.

After thinking for a second, Han Yuan decided on the method of smelting elemental calcium this time.

"Electrolytic Cathodic Deposition".

The calcium metal smelted in this way has a high purity, which can reach more than 90.00%, which should meet the task requirements.

After confirming the needs, Han Yuan cleared the table and headed to the chemical laboratory.

It is easy to extract metallic calcium by electrowinning, especially when he has complete equipment and materials.

High-purity metallic calcium can be obtained by electrolyzing molten calcium chloride at a high temperature of 780-800°C.

The electrolytic cell generally uses graphite as the smelting crucible, the anode uses graphite, and the iron rod or graphite rod is used as the cathode, and then it is enough to keep the current density passing through the cathode at 100A/cm2.

As the electrolysis process proceeds, calcium chloride will decompose, and the precipitation of metallic calcium will gradually increase the concentration of calcium ions in the cathode, and then cover the cathode with a layer of metallic calcium.

The decomposed chlorine gas will be discharged.

The only difficulty in the entire process is the control of the current density through the cathode.

This is the biggest difficulty, but for Won, it is not difficult to control the current density passing through the cathode at 100A/cm2 when there is a current control meter and a lithium-sulfur battery with high energy storage.

Over time, the electrolyzed calcium metal in the electrolytic cell will be covered with a layer of molten calcium chloride material that has solidified in the air.

This layer of material is very important. It can prevent the metal calcium accumulated in the cathode from electrolysis from being oxidized in the air, which is the key point to ensure the purity of the electrolytic extraction of calcium metal.

The purity of calcium metal obtained in this way can reach more than 90.00%, and the impurities are iron, silicon, aluminum, traces of carbon and some chlorine.

These are some of the impurities inherent in the calcium chloride material.

If the calcium chloride supersaturated solution is used to further purify the electrolyzed calcium chloride, the purity of the calcium metal extracted by this electrolytic method will be higher.

Although the process in advance is more complicated, in order to ensure that the purity of the smelted calcium metal can meet the requirements of the resource collection task, Won still carried out a purification process on the calcium chloride first.

It takes a certain amount of time to extract metallic calcium by electrolytic cathodic deposition. After all, it needs to electrolyze calcium chloride into chlorine gas and metallic calcium ions.

Then metal calcium ions will slowly deposit on the cathode, and it is inevitable that this process will take time.

However, Won did not wait for a long time. After about half an hour, a layer of metallic calcium was deposited on the cathode, and the electrolysis process was stopped.

This is enough for him.

No matter how much calcium metal is in his hand, as long as he can smelt and process it, then it meets the requirements in the judgment of this system.

After peeling off a thin layer of calcium metal attached to the cathode, Han Yuan reopened the mission information panel.

[Starlink mission branch chain mission [-]: Resource collection]

"Resource collection Starlink mission requirements: Collect more than 50.00% of the original ecological elements on the current planet in two years and smelt and synthesize three unnatural elements."

"The current resource collection task accounts for 27.18% of element collection, and the smelting progress of three unnatural elements is 0/3."

Sure enough, the schedule changed.

The task information panel unfolded, and Won could see the progress of the resource collection task at a glance, from the previous 26.73% to 27.18%.

The elemental calcium metal was extracted, and the progress of the task was advanced by [-] to close to [-].

Calculated according to this progress, his previous speculation was correct.

The resource collection task's judgment requirements for elements are judged based on the acquisition of its elemental quality.

In this case, the subsequent work will be handled easily.

It is only necessary to extract some of the various simple substances on the periodic table of elements.

This is not difficult for him.

Especially atmospheric fractionation can provide him with a lot of simple elements.

The normal atmosphere contains nitrogen, oxygen, helium, neon, argon, krypton, xenon, radon and other gases.

And these gases can be separated, collected and purified through different distillation points.

After the purification is completed, the requirements of the system can be met.

These gas elements are all that Won has not refined before, and one refinement can add a lot of percentage progress to the resource collection task.

Fractional distillation of various gases from the air is not a difficult task, and countries with industrial bases can do it.

The Korean won has also fractionated xenon from the air by technical means before.

It is not difficult for him to fractionate the air again these days.

There are many relatively mature technologies for separating various gases from air, among which the 'low temperature distillation' is widely used.

First, a large amount of air is collected by an air compressor, and then sent to a filter, where dust, floating objects and other impurities in the air are filtered out.

After filtering out impurities such as dust and floating objects, the gas is sent to the compressor to be compressed.

The compressed air is cooled to about 10°C and passed through a series of filters to remove moisture, oil, water vapor and other contaminants.

After two filtration procedures, the resulting high-purity gaseous air enters the expansion engine through a heat exchanger.

The rapid expansion of the compressed gas inside the engine lowers its temperature below its freezing point, which is about -1°C for air at 195.8 atmosphere of pressure.

The air lowered to the freezing point will be liquefied. Once liquefied, it can be passed through the fractionation device to control the low temperature, and then the various gases in the liquefied air will be fractionated step by step.

For example, the boiling point of nitrogen is minus 196 degrees Celsius; for example, the boiling point of oxygen is minus 183 degrees Celsius, such as the boiling point of argon is minus 185.7 degrees Celsius.

(End of this chapter)