Rebirth before the doomsday: I quietly emptied the city of supplies

Because the amount of sales crystals condensed on the surface is not large, although it is easy to collect, more of them still need to be extracted from soil blocks rich in saltpeter.

After putting on his equipment, Chen Yu quickly arrived at the seaside, the saline-alkali area of ​​Beijing. As he expected, there were a large number of saltpeter crystals condensed on the surface.

Chen Yu collected some and looked at them carefully. He found that the purity of these saltpeter crystals was much higher than those near Bihu Lake.

To put it simply, the purity of saltpeter means better quality. For the same amount of saltpeter, the products made with higher purity will of course be more popular. Chen Yu looked for the place where the most crystals were precipitated on the surface, dug up the hard soil with a hoe, and then shoveled it into the back with a shovel. After more than an hour of hard work, Chen Yu collected a large area of ​​soil containing saltpeter.

Also because the saltpeter content in these soils is very high, Chen Yu did not go to other places to collect it. This piece of saline-alkali land alone is enough for Chen Yu to collect.

A large load of soil weighs about 200 kilograms. Although these things are not very heavy.

But Chen Yu still habitually put it into the system space, and only took it out and carried it on his back when he was about to return to the shelter. After all, who would choose to suffer when there is an easier way? In just over an hour, Chen Yu returned to the shelter. He chopped wood and lit a fire, and set up a big pot to filter saltpeter and sulfur!

The process of filtering sulfur is relatively complicated. It requires placing the soil containing sulfur in a pot and heating it, stirring it constantly. After the temperature reaches a certain level and the water evaporates, continue heating until the sulfur vaporizes into sulfur gas under high temperature. Finally, collect the sulfur gas, and after it solidifies, you can get sulfur with relatively high purity!

Because sulfur has a higher boiling point than water, it needs a higher temperature to evaporate, and special condensation equipment is needed here. For this reason, Chen Yu also made a large pot lid to cover the pot and increase the water temperature and pressure.

This big pot cover was cut from a whole piece of wood. In order to prevent leakage, Chen Yu did not even piece together the wood, but used it as a whole. In the middle of the wood, there was a small hole the size of a ping-pong ball. This was the air hole that Chen Yu was going to use to condense the sulfur gas.

When the water boils and the moisture inside gradually evaporates and the temperature continues to rise, you can cover the pot, insert the bamboo pole with the nodes pierced through and bent, and wait for the sulfur water to flow out.

Everything went very smoothly. As Chen Yu continued to operate, the sulfur gas slowly flowed out of the bamboo tube. When it just reached the exit of the bamboo tube, Chen Yu blocked it from above with a few banana leaves.

The gas quickly solidified on the banana leaves when it was cooled, forming a thick layer of egg-yolk-colored sulfur solids. Although it went smoothly, the process was slow because the condensed sulfur was of high purity, so the amount was much reduced.

After purifying all the broken pieces of soil with sulfur on them, Chen Yu finally got some of the few pure sulfur. For this reason, Chen Yu thought that there might be sulfur in the soil that had not been purified, so he added water and boiled it again.

Sure enough, the second purification yielded a considerable amount of sulfur. Although it was already a lot, it was still a little less than what he needed. Therefore, Chen Yu ran to the beach twice more and continued to purify and process it, and only then did he get enough sulfur.

By the time Chen Yu had gathered enough sulfur, it was already getting dark. All this was done with the help of Ling Qing. Otherwise, if he only relied on Chen Yu's efficiency, he might not be able to finish refining all the sulfur before dark. While it was still light, Chen Yu planned to refine saltpeter as well. Compared with purifying sulfur, purifying saltpeter was much simpler.

All you need to do is grind all the saltpeter that Chen Yu found in the morning into powder, pour it into boiling water, filter it, and finally wait for the filtered water to condense to get saltpeter.

It's easier said than done, but it's not easy to do in practice. Grinding the soil and rocks is not an easy task...

It was not until after dark that Chen Yu ground all the soil and rocks into powder, because the smaller the filtered saltpeter blocks were, the greater the amount of saltpeter would be obtained.

It seemed that all the work could not be completed today, so Chen Yu did not force it. He packed up the purified sulfur and put it away. He also put the ground saltpeter soil back into the house to avoid any accidents.

The viewers in the live broadcast room saw Chen Yu working outside for a long time and didn't understand what he was doing. "What is the master doing? Is he hungry because he has no food?"

"Fuck, if you're hungry, would you eat rocks and mud? Where did this idiot come from!" "Look at him, it seems like he's refining something! But I don't understand!" "Oh my god, what he condensed is sulfur! I've seen this thing, it's sulfur!" Just when Chen Yu was refining sulfur, some sharp-eyed netizens discovered the clue. "Sulfur? What is this thing for? I need some scientific knowledge from a top student!"

"Well, sulfur has a wide range of uses, from various medical drugs to fireworks and firecrackers!" "Silly boy, don't you bring sulfur powder when you go camping? It's for repelling snakes!"

"I see! I've learned something new!"

……

Because Chen Yu had his own things to do today, he didn't give any special explanations, and Ling Qing didn't say much either, just smiled and greeted the drone when it came over, then went into the house to do his own things.

Therefore, until dark, the live broadcast room was still speculating about Chen Yu's purpose in refining sulfur.

"I think it's probably because he's sick, because there are some more obscure diseases that can only be cured by sulfur ointment, you know [smirk]" "Disgusting upstairs, don't use your experience to judge others!"

"I am used to make explosives. You know, sulfur is an essential ingredient for making explosives!" "I think so too. Chen Yu should want to use explosives to mine stones or open roads!"

……

Because Chen Yu did not filter out the saltpeter before dark, the audience in the live broadcast room argued for a long time without any result.

Because he was worried that She Er would become resentful, Chen Yu quickly started to refine saltpeter the next day after getting up. The soil had been crushed yesterday, so today he only needed to filter out the impurities and wait for the saltpeter to precipitate. Due to time constraints, Chen Yu did not wait for the saltpeter to filter out slowly.

Instead, they used the temperature coagulation method, pouring the soil containing saltpeter into boiling water, and then heating it to maintain a constant temperature.

After all the soil was added, use a homemade colander to filter out the soil and other impurities, leaving only a pot of turbid water.