Alien Knights

　　 Around 6 o'clock in the evening.

After having dinner in a hurry, after thanking Master Miles for his generosity, Todd took a few white papers, a set of rulers, a few charcoal pens and half a candle he brought from the class, and buried one end of his own. The room started what he was best at in his previous life.

　　The design of chemical experiments and practical industrial applications.

　　 In the afternoon, by observing the waste **** extracted from the silver mine, and verifying with the craftsman Aiden, Todd has already had a certain number of plans for the next work.

The "Beishi Mine" mines and smelts silver ore. Although the "ash-blown silver method" is used, the royal craftsmen's understanding of mineral elements and chemical reactions is still at an early stage, and the silver in the ore is only refined about 60%. % To 70%, and about 30% of the silver was lost in the waste residue and was sent to the San Sidlo Monastery as rubbish.

　　 Why is there such a loss.

　　 is mainly because of three chemical substances: bismuth (Bi, atomic number 83), tellurium (Te, atomic number 52) and lead oxide (PbO).

Bismuth can form a 97.5% low melting point (262°C) eutectic with silver, and can also form a solid solution containing 5% bismuth with silver. During the ash blowing process, bismuth has been copolymerized with silver in the lead liquid, and the first stage of ash blowing is finished. After that, only the second stage of the extended operation can extract the silver liquid and oxidize the bismuth into bismuth trioxide into the slag.

　　 As for tellurium, it is not easy to be oxidized and precipitated during the ash blowing process due to its high affinity with silver and gold. In order to remove tellurium, in Europe at the end of the 16th century, lead-rich was usually added to the molten pool after bismuth was removed, so that the concentration of tellurium was reduced before ash blowing was continued. That is to carry out the third stage of the extension work, and after two more clean lead soot blowing, about one-third of the tellurium can be oxidized and volatilized, two-thirds of the tellurium is oxidized into the slag, and the remaining traces of tellurium are left in the silver In the liquid.

　　 There is also the last lead oxide. PbO solution can also dissolve a small amount of silver (3% to 6% of silver can be dissolved in PbO according to "Kolmeier Experiment") and silver oxide (Silver oxide is unstable and dissociates completely at 150°C. But it becomes quite stable when it forms an alloy with PbO), thereby reducing the recovery rate of silver. However, in the second and third phases of extended work, silver can be further extracted to reduce the loss caused by lead oxide.

The principle of 　　 is probably like this.

　　The key is how to rely on the existing equipment and materials on hand to carry out the secondary and tertiary refining of the silver ore waste residue.

　　 The electric furnace soot blowing method in the early 19th century is not to be thought of.

　　 The roulette-style soot blowing method at the end of the 17th century and the beginning of the 18th century was not possible at all.

　　 Even the high-tube ash-blowing furnace in the mid-16th century is difficult to realize under today's conditions.

　　In comparison, only the early covered ash-blowing furnace from the end of the 13th century and the beginning of the 14th century can barely be reproduced.

　　 While recalling the shape of the furnace in his mind, he used charcoal pencil and ruler to draw the refinement steps and the improvement of the utensils on the white paper.

　　 Todd, who was addicted to scientific research, quickly forgot the passage of time.

　　 Finally, the candle that burned to the end reminded him of his work and rest time.

　　 Looking at the half-completed blueprint in the dark, Todd held his forehead depressed. This feeling of being forced to stop after half the work was the most unbearable.

　　 penetrated the bricks and tiles above his head, he looked at the bright moon hanging high in the sky, sighed, and had no choice but to climb into bed and choose to sleep.

　　 Early morning the next day.

　　 Zhi Gengren's waist clock became the voice he didn't want to hear the most.

　　 But he also knew clearly that if he missed the morning class, he would not only cause unnecessary suspicion from others, but would even make himself unable to stay here.

　　 Strongly braced, put on a monk's clothes, rubbed his sore eyes, Todd carefully folded the drawings on the table and placed it under the bed board. Although the annotations on the drawings are in Chinese, and I believe no one has seen the chemical elements and equations, it is better to be cautious about this kind of things.

　　 hiding in the corner, yawning, and finishing the morning class with everyone, the boy has to rush to Master Miles to learn a new lesson.

　　 Grammar, rhetoric, logic, arithmetic, and geometry are acceptable to him. Music and astronomy really killed him.

　　 The music is relatively better. Firstly, he doesn't know how to do it. Secondly, he is not interested. The class is just a perfunctory pass.

　　Astronomy is the biggest trouble.

　　 Let a soul baptized by modern civilization to accept the education of church astronomy, let alone a teacher with a scientific background.

　　 I clearly yelled nonsense and nonsense in my head, and yelled that it was so, that I was taught.

In the 　　 teaching class, perhaps it was seen that Todd was in low spirits and low spirits. Master Myris rarely interrupted the course and talked with the apprentice opposite.

　　 "You are the most talented student I have ever seen."

　　 Hearing the old man sitting across from him, he wore himself a "high hat" when he came up, and Todd murmured in his heart that it was not good, and he put on a respectful appearance.

　　 "There is no doubt that Heavenly Father has given you blessings and blessings. If you calm down and devote yourself to practice, you may become the first of us to approach the existence of sages."

　　 The boy still lowered his head, vaguely feeling that the hat on his head was about to pierce the roof and pointed towards the sky.

"but…"

　　 licked his mouth, Todd touched the bridge of his nose with his fingers, and thought to himself, there really is a but.

　　 "Don't spend your time and energy on those trails."

　　 Edgar, you have a big mouth!

　　 Todd thought to himself: I guessed it, when talking about these nonsense topics today, it must be Edgar, the bastard, who reported yesterday's events to Master Miles.

　　 There are some unwilling boys who raised their heads and tentatively persuaded the old man: "Master, if I have a way, I can slightly improve everyone's lives. Isn't it possible to help everyone better understand the true meaning of the holy way?"

　　 "No! My child, this idea is not correct!"

　　 In Todd’s impression, UU reading www.uukanshu. This is the first time that Master Myris has such a serious look on his face. He only listens to him saying: "The expression of wanting to improve our lives is just an excuse for laziness and perdition. A comfortable life will wear down our will and slowness. Our minds are emptied of our bodies. The monks who are truly committed to the holy way should abandon all distractions and all vulgar things, and dedicate their life's spirit and life to the Father!"

　　 The corners of his eyes twitched, and the apprentice wanted to argue again, but after thinking about it carefully, he realized that this was definitely not a good idea. He quickly buried his head and closed his eyes to prevent the old man from seeing his questioning and dissatisfied expression.

　　After a long time, Todd suffocated a word from his throat.

　　 "I would like to follow the instructions of the teacher."

　　—————————

　　 After finishing the morning study, Todd walked out of the teaching class and felt that the world was gray.

　　 Obviously there are ways to eat exquisite food and put on brand-new clothes. You don’t have to work and run around in the dark every day, and you can devote more energy and time to research and academics.

　　 Why refuse to live like this?

　　 He couldn't understand.

　　 From the corner of his eye, he caught a glimpse of a figure appearing at the corner of the wall.

　　 Seeing clearly who the person is here, Todd was furious, taking off his shoes and holding them in his hands and rushing away, while swearing in his mouth: "Edgar, you little bastard! Let you tell the news about the bad old man!"

　　 Following the fleeing figure ahead, passing through several corridors and passing several corners, Todd headed into a man's arms.

　　 Huggins, who had been waiting for a long time, dragged Edgar behind him with a grimace, and said to Todd, "I heard you have a way to let us eat meat every day?"