After the purification of raw materials is completed, the next steps are crushing, mixing, pressing, drying and other processes. **There are two forms, one is powdered and the other is granular, and gunpowder used to make fuses and other gunpowders is in powder form, and gunpowder with explosive power is all in granular form. Due to the gaps between the particles, granular gunpowder can be ignited quickly after ignition, releasing a large amount of chemical energy. The smaller, more uniform and denser the particles, the more powerful the explosion of gunpowder will be.

Theoretically, but in practice, Liu Yin found that it was very difficult, after all, there was no experience to follow, but fortunately, Liu Yin had read Qi Jiguang's "New Book of Succession" in the Ming Dynasty before, and remembered the gunpowder granulation method contained in it. It is to mix the sulfur charcoal in proportion and pound it many times repeatedly to make it fine. Add an appropriate amount of water or shochu to a second pound to make a puree. After drying, the finished granular gunpowder can be obtained by crushing and sieving, and the gunpowder obtained is also used in different firearms with different sieve hole sizes.

The crushing uses a large stone mill, pulled by a horse or mule, and the purified sulfur, saltpeter and paulownia charcoal are finely ground into powder with a stone mill, and after screening and processing, three powdered raw materials are sent to the mixing room.

In the mixing room, the three ingredients are mixed together in strict proportions, and the powdered gunpowder, which is used as a fuse and fuse, is sent directly to the drying room for drying. The granulated gunpowder is mixed with a certain amount of alcohol, mixed into a paste, dried in the shade, and then sent to the stone mill again. The secondary processing of the stone mill is different from the primary crushing of the stone mill, the first crushed stone mill is smooth and flat, and the secondary stone mill has a groove engraved with a thread on the mill, and through rolling, you can get relatively dense particles. Finally, through screening, the finished particles of the same size will be selected, and the unqualified particles will be sent back to the stone mill for processing again.

High-purity alcohol has less water content, not to mention that alcohol itself is also a flammable substance, Liu Yin did not choose to mix with water and chose high-purity alcohol, which can greatly reduce the water content of gunpowder.

However, it is not easy to obtain alcohol, and the rice wine that people drank in the Han Dynasty was fermented wine, which was relatively turbid and had a relatively low degree, and it was not a problem for good drinkers to drink one stone at a time. If you want to obtain high-purity alcohol, you must use distillation to make liquor, Liu Yin transformed the wine-making method, created a clear and transparent distilled spirit, and purified it twice, reaching more than 70 degrees, such alcohol is barely qualified.

Once Zhang Le inadvertently came to the winemaking room, smelled the wine intoxicating, couldn't help scooping a scoop to taste, although the wine he drank was not purified twice, but it was also close to fifty degrees of puree, Zhang Le only regarded it as an ordinary liquor, ate it refreshingly, drank a drunk, and woke up drunk for a day.

Afterwards, Zhang Le was secretly surprised, and said to Liu Yin: "Big brother, what kind of wine are you making, the stamina is so great, I don't get drunk in a thousand cups on weekdays, and I get drunk unconscious after only drinking a scoop of your wine." ”

Liu Yin couldn't help but smile bitterly, this is a high-grade liquor, can it be very different from the current low-alcohol rice wine?

However, Zhang Le was still unsatisfied, and praised Liu Yin for making the best wine in the world, if it was produced in large quantities, it would be really rich.

In this regard, Liu Yin is noncommittal, if he catches up with the peaceful and prosperous times, this is a good way to get rich, but at the beginning of the troubled times, his life is almost unsaved, and he goes to make wine, isn't it full of food? The top priority now is to drum out the gunpowder, so that in the Yinping resistance battle, he can have a few more chances of winning.

The final process is drying, which is also the most critical step in the production of gunpowder, dampness is the fatal problem of gunpowder, and it is almost impossible for damp gunpowder to ignite. The drying room is very narrow and long, with hollow sandwich walls on both sides, ten fire channels on the left and right, and vents at the top, and six large round holes dug on the left and right walls, for which Liu Yin designed a hand-cranked fan. After the fire, the temperature of the drying room can be raised to more than 60 degrees, and with the effect of the hand fan, the granular gunpowder sent to the drying room can quickly reach the required degree of dryness.

At the end of the drying room, there is the packing room, and the dried granular gunpowder is loaded into a special wooden barrel, the inner wall of the barrel is pasted with oiled paper, and the bottom is placed with quicklime, so that it can effectively prevent moisture.

Even if the production of gunpowder is placed in the future, it is also a high-risk industry, a little careless, can cause a devastating accident, Liu Yin founded the gunpowder workshop at the beginning, put safety production in the first place, formulated the ten major procedures for safe production, and required all craftsmen to fully comply with the production procedures.

In each production room, in addition to the craftsmen, Liu Yin also appointed a number of management personnel, served by the family members of the Anping Palace, to inspect back and forth, once found that the operation did not comply with the procedures, he was immediately punished severely.

In terms of safety production, Liu Yin will never be tolerant, and the consequences of any point of paralysis and carelessness are immeasurable, because he knows very well that gunpowder production is by no means child's play, and craftsmen will not take his life if they are whipped a few times, but once an accident occurs, not only the craftsmen who committed the crime, but even the craftsmen in the entire operation room will be wiped out, and for the safety of their lives, the iron-fisted policy is inevitable.

However, fortunately, these craftsmen have a low status, most of them are obedient, and the strict management measures have not caused them discomfort, and they will not have any dissatisfaction, under the intimidation, in order to prevent themselves from being punished, each craftsman does not dare to be lucky, and strictly follow the operating procedures.

More than ten days later, the first batch of granular gunpowder was produced, and Liu Yin grabbed a handful in his hand, feeling so excited. From today onwards, a new page will be opened in the history of human warfare, the appearance of gunpowder will be six centuries earlier than the original history, the pattern of human warfare will be turned upside down, the era of cold weapons will gradually come to an end, and thermal weapons represented by gunpowder will appear on the stage of history.

From the unconscious invention of gunpowder in the previous history to the conscious application of gunpowder today, gunpowder will soon be well-known to the world and bring a strong shock to the world, this may be a Pandora's box, even Liu Yin can not predict how much human society will change because of this, it will bring blessings or disasters to mankind, but standing at the node of history, Liu Yin has no choice.