"Boom!" The sound of cannons came from the front. The vegetation that should have been green was covered with scars everywhere, but it was not a question of destroying the environment, because the vegetation of the limestone mountains was not high, so it was difficult to form large areas of tall forests.

After mining the limestone, I have been recuperating for a few years and have been greening again. Quarrying is a work that has no pollution, but it is definitely a hard work.

"Captain Yang, how much is the price of a piece of stone?" Fang Dajun asked. A piece of stone is the local general term for various kinds of stones.

Yang Zhongjian thought about it and replied, "This is not accurate, it is calculated at about 10% of the cement price."

This means three to four yuan per ton, and the price is very low. However, limestone is exposed outside the mountain, which is much easier than digging coal and is also less dangerous. This price is also pretty good. As for this price, villagers are willing to mine and work.

The two of them did not stop and walked towards the quarry. The key to the cement technology today is the limestone. He asked again: "Whether the factory is going to pick up goods or the villagers send it to him themselves? Who will pay for the money for the firecrackers?"

"The factory will go to pick up the goods by itself, but the villagers will be responsible for loading the stone into the truck, and settle half of the money at the end of the month and half of the money at the end of the year. Sometimes the factory will also default on it, but it doesn't owe much." Yang Zhongjian replied a little embarrassedly. After all, the factory owes money on materials, which is a shameless thing.

After pausing, he said, "The artillery team is contacted by the factory, but the money is required to be paid by the villagers themselves. You will know when you go to the place. The commune of the mountain has been contracted out, and the large quarry is contracted by a brigade or a large family, so the artillery will be set off. There are also small families or individuals, so they will not fire artillery. They dig slowly by themselves, and they will contact the factory to pick up goods after digging a few tons."

It turned out to be this model. Fang Dajun thought about it and thought it was pretty good. After calculating the left and right, the factory was responsible for pulling goods and paying money. He didn't care about the rest. At most, he would contact the artillery team. This was just a slight effort.

When I arrived at the ground, I looked at the scene and found that there were all small limestones, almost all the big ones had been burned. Of course, after the firecrackers, the large stones below could be blown out.

As for the family system, it is to scatter on the surface of the hillside. One layer is scattered. When encountering large stones, it is decomposed by native methods. It did not delay here for long. Every commune has stonemasons and there is no shortage of people. Mining quarries is not a problem.

The required clay, which is not nearby, is transported from outside, undoubtedly increases the cost of the cement plant here.

The two followed the tractor and returned to the factory with the stone. Now they were going to crush the stone into small stone seeds, and then mixed them into sand, gravel, clay, etc. into powder. Add water when grinding them finely, otherwise the machinery and equipment would not be able to withstand it. He vaguely remembered that the cement in later generations should have been dry-ground. There was water mixed here, no wonder there would be thick smoke when calcined, and the calcination time was very long. This was because heating was needed to evaporate the water vapor at the beginning.

At the same time, coal crushing is also carried out. There are two parts of coal use: one is the ignition under the kiln to maintain firepower, which accounts for the majority, and the other is mixed into raw materials to calcinate. The value of coal is very high, only about 5,000 kcal. This kcal is a common heat unit in my country. The unit used to represent heat in the international unit is Joule, generally 4.1816 kcal = 1 joule!

Low-calorie coal cannot support the calcination temperature, which increases the cost of coal in disguise. However, Fang Dajun has the low-calorie coal selected by the honeycomb coal factory, so it doesn’t matter. Jiaoshan’s coal is low-thio, medium-low ash, high-calorie high-quality coal, and large-calorie value can withstand calcination consumption.

One ton of cement probably uses about 200KG of high-quality coal, and the cost of zero point two tons of coal is not high.

In addition, the cost of raw materials used is not high, of course, it depends on the local environment and prices.

According to Fang Dajun's calculations, the cost can even be reduced to less than ten yuan. Based on the average of 30 yuan per ton of cement, the profit of one ton can actually reach twenty yuan.

Of course, it is not possible to do production by theory alone. The specific profit will only be clear after specific operations. The profit of twenty yuan is only theoretical value.

At this time, after visiting the crushing and grinding raw materials, we will record the key points along the way, because each section may not be working just in time, so the process runs fast, and in terms of details, it is also recorded through Yang Zhongjian's explanation. He can finish the big process this afternoon, but it is estimated that it will take two or three days to figure it out thoroughly. Half a can of water will not work.

There is a detail here in grinding. The technician needs to mix various materials. It seems very simple, just compare the proportions. However, considering the current cultural level of the people, people who understand culture must come. Because once the proportion mixing error occurs, the kiln materials will be scrapped and the losses are huge.

Following him and Yang Zhongjian climbed up the towering kiln and visited the calcination process. This was a method of use, similar to the earth kiln that burned lime, but it was magnified many times. When burning lime, coal and limestone were stacked in layers, and this kiln used the coal laying method.

After laying raw materials of a certain thickness, lay a layer of crushed high-quality coal, and then laying raw materials, not mixing coal powder into the raw materials.

"Dajun, look here. After calcining, the materials are unloaded, and they are pulled to the opposite warehouse with a bucket truck. After it is cool, they are ground into powder. The technicians come to mix the materials and it is cement." Yang Zhongjian explained.

Fang Dajun nodded and looked at the truck. It was similar to the carts transporting materials on construction sites in later generations. The design principle was easier to pour out the goods. As for the warehouse of the cement factory, it could also be called a transit station, which was relatively simple, which was equivalent to a tiled piece on the rotten ground, and it would be OK if there was no leakage and it was very empty.

There are some materials inside that have not had time to calcinate and are condensed, but in fact the fine powder condenses into a pinch of pinch, which can easily be ground fine. This is clinker.

Finally, add the mixture that meets the requirements, namely slag, gypsum, etc. to the clinker. Fang Dajun chose the powder ground after calcining the coal gangue, because this can greatly save costs.

This is the general process, with two mills and one burning, and there is also crushing and crushing, and there is no refrigeration in the middle. Although he did not know the cement technology of later generations, he did not see smoke coming out when he was passing by the cement factory. He should have given the current civilized smoke exhaust to the best. Of course, he couldn't figure it out if he didn't understand this industry before, so he would do it according to the current conditions, haha.

He divided the steps according to the usual techniques used by factories in later generations and wrote them on the notebook.

1: Mining system

2: Raw material crushing system

3: Raw material homogenization and storage system

4: Raw material ingredients system

5: Raw material grinding system

6: Production homogenization and kiln entry system

7: Clinker calcination and cooling system

8: Clinker storage system

9: Cement ingredients and grinding system

10: Cement storage and shipping system.

There are generally ten steps, each step below is a number of key point annotations and process segmentation, as well as the required labor, etc.

He wrote very seriously, and Yang Zhongjian next to him also read it seriously. The content on the paper shocked Yang Zhongjian.

PS: I got home a little late. After having dinner, I will write a chapter immediately. I will ask for recommendation votes on Monday!
Chapter completed!