Sea salt, also known as big salt, as early as the Yandi Shennong era, Su Sha began to "boil the sea for salt", in later generations, China's sea salt production is about 20 million tons, more than twice the salt production, is one of the world's largest salt production countries.

Of course, this is not to say that sea salt is inedible, but because there are too many minerals and impurities in sea salt, especially under the almost endless marine pollution, the sea salt directly dried will exceed 550 microplastic particles per kilogram of light, so the salt factories in later generations will further purify and refine the sea salt into table salt.

But in this era, the sea is still pure, not to mention plastic particles, and there are not even a few boats.

Ma Qiang and his entourage came to a bay, Ma Qiang pointed to the sea and said, "The sea water is inexhaustible, which of you can tell me why boiling water for salt is so depleted?" So much so that it costs 600 dollars a stone? ”

The Haoqiang in the back looked at each other, and then elected an old man, who was dressed frugally and had many calluses on his hands, and he didn't look like a Haoqiang family owner, but like an old farmer.

"Old decay Lu Zhong, if you return to the envoy, although this sea water does not cost money, it costs money to contain firewood.

There are 100 stones in the sea, but the salt is only three or four stones, and the seawater rots, and all kinds of utensils are greatly consumed! In addition, the bitter brine cannot be eaten, and the skilled craftsman needs to watch the heat, otherwise the whole kettle will be wasted, so although it is beneficial to boil salt, it is not much. ”

After speaking, Lu Zhong glanced at Ma Qiang, and hurriedly lowered his head.

I believe in your ghosts!

Ma Qiang rolled his eyes.

Saying that selling salt is not profitable is the same as saying that banks are a vulnerable group in later generations, who do you want to laugh at to death!

But Lu Zhong is right when he says something, that is, boiling salt does consume a lot, and there is also bitter brine.

In "The White-Haired Girl", which Diao Chan was touring everywhere at this time, Yang Bailao died of drinking brine.

This brine is bitter brine, chemically speaking, its main ingredient is magnesium chloride, there is also a part of potassium chloride, so the taste is bitter and salty, potassium chloride is good, magnesium chloride is a cheap poison for people, magnesium chloride can make protein coagulation, so when making tofu, it will rely on it to make tofu coagulate, but if people eat a large amount, the blood will coagulate and die, as the so-called rich people commit suicide to eat arsenic, poor people commit suicide to drink brine, each has its own way of death.

But don't dare to eat tofu because of this, after all, it's a hooligan to talk about toxicity without talking about dosage... What is this dose, according to the rat oral is 2.8 g/kg, the magnesium chloride content in tofu is far from reaching the harmful dose to people, so everyone can still eat tofu with peace of mind (not to say human!). ）。

At the same time, magnesium chloride is also an important raw material for magnesium fertilizer, but unfortunately, magnesium fertilizer is mainly used in acidic land, and most of the land in China is alkaline, so Ma Qiang has no need to point this scientific and technological point.

Therefore, when boiling sea salt, we must pay attention to removing the bitter salt, otherwise the taste is not bad, and the bitter salt will be killed if it is eaten.

"This is the new salt farm that I organized." Ma Qiang pointed to a field-like place in the distance and said, "Those are called salt pans, which use the beach drying method, using the sun to dry the seawater, and then produce salt, so that there is no need for fuelwood, so that the cost of salt production is greatly reduced, and the output is greatly increased." ”

"Salt?" Lu Zhong and the others walked to the front and looked at a set of salt pans that had just been repaired.

"Yes, let's go, let's go down, I'll introduce you, Jin Yun, come over for a while!"

A young man who was directing the workers to trim the salt pans ran over when he heard the noise.

"Let me introduce, Jin Yun, a native of Shanggu County, Youzhou, can be regarded as one of my students, and is currently the director of the Donglai Salt Farm."

Ma Qiang scraped his pockets, he didn't think of any suitable candidates, so he simply called Jin Yun and others, who had been recruited in the Red Star Camp in the past to be assistants to Yan Fa and others, to become big.

Because of staying in the laboratory for a long time, Jin Yun's skin was very white, and he was a little shy even talking to everyone, and he looked like a fledgling scholar, and he couldn't help but be looked down upon by Lu Zhong and others, but he felt that he was just relying on Ma Qiang and getting to a high position.

"Come, Jin Yun, tell me about the process and principle of this salt drying."

Speaking of technical issues, Jin Yun's eyes immediately lit up, and his voice became confident.

"Ladies and gentlemen, this is the first salt pan in our Donglai Salt Field, and according to our calculations, the water content in the seawater is 96.5 percent, and the remaining 3.5 percent is salt.

Among these salts, sodium chloride, that is, the salt we usually eat, accounts for 85 to 86% of all salts, and the remaining salts are mainly magnesium chloride, potassium chloride and calcium chloride. ”

？？？

What is he saying?

There were a few question marks on the heads of all the heroes in the back.

Ma Qiang rolled his eyes, God, hurry up and let the light of science spread to the world.

"The so-called bitter brine is actually magnesium chloride, potassium chloride and calcium chloride, which are all terms of my scientific school, so you can understand it roughly."

Lu Zhong and the others smiled awkwardly at each other, probably understanding... This... Let's take a closer look.

Ma Qiang motioned for Jin Yun to continue.

Jin Yun continued, "In our experiments, we found that the saturation solubility of different salts at different temperatures is different, and this is the calculation diagram I made. ”

Jin Yun took out a piece of paper from his arms, opened it and carried it to everyone, and what was drawn on the paper was a schematic diagram of a curve with the abscissa for temperature and the ordinate for solubility.

Well, Ma Qiang felt that except for himself, these people should not be able to understand it.

Jin Yun completely ignored the extremely confused eyes of these Haoqiang in front of him, and continued to say to himself, "Everyone should be able to understand that according to the standard of 100 grams of water, the solubility of sodium chloride is affected by the temperature and the change is very weak, at a room temperature of 20 degrees Celsius, the saturated solubility is about 36 grams; When heated to 90 degrees, it is only 39 grams.

Salts such as potassium chloride and magnesium chloride are different, as the temperature increases, their solubility changes particularly greatly, also at a room temperature of 20 degrees Celsius, the saturated solubility is about 55 grams, and when heated to 90 degrees, it rises to 70 grams. ”

Ma Qiang covered his face, yes, the two terms Celsius and gram must be incomprehensible to everyone present.

Ma Qiang had to interrupt Jin Yun and said to everyone, "To put it simply, the same water has less soluble salt and more bitter salt."

"Oh~~" A group of heroic and enlightened strokers nodded.

I don't know if I understand it or not.

"Therefore, according to the guidance of the gentleman, we tried to build this experimental field, you first look at these salt pans like paddy fields, we introduce seawater into the salt pans, use the power of the sun and wind to remove water, improve the salinity of seawater, which requires many times of water irrigation, when the salt content of the brine is enough... For example, this field has been drying for two days, and the salinity of the brine is already very high! ”