【Broadcast】Pay attention to "Reading at the starting point", get the first-hand news of 515 red envelopes, and students who have not grabbed red envelopes after the Chinese New Year can show their skills this time.

Both potassium sulfate and aluminum sulfate are water-soluble, and the alum composed of potassium sulfate and aluminum sulfate is water-soluble. The reason why alum stone is insoluble in water is that there are 3 moles of aluminum hydroxide in the composition of alum, aluminum hydroxide is insoluble in water, so the whole is insoluble in water, around how to deal with aluminum hydroxide design 4 lines to process alum stone, the goal is to improve the dissolution rate of potassium, including two quantitative indicators in water and 2% citric acid. The means are all ball mills.

While you are doing the experiment, you need to sort out the background knowledge, two aspects, one is the current situation of alumite, the treatment methods that have been reported, and so on. One is the demand for potassium salt, which indicates that the potassium in the middle of alum stone needs to be used, and here there is also a concept of slow-release fertilizer that needs to be learned and given a review. As the first chapter of your big dissertation, prepare it as soon as possible, and let me look at it from time to time in between.

The four lines are:

1 is a single ball grinding alum stone, the structure will be gradually destroyed, the water solubility will not be improved much, the dissolution rate in the weak acid will be improved, and quantitative evaluation will be carried out.

2 is mixed ball milling with calcium hydroxide, the purpose is to hope that the solid-state reaction between calcium hydroxide and aluminum hydroxide can be reacted into Ca3Al2(OH)12 when it is known to be alone, and it is hoped that alum and aluminum hydroxide can be separated, improve the water solubility of potassium, and evaluate both in water and weak acid.

3 is to add calcium hydroxide and calcium sulfate mixed ball mill, the purpose is to form aluminite between calcium hydroxide and aluminum hydroxide and calcium sulfate, to achieve the separation between aluminum hydroxide and alum, and also evaluate the dissolution rate of potassium in water and acid.

4. It is to directly add concentrated sulfuric acid and then ball mill to dissolve aluminum hydroxide, and the overall water solubility is improved.

You have to start the experiment, according to 1 and 2, prepare samples for dissolution test in water and acid, quantitatively analyze the dissolution rate of potassium, XRD infrared and other qualitative analysis, and then select a part according to the results. If you can get a high number of data here, 3 and 4 may not need to be done, or you may not need to do it in detail.

"Nelson, ask you something. ”

Hearing Xiang Yu's voice, Nelson turned his head and glanced at him, waiting for his next words.

"What is the credibility of the auction house? Will there be a deliberate low price quoted and then a high price changed hands?"

Nelson pondered for a moment, thought for a moment and said:

"Probably not, the reputation of the auction house has always been very good, at least I have never heard of such a thing in my circle. ”

Xiang Yu nodded, and his attention returned to the ongoing auction.

"The next thing we want to buy is the corpse of a sixth-level mid-level fierce beast, this fierce beast is a type of flesh and blood power, it should have just broken through to the sixth-level intermediate level. This is a fierce beast formed by the mutation of a tiger shark, and its scientific name is Canghai Fury. It was a strong man at the level of a warlord who entrusted us to conduct an auction, with a reserve price of 200 million energy points, and a price increase of 10 million energy points each time, and now the auction begins. ”

As soon as the words landed, the voices of various bids behind them were connected.

Xiang Yu was actually a little excited, he had now broken through to the warrior level, and if he wanted to continue to use the Blue Star Grass for body evolution, he needed the flesh and blood of a sixth-level fierce beast.

The flesh and blood of this kind of sea fury beast is actually very suitable, but the asking price is too high, so it is better to go to the auction to see if it is divided and sold in the future.

"Xiang Yu, is this really a sixth-level fierce beast?"

Juppé looked at the corpse of the furious beast on the big screen on the stage, his eyes full of surprise.

"Yes, although the body shape doesn't look as big as some fourth-level fierce beasts, but this guy is indeed a sixth-level Canghai Fury Beast, look at the white patterns on the top of its head, and if you are unlucky to encounter this kind of thing in the future, you can know how many levels it is according to this. ”

After Xiang Yu finished speaking, Nelson next to him couldn't help but praise:

"Your knowledge is truly amazing, and you even know this kind of thing. ”

Xiang Yu hurriedly humbled himself.

"I've seen it occasionally before, and it's not a great skill, but it's really funny. ”

At this time, the bidding price at the venue had reached 340 million energy points.

"Three hundred and sixty million. ”

This time, it was a guy standing in the open space next to him who held up the sign, adding 20 million at a time.

"Three hundred and seventy million. ”

The voice was tepid, it sounded like there was no fireworks, it was someone in the first row who was asking for the price, Xiang Yu looked at it carefully, and he seemed to have a little impression of this person.

It should be the guy who introduced himself to Chong Ruixing last time, the vice president of the United Council, and the guy who used to be the president of the Explorer Society.

Nelson saw that Xiang Yu seemed to be interested and was about to introduce him, Xiang Yu shook his head: "I have seen this guy at the banquet before, the vice president of the United Council, he does have some strength, but why does this guy buy this kind of thing in the auction house." ”

Nelson nodded first, then thought for a moment and said:

"Maybe it's because the corpse of the Canghai Fury Beast is more precious, and it's still a sixth-level fierce beast. ”

When the man standing in the clearing was about to continue shouting, a fellow next to him, who was supposed to be his companion, pulled his arm and motioned for him to stop shouting.

Sitting in the front of the first row is obviously a big man, competing with these people for the price, whether they can fight or not, when the time comes, the bad impression will definitely be left, and it may bring some trouble in the future, so it is better to simply quit.

The guy still looked at it with a tense face for a while and then relaxed, looking like he was ready to give up.

Xiang Yu shook his head, this auction doesn't seem to be as simple as it seems, the so-called justice is just a cover for those in power to absorb benefits.

Time passed quickly, one by one items were auctioned out, so far there has not been a single unauctioned, it seems that this auction center really put a little effort into collecting these auction items.

Xiang Yu has been thinking about the news that Hu Jinming got over in his heart, the auction and purchase of unknown items are arranged in the back, and he should have to wait for a while, but now he can only watch it like this first, and wait with peace of mind.

Xiang Yu originally wanted to encounter something worthwhile, and he also took a photograph.

But after looking at it so much, he found that although everything was not bad, it was also slightly rare in his eyes, and most of the things that were sparse and ordinary felt were commonplace.

Just when he was a little distracted and wanted to fall asleep listening to the host's repeated Chinese, the beautiful auctioneer spoke in a clear voice:

"It's a five-minute intermission, and in five minutes we'll have a batch of unknown items to be auctioned. The price is very cheap, the specific effect is not clear to us, buy it back and take a look, if you find out the function, you can also sell it back to our auction house, maybe you can get rich overnight. ”

After speaking, the auctioneer bowed, took a few steps back, and disappeared behind the scenes.

Xiang Yu frowned, feeling that the auction house's words seemed to be a little wrong, so he turned his head and asked Nelson:

"Is it always like this? I mean, the auction of unknown items, it sounds like gambling at all, and it's the auction house's dealer, what if they take something they already know is useless and they come out to buy it, and the people below don't know, won't they be deceived?"

Nelson shook his head and said: "Such a thing generally cannot happen, under the effect of energy, not to mention whether it can be cost, even if it can be faked, the auction house will not do it, the auction price of these unknown items is quite cheap, and it is not worth it at all to smash your own signboard for these small things." ”

Xiang Yu nodded thoughtfully.

It's really cheap, but, as I got the news, there must be a lot of malicious price reductions, the purpose of which is to make a little more money for yourself, or to befriend some other organizations.

The five minutes passed quickly, and the host came up again with a dancing posture, and a clear voice sounded.

"Everyone be quiet, the five-minute break has arrived, and the next thing we want to buy are some unknown items, the reserve price ranges from 10,000 to 10 million, although they are all unknown, but they are also carefully selected by us, there must be some things that contain great value, as long as everyone discovers the mystery, it is likely to be an unexpected wealth. ”

After the host finished speaking, several more beautiful women in red cheongsams came up, still each holding a box in their hands.

"The first auction item is an unknown primary ore, and as we all know, after the great change, the ore around the world has undergone great changes, and all kinds of new alloys have emerged in an endless stream, and now it has reached a bottleneck period after a blowout, and this ore is likely to mean a new alloy, or a material that has never been seen before, and then there is a patent for this alloy, which means a huge amount of wealth. Okay, the base price of this item is 600,000 energy points, and the price increase is 50,000 each time, start now. ”

Ps. chasing more children's shoes, are there any free appreciation tickets and starting coins~ The countdown to the 515 red envelope list is over, I'll pull a ticket, ask for an increase and appreciation vote, and finally rush a handful!