Rongdu is a dense modern manufacturing industry such as aviation industry and semiconductor materials in southwest China, and it is very easy for Wu Feng to find a metal wholesale market.

The taxi driver was familiar with the road and took Wu Feng to the Southwest Industrial Materials Trade City located in the northern suburbs of Rongdu, which covers a huge area and the gates of the trade city are extremely rich in metal tension, and they are all kinds of metal cast and welded Transformers.

There are not many people in the trade city, but there are many forklifts shuttling back and forth and trailers parked at the door of the shop.

Wu Feng took a general look, most of the merchants are selling rebar, stainless steel, aluminum alloy, etc., so it is not difficult for Wu Feng to find ordinary metal materials, what iron, copper, aluminum, tin, nickel, gold, silver, lead, zinc, etc., everything.

However, the spirit core reminded Wu Feng to pay attention to the fact that intelligent nanorobots are designed to deal with war, need to adapt to harsh environments, complex climates, harsh electromagnetic radiation, and in order to resist attacks such as light energy weapons and ion weapons, they are alloys of various elements.

Common metals such as iron, copper and aluminum on the earth are abundant, but they are not important for intelligent nanorobots, on the contrary, the earth's rare metals such as tungsten, titanium, vanadium, zirconium, tantalum, niobium, and beryllium are inherently insufficient, but they are quite critical.

Therefore, Wu Feng focused his search on rare metal sellers.

It was a waste of time to wander around the huge trade city, and Wu Feng inquired around before he found a shop called "Zhengtai Rare Metals".

There are only two electric bicycles parked in front of the shop, and there is not a single customer in the shop.

Inside the spacious shop, there are aluminum alloy shelves along the wall, which are strangely protected by thick bulletproof glass, and there are many surveillance cameras inside and outside the store, completely covering no dead ends.

Wu Feng has excellent eyesight, and at a glance, he saw a lot of rare metals he needs, indium, germanium, cobalt, tungsten, silicon, bismuth, gallium, titanium, etc. are also in stock, and even rare earths are also available.

"That's it!"

Wu Feng made up his mind and walked into the store without hesitation.

The owner of the store is a fat man, and when he saw a customer coming, he immediately smiled and took the initiative to introduce it.

"This handsome guy, what to buy? Our store can be said to be the only rare metal merchant with a complete variety in the entire trade city, both retail and wholesale! ”

A few years ago, rare metals were restricted from export trade and wanton mining by the Chinese Republic on the grounds of protecting strategic reserve resources, and a small part of the functional materials of electronic products such as tantalum, which is also a strategic material of the United States, are also on the shelves in the storefront.

Wu Feng nodded with satisfaction, the boss was right, after looking around, he had all the rare metals that could be allowed to be sold on the market, but the price was quite expensive.

For example, a large number of germanium used in night vision devices, thermal imaging equipment, although Huaxia germanium reserves are the world's first, but the output is also very small, the shelves are placed with a few germanium grains similar to the shape of buttons, and its price per kilogram is 12,000 yuan.

But germanium still seems to be relatively cheap, and there are a lot of good things on the shelves.

In kilograms, 100,000 iridium, 160,000 palladium, and 240,000 rhodium......

The most bullish estimate is platinum, with a price tag of 290,000 per kilogram.

No wonder the sling often sighs, "The platinum diamond ring is eternal, and if you buy one, you will go bankrupt."

Wu Feng secretly calculated, with the goal of gathering 30 kilograms of battle soul armor, considering the current level of smelting and purification of rare metals in China, he almost had to gather about 45 kilograms of various rare metals.

Based on the average price of 150,000 yuan per kilogram, then the material cost alone will cost 6.75 million yuan.

Moreover, to complete the in vitro culture and proliferation of intelligent nanorobots, it is necessary to prepare almost one ton of excellent electrolyte solution, pour all rare metals into it and mix, and also need to continue to energize to replenish the energy consumed by nanorobot proliferation.

With such a rough calculation, the electrolyte solution is not difficult to find, at most a few thousand yuan per ton, but the electricity bill is troublesome.

Electrolysis of one ton of aluminum, at present, the latest domestic technology also consumes nearly 12,000 degrees of electricity, how complex the composition of intelligent nanorobots, every proliferation will be extremely energy-consuming.

The spirit core is calculated based on the industrial electricity consumption of Huaxia three-phase 380 volts, which will consume at least 100,000 kilowatt-hours of electricity per day, and every kilogram of multiplication basically takes a week's time, in other words, if Wu Feng wants to make up 30 kilograms, he has to wait for more than 200 days, and consumes 20 million kilowatt-hours of electricity.

Based on the current calculation of four cents and five cents per kilowatt-hour of industrial electricity, the electricity bill alone will cost 9 million yuan.

Wu Feng had to make careful calculations, the material cost had to be prepared for 7 million yuan, the electricity cost had to be prepared for 10 million yuan, plus the rental of electrolytic cells and even the recruitment of special care, etc., also cost money.

Without 20 million yuan as a foundation, it is impossible for Wu Feng to reappear in the Battle Spirit Suit.

Fortunately, Wu Feng has saved a little over the years as a mercenary, and there are still deposits in Swiss banks, but because Huaxia stipulates that each citizen can only transfer 50,000 US dollars per year, Wu Feng has only used more than 300,000 yuan since returning to China.

The deposit in the Swiss bank, Wu Feng can't use it for the time being.

Seeing that Wu Feng had been thinking a little, the boss was not in a hurry to speak.

The funds could not be put in place for the time being, and the site was not found, so Wu Feng could only try to produce in small batches first.

"Boss, this is the list of materials I need, you can take a look first!"

Wu Feng tore off the list he had written down after communicating with the spirit core along the way, tore it off the shorthand book and handed it to the boss, the boss was overjoyed when he saw it, and the boss immediately smiled when he saw this item and the quantity.

"The handsome guy is engaged in scientific research, right?"

Seeing Wu Feng nodded, the boss said with a smile: "I want so many kinds of metals, and the amount of each is not much, at first glance, it is used for experiments, our store also supplied a batch of goods to the Optoelectronics and New Materials Laboratory of Southwest University yesterday, and other research units in Rongdu also cooperate." ”

The boss took the computer and calculated it, and asked after a while: "By the way, brother, can you reveal the information of your unit, if you can cooperate for a long time, you can also get a discount." ”

Wu Feng shook his head and said, "I'm sorry, we have regulations, and it's inconvenient to disclose the information of the unit, but we will definitely be able to cooperate in the future." ”

The boss didn't ask any more questions, the units that use expensive and rare metals for experiments are all gold-swallowing monsters, and the only ones that can support such units are state-owned enterprises or the military, and educational and scientific research units are also among them, but they are the most expensive for military scientific research.

Looking at Wu Feng's straight posture, the boss was sure that Wu Feng was a procurement of a military scientific research unit, and there were many such units, so it was quite normal to buy some materials temporarily.

The rare metal trading is known as "if it is not open for three days, it can be eaten for three days when it is opened", which is enough to show that it is very profitable, and Wu Feng has to buy about 100,000 goods at a time, so he is naturally overjoyed.

Call all the lazy clerks, and the fat boss will go into battle in person for fear of making mistakes.

Expensive rare metals are not sold in Chinese cabbage, Wu Feng wants many items, but each of them is very small, and a few metals even only need a few grams.

The owner moved out of the shop, an electronic balance that can be used to weigh diamonds, with an accuracy of one ten-thousandth of a gram.

After the loading was completed, Wu Feng got a pallet with a wooden frame on the pallet, and the test tubes densely attached to the identification label were inserted and fixed on the wooden frame.

Each test tube represents a metal, the most expensive platinum, only a small pinch can be seen at the bottom of the glass test tube, but it is also several hundred yuan.

After tossing and turning, Wu Feng spent more than 90,000 yuan, but at most it was only enough for the nanobot to multiply less than a catty.

Wu Feng didn't take the initiative to ask for an invoice, but he was so happy that the boss was so happy that he kissed Wu Feng.

After checking out, the boss presented a gilded business card with smiling hands, and enthusiastically introduced to Wu Feng where to sell electrolysis equipment.

It was another expense, Wu Feng bought all the electrolysis equipment and solutions, but because ordinary metal could not withstand the corrosion of electrolyte, the container was a glass cylinder.

After taking a taxi back to the basement of the wholesale fruit market and closing all the doors, Wu Feng couldn't wait to start experimenting.

The remaining space of the glass tank containing the electrolyte solution is sufficient, and the positive and negative electrodes provided by the Wufeng electroplating factory are first energized after being put in, and then the wooden stoppers of the purchased test tubes are disassembled and all the expensive rare metals are poured into it.

The spirit core quickly responded to Wu Feng's order, and selected a batch of intelligent nanorobots that emerged from Wu Feng's right fingertips, condensed into multiplication units the size of rice grains, and then automatically fell off and fell into the electrolyte solution in turn.

As long as there is continuous power and enough rare metals to consume, proliferation will continue, and occasional power outages will not get in the way, and the intelligent nanorobots themselves have a certain amount of energy reserves.

Although the process of multiplication is slow, the rate of electricity consumption is rapid.

Wu Feng didn't pay attention to whether there were small grains forming in the electrolyte solution, but looked at the meter and was stunned.

It consumes almost one kilowatt-hour of electricity in almost a second, and at this rate, it won't be long before the electricity bill paid in advance in Rouen will be gone.

Said Cao Ying, Cao Ying, and arrived.

Rouen returned from looking at the house, with a sad and indignant face.

Seeing that the basement was brightly lit, he found Wu Feng in the power distribution room, and at this moment Wu Feng was in a daze in front of the meter.

After thinking about it, Rouen still couldn't help it, and opened his mouth and began to complain.

"Brother Feng, I didn't buy it, it's so expensive, 20,000 yuan per square meter, it's just a money grab!"

The voice of complaining woke Wu Feng up, "Where are they called robbing money, you come to see this!" ”

Wu Feng said, pushing Rouen to the meter, his short-sighted eyes straightened his glasses, and almost scared him to death, it was even more powerful than last night's power consumption.

"Feng, Brother Feng, what are you playing, I don't have a few dollars left in my electric card!"

As soon as the words fell, the lights above the two of them went out.

"Damn, Rouen, your crow's mouth is too accurate, why don't you say that there is no electricity!"

Wu Feng complained and walked out of the power distribution room in the dark.

Fortunately, there is still electricity in the basement room, thanks to Rouen's long underground operation in the online world, equipped with UPS online uninterruptible power supply and lead-acid battery pack in case of emergency.

But how can the electricity of the backup power supply withstand the proliferation consumption of nanorobots, Wu Feng hurriedly returned to the bathroom without thinking about it, unplugged the electrode power supply socket, and let the proliferation continue to rely on the energy brought by the nanorobots for the time being.

After thinking about it again and again, Wu Feng had to take the problem of electricity seriously, and the high cost of electricity seemed to have become a big problem hindering the repair and reconstruction of the Battle Spirit Armor.

It is no wonder that Boguka, which has strong scientific and technological strength, has only been trial-produced in small batches, and if it is really necessary to equip tens of millions of troops on a large scale, it is simply a huge money-burning campaign.

"Perhaps, the two big families of Zhang and Cao should be given some blood!"

Wu Feng smiled coldly and came up with an extremely bold plan.

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