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Chapter 1282 The last stop

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    Mr. Zhao stood beside an open-pit mine that was about ten feet deep, watching the short Japanese miners carrying up the excavated ore in wicker baskets.

    Zhao Ping asked someone to carry a basket over, and from the gravel wicker basket full of floating soil, he found reef sand and showed it to Mr. Zhao.

    The so-called ¡®reefs¡¯ are lumps of silver ore, and the finely divided ones are ¡®sand¡¯.  Zhao Hao took a fist-sized piece of silver reef and looked at it carefully. He saw that there were branch-like silver lines on its surface.

    Zhao Ping told him that this is called ¡®rivet¡¯, which is the silver contained in the ore.  He took out a copper-shell magnifying glass from his breast pocket, magnified the surface of the ore to Zhao Hao and said, "Those golden spots on it are gold."

    "So few?" Mr. Zhao couldn't help but exclaimed.

    "The average gold content in a ton of ore is about five grams." Zhao Ping said calmly: "This quality is already extremely high. Daming's ore is about 2 grams per ton, and it does not contain silver."

    As he spoke, he sighed and said: "It is said that 'Kun Yuan Essence, there is no silver within three hundred miles of the place where gold comes out, and there is no gold within three hundred miles of where silver comes out'. However, there are not only gold and silver mines on Lightning Island.  , and there are gold and silver associated mines, which shows that the arrangement of creation is not something that ordinary people can speculate on."

    "This can all be explained by science. The conclusion is wrong. I can only say that the summary method is unscientific." Mr. Zhao said lightly: "How much silver is produced from the ore?"

    "It's about four to five hundred grams per ton." Zhao Ping replied: "The purity is very high."

    "That's really good." Zhao Hao said in surprise: "It's higher than Iwami Yinshan."

    "I have also visited Shi Jian. The quality of the ore is almost the same, but the mining conditions are much worse than here." Zhao Ping waved his hand and asked the two porters to carry the heavy wicker basket to the ore dressing field at the foot of the mountain.  Wash selection.

    That¡¯s of course, how many years has Iwami Silver Mountain been mined?  We have dug through the mountain a long time ago, how can we compare with this new mine where ore can be found just by digging a hole?

    "Once all the ore veins are almost explored, we can plan the structure of the mine, install lifting equipment, and lay a railway track leading to the waterwheel mineral processing site." Zhao Ping said excitedly: "This way the efficiency can be greatly improved.  , the production capacity can be increased significantly without increasing manpower too much.¡±

    Jiangnan Group Mining Corporation currently operates nearly ten large and small mines including coal mines, iron mines, sulfur mines, chalcopyrite, lime mines, and alum mines.  The research center is constantly introducing and improving various machinery to improve production efficiency. The production level should now be firmly among the top in the world.

    "Well, let's do it freely." Zhao Hao was also infected by his passion and said: "If you need any equipment, please report directly. I have informed President Jiang that I will provide it to you first." He patted Zhao Ping's hand vigorously.  Shoulder said: "Let's go and see how gold and silver are made?"

    ??~~

    The ore transported from the mine is first hand-selected and washed in the ore dressing field to remove impurities and crushed into ore, and then it can be smelted in the furnace.

    At the current stage of creation, the furnace for refining silver is still made of earth.  The earthen furnaces are about five feet high, and each furnace can hold two stones of silver ore.  Then add 200 kilograms of chestnut charcoal and stack it around the ore In fact, it is more efficient to use coal. Unfortunately, the coal route from Jiangnan to Sado Island has not yet been opened, so we can only make do.

    The bare-chested workers, working in groups of three, pulled the bellows back and forth to increase the temperature in the furnace.  There is also a furnace director who directs other workers to add charcoal with a long shovel from time to time until the ore in the furnace melts into a ball and then turns off the fire.

    This step is called ¡®sintering¡¯, and the purpose is to remove non-metallic impurities in the ore.  Two stones of ore can produce about a hundred kilograms of 'reef mass' which is actually an alloy of gold, silver, lead and tin, and more than 90% of it is lead.  After cooling, they need to be transferred to another 'gold separation furnace' to continue calcining at high temperature to separate them.

    The reaction in the gold-separating furnace is mysterious and mysterious as recorded in various ancient texts, but after Zhao Ping studied "Elementary Physics", he knew that this was actually just using the different melting points of metals to separate the various components in the 'alloy'.

    First, the tin with the lowest melting point will melt first and then flow out from the small hole at the bottom of the furnace.  Because tin is a base metal and the quantity obtained is small, it is simply thrown away without processing.

    ?????????????????????????????????????????????????????????????????????????????????????But what flows out is lead oxide, and it has to be re-smelted in another furnace to get the lead pole used for making projectiles.

    In fact, if the temperature is well controlled, gold and silver can also be separated.  However, the melting points of both are around 1,000 degrees, with a difference of only 100 degrees. With the current technical conditions, it is obviously impossible to accurately control the temperature below 1,000 degrees, so direct separation is not yet possible.

    This requires the use of knowledge from "Elementary Chemistry" - add sulfur to the furnace to react the sulfur with silver to form silver sulfide.  The melting point of silver sulfide is only 825 degrees, which is far away from the melting point of gold.  Just??And the manpower in the security area is too tight.

    So after building the bastion and dock for them, the engineering team withdrew to Lightning Island to continue construction, leaving only a hundred Marine Police officers and soldiers stationed alone on this extreme island four thousand miles away from the Ming Dynasty.

    Therefore, when the fleet sailed into the Zhenyuan Island pier, all the coast guard soldiers put on their police uniforms, lined up neatly on the side of the ship, stood on the slope and saluted, paying tribute to these respectable sentinels from the end of the world!

    All the officers and soldiers of the Zhenyuan Island Marine Police Station, wearing police uniforms and well-polished leather shoes, were waiting eagerly on the pier.

    There was no music, no firecrackers, not even a banner. It was no less shabby than the previous welcome ceremony, but this quiet scene made people feel extremely solemn, and a sense of sacred mission arose spontaneously.

    ps. Second update in a row.  (Remember the website address: www.hlnovel.com
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