A brief history of talc mining

China has a long history of mining and utilizing talc . It was used for carving in the primitive society. For example, the half-length figure carved out by a talc block was discovered in Hougou County, Liaoning Province. It belongs to the Neolithic Age Cultural Site. Five to six thousand years. In t

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The concept and harmfulness of slime

The mud contained in the ore is called slime. The slime has the distinction of primary and secondary slime. The primary slime is the muddy material from the ore deposit. The secondary slime is caused by the looseness of the ore and the brittleness of the ore. It is caused by excessive crushing durin

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Re-selection of the basic principles (2)

This shows that the fact that a wide level can be sorted under interference and sedimentation conditions. Although it is one step ahead of the above theory, it is still difficult to make reliable calculations because the values ​​of θ 1 and θ 2 are difficult to determine and the

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How is cyanide poisoning people?

The toxicity of cyanide and compounds mainly comes from cyanide. It enters the human body through the respiratory tract, digestive tract and skin, produces hydrogen cyanide, inhibits cytochrome oxidase, prevents it from absorbing dissolved oxygen in the blood, causing paralysis of nerve function, a

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Use of gallium

The application examples and structures of gallium in the United States and Japan are shown in Table 1. Table 1 Application examples and structure of gallium (%) years Country application Optoelectronic component IC, semiconductor other 1985 United States 90 10 Japan 88 12 1996 Unit

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