Method and apparatus for fracturing polycrystalline silicon

A method for fracturing polycrystalline silicon, comprising steps of placing the polycrystalline silicon in a water tank containing water;

• and applying an instant high voltage to the water tank so that high-voltage discharge occurs in the water of the water tank, to fracture the polycrystalline silicon;
• wherein the step of applying an instant high voltage to the water tank comprises steps of:
• charging a charging capacitor;
• and
• continuing charging the charging capacitor until voltage of the charging capacitor reaches a breakdown voltage of a disconnecting switch, so that the disconnecting switch is broken down and all voltage stored in the charging capacitor is applied to the water tank;
• wherein the breakdown voltage of the disconnecting switch is in a range of 30˜200 kV;
• wherein the polycrystalline silicon before being fractured is a cylindrical polycrystalline silicon rod with a diameter of 80˜200 mm, a length of 200˜2800 mm;
• and
• wherein the fractured polycrystalline silicon has irregular shapes, and the distribution range of sizes of the fractured polycrystalline silicon is specified as follows:
• the polycrystalline silicon with a linear dimension of 0˜25 mm takes up 3-21% of total weight;
• the polycrystalline silicon with a linear dimension of 25˜50 mm takes up 4%˜36.5% of total weight;
• and the polycrystalline silicon with a linear dimension of 50˜100 mm takes up 43.5%˜91.5% of total weight.