How to make calcium hypochlorite

Firstly, limestone and white coal are added into the lime kiln from the top of the lime kiln for calcining at a ratio of 1: (0.11 ~ 0.13), and the temperature is controlled at 800 ~ 1200℃. The generated lime is discharged intermitently from the bottom of the kiln, which is digested by adding water to obtain slaked lime containing a small amount of free water. After aging for more than 8 days, it is sent to the air separation system for slag removal by the winch. The powder slaked lime was separated by cyclone separator.
The fine lime containing 3% ~ 6% free water is added from the fourth layer of the chlorination tower by the stranded dragon under the slaked lime bin. Chlorine gas (liquid chlorine liquefaction tail gas) enters from the first layer of the chlorination tower, and the finished bleaching powder is discharged from the first layer of the chlorination tower.
The chemical equation is:
2Ca(OH)2+2Cl2→Ca(ClO)2+CaCl2+2H2O
The tail gas discharged from the chlorination tower is absorbed with liquid alkali to form Sodium Hypochlorite, and the exhaust gas is then vented.

The preparation method of calcium hypochlorite is: chlorine gas into the calcium hydroxide solution. At high concentration, Ca(ClO)2·2CaCl2 can be crystallized, which is widely used in bleaching paper: 2Ca (OH)2 + 2 Cl2 → Ca(ClO)2 + CaCl2 + 2 H2O or chlorine gas is passed into the mixed solution of calcium hydroxide and Sodium Hydroxide: 2 Ca(OH)2 + 3 Cl2 + 2 NaOH → Ca(ClO)2 + CaCl2 + 2 H2O + 2 NaCl