Calcium hydroxide is obtained from the chemical reaction of calcium oxide and water, and is a traditional product of inorganic chemical industry. The processing method of high-purity calcium hydroxide is more complicated than that of ordinary calcium hydroxide, and it needs to use raw materials with high activity and low impurity content for processing. With the increase in market demand, the quality of calcium hydroxide on the market is also mixed, which needs to be carefully identified.
THE PROCESS OF HIGH-PURITY CALCIUM HYDROXIDE PROCESSING
1. Primary screening
Take limestone and coke for calcination, and calcined calcium oxide with a vibrating screen of 5~15mm to remove the “plain ash” with more impurities, and then crush it to about 5~25mm to obtain more than 90% effective components. High-activity calcium oxide is supplied to the pre-digester through a constant-weight feeder through an air-tight regulator. To remove iron, sulfate and other impurities in slaked lime, first of all, the quality of raw and fuel materials must be strictly controlled, and raw and fuel materials with high iron content (including other oxides) are strictly prohibited from entering the site.
2. Preliminary digestion
According to the quality of calcium oxide and the ratio of supply, according to the range of water-to-calcium ratio of 0.55~0.80, use the control valve to automatically adjust the amount of water added, so that it is mixed and stirred in the pre-slider for 5~15 minutes for preliminary digestion, and the digestion temperature is controlled to 90 ~190°C, and then sent to the ripener for further digestion for 10~40 minutes to ensure complete digestion reaction.
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