Quicklime hydration method

Abstract

The invention relates to the technical field of quicklime hydration, in particular to a quicklime hydration method. The method comprises the steps that a traditional spiral propeller is transformed into a flat-blade paddle stirring rod, quicklime is squeezed and pushed to pass through three hydration chambers by means of the accumulation of the quicklime under the action of the gravity, the hydration time is prolonged, and the hydration degree of the quicklime in the hydration chambers is greatly increased; the temperature in the hydration chambers is controlled to be 100-120 DEG C through a gas circulation system and condensing equipment, thereby not only ensuring the quick hydration of the quicklime, but also avoiding the damage of a high-temperature environment to the equipment, and also ensuring that the quicklime and calcium hydroxide have moderate viscidity during hydration, so that pelletizing is facilitated, the gas permeability during sintering is good, and the yield and quality of sintered ore are greatly improved; clogging of the hydration chambers caused by excessively sticky raw materials is also overcome.

Description

technical field [0001] The invention relates to the technical field of quicklime digestion, in particular to a quicklime digestion method. Background technique [0002] Theoretically, the conversion of calcium oxide (CaO) into calcium hydroxide (Ca(OH)2) only needs to add water to realize the conversion process. However, according to a wide range of actual cases, if complete conversion is to be achieved, the way of adding water, the temperature of adding water, and the process method during the conversion process are closely related. [0003] Extensive field experience and laboratory data show that: [0004] 1. Soaking calcium oxide (CaO) in water is not easy to digest, and it will also calcify calcium oxide (CaO) in water to form hard small spheres. [0005] 2. Calcium oxide (CaO) mixed with hot water can shorten the digestion time and improve the digestibility. [0006] 3. Calcium oxide (CaO) has an excellent digestion effect when the water distribution is moderate, the...

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Problems solved by technology

[0007] 4. During the conversion process of calcium oxide (CaO) into calcium hydroxide (Ca(OH)2), a large amount of hot steam and dust will be generated due to digestion with water. If it cannot be treated in time, the following consequences will result: ① Digester exhaust Pipeline blockage; ② waste of raw materials; ③ poor site environment; ④ corrosion of other equipment on site

[0010] (1) Digestibility is too low

[0011] The quicklime continues to be digested after adding water in the first mixer, and the material bonded to the surface of the quicklime is broken by the digestion and expansion of the quicklime, which is not conducive to pelletizing, resulting in poor air permeability and high negative pressure during the sintering process, which affects the output of sintered ore and quality

[0012] (2) Uneven alkalinity

[0013] Since the quicklime cannot be completely digested, the alkalinity distribution of the sinter is uneven, which affects the smelting index of the blast furnace

[0014] (3) Serious pollution, no professional supporting dust removal equipment

[0015] The digestion time of the humidifier for quicklime is less than one minute, and the digestion time is too short, resulting in a low digestibility. Most of the quicklime can only be digested on the conveyor belt and inside the mixer, resulting in a large amount of hot steam and dust scattered on the ingredients. On-site, resulting in extremely serious steam and dust pollution on site

Moreover, the humidifier does not have perfect dust removal equipment, which causes frequent and serious blockage of the exhaust pipe, increases the labor intensity of the on-site staff, and reduces the operating rate.

Because the emitted hot steam and dust are alkaline substances, it not only seriously pollutes the site environment, but also causes serious corrosion to other equipment on site, which reduces the overall operation rate of the equipment and increases the failure rate

Calcium oxide (CaO) and calcium hydroxide (Ca(OH)2) emitted to the site will also cause hazards to the health of site operators

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