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Process for preparing high concentration milky calcium hydroxide

A technology of calcium hydroxide and calcium oxide, applied in the direction of calcium/strontium/barium oxide/hydroxide, neutralized water/sewage treatment, etc., to achieve the effect of low impurity content

Active Publication Date: 2011-02-09
HANGZHOU WENJIAN CALCIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After retrieval, no reports have been found on factories producing liquid calcium hydroxide products so far

Method used

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  • Process for preparing high concentration milky calcium hydroxide
  • Process for preparing high concentration milky calcium hydroxide

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preparation example Construction

[0018] The preparation method of this high-concentration milky calcium hydroxide of the present invention, step is as follows:

[0019] (1), take limestone with a calcium carbonate content ≥ 98.0% and reduce standard anthracite to be calcined in a vase-shaped mechanical shaft kiln at a weight ratio of 1:0.07 to 0.1 to generate calcium oxide; control the calcined maturity rate of calcium oxide at 95% Above, calcium oxide content ≥ 95.0%;

[0020] (2), the calcined calcium oxide is removed coal ash through a vibrating screen with an aperture of 5 to 10 mm, and then crushed by a crusher to control the particle size of the calcium oxide within 5 mm;

[0021] (3) The broken calcium oxide enters the primary digester after being measured by the electronic belt scale. The water in the primary digester is combined with calcium oxide in a spray state and stirred at a speed of 500 rpm to 1000 rpm. , Control the hydration time of calcium oxide in 15-25 minutes. The measurement of water ...

Embodiment 1

[0029] CaCO in limestone 3 CaO content in quicklime is 98%, the CaO content in quicklime is 95.5%, the ratio of water to calcium oxide is 0.47, the aperture of the vibrating screen is 5mm, the speed of classifier is 550 rpm, the ratio of water to powdered calcium hydroxide is 2.71, and the ratio of water to powdered calcium hydroxide is 2.71. attached figure 1 The milky calcium hydroxide that the method produces is tested each quality index as follows:

[0030] Calcium hydroxide concentration Hydrochloric acid insoluble content Pass rate of 325 mesh

[0031] 26% 0.13% 96.0%

Embodiment 2

[0033] CaCO in limestone 3 content of 98.8%, the CaO content in quicklime is 96.2%, the ratio of water to calcium oxide is 0.59, the aperture of the vibrating screen is 4mm, the speed of the classifier is 700 rpm, the ratio of water to powdered calcium hydroxide is 2.25, and the ratio of water to powdered calcium hydroxide is 2.25. attached figure 1 The milky calcium hydroxide that the method produces is tested each quality index as follows:

[0034] Calcium hydroxide concentration Hydrochloric acid insoluble content Pass rate of 325 mesh

[0035] 30% 0.09% 97.3%

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Abstract

The invention relates to a preparation method for high-concentration lacteous calcium hydrate, which comprises the following steps: firstly, taking limestone, calcining the limestone with a collimating mark anthracite coal, and generating calcium oxide; secondly, adding the calcium oxide into a digestion device after coal ash is removed by a vibration sieve and is crushed by a crusher and carrying out chemical combination to water in the digestion device and the calcium oxide in the sprinkling state; thirdly, enabling the calcium hydrate from the digestion device to pass through the vibrationsieve and adding screenings into a grader through a high pressure blower fan, separating the calcium oxide which has coarse particles and is not digested, and adding fine powder into a stock bin; fourthly, preparing the mass ratio of the water and the powdery calcium hydrate according to the requirements on the concentration of the lacteous calcium hydrate to ensure the complete digestion of superfine calcium oxide in the powdery calcium hydrate; and fifthly, enabling the lacteous calcium hydrate to pass through a screen and a hydraulic cyclone and then obtaining the finished lacteous calciumhydrate. The preparation method has the advantages that high concentration, low impurity content, the automation and the industrial production of the lacteous calcium hydrate are achieved; and the lacteous calcium hydrate can be directly used in the fields as industrial wastewater treatment and the like.

Description

technical field [0001] The invention relates to a preparation method of calcium hydroxide, mainly a preparation method of high-concentration milky calcium hydroxide. Background technique [0002] At present, most of the calcium hydroxide supplied in the domestic and foreign markets is solid powder. In the field of sewage treatment, the use effect of powdered calcium hydroxide is poor, mainly for (1) difficult operation, and the strong hygroscopicity of calcium hydroxide will cause damage to the Burns of human skin; (2) A large amount of dust during operation causes secondary pollution to the on-site environment. Large-scale IC production requires the control of dust particles of 0.1 μm to level 1 or even stricter) powdered calcium hydroxide is far from meeting its requirements; (3) there are many impurities, undigested perburned calcium oxide contained in powdered calcium hydroxide, Calcium carbonate, silicon dioxide and other impurities are burned raw, which is easy to blo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/02C02F1/66
Inventor 项建平盛转小胡富明
Owner HANGZHOU WENJIAN CALCIUM IND