阅读说明：本技术 一种食品级氢氧化钙的生产方法 (Production method of food-grade calcium hydroxide ) 是由 王文珠 于 2019-11-28 设计创作，主要内容包括：本发明公开了一种食品级氢氧化钙的生产方法,包括首先手选从采石场运来的石灰石原矿,其次用破碎机对石灰石进行粗破碎,经过筛选,再用雷蒙磨机磨粉碎得到细石灰石粉(生石灰),再进行筛选后,加纯净水制成悬浮液,通过滤膜过滤以去除杂质,然后进行煅烧、加水打浆、高温压滤、闪蒸水分、烘干,再经摆式雷蒙机磨研后,进行检测,符合指标的,将通过紫外线灭菌,最终作为产品包装入库。本发明的有益效果为：采用浮选的方式从采石场筛选出脉石(杂质)含量低的石灰石原矿,在破碎后经实测筛选出白度达到90以上的细石灰石粉(生石灰),最后经过检测筛选符合的产品,生产过程中多次进行过滤筛以保证产品的质量,本发明使用简单,可大面积推广。(The invention discloses a production method of food-grade calcium hydroxide, which comprises the steps of firstly, manually selecting raw limestone ore transported from a quarry, secondly, roughly crushing the limestone by using a crusher, screening, grinding and crushing by using a Raymond mill to obtain fine limestone powder (quicklime), screening, then adding purified water to prepare suspension, filtering by using a filter membrane to remove impurities, then calcining, adding water for pulping, performing high-temperature filter pressing, flashing moisture, drying, grinding by using a pendulum Raymond mill, detecting, sterilizing by ultraviolet rays, and finally packaging and warehousing as a product, wherein the detection is performed, and the detection meets the indexes. The invention has the beneficial effects that: the method comprises the steps of screening limestone raw ores with low gangue (impurity) content from a quarry in a flotation mode, screening fine limestone powder (quicklime) with whiteness of more than 90 through actual measurement after crushing, finally screening conforming products through detection, and performing filter screening for multiple times in the production process to ensure the quality of the products.)

1. A production method of food-grade calcium hydroxide is characterized by comprising the following steps:

the production flow comprises the following steps: the method comprises the steps of manually selecting raw limestone ore transported from a quarry, coarsely crushing the limestone by a crusher, screening, grinding and crushing by a Raymond mill to obtain fine limestone powder (quicklime), screening, adding purified water to prepare a suspension, filtering by a filter membrane to remove impurities, calcining, adding water for pulping, performing high-temperature filter pressing, performing flash evaporation moisture and drying, grinding by a pendulum Raymond mill, detecting, sterilizing by ultraviolet rays, and finally packaging and warehousing as a product, wherein the raw limestone ore meets indexes.

2. The method for producing food grade calcium hydroxide according to claim 1, wherein the method comprises the following steps: the manual limestone raw ore sorting method is flotation, and particularly relates to a method for sorting according to the difference of the floatability of minerals according to the difference of the surface physicochemical properties of mineral particles.

3. The method for producing food grade calcium hydroxide according to claim 1, wherein the method comprises the following steps: the limestone is coarsely crushed by a crusher to form crushed stone blocks of about 3 to 5 cm.

4. The method for producing food grade calcium hydroxide according to claim 1, wherein the method comprises the following steps: the crushed stone is ground by a Raymond mill to obtain fine limestone powder with the size of about 150 to 450 mu m.

5. A method for producing food grade calcium hydroxide according to claim 1 or 4, wherein: the whiteness of the fine limestone powder (quicklime) is required to reach more than 90, so that the quality of the fine limestone powder (quicklime) is improved.

6. The method for producing food grade calcium hydroxide according to claim 1, wherein the method comprises the following steps: the calcining temperature is 1100 ℃, and the calcining time is 1 h.

Technical Field

The invention relates to the field of food additives, in particular to a production method of food-grade calcium hydroxide.

Background

Calcium hydroxide is an inorganic compound of the formula Ca (OH)₂Commonly known as slaked lime or slaked lime. The calcium hydroxide can be classified into food grade, pharmaceutical grade and industrial grade, and the alkalinity is almost the same. The food-grade calcium hydroxide is widely used for synthesizing food additives, VC phosphate ester of feed additives, high-technology biological material HA, food konjak and calcium agents, additives of calcium naphthenate, calcium citrate and calcium lactate sugar industry, water treatment and other high-grade organic chemical industries.

The edible processing agent is mainly composed of food-grade calcium hydroxide, and is prepared by processing and refining lime to remove heavy metals and other harmful substances. After 500 deg.C, the water loses its binding property and becomes calcium oxide, and when absorbing carbon dioxide in air, it becomes calcium carbonate, which is soluble in acid, slightly soluble in water and insoluble in alcohol. It is noted that calcium hydroxide dust or suspension droplets can cause irritation of mucous membranes, sneezing and coughing, as well as alkali, emulsify fats, absorb water from the skin, solubilize proteins, irritate and corrode tissues. Inhalation of lime dust may cause pneumonia. Care should be taken during use to ensure safety and wear the associated armour against inhalation and direct touch.

In the prior art, the screening of limestone raw ores is lacked, so that the raw ores with high gangue (impurity) content are selected, and the extraction of quicklime is influenced. Moreover, the filtration of the product is not enhanced during the production process, which directly affects the quality of the final product.

In view of the current situation, the invention provides a production method of food-grade calcium hydroxide.

Disclosure of Invention

In order to solve the problems, the invention provides a production method of food-grade calcium hydroxide, which has the following specific technical scheme:

a process for preparing food-class calcium hydroxide includes such steps as manually choosing raw limestone, crushing, screening, grinding by Raymond mill to obtain fine limestone powder, screening, adding purified water to obtain suspension, filtering by filter membrane to remove impurities, calcining, adding water, beating, high-temp filter pressing, flash evaporating, baking, grinding by pendulum Raymond mill, ultraviolet sterilizing, and packing.

Preferably, the mode of hand-sorting the limestone raw ore is flotation, in particular to a method for sorting according to the difference of the floatability of minerals according to the difference of the surface physicochemical properties of mineral particles.

Preferably, the limestone is coarsely crushed by the crusher to form crushed stone blocks of about 3 to 5 cm.

Preferably, the crushed stone is ground by a Raymond mill to obtain fine limestone powder with the size of about 150 to 450 mu m.

Preferably, the whiteness of the fine limestone powder (quicklime) must reach more than 90, so that the quality of the fine limestone powder (quicklime) is improved.

More preferably, the calcining temperature is 1100 ℃, and the calcining time is 1 h.

The invention has the beneficial effects that: the method comprises the steps of screening limestone raw ores with low gangue (impurity) content from a quarry in a flotation mode, screening fine limestone powder (quick lime) with whiteness reaching more than 90 through actual measurement after crushing, adding water for mixing, calcining, filter-pressing and drying, detecting, screening and differentiating products to obtain products, and performing filter-screening for multiple times in the production process to guarantee the quality of the products, wherein the rings are buckled with each other.

Detailed Description

The technical solution of the present invention will be described in more detail and fully below.

A process for preparing food-class calcium hydroxide includes such steps as manually choosing raw limestone, crushing, screening, grinding by Raymond mill to obtain fine limestone powder, screening, adding purified water to obtain suspension, filtering by filter membrane to remove impurities, calcining, adding water, beating, high-temp filter pressing, flash evaporating, baking, grinding by pendulum Raymond mill, ultraviolet sterilizing, and packing.