There are many edible magnesium products on the market, the more common one is food-grade magnesium oxide. However, magnesium oxide will produce dust during use, and granulation is relatively complicated, so food-grade granular magnesium oxide is used. Its excellent flowability, constant size distribution and density are superior to powdered magnesium oxide. Since this kind of magnesium oxide is produced in the shape of granules, it greatly reduces the granulation link of the customer’s production process, saves production costs, and is easier to granulate. The tablets made of magnesium oxide granules produced have high strength. The feet are not easy to crack and are clean without gray or black edges.
Magnesium oxide tablets are used in many aspects as pharmaceutical laxatives and mineral supplements. Generally speaking, tablets are manufactured by compressing raw materials into the shape of a tablet. The process of performing this compression molding is called the tableting process. In the tableting process, the compression operation is performed continuously and at high speed. Under such conditions, the pressure and density are dispersed inside the tablet, resulting in uneven internal structure, easy cracking, delamination, and gray and black edges. Especially white tablets with an added magnesium oxide ratio higher than 80% are more likely to experience tablet delamination and gray and black edges when extruded. In view of the above situation, it is hoped to develop a food-grade granular magnesium oxide product that is suitable for use in medicine or food additives, has high purity, and can reduce tableting problems and abnormal quality characteristics of tablets.
In order to solve the existing problems in the current granular magnesium oxide tableting process in the prior art, a food grade granular magnesium oxide for tableting and a preparation method thereof are provided, so that the hardness of the prepared magnesium oxide particles is moderate and the particle size distribution is It is good to obtain a method for preparing magnesium oxide particles for white tablets and vitamin tablets that is simple to prepare and has low energy consumption.
A preparation method of food grade granular magnesium oxide for tableting, including the following steps:
(1) Feed the magnesium hydroxide raw material into the cyclonic dynamic rotary furnace;
(2) It is indirectly heated and calcined at a high temperature of 650 to 950 degrees, and the generated magnesium oxide is dehumidified;
(3) Enter impurity removal, particle size treatment, granulation, and compression molding;
(4) Particle mixing.
It is characterized in that the mass fraction of magnesium hydroxide in the step (1) is 98% to 99%, the particle size is D502-56 micron, D906-97 micron, and the bulk density is 1-0.2 g/ml. It is characterized in that in the step (2), during heating and calcining, the preheating section is controlled at 650°C, the temperature rise time is controlled at 10 minutes, the calcining section is controlled at 850-950°C, and the time is controlled at 15 minutes; the cooling section is controlled at Below 550, the time is controlled at 20 minutes, the BET value is controlled at 30-60, and the crystal shape is approximately spherical. It is characterized in that in the step (3), impurities are removed by jet classification, and the treated powder is first spherically granulated through a 0.3-0.5cm spherical groove roller machine, and then subjected to secondary compression through a linear roller. Break up. It is characterized in that it is prepared by adopting any one of the above claims 1-4.