輕燒鎂粉是一種重要的耐火材料 Light burned magnesium powder is an important refractory material
發布日期：2017-05-04 00:00 來源：http://www.chinaqdzhenhua.com 點擊：
1 成品每批的重量不大于 120 t 。
2 測定粒度的樣品應在組批前進行采樣,化學分析的樣品應在組批后進行采樣。小袋 (25kg) 每 20 袋取一個份樣,每個大袋 (1000kg)取一個份樣。
將取得的粒度樣品充分混勻后,點取 10~20g 測定粒度?；靹蚝蟮幕灅悠房s分為 200g 送化驗室進行分析。
Light burned magnesium powder is an important refractory material
Light-burned magnesia powder is a raw material with medium alkalinity and chemical activity. In addition to being used as refractories and gelling materials, it is also used in other industrial fields. In addition, the development of converter slag splashing furnace protection technology has further expanded the scope of application of light-burned magnesia powder. At present, slag-spattering furnace protection technology mostly uses light-burned magnesia powder into balls, including light-burned magnesia powder balls, carbon-containing light-burned magnesia balls and carbon-containing calcium-containing light-burned magnesia powder balls.
Light-burned magnesia powder, referred to as light-burned magnesia powder, is a kind of activated magnesium oxide obtained by calcining magnesite, brucite and magnesium hydroxide extracted from seawater or brine to about 800 ~ 1000 ℃. Light-burned magnesium powder is a light yellow and light brown powder with a particle size of less than 100 mesh. The periclase crystals are very small with a density of 3.07 ~ 3.22g / cm3, a large lattice constant, many lattice defects, and a crisp texture. It has a porous structure and is highly reactive. It is easy to undergo solid phase reaction or sintering. It reacts with water to form Mg (OH) 2 and hardens. It has binding ability.
Selecting the calcination method and controlling the light firing temperature are important means to obtain good activity. With the increase of calcination temperature, the specific surface area of MgO decreased significantly. When the temperature is higher than 1000 ° C, the recrystallization speed of MgO increases, the degree of dispersion decreases sharply, and the activity deteriorates. Using different calcination methods and calcining equipment at the same temperature is also an important factor affecting MgO activity. If it is calcined by a boiling furnace or a suspension furnace, it can be quickly and rapidly decomposed to obtain light-burned magnesia powder with maximum activity. By adopting the block method of tunnel kiln and reflection kiln, the calcination time is long, and the surface is often over-burned and the internal burn-in is caused, which will reduce the activity of light-burned magnesium oxide powder. Rotary kiln is used for calcining granular magnesite, the situation lies between the two, and it can also keep the activity of obtaining lightly burned magnesia powder.
1 The weight of each batch of the finished product is not more than 120 t.
2 Samples for determination of particle size should be sampled before the batch, and samples for chemical analysis should be sampled after the batch. Small bags (25kg) take one sample every 20 bags and one large bag (1000kg) take one sample.
After the obtained particle size sample is thoroughly mixed, 10 to 20 g is taken to determine the particle size. The mixed test sample is divided into 200g and sent to the laboratory for analysis.
3 Inspection results If any chemical composition is unqualified or abnormal, double the number of samples in the same batch of product for re-inspection once, and the re-inspection result is the final inspection result of the batch of products.
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