Reactor for preparing high-viscosity silicon-steel magnesium oxide and preparation method thereof
A silicon-steel-grade, high-viscosity technology, applied in the field of magnesium oxide, can solve the problems of poor coating performance, low content of high-viscosity magnesium oxide and high hydration rate, and achieve low cost, simple preparation method and improved automation level.
Inactive Publication Date: 2014-01-22
上海实业振泰化工有限公司
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Problems solved by technology
With the continuous development of oriented silicon steel sheet technology, the market demand for silicon steel grade magnesium oxide with a viscosity greater than 50cp is also increasing. However, traditional high-viscosity magnesium oxide has low magnesium content, high hydration rate, and poor coating performance, which cannot be achieved. Technical requirements for the production of grain oriented silicon steel sheets
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[0025] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific diagrams.
[0026] refer to figure 1 Shown, a kind of preparation method of high-viscosity silicon steel grade magnesia comprises the following steps:
[0027] Step 1: Add a certain amount of magnesium oxide powder into the reactor, and add magnetized active water and surfactant to carry out hydration reaction. The temperature of hydration reaction is 80-90°C, and the time of hydration reaction is 1~2 hours. Preferably 1 ~ 1.5 hours; wherein the weight of the surfactant is 1%-5% of the weight of the magnesium oxide powder;
[0028] Step 2: the product after step 1 hydration is separated, washed with water and dried to obtain magnesium hydroxide;
[0029] Step 3: Add the magnesium hydroxide obtained in step 2 into a high-temperature converter, and use a dynamic...
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The invention relates to a method for preparing high-viscosity silicon-steel magnesium oxide. The preparation method comprises the following steps: (a) placing magnesium oxide powder and a surfactant in a reactor, and adding activated water into the reactor to carry out hydration reaction, wherein the temperature of the hydration reaction is 80-90 DEG C, and the time of the hydration reaction is 1-2 hours; (b) carrying out separating, water washing and drying on a product obtained after the hydration reaction in the step a, so as to prepare magnesium hydroxide; and (c) placing the magnesium hydroxide prepared in the step b into a high-temperature converter, and calcinating by using a dynamic calcinating method so as to obtain magnesium oxide particles, wherein the calcinating temperature is 900-980 DEG C and the calcinating time is 2-4 hours; and crushing and grading the magnesium oxide particles so as to obtain high-viscosity silicon-steel magnesium oxide. The method disclosed by the invention has the beneficial effect that through controlling water for hydration and improving a drying process, the automation level of a production process can be improved, and on the premise of no change of important indexes such as hydration rate, the viscosity of silicon-steel magnesium oxide is improved.
Description
technical field [0001] The invention relates to the technical field of magnesium oxide, in particular to a reactor for preparing high-silicon steel-grade magnesium oxide and a preparation method thereof. Background technique [0002] Silicon steel grade magnesia is mainly used in the production of oriented silicon steel. In order to make the iron metal atoms into a regular orientation arrangement, and at the same time form an excellent insulating film on the surface of the silicon steel sheet, the role of magnesia is firstly used as a high temperature annealing isolation in the manufacture of silicon steel sheets. At the same time, it has the function of forming magnesium silicate vitreous insulating coating with silicon, and it can remove impurities such as sulfur and phosphorus in silicon steel during high temperature reaction. [0003] The slurry of silicon steel grade magnesium oxide has strong adhesion to the surface of silicon steel sheet, so that it will not fall off ...
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IPC IPC(8): C01F5/08
Inventor 宗俊傅涛徐艳霞武艳妮
Owner 上海实业振泰化工有限公司