A kind of preparation method of plugging mud ball suitable for industrial silicon smelting to produce silicon

Abstract

The invention provides a method for preparing eye-plugging mud balls suitable for industrial silicon smelting to produce silicon. The method for preparing eye-blocking mud balls suitable for industrial silicon smelting and silicon production includes the following steps: S1: mixing high clay, petroleum coke powder and electrode paste according to a certain proportion to obtain a mixture A; S2: adding the mixture A to the Add an appropriate amount of water and stir well until it has a certain viscosity. The mixture B is obtained; S3: The mixture B is manually kneaded into a trumpet shape according to the size of the furnace hole of each stove; S4: The trumpet-shaped mixture B is naturally air-dried to form a plugging mud ball. In the invention, petroleum coke powder with low iron content is used to replace part of high clay, thereby reducing the content of ductile iron in the mud and laying a foundation for improving product quality. Calculated for 2.8t silicon melt per furnace, iron can be reduced by 0.030%, and titanium can be reduced by 0.002%, which can reduce the impurity rate and avoid secondary pollution of products.

Description

technical field [0001] The invention relates to the technical field of silicon production, in particular to a method for preparing eye-plugging mud balls suitable for industrial silicon smelting to produce silicon. Background technique [0002] Eye plugging mud balls are made by mixing high clay and carbonaceous materials in proportion, and are in the shape of a horn. [0003] The silicon discharge furnace eye is an important channel for discharging silicon melt from the submerged arc furnace in the process of industrial silicon smelting. The smelting operation of intermittent discharge is generally smelted for 1-1.5 hours in one hour, and the high temperature silicon melt is discharged after the discharge is completed. The mud ball blocks the solid furnace eye to prevent leakage of high temperature silicon melt. When the furnace eye is opened, most of the mud balls blocked in the furnace eye enter the silicon melt. The iron, titanium and other impurity elements removed wil...

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Problems solved by technology

[0003] The silicon outlet hole is an important channel for discharging silicon melt from the submerged arc furnace during the industrial silicon smelting process. The smelting operation of intermittent furnace is generally smelted for one hour and released for 1-1.5 hours. Mud balls block the furnace hole to prevent high temperature silicon melt from leaking out of the hole. The removed iron, titanium and other impurity elements will cause product degradation after entering the silicon melt in large quantities

[0004] The mud balls used in the market are made by mixing high clay and electrode paste at a ratio of 2-3:1. The clay contains 7.6% iron and titanium: 0.36%; the electrode paste contains 0.09% iron and 0.52% titanium. The iron content of the mud balls is 5.9%, the titanium content is 0.52%, and 5-8 mud balls are blocked each time, and each mud ball weighs about 5Kg. When the furnace hole is opened, the mud balls in the furnace hole basically enter the silicon Melt, causing secondary pollution of the product

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