Preparation method of hole plugging mud ball suitable for industrial silicon smelting silicon discharging

Abstract

The invention provides a preparation method of a hole plugging mud ball suitable for industrial silicon smelting silicon discharging. The preparation method of the hole plugging mud ball suitable forindustrial silicon smelting silicon discharging comprises 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 a proper amount of water into the mixture A, and fully stirring until the mixture A has certain viscosity; obtaining a mixture B; S3, subjecting the mixture B to manual kneading into a hornshape according to the size of a furnace hole of each furnace table; and S4, naturally air-drying the horn-shaped mixture B to form the hole plugging mud ball. Petroleum coke powder with low iron content is adopted to replace part of high clay, so that the iron content of mud balls is reduced, a foundation is laid for improving the product quality, when a furnace hole is opened, the mud balls inthe furnace hole basically and completely enter silicon melt, calculated by 2.8 t of silicon melt in each furnace, iron can be reduced by 0.030%, titanium can be reduced by 0.002%, the impurity rate is reduced, and product secondary pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of silicon production, in particular to a method for preparing eye-blocking mud balls suitable for industrial silicon smelting to produce silicon. Background technique [0002] Eye plugging mud ball is made of high clay and carbonaceous material mixed in proportion. It is in the shape of a trumpet. It is an important consumable used to block the furnace hole when silicon is discharged and prevent the high temperature silicon melt from being discharged from the furnace. [0003] The silicon outlet furnace 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 discharge is generally 1-1.5 hours after one hour of smelting. Mud balls block the furnace hole to prevent high-temperature silicon melt from leaking out of the hole. When opening the furnace hole when the silicon is discharged...

AI Technical Summary

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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