在进料中加入纯碱或烧碱，小球的表面就变粘并为细粉覆盖。
By adding soda ash or caustic soda to the feed stock, the surface of the pellets becomes sticky and coated with fines.
过粗的纯碱颗粒不利于玻璃的熔制，其上限应控制在26目左右，而纯碱细粉的含量则应控制在合适的范围内。
The upper limit should be less than 26 meshes. Finer powder's content should be controlled within a proper range.
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