一般粘土(尤其是肥粘土)制瓦坯在生产过程中,特别是在干燥过程中,最容易发生裂纹。这个问题很难解决,尽管在原料方面,采取长期困泥、堆存风化、反复冻融、掺瘦化剂,以及在制坯前加强练泥设备,和控制干燥温度,但仍不能彻底消灭裂纹现象。我公司为了解决这一问题于1956年曾创造出用矽酸钠刷瓦坏法,经试验后,效果良好,基本上解决了瓦坏裂纹问题。现将这一经验介绍如下: Clays made of clay in general (especially fat clay) are most prone to cracks during the production process, especially in the drying process. This problem is difficult to solve, although in terms of raw materials, the use of long-term mud, weathering, repeated freeze-thaw, mixed with lean agent, and strengthen the mud equipment before the billet, and control the drying temperature, but still can not completely eliminate the crack phenomenon. In order to solve this problem, in order to solve this problem, our company created a sodium vanadate brushing method in 1956. After the test, the effect was good and basically solved the problem of watt failure. This experience is now described as follows: