40results about How to "Simple crystallization process" patented technology

The invention provides a crystallization process of polycrystalline silicon and an ingot casting process of polycrystalline silicon. The crystallization process comprises the following steps: when a silicon material is in the state of coexistence of solid silicon and liquid silicon, the temperature of the top of an ingot furnace is kept so as to continuously melt solid silicon, and the temperature of the top in the ingot furnace is gradually lowered to enable the liquid silicon to be subjected to recrystallization to form the polycrystalline silicon ingot. The crystallization treatment is performed to the liquid silicon, when the silicon material is in the state of mixing of solid and liquid, so the temperatures of liquid silicon in all the ingot furnaces are basically the same, latent heat of the liquid silicon is the same, and therefore the crystallization velocity of the liquid silicon is enabled to be stable, the crystallization stability of liquid silicon is improved, and the properties of solar cells manufactured by the polycrystalline silicon ingot is improved. Meanwhile, the crystallization process of the polycrystalline silicon has the characteristics of simple process and high production efficiency.

The invention discloses a cefodizime sodium compound solid, a method for preparing the same and a pharmaceutical preparation of the cefodizime sodium compound solid, wherein the method for preparing the cefodizime sodium compound solid comprises the following steps of: first, dissolving crude cefodizime sodium salt in an acetone aqueous solution, then adding activated carbon to adsorb and filter, cooling the filtrate, stirring to separate the solid out, adding an acetone solvent to separate the solid out, filtering and drying, thus obtaining the cefodizime sodium compound solid. The prepared compound solids are fine particles, and have uniform particle size distribution and good liquidity, the crystallization technology is simple, the residual amount of organic solvent is low, and the product stability and pharmaceutical safety are effectively improved.