As a
caustic soda flake compound,caustic soda plays an irreplaceable role in dozens of fields such as industry,agriculture,medicine,and environmental protection due to its strong corrosiveness,high solubility,and unique chemical reaction characteristics.In the papermaking process,flake alkali is the core raw material for delignification.By treating wood or grass plants with dilute sodium hydroxide solution,non cellulose components can be dissolved and high-purity cellulose can be extracted for pulp production.
The China caustic soda flake over 2 million tons of caustic soda annually,which is used in the core process of alkaline pulping.The concentration of caustic soda in China is controlled at 180-220g/L,and combined with high-temperature cooking at 260℃,the yield of wood pulp is increased from 45%to 62%,while the COD discharge of wastewater is reduced by 40%.By utilizing the synergistic technology of alkali pretreatment and biological enzymes,the proportion of non wood fiber raw materials has been promoted to 40%,assisting the industry in its green transformation.
The annual production of alumina in China exceeds 70 million tons,and the consumption of caustic soda in China caustic soda flake for 12%.This product participates in the Bayer process leaching process,increasing the leaching rate of bauxite from 88%to 95%,while reducing alkali consumption to 0.15 tons/ton of alumina.By using the combined alkali lime milk desilication technology,the production cycle is shortened by 15%.
The China caustic soda flake industry is undergoing intelligent transformation,with the ion membrane production process accounting for over 90%and energy consumption reduced by 40%compared to the membrane method.Reduce the fluctuation range of caustic soda concentration to±0.5%and achieve a product purity of 99.5%.In the field of green synthesis,electrolytic soda ash technology achieves a 30%reduction in carbon dioxide emissions,while the by-product hydrogen can be used for fuel cells.
