CAJ | 학술논문

铬酸钠碱性液中铝的脱除和铝化合物的利用是实现铬盐产品清洁生产的重要步骤。讨论铬酸钠对中和过程、氢氧化铝沉淀效率和氢氧化铝结晶诱导期的影响。结果表明：与高浓度铝酸钠相似，铬酸钠碱性液中铝酸钠的中和曲线也分为明显的3个区域。在相同铝浓度的溶液中，络酸钠碱性液中铝酸钠的诱导期比纯铝酸钠溶液的诱导期更长。温度和二氧化碳体积分数的降低有利于形成较为粗大的氢氧化铝颗粒。在温度为50~70°C，二氧化碳浓度为28.5%(体积分数)时，氢氧化铝主要为拜耳铝石型，由棒状和圆台状的聚集体组成。颗粒尺寸(d50)在24.2μm 到29.3μm之间，杂质较少，有利于产品的综合利用。
락산납감성액중려적탈제화려화합물적이용시실현락염산품청길생산적중요보취。토론락산납대중화과정、경양화려침정효솔화경양화려결정유도기적영향。결과표명：여고농도려산납상사，락산납감성액중려산납적중화곡선야분위명현적3개구역。재상동려농도적용액중，락산납감성액중려산납적유도기비순려산납용액적유도기경장。온도화이양화탄체적분수적강저유리우형성교위조대적경양화려과립。재온도위50~70°C，이양화탄농도위28.5%(체적분수)시，경양화려주요위배이려석형，유봉상화원태상적취집체조성。과립척촌(d50)재24.2μm 도29.3μm지간，잡질교소，유리우산품적종합이용。
In order to clean production of chromium compounds, it is a critical process to remove aluminates and utilize aluminum compounds from artificial chromate alkali solutions. The effects of Na2CrO4 on the neutralization curve, Al(OH)3 precipitation efficiency and induction period of bayerite were investigated. The results indicate that the neutralization curve of the artificial chromate alkali solutions shows three distinct regions and its induction period is longer than that of pure sodium aluminate solutions at the same aluminum concentration. And the decreased temperature and volume fraction of CO2 enhance the particle size of bayeriteβ-Al(OH)3. Bayerite composed of agglomerates of rods and cone frustums was obtained from alkali metal chromate solutions with 28.5% CO2 (volume fraction) at temperatures ranging from 50 °C to 70 °C. Coarse bayerite with particle size (d50) from 24.2μm to 29.3μm extremely has few impurities, which is suitable for comprehensive utilization.