The concentration of flake alkali determines the price of the product. The higher the concentration, the higher the price of the product, and the less impurities it contains. So what factors will affect the concentration of schistine? This is generally affected by some systems, equipment, concentration process and other factors in the production process. The specific factors that affect the concentration of flake alkali will be understood later.

什么因素会影响片碱的浓度?

What factors will affect the concentration of schistine?

(1)蒸发系统负荷对片碱浓度的影响。

(1) Influence of production load of evaporation system on the concentration of flake alkali.

Ⅱ效蒸发器的碱液温度应控制在(143+1)C,碱质量分数为50%~51%。校验了工艺控制点对应的仪表,连续检测了Ⅱ效蒸发器的工艺数据,结果显示50%碱温度、浓度均在工艺要求范围。说明蒸发系统是稳定的,对后期的片碱浓度没有影响。

The alkali liquor temperature of the second effect evaporator should be controlled at (143+1) C, and the alkali mass fraction should be 50%~51%. The instrument corresponding to the process control point was calibrated, and the process data of the second effect evaporator were continuously detected. The results showed that the temperature and concentration of 50% alkali were within the process requirements. It shows that the production of evaporation system is stable and has no effect on the concentration of flake alkali in the later stage.

(2)蒸汽进入熔融碱沿线的设备、管道、影响了碱浓度。

(2) Steam enters the equipment and pipelines along the molten alkali, affecting the alkali concentration.

更终浓缩器、熔融碱罐、片碱机及熔融碱管道,在工艺设计上均采用中压蒸汽伴热,如果阀门泄漏,蒸汽可能进入熔融碱系统,这样就会导致片碱浓度降低。为此打开终浓缩器蒸汽包封,对熔融碱罐、片碱机及熔融碱管道进行蒸汽吹扫，未发现蒸汽泄漏。为此,排除了蒸汽阀门内漏对片碱浓度造成的影响。

The final concentrator, molten alkali tank, flake alkali machine and molten alkali pipeline all adopt medium pressure steam heat tracing in process design. If the valve leaks, the steam may enter the molten alkali system, which will lead to the reduction of flake alkali concentration. For this reason, the steam envelope of the final concentrator was opened, and the molten alkali tank, flake alkali machine and molten alkali pipeline were steam purged, and no steam leakage was found. Therefore, the influence of internal leakage of steam valve on the concentration of flake caustic soda is eliminated.

(3)更终浓缩器碱负荷对片碱浓度的影响。

(3) Effect of final concentrator alkali load on flake alkali concentration.

为保证片碱浓度,进行了如下调整:①增加熔盐在终浓缩器进口和出口的温度差;②保证负荷在设定(3.3m/h)范围内;③提高熔盐温度,将原设计的熔盐炉出口温度由425C提高到427C，片碱质量分数由98.5%提高99.3%。通过时间的观察,发现提高片碱浓度后片碱结块现象并无明显改善。

In order to ensure the concentration of flake alkali, the following adjustments were made: ① increase the temperature difference between the inlet and outlet of the final concentrator; ② Ensure that the production load is within the set range (3.3m/h); ③ Increase the molten salt temperature, increase the outlet temperature of the original designed molten salt furnace from 425c to 427c, and increase the mass fraction of flake alkali from 98.5% to 99.3%. Through the observation of time, it was found that the agglomeration of flake alkali was not significantly improved after increasing the concentration of flake alkali.