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本文应用超声波的传播速度(声速)与TBP-煤油中钍浓度依存关系为原理的声速法检测Thorex流程中有机相的钍浓度。超声波的传播速度是通过测定超声波传播一定距离(声程)所需酌时间(声时)实现的。测定了超声波的声速与有机相的温度、钍浓度、TBP和硝酸浓度等参数关系,除TBP浓度外,均得到了良好的线性关系。温度的声速系数为-3.6米·秒~(-1)/度,钍浓度的声速系数为-0.73米·秒~(-1)/克·升~(-1),硝酸浓度声速系数为-11.8米·秒~(-1)/N。TBP含量在30％附近时,声速系数近似为-0.3米·秒~(-1)/1％。特别重要的是温度的声速系数不受钍浓度的影响。在TBP和硝酸浓度稳定的条件下,TBP-煤油中钍浓度与声速、温度的关系可用下式表示: C_(Th)=1706.3-1.4v-4.9(T-25), 式中,C_(Th)为有机相中钍浓度,克/升;v为声速,米/秒;T为温度,℃。 基于不同钍浓度的温度声速系数相同的特性,本文提出采用“双通道对比法”消除温度对检测钍浓度的影响。实验结果可用下式表示: C_(Th)=C_(Th)标+AΔt, 式中,C_(Th)为测量通道的钍浓度,克/升;C_(Th)标为标准通道的钍浓度,克/升;A为由声程所决定的常数,克·升~(-1)/微秒;Δt为二通道声时差,微秒。 方法的灵敏度与声程有关,当声程为600mm时,灵敏度为0.3克/升。
In this paper, the thoron concentration of organic phase in the Thorex process was measured by the sonic velocity method based on the dependence of the propagation velocity of ultrasonic wave (velocity of sound) and thorium concentration in TBP-kerosene. The speed of propagation of ultrasound is determined by measuring the amount of time (in hours) it takes for the ultrasound to propagate a certain distance (sound path). The relationship between ultrasonic velocity and organic phase temperature, thorium concentration, TBP concentration and nitric acid concentration was determined. The linear relationship was obtained except TBP concentration. The velocity coefficient of sound velocity is -3.6 m · s -1 / degree, the velocity coefficient of thorium is -0.73 m · s -1 / g · L -1, the velocity coefficient of nitric acid concentration is - 11.8 msec -1 (-1) / N. When the TBP content is around 30%, the velocity coefficient of sound velocity is about -0.3 m · s -1 / 1%. Of particular importance is the temperature-dependent sound velocity coefficient independent of thorium concentration. Under the conditions of stable TBP concentration and nitric acid concentration, the relationship between thorium concentration in TBP-kerosene and sound velocity and temperature can be expressed as follows: C Th = 1706.3-1.4v-4.9 T-25, ) For the organic phase thorium concentration, g / l; v for the speed of sound, m / s; T for the temperature, ℃. Based on the same temperature sound velocity coefficient with different thorium concentrations, this paper proposes to eliminate the influence of temperature on the detection of thorium concentration by the “two-channel comparison method”. The experimental results can be expressed by the following formula: C_ (Th) = C_ (Th) standard + AΔt, where C_ (Th) is the thorium concentration of the measurement channel, G / L; A is a constant determined by the sound path, g · L -1 / μs; Δt is the two-channel acoustic time difference in microseconds. The sensitivity of the method is related to the sound path, with a sensitivity of 0.3 g / l at a sound path of 600 mm.