Automatic and quick measurement method and device of high-concentration silicate

Abstract

The invention discloses automatic and quick measurement method and device of high-concentration silicate, belonging to the technical field of chemical analysis and quantification and used for water quality analysis and monitoring. The method comprises the following steps of: enabling a water sample and a polymeric silicon conversation liquid to enter a premixing coil pipe in a thermostatic system under the action of a pump to convert inert silicon in the water sample into active silicon, and then entering a first sample quantifying ring; enabling a color developing agent to enter a first color developing agent quantifying ring; simultaneously, pushing the water sample in a second sample quantifying ring and the reagent in a second color developing agent quantifying ring into a reaction coil pipe respectively by two carrying currents to react, measuring the absorbency value of the product by a circulating photometric detector, and processing the actual measurement result by a recording instrument or a computer. The collection, the quantification and the measurement of the sample and the color developing agent are carried out synchronously.

Description

High-concentration silicate automatic and rapid determination method and device technical field The invention relates to an automatic and rapid determination method for high-concentration silicate and a measurement device for realizing the method, belonging to the technical field of chemical analysis and quantification. It is suitable for the rapid determination of silicates in water. Background technique After the geothermal water or geothermal steam is used in the geothermal power plant, the wastewater is generally recharged underground through the recharge well. Because the geothermal water contains high concentration of silicate, during the recharge process, as the temperature and pressure drop, the liquid evaporates , causing the silicate contained in the water to reach a supersaturated state, resulting in the precipitation of silica scale and attachment to the wall of the reinjection well. Moreover, as the depth of the reinjection well increases, the thickness of th...

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Problems solved by technology

This method has the following disadvantages: 1) the maximum determination limit is 100mgL-1, which cannot be directly used for the quantification of high-concentration silicate in geothermal water samples, and can only be measured after the sample is pre-diluted; 2) there is a Special-purpose chromogenic reagent pipeline, the reagent in this pipeline is always in a flowing state, resulting in a large consumption of chromogenic reagent in this method, which also increases the waste discharge of the instrument and pollutes the environment; 3) carrier liquid Both reagents and reagents must be degassed in advance, which increases the complexity of the system; 4) the analysis speed is slow, only 30 samples h-1; 5) the system uses an air bath (Ab) and a water bath (Wb) device, the temperature is respectively 145°C and 90°C will cause air bubbles to be easily generated in the pipeline, which will affect the precision and accuracy of the measurement results; 6) The pressure in the system reaches 8-10kg / cm2, and a plunger pump must be used to pump the carrier fluid and reagents smoothly. The instrument cost is greatly increased

7) The system has no ability to mask or eliminate the interference of phosphorous molybdenum yellow

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