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A method for rapidly detecting the concentration of ammonium nitrate solution
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A technology of ammonium nitrate solution and concentration, applied in the field of inspection, can solve the problems of large measurement error, easy crystallization, and long time consumption, and achieve the effects of low detection cost, simple operation, and accurate detection results
Active Publication Date: 2016-03-02
ANHUI LEIMING CHEM CO LTD
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The oven drying method is to place the sample in an oven, dry it to a constant weight under a certain temperature condition, weigh the weight before and after drying, calculate the weight ratio, and obtain the solution concentration. Although the measurement result is relatively accurate, but It takes a long time, usually more than 2 hours
The principle of the specific gravity method is to measure a certain amount of sample, dilute it with distilled water, measure the density P and temperature t of the diluted sample, find out the concentration of the diluted ammonium nitrate aqueous solution according to the P-t table, and then convert it into the concentration of the sample ammonium nitrate aqueous solution. The disadvantage of the method is that the aqueous ammonium nitrate solution with a concentration of more than 90% is prone to crystallization, and the measurement error is large, which is not conducive to product quality control.
The formaldehyde method is commonly used in chemical analysis, and its disadvantages are: although the measurement results are accurate, it takes a long time, and it is exposed to the toxic and harmful substance formaldehyde.
This method is suitable for fixed facilities containing ammonium nitrate solution, but it is not suitable for transport vehicles that transport raw materials of ammonium nitrate solution
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Embodiment 1
[0021] Embodiment 1 makes ammonium nitrate aqueous solution concentration, crystallization point temperature comparison table
[0024] (2) In the laboratory, weigh out the solid ammonium nitrate and water to configure the ammonium nitrate standard solution with the required concentration, pour it into a 250ml Erlenmeyer flask, and heat until completely dissolved;
[0025] (3) Put the thermometer through the rubber stopper into the conical flask, so that the temperature-sensing bulb at the end of the thermometer is immersed in the solution, but does not touch the bottom of the bottle; then plug the stopper, and shake the conical flask to make the solution fully Shake well, then allow the solution to cool down slowly;
[0026] (4) Observe the solution every 1-2 seconds, and pay attention to the appearance o...
Embodiment 2
[0031] A tank of ammonium nitrate solution delivered by XX Fertilizer Factory. The temperature of the solution is 123°C. Follow the steps below to check the concentration of the solution:
[0032] Step 1: Prepare testing instruments: one 250ml Erlenmeyer flask, one 1000ml beaker and one 0-150°C thermometer, wash them clean.
[0033] Step 2: Sampling: Use a 1000ml beaker to take about 200ml of the solution at the liquid inlet, and pour it into a conical flask (about 2 / 3 of the volume).
[0034] Step 3: Put the thermometer through the rubber stopper into the Erlenmeyer flask, so that the temperature-sensing bulb at the end of the thermometer is immersed in the sample, but does not touch the bottom of the flask. Then stopper the flask, shake the flask vigorously to shake the solution well, and let the solution cool down slowly.
[0035] Step 4: Observe the solution every 1-2 seconds, pay attention to the appearance of small needle-shaped ammonium nitrate crystals, when the first...
Embodiment 3
[0039] A tank of ammonium nitrate solution delivered by XX Chemical Fertilizer Factory. The temperature of the solution is 134°C. According to steps 1 to 4 in Example 2, the crystallization point of the solution is 110°C. Compare the concentration of ammonium nitrate aqueous solution and the crystallization point temperature. Standard comparison table, the concentration of the tested solution is 92.82%.
[0040] Take the remaining ammonium nitrate solution and use the oven drying method to measure the concentration of the solution to 92.72%, and the measurement results are qualified.
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Abstract
The invention discloses a method for quickly detecting the concentration of an ammonium nitrate solution. Using the principle that different concentrations of ammonium nitrate solutions correspond to different crystallization point temperatures, the temperature of the ammonium nitrate solution is lowered in a transparent container, and the temperature at which the crystallization point appears is visually observed. The concentration of the measured solution can be obtained by comparing the concentration of the ammonium nitrate solution and the crystallization point temperature standard comparison table. This method is simple to operate, easy for general staff to master, and can be operated at the sampling site; the detection time is about 2 minutes, which is convenient and fast; the instruments used are ordinary beakers, Erlenmeyer flasks and thermometers, and there is no investment cost; the detection results It is relatively accurate and can fully meet the requirements of factory inspection; it is not only suitable for the incoming inspection of high-concentration ammonium nitrate solution of raw materials for industrial explosive production, but also suitable for on-site quality control of the concentration of aqueous phase solution for industrial explosive production.
Description
technical field [0001] The invention relates to a test method, in particular to a method for the concentration of ammonium nitrate solution, the main raw material for industrial explosive production. Background technique [0002] Ammonium nitrate is one of the most important raw materials for industrial explosives. Two years ago, the production of industrial explosives basically used the direct purchase of solid ammonium nitrate, which was formed after multiple processes such as handling, unpacking, crushing, heating, and dissolution. Aqueous solution; when ammonium nitrate manufacturers manufacture solid ammonium nitrate, they first produce ammonium nitrate aqueous solution, and then produce solid ammonium nitrate after one, two, and three stages of evaporation, crystallization or granulation, metering, and bagging. Repeated processing like this has not only caused great waste of both electric energy and heat energy, has increased the operation of multi-channel repeated pro...
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