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A kind of detection method of fineness of fine powder

A detection method and technology for fine powder, applied in measuring devices, particle size analysis, scientific instruments, etc., can solve the problems of large deviation of test results, high laboratory requirements, and large water content in water sieve residues. Simple, low requirements for instruments and testing conditions and environment, and the effect of reducing labor intensity

Active Publication Date: 2018-04-13
濮阳泓天威药业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the air jet method uses an airflow sieve or a negative pressure sieve, which is expensive and has high requirements for the laboratory
Another test method is the water sieve-sieve residue weight weighing method. This test method is to weigh a certain amount of fine powder to be tested and pour it into the specified analysis sieve, rinse it with water, and pour the residue on the sieve into the surface. Dry and weigh in an oven at 40-60°C or 105±5°C (the drying temperature of calcium sulfate dihydrate is 40-60°C, and the drying temperature of calcium carbonate is 105±5°C), and the percentage of residue can be calculated; Or take a certain amount of fine powder to be tested, first dry it in an oven at 40~60°C or 105±5°C, then pour it into a sieve, mechanically vibrate and sieve for a certain period of time, and then pour the residue on the sieve Put it into a watch glass and weigh it, and you can calculate the percentage of each mesh residue. This method contains a lot of water in the water sieve residue, and the drying time is long (4-6 hours), and if the drying temperature is not controlled uniformly, dihydrate gypsum Evaporation of crystal water in substances containing crystal water will cause large deviations in test results
When sieved with water, the solute has a certain solubility in water, resulting in detection errors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of detection method of the fineness of calcium sulfate dihydrate fine powder of 240 orders, comprises the following steps:

[0033] (1) Weigh 50.0g of calcium sulfate dihydrate with an electronic balance, transfer it to a graduated cylinder, add a saturated solution of calcium sulfate dihydrate, and make the saturated aqueous solution exceed the height of all fine powder interfaces by 3~5cm. Shake and mix evenly, then place the graduated cylinder vertically, let the sample settle naturally for 30 minutes, and read the wet volume V occupied by the sample 0 51.0ml;

[0034] (2) Weigh 50.0g of calcium sulfate dihydrate with an electronic balance, pour it into a 240-mesh standard sieve, and keep the sieve gently shaking to make the fine powder under the 240-mesh sieve in the calcium sulfate dihydrate sample Through the sieve, when the collected saturated flushing water does not contain calcium sulfate dihydrate fine powder (indicating that the calcium sulfate dihydr...

Embodiment 2

[0039] A method for detecting the fineness of calcium sulfate dihydrate fine powder with 600 orders, comprising the following steps:

[0040] (1) Weigh 100.0g of calcium sulfate dihydrate with an electronic balance, transfer it to a graduated cylinder, add a saturated solution of calcium sulfate dihydrate, and make the liquid level exceed the height of all fine powder interfaces by 3~5cm. Shake and mix evenly, then place the graduated cylinder vertically, let the sample settle naturally for 40 minutes, and read the wet volume V occupied by the sample. 0 104ml;

[0041] (2) Weigh 100.0g of calcium sulfate dihydrate with an electronic balance, pour it into a 600-mesh standard sieve, wash the screen with a saturated aqueous solution of calcium sulfate, the flow rate of the water flow is 120ml / min, and shake the screen gently constantly to make dihydrate sulfuric acid The fine powder under the 600-mesh sieve in the calcium sample passes through the sieve, and when the collected s...

Embodiment 3

[0046] A method for detecting the fineness of 400 mesh calcium sulfate dihydrate fine powder, comprising the following steps:

[0047] (1) Weigh 50.0g of calcium sulfate dihydrate with an electronic balance, transfer it to a graduated cylinder, and add a saturated solution of calcium sulfate dihydrate. Shake and mix evenly, then place the graduated cylinder vertically, let the sample settle naturally for 38 minutes, and read the wet volume V occupied by the sample 0 51.2ml;

[0048] (2) Weigh 50.0g of calcium sulfate dihydrate with an electronic balance, pour it into a 400-mesh standard sieve, rinse the screen with saturated calcium sulfate aqueous solution, add water at a flow rate of 120ml / min, and shake the screen gently constantly to make the dihydrate The fine powder under the 400-mesh sieve in the calcium sulfate sample passes through the sieve, and when the collected saturated flushing water does not contain calcium sulfate dihydrate fine powder (indicating that all th...

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PUM

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Abstract

The invention discloses a method for detecting the fineness of fine powder. First, the sample to be tested is added into a graduated container, and then a certain amount of saturated aqueous solution of the sample to be tested is added. After natural settlement, the wet volume of the sample to be tested is V0; The quality sample is added to the standard sieve, and the sieve is washed with the saturated aqueous solution of the sample. After the fine powder under the sieve passes through the sieve, the sieve is transferred to a graduated container, and the saturated aqueous solution is added. After natural settlement, the sieve is tested. The wet volume is V1; calculate the fine powder retention rate V1 / V0 corresponding to the sample. The method uses the saturated aqueous solution of the sample and does not need to be dried, and has the advantages of simple operation, time saving, accurate data and low investment, and can achieve the purpose of accurately and rapidly detecting the fineness of the fine powder.

Description

technical field [0001] The invention belongs to the technical field of detection methods for the fineness of solid materials, and in particular relates to a quantitative detection method for the fineness of fine powder. Background technique [0002] Calcium sulfate dihydrate [Ca(SO) 4 2H 2 O] contains two crystal waters, and the crystal water accounts for 18~22%. Calcium sulfate is insoluble in water, the solubility is 0.19g / 100g water at 10°C, and 0.21g / 100g water at 40°C. Medium and high-grade calcium sulfate is mainly used in food, medicine, chemical industry, paint, beer fermentation, cement, edible fungi, fertilizer granulation, food additives, chemical fillers, etc. Calcium sulfate dihydrate is a pharmaceutical excipient in medicine, which can be used as a pharmaceutical diluent, filler and carrier. When used as a diluent or carrier for pharmaceutical excipients as granules, the fineness of calcium sulfate dihydrate has a very important impact on the uniformity of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02
Inventor 孙春领黄振锋孙玉洁张永旺徐霞周超郑记栓赵军飞陈文成刘趁俭牛秋丽李君领郭燕军韩振国
Owner 濮阳泓天威药业有限公司