Dongguan Yongtu Nanotechnology Co., Ltd.

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Quality control

Working instruction for grinding medium density test

 

I. purpose of operation

 

Test the density of grinding medium, detect the performance of grinding medium, and determine whether the product density index is qualified.

 

Two. Operation tools

 

Electronic balances, thermometers, plastic measuring cups, volumetric flasks, dishcloth, roll paper.

 

Three. Preparation and confirmation before homework.

 

1. open the electronic balance and preheat the 30min.

 

2. Use 2L plastic measuring cup to prepare the water needed for testing density. The water should be kept for a period of time to ensure that the water temperature will not change during the measurement.

 

3. prepare the 100ml volumetric flask for testing density and wipe and roll paper needed for cleaning the volume bottle.

 

4. confirm that the grinding media are dry and cool.

 

Four, operation process

 

1. Pour the prepared water into the capacity bottle, rub the volume bottle with your hands, exhaust the bubbles in the capacity bottle, then cover the lid of the capacity bottle, wipe the water left on the wall and the mouth of the bottle with a dry rag, and then wipe it with a roll of paper to ensure that the water is clean.

 

2. Peel the electronic balance, put the clean-wiped capacity bottle on the electronic balance, and record the weight M1 of the capacity bottle.

 

3. Using electronic balance to weigh a certain number of grinding media to be measured, generally weighing the weight of 130g or so, at this time record the weight of grinding media is M2.

 

4. Pour the weighted grinding medium into the capacity bottle containing about 30 ml water, rub the volume bottle by hand, drain the bubbles in the capacity bottle, then cover the cap of the capacity bottle, wipe the water left on the wall of the capacity bottle and the mouth of the bottle with a dry rag, and then wipe it again with a roll of paper to ensure that the water is wiped. Clean.

 

5. Peel the electronic balance and place the clean-wiped capacity bottle on the electronic balance. Record the total weight of the capacity bottle and the grinding medium M3.

 

6. calculate the density of grinding medium.

 

The density formula is M2/ (M1+ M2- M3) * water, and the density coefficient of water is in the table of water temperature and density.

 

Five, matters needing attention

 

1. density test must ensure that the water temperature can not change too much.

 

2. when weighing the volumetric flask, ensure that the water on the volumetric flask is cleaned.

 

3. The bubbles in the volumetric bottle must be removed, otherwise the test results will be deviated, affecting the quality of the judgment.

 

Six. Safe operation procedures

 

1. the flask must be handled gently when used, preventing the volume bottle from crashing due to overexertion.

 

2. When pouring the grinding medium into the volumetric bottle, it must be poured slowly to avoid the grinding medium falling into the volumetric bottle and smashing the volumetric bottle.

 

3. prevent water from splashing into the electronic balance to damage the balance when pouring water into a volumetric flask.