Manufacturing method of 74% calcium chloride powder
I. INTRODUCTION
Calcium chloride is a widely used chemical, especially in food, medicine, construction and industry. Among them, 74% calcium chloride powder is a common specification with various manufacturing methods. One of the manufacturing methods will be described in detail in this paper.
II. MATERIALS AND EQUIPMENT
1. Material: calcium stone, hydrochloric acid, water
2. Equipment: crusher, ball mill, stirring reactor, centrifuge, dryer, sieving machine, packaging machine
III. MANUFACTURING STEPS
1. CRUSHING AND GRINDING: Calcium stone is crushed to the appropriate size, and then put into the ball mill to grind into powder.
2. Dosing: Add calcium stone powder and hydrochloric acid into stirring reactor according to a certain proportion, and add appropriate amount of water at the same time.
3. Reaction: Turn on the stirred reactor, control a certain temperature and reaction time, so that the calcium stone powder and hydrochloric acid fully react to generate calcium chloride and carbon dioxide gas.
4. Centrifugal separation: Pour the reaction liquid into the centrifuge, and separate the calcium chloride slurry and unreacted solid impurities by centrifugal action.
5. Drying: The calcium chloride slurry is poured into a dryer and the water is evaporated by heating to obtain calcium chloride wet powder.
6. Sieving: Use sieving machine to sieve the calcium chloride wet powder into the specified particle size range.
7. Packing: Put the sieved calcium chloride powder into packing bag, seal and mark.
4. Precautions
1. Pay attention to safety during operation, avoid contact with skin and inhalation of dust.
2. Control the reaction temperature and time to ensure complete reaction.
3. Clean up the centrifuge in time during centrifugal separation to avoid the accumulation of impurities affecting the separation effect.
4. Control the heating temperature and air volume during drying to avoid lumping of calcium chloride powder.
5. Keep the screen mesh clean during the screening process and check the screen mesh wear regularly to avoid affecting the screening effect.
5. Quality control
In order to ensure the quality of 74% calcium chloride powder, the following aspects of quality control are needed:
1. Raw material control: quality inspection of raw materials such as calcium stone and hydrochloric acid, to ensure that they meet the relevant standards.
2. Process control: During the manufacturing process, quality control is carried out for each step to ensure that each process parameter meets the requirements.
3. Finished product inspection: Quality inspection of the made 74% calcium chloride powder, including purity, particle size, moisture and other indicators, to ensure that it meets the relevant standards and customer requirements.
VI. Environmental protection and waste treatment
In the process of manufacturing 74% calcium chloride powder, some waste will be produced, such as unreacted solid impurities and carbon dioxide gas. In order to ensure environmental protection and safe production, the following treatments are required:
1. Unreacted solid impurities can be further processed to extract useful components or be safely landfilled.
2. Carbon dioxide gas can be treated by absorbing it through absorbents or introducing it into the flue gas to minimize the impact on the environment.
VII.CONCLUSION
With the above manufacturing methods and precautions, we can successfully manufacture 74% calcium chloride powder. During the whole process, we need to pay attention to safety, quality control and environmental protection to ensure the quality of the product and the safety of production. Meanwhile, we also need to keep exploring and optimizing the manufacturing methods to improve the production efficiency and quality, so as to meet the needs of customers and the competitive requirements of the market.
