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Pneumatic system for transferring fine sand particles
Q: Can you send me details about a pneumatic system for transferring grinded fine sand particles?
A: I'm not familiar with any specific "grinded fins sand" plants. However, the only problem with pneumatic conveying of sand is the erosion, especially elbows. I've seen people using concrete and the HammerTek elbows were developed by a guy transporting sand and gravel materials.
Here are more of the latest questions on: Solids Processing
Why are there lumps during mixing?
We are producing a powder product in batch and the problem is there are lumps in the final product. When I check the raw material, it is in powder form and most of it can pass through Mesh 810 micron. The lump isn't made up of all raw materials in the mix. It comes from one raw material that does not have hydroscopic problem. Even though that raw material is crushed before mixing, the lumps still happen.
Also, I would like to know how long the mix time should be when we are dealing with raw material that has hydroscopic. Can heat be generated if the time of mixing is longer? Does the sequence of mixing of raw material affect the final product?
Will thermal dispersion units separate the 'stickies'?
I am working in a paper mill. My co-worker wants to know about thermal dispersion units and how he can use it there to separate stickies from wood.
How to Avoid a Break in the Main Shaft Screw
We have a twin screw conveyor for transferring Na2SO4 as per spec data below. To avoid a break in the main shaft screw, I would like to install a torque limiter for safety device. What is your opinion and is there a best way to do this? Is there any torque limiter product that accommodates our screw design?
See the data below:
Product to be handled: Sodium sulphate (salt)
Chemical formula: Na2SO4
Density at 20 degree C: 2700 kg/M3
Bulk density: 1500 kg/M3
Shape of particles: Rhombic
Sieve analysis:
- above 0.1 mm: 70% by weight
- 0.06 – 0.1 mm: 15% by weight
- below than 0.06 mm: 15% by weight
Average particle size: 0.18 mm
Specific particle surface area: 68 M2/kg
Total throughput: 6000 kg/hrs dry salt, 6250 kg/hrs wet salt
Temperature: 40 degree C
Residual moisture: 3% - 4% by weight
Material of construction:
- all wetted parts: SS 316L
- all non wetted parts: SS 316L
Speed of screw conveyor: Fixed 36 rpm
Electrical data: 380/680 V, 50 Hz, IEC standard, IP 53, non explosion proof, F insulation class
Spec for geared motor: SEW EURO drive R107DV132M4, 7.5 KW, 36 rpm
Can you recommend formulas for calculating power consumption?
Can you recommend a formula or a reference to calculate power consumption for a screw conveyor and a pulverizer?
Decreasing Filtration Time
Our plant is currently investigating methods to decrease filtration time for one of our products. The process involves a neutralization reaction in which Calcium Salt of Dodecylbebzene Sulfonic Acid is formed. Sulfuric acid also exists in the raw materials, which leads to a secondary reaction that yields calcium sulfate. It is the calcium sulfate that is removed during filtration. Currently, a filter press is employed for the removal of the CaSO4. We are hoping to employ some type of agglomeration technique to improve the filtration rate.
