Why is sodium carbonate added twice to salt water?
Thread Content
In the primary brine process, sodium carbonate is added once to the baffle trough of the salt treatment tank to remove calcium ions, and sodium carbonate is added to the post-reaction site. Why not add excess sodium carbonate directly to the baffle trough of the salt treatment tank and use the post-reaction site as a backup?
We only add sodium carbonate to the rear reaction barrel, and only sodium hydroxide to the baffle tank of the salt tank.
The crude brine enters the crude brine tank after adding sodium and caustic soda solution through the baffle tank. Use a pressure pump to pressurize the crude brine and send it through a soda-water mixer into a pressurized gas tank. The compressed air in the air buffer tank passes through the pressurized gas tank to keep the pressure of the pressurized gas tank at 0.2~0.3MpG. The salt water coming out of the pressurized gas tank adds FeCl3 to the pre-pressurized gas tank through the Venturi mixer. Processor (V-405), floating mud is discharged from the top in the pre-processor, larger particles sink into the sediment hopper, and the clear liquid flows out from the clear liquid outlet into the rear reaction tank. At the same time, Na2CO3 is added, and the overflow from the reaction tank enters the buffer tank. The brine in the buffer tank flows through the position difference and enters the Kaimembrane filter. The filtered qualified brine is added with an appropriate amount of hydrochloric acid (to maintain the pH of the brine). 9-10) Add Na2SO3 into the baffle tank into the primary brine storage tank, and use the primary brine pump (P-409A/B) to pump in secondary brine. ——This is the current mainstream process for caustic soda primary brine.
I just want to know why two places are designed to add sodium carbonate. In actual production, it is usually added at the rear reaction tank, and the over-alkali amount of sodium carbonate is controlled. Almost no or less sodium carbonate is added in the salt tank.
Does your company add sodium carbonate once to the baffle tank of the salt pool to remove calcium ions, and then add sodium carbonate to the post-reaction site? Is the industrial salt or brine used by your company, and what is the calcium and magnesium content? Is it a high ratio of calcium to magnesium?
h1632135 Is the original poster still there? Please explain clearly the company's process, various indicators, and equipment capabilities. I especially want to find out whether sodium carbonate is added to the baffle trough?