How much excess sodium carbonate is generally appropriate in refined brine?
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This post was last edited by sunjl1981 on January 7, 2013, at 00:02. How much excess sodium carbonate is appropriate in refined brine? Will a relatively high content of it have any effect on the resin? # + + .
Our excess sodium carbonate is 0.3~0.4 g/l
For our company, it’s: 0.3-0.5g/L. It’s probably more or less the same、、
In our unit, even when the concentration of sodium carbonate is within the range of 0.3–0.5 g/L, the levels of calcium and magnesium still exceed the standards. What could be the reason for this?
Our facility maintains the sodium carbonate concentration at 0.3–0.6 g/L. If the levels of calcium and magnesium exceed the limits, the brine exiting the resin tower fails to meet process specifications, thereby affecting current efficiency. Generally, the calcium and magnesium content at the membrane outlet is less than 10 mg/L.
What do you base your control on? How to achieve stable control? How to handle the constantly changing calcium and magnesium in salt
0.3-05, DCS system control
In our facility, control is achieved as follows: between the pressurized tank and the preprocessor, there is a control valve and a flow meter. There is also a flow meter and a control valve in the system for adding sodium carbonate. Similarly, in the feed line for ferric chloride, there are a flow meter and a control valve. Based on the readings from these flow meters, when the concentration of sodium carbonate reaches 30–50 g/L, the computer automatically controls the valves, thereby achieving our desired result.
Reply to #6: Qingfeng Xulai 0.0 What effects would it have if the amount of excess sodium carbonate in the saltwater were increased?
Reply to 8# ysy_jing: Does “30-50g/l of sodium carbonate” refer to the amount added to the brine or the excess amount? What effects will excessive amounts have? Will it have any impact on the resin tower?
a. Except for Ca2+, sodium carbonate solution is added to the brine so that it reacts with Ca2+ in the brine to form insoluble calcium carbonate precipitate. The reaction equation is as follows: Ca2+ + CO32− → CaCO3↓. To completely remove Ca2+, the amount of sodium carbonate added must exceed the theoretical requirement indicated by the reaction equation. In this process, the excess amount of sodium carbonate is controlled at 0.3–0.5 g/L.