Excess alkali in brine

The control of the excess alkalinity in brine should be determined based on specific circumstances. Generally, it is appropriate to control the excess alkali content at 0.5%-1% in the brine solution. However, the specific values need to be determined based on factors such as the saltwater formula, production process, and product requirements. Fluctuations in the dual-alkali index are mainly caused by factors such as raw material quality, operating techniques, and equipment condition. To address the issue of difficult control over fluctuations in the dual-alkali indicators, actions can be taken from the following aspects: 1. Optimize raw material selection: Choose high-quality raw materials and strictly control the quality of these materials as well as the accuracy of their proportions. 2. Strengthen production process management: Establish a comprehensive production process management system that covers aspects such as operating procedures, equipment maintenance, and operator training, to ensure that each step is carried out correctly. 3. Strengthen equipment maintenance: Regularly inspect, maintain, and service the equipment to ensure its stable and accurate operation. 4. Establish a quality control system: Set up a comprehensive quality control system that includes the inspection of raw materials, intermediate products, and final products, in order to identify problems promptly and take appropriate actions. 5. Introduction of advanced automation control technology: By utilizing advanced automation control technology, real-time monitoring and adjustment of the alkalinity level in the brine can be achieved, thereby enhancing the stability and controllability of the production process. Through the comprehensive application of the above measures, fluctuations in the alkalinity level of brine can be effectively controlled, thereby improving product quality and production efficiency. .

Sodium hydroxide 0.1-0.3, sodium carbonate 0.3-0.5

A certain degree of variation in the amount of excess alkali during the saltwater purification process is normal, but a specific range of variation is specified in the standard process specifications. To control the excess alkali level, an online excess alkali analyzer is generally required, as it is impossible to accurately determine the extent of excess alkali based solely on pH measurement. For domestic online alkali excess analyzers, the products of Jiangsu Yimai Technology are the top choice; their performance is on par with that of Wantong’s products, yet their price is less than half of Wantong’s.

Sodium hydroxide is adjusted based on the pH meter, while sodium carbonate is adjusted according to the analysis results. To maintain stable alkalinity, the preparation of brine water is crucial. The composition of the brine solution should be as stable as possible, and the delivery of water from resin column regeneration and water obtained from salt sludge filtration should be as smooth as possible. Quality control in the preparation of sodium carbonate solutions is crucial.

The amount of excess alkali is determined primarily based on the characteristics of the salt used by the company itself. As a general guideline, it is recommended to keep the excess sodium hydroxide at 0.2–0.4, and excess sodium carbonate at 0.4–0.6. Each company will make adjustments accordingly based on the calcium and magnesium levels after treatment. Regarding fluctuations, it is advisable to use a larger buffer tank for the primary brine in order to ensure stable water quality.