Continuous preparation method of refined brine

Abstract

The invention discloses a continuous preparation method of refined brine, comprising the following steps: continuously mixing raw materials, continuously removing magnesium, continuously removing calcium, conducting continuous precipitation, and naturally collecting and discharging precipitates, wherein brine is subject to continuous reaction, continuous precipitation, continuous clarification and other technology to prepare the refined brine, so that a novel technology of continuous purifying the brine is realized, the concentration of each ingredient is guaranteed to be relatively stable and balanced without fluctuation under reaction conditions, the reaction is benefited, the reaction time is reduced, adequate time is guaranteed for mixing the materials and reaction environment can be satisfied, thereby the basic content requirement for removing calcium and magnesium impurities from the brine under such conditions in a certain reaction time is achieved, partial precipitates are precipitated without mechanical forces while conducting continuous reaction, the purpose is realized relying on the flow velocity and the flow state, the clarification load of a clarifier is reduced, and simultaneously the precipitation amount of the precipitates are shared step by step, thus the smooth discharge of waste residues is benefited.

Description

technical field [0001] The invention relates to a water purification process, in particular to a method for preparing refined brine. Background technique [0002] In addition to the main component NaCl in the raw brine, there is also Ca 2+ , Mg 2+ , SO 4 2- and other impurity ions. The unpurified raw brine is directly used for salt production or nitrate extraction, and there is CaSO in the process of preheating and evaporation 4 , Ca(CO 3 ) 2 , Mg(OH) 2 The formation of insoluble impurities such as insoluble impurities and the enrichment of various compounds will cause fouling of equipment and pipe walls, reduce heat transfer efficiency, increase energy consumption, and affect the quality of salt-making products. [0003] Therefore, the brine should be purified before evaporation, which is beneficial to prolong the operating cycle of the vacuum salt making device, reduce operating costs, improve the effective utilization rate of the device, stabilize production, redu...

AI Technical Summary

Problems solved by technology

For the reaction process, such a concentration change reduces the concentration of reactants and increases the concentration of products, thereby reducing the speed of the main reaction and increasing the speed of the side reactions in series, and the reaction selectivity decreases.

In the batch reaction method, since the materials are fed in according to a certain ratio, the concentration of each chemical substance is partially unbalanced, so that the environmental concentration of the chemical molecule or ion collision absorption reaction between the substances is different. Stability, that is, the axial diffusion concentration is unstable, which is one of the main reasons for the slow reaction time, which is easy to cause the phenomenon of back mixing;

[0009] Second, the pH value of the reaction solution in the reaction process is difficult to monitor and control due to fluctuations and long reaction times, resulting in difficult control of the amount of milk of lime added, which can easily cause the pH value of the reaction solution to fail to meet the brine process of the secondary reaction calcium removal process the requirements of the conditions;

[0010] Third, the single-stage production cycle is long. Due to the intermittent process, various operations need to be carried out intermittently, one by one, and the entire production process takes a long time;

[0011] Fourth, the chemical reaction ratio between reactants is unstable and fluctuates greatly, resulting in slow reaction and long time;

[0012] Fifth, it is difficult to discharge waste slag, with a large amount of treatment at one time, a large amount of slag, a large load on the settling discharge device, and a long time;

[0013] These various factors are some technical bottlenecks of the current batch process, but after years of actual operation, there are problems in operation, management and technology in the batch purification process of brine, which is difficult to support the further development of brine purification