Abstract
Salt slurry is a special sludge produced in the process of brine purification in chlor-alkali industry. In order to eliminate the harm of salty slurry to the environment and realize its economic value, a salty slurry harmlessness, reduction and resource utilization treatment method was proposed. Through this method, salty slurry will be transformed into desulfurizer with its water content and Cl- content reduced to 15% and 0.5% respectively. This method has been applied to projects, bringing environmental and economic benefits.
Highlights
Brine purification is an important process in the salt production industry
The basic principle is to put an appropriate amount of CO32 + and OH- into brine to transform Ca2 + and Mg2 + into precipitate to remove these impurities, and the salty slurry comes from this process
Salty slurry is composed of liquid phase and small particles in solid phase, and the main component of liquid phase is brine, and the main components of solid phase particles are CaCO3 and Mg (OH) 2 and some other insoluble [2]
Summary
Brine purification is an important process in the salt production industry. And the "double-alkali method" or "flue gas method [1]" are often used to purify brine. In order to meet the requirements for the use of salty slurry as desulfurizer, a treatment process chart as shown in Figure 1 was formulated This process includes four main systems: salt mud washing system, salty slurry deep dehydration system, salt mud crushing and granulating system, and heat pump drying system. After three-stage washing, the salty slurry will be pumped into deep dehydration system in which the water content of salty slurry will be reduced from 85% to 50% by special solid-liquid separation equipment. The liquid generated from the fourthstage solid-liquid separation with very low salt content will be recovered by water recycling system and directly used for the first salty slurry washing
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