Description

Project Overview

The barium chloride solution produced through the acid-leaching process is processed in an integrated evaporation and crystallization system, followed by centrifugation and drying, to obtain high-quality barium chloride crystals.

The complete process combines evaporation, crystallization, solid-liquid separation, and drying technologies to achieve efficient and continuous industrial production of barium chloride.

Solubility Characteristics of Barium Chloride

The solubility of barium chloride increases significantly with temperature. This characteristic makes evaporative concentration combined with cooling crystallization an ideal process route for industrial barium chloride production.

The primary function of the multiple-effect evaporator system is to concentrate the purified low-concentration barium chloride solution to a supersaturated state. This provides a stable feed stream for the downstream crystallization process and serves as the key step in transforming dissolved barium chloride into crystalline product.

Process Flow 

The process combines triple-effect evaporation, flash cooling crystallization, cooling crystallization, centrifugation, and drying technologies to achieve efficient recovery and production of high-purity barium chloride crystals.

The integrated system offers the advantages of low steam consumption, stable operation, high product quality, and reduced operating costs, making it suitable for large-scale industrial barium chloride production.

The barium chloride solution is first fed into a triple-effect forced-circulation evaporator system, where it is concentrated until a supersaturated state.

The concentrated liquor is then discharged into a flash cooling crystallizer, where rapid pressure reduction and flash evaporation further increase the degree of supersaturation, promoting crystal nucleation and precipitation. Subsequently, the slurry enters cooling crystallizers, where it is cooled by circulating cooling water to facilitate  further crystal growth and aging.

The resulting solid-liquid mixture is separated in a centrifuge. The wet crystals are then transferred to a drying system, producing the final dried barium chloride product.

Counter-Current Multi-Effect Evaporation Technology

Our barium chloride evaporation and crystallization system is designed based on the unique physical and chemical properties of barium chloride, ensuring high efficiency, low energy consumption, and stable continuous operation.

The system adopts a countercurrent multi-effect evaporation process, enabling efficient heat recovery and optimized concentration performance.

• The feed solution and heating steam flow in opposite directions, with the solution sequentially passing from the third effect to the first effect.

• Live steam is introduced into the first effect, while the generated secondary vapor is reused as the heating medium for subsequent effects, achieving three-stage heat recovery and significantly reducing steam consumption.

• Each effect is equipped with an independent vacuum control function. The vacuum level increases from the first to the third effect, enabling progressively lower boiling temperatures and ensuring stable evaporation under controlled conditions.

After multi-effect evaporation, the concentrated barium chloride solution is discharged from the first effect at high temperature, which ensures higher outlet concentration and improved solution fluidity, while also reducing viscosity-related handling issues. This high-temperature discharge is beneficial for downstream flashing and crystallization.

The hot concentrated liquor then enters a flash crystallizer, where rapid pressure reduction and flash evaporation further increase supersaturation, promoting efficient crystal nucleation.

Subsequently, the slurry flows into a cooling crystallizer, where controlled cooling enhances crystal growth and improves particle size distribution and product quality.

This staged crystallization approach ensures stable operation, avoids sudden supersaturation shocks, and minimizes the risk of crystallizer blockage.

Finally, the slurry is sent to a centrifuge for solid-liquid separation, and the wet crystals are transferred to a drying system to obtain high-purity, free-flowing barium chloride crystals.

Key Advantages of the System

• High-temperature discharge from first effect ensures higher concentration and better process stability

• Efficient multi-effect heat recovery with significantly reduced steam consumption

• Stable vacuum operation with optimized boiling point distribution

• Controlled flash and cooling crystallization for improved crystal quality

• Reduced fouling and stable continuous industrial operation

• Fully integrated evaporation–crystallization–drying process solution

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