Sodium sulfide solution purification process

Abstract

The invention relates to an alkali liquor purification process method in a sodium sulphide production course. The alkali liquor purification process method comprises a thermal dissolution process, a centrifugal settlement and separation process, a filtration process. By adopting the alkali liquor purification process of the invention, equipment can be simplified, in particular, continuous and uninterrupted operation can be realized; the working efficiency is greatly improved, in particular, the product quality is greatly improved; meanwhile, residual alkali in sludge can be fully washed and recovered; the process is shortened, and quantitative automatic switch control can be realized easily on schedule; and the situations of leaking and polluting environment can be reduced.

Description

Technical field: [0001] The invention relates to a process for purifying alkali liquor during the production process of alkali sulfide. Background technique: [0002] In the production process of soda sulfide (Na2S), the calcined clinker directly enters the heating tank for thermal melting, and the solution obtained after thermal melting is a suspension with a large amount of impurities, which needs to be purified before evaporation. At present, there are two methods of purifying lye in the production process of soda sulfide: one is to use a settler to settle naturally. The disadvantage is that to prevent the viscosity of the lye from changing, heat preservation and heating are required, the settling speed is slow, the processing capacity is small, and the investment in equipment and civil construction is large. , Serious corrosion of equipment, affecting product quality. The second is to use a plate and frame filter press for filtration. The disadvantage is that the filter...

AI Technical Summary

Problems solved by technology

At present, there are two methods of purifying lye in the production process of soda sulfide: one is to use a settler to settle naturally. The disadvantage is that to prevent the viscosity of the lye from changing, heat preservation and heating are required, the settling speed is slow, the processing capacity is small, and the investment in equipment and civil construction is large. , serious corrosion to equipment, affecting product quality

The second is to use a plate and frame filter press to filter. The disadvantage is that the filter press needs frequent manual unloading of slag and can only be operated intermittently. The manual labor intensity is high, the efficiency is low, the leakage is serious, and the environment and products are polluted.