A process for producing a pure magnesium sulphite from crude crystalline magnesium sulphite. Into a full suspension or flow containing magnesium sulphite crystals at least one further water-containing and heat-supplying flow is led. The heat-supplying flow rapidly increases the temperature of the suspension to above 80 DEG C. in less than 10 seconds, preferably in less than 2 seconds. The solid water-insoluble fraction is then separated from the resulting flow, and the pure product is recrystallized from the solution. The solution may be recycled into the process either for further purification or for use as at least one heat-supplying flow.
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