Corrosion-resistant alkali pan and manufacturing process thereof

Abstract

The invention relates to a corrosion-resistant alkali pan and a manufacturing process thereof. The pan comprises a pan mouth, a pan body and an arc-shaped pan bottom, and is characterized in that the pan mouth is provided with an inner edge and an outer edge which are positioned in the same plane; the upper surface of the inner edge and the outer edge is provided with bosses; and the wall thickness of the pan body from the pan mouth to the pan bottom adopts a smooth-transition unequal-thickness structure. The inner edge prevents liquid from splashing out when the liquid in the pan body boils, while the outer edge is easy to be positioned and installed on a pan table. The manufacturing process comprises: 1. selecting materials; 2. adding and mixing carbon; 3. adding manganese and chromium;4. heating and melting; 5. adding silicon-barium inoculant; 6. standing and filtering; and 7. casting and molding. Therefore, the structure is large in volume, even to heat, low in energy consumption and convenient to clean. The pan is used to concentrate, namely refine caustic soda (NaOH) in chemical plants, and is also applicable to the evaporation and concentration of sodium sulfide, potassium hydroxide, potassium permanganate, calcium salt and other solution media.

Description

technical field [0001] The invention belongs to an evaporation separation device, in particular to a corrosion-resistant alkali pot used for normal-pressure evaporation of caustic soda solution and its manufacturing process. Background technique [0002] As we all know, the pot-type cooking solid alkali is boiled by using a cast iron pot to directly heat and evaporate the liquid alkali under normal pressure. At present, the market discloses a corrosion-resistant alkali pot with a conical pot body. The vertical height of the corrosion-resistant alkali pot is relatively high, so the pot platform matched with the pot body is required to be deep, thereby increasing the difficulty of building the pot platform; The capacity of the pot is small, and it is not easy to clean after the alkali discharge, which brings certain difficulties to the cleaning personnel, making the time interval between one alkali discharge and the next alkali discharge longer, resulting in increased energy c...

AI Technical Summary

Problems solved by technology

At present, the market discloses a corrosion-resistant alkali pot with a conical pot body. The vertical height of the corrosion-resistant alkali pot is relatively high, so the pot platform matched with the pot body is required to be deep, thereby increasing the difficulty of building the pot platform; The capacity of the pot is small, and it is not easy to clean after the alkali discharge, which brings certain difficulties to the cleaning personnel, making the time interval between one alkali discharge and the next alkali discharge longer, resulting in increased energy consumption; in addition, the wall thickness of the pot body is Uniform wall thickness, so that the bottom of the pot is easy to deform and crack under long-term heating, which has great potential safety hazards; another Chinese patent 97216035.3 "anti-corrosion composite solid alkali pot" adopts a double-layer structure, and its inner layer is anti-corrosion This design is effective in terms of corrosion resistance and longevity, but its structural characteristics determine that its heat transfer is extremely poor. Compared with the original single-layer cast iron pot, a corrosion-resistant layer of metal and an air film are added. And two wall thermal resistances are added, and the heat transfer performance of the alkali pot as an evaporation device is an important indicator, so it has no industrial value in comprehensive consideration

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