Production process of aluminium sulfate by using aluminum ores

Abstract

The invention discloses a production process of aluminium sulfate by using aluminum ores. The method comprises the following steps: a) adding aluminum ore powder paste and concentrated sulfuric acid in a reaction kettle to perform a chemical reaction; b) discharging the obtained solid-liquid mixture to a thinning tank to dilute and cool; c) conveying the solid-liquid mixture in a filter press to perform filter pressing and obtain an aluminium sulfate solution; d) performing acid-base neutralization on the aluminium sulfate solution to obtain a liquid aluminium sulfate product; e) heating the aluminium sulfate solution to evaporate; and f) delivering the evaporated aluminium sulfate solution to a crystallizing steel band, and performing air blowing and water cooling to obtain solid aluminium sulfate. The method has the following advantages: the existing sedimentation method is not adopted, and the solid-liquid mixture is subjected to filter pressing to obtain the liquid aluminium sulfate product, the product has low moisture so that a lot of heat energy can be saved during evaporation and the cost can be reduced; the production time is half an hour, thus the production cycle can be shortened, labor can be saved and the efficiency can be high; the filter pressing of the solid-liquid mixture can be directly performed to obtain an aluminium sulfate solution; and the aluminium sulfate solution is not evaporated and is directly delivered to the crystallizing steel band to prepare the solid aluminium sulfate through air blowing and water cooling.

Description

technical field [0001] The invention belongs to the technical field of manufacturing inorganic chemical materials, and in particular relates to a production process for preparing aluminum sulfate from aluminum ore. Background technique [0002] As an inorganic salt product, aluminum sulfate is widely used in industry. It is mainly used as a sizing agent in the paper industry, a flocculant in drinking water purification, industrial water purification, and industrial wastewater treatment. It can also be used in purification Fats and oils, pharmaceutical cosmetics, fire extinguishing agents, leather tanning and the production of various compound aluminum salts, etc. The main components of aluminum ore include alumina and silica. The use of aluminum ore to prepare aluminum sulfate is mainly due to the reaction of alumina and sulfuric acid to produce aluminum sulfate. At present, most of its production processes are as follows: crush aluminum ore into particles, put it in a reac...

AI Technical Summary

Problems solved by technology

The prior art scheme has the following defects: when producing liquid aluminum sulfate, the settling time of the solid-liquid mixture discharged from the reactor in the settling tank is generally 1 to 2 days before a part of the aluminum sulfate solution can be obtained; It still contains a large amount of aluminum sulfate, which must be washed again or even multiple times to obtain the remaining aluminum sulfate. Therefore, the construction period is long and the production efficiency is low, resulting in huge product costs and high prices; when producing solid aluminum sulfate, it is also because The liquid aluminum sulfate used contains a lot of water and is at normal temperature. During the evaporation process, a lot of heat energy is needed, so the production cost is further increased.