Device and process for continuously producing aluminum sulfate octadecahydrate

Abstract

The invention discloses a device and a process for continuously producing aluminum sulfate octadecahydrate. The device comprises a first storage tank, a second storage tank, a continuous tank reactor,a gradient crystallizer and a solid-liquid separator, wherein the first storage tank contains dilute-phase waste sulfuric acid; the second storage tank contains concentrated-phase sulfuric acid; thefirst storage tank and the second storage tank are respectively connected with the continuous tank reactor through delivery pumps and pipelines; the continuous tank reactor is communicated with the storage bin through a screw feeder, and aluminum hydroxide is added into the storage bin. A liquid outlet of the continuous tank reactor is connected with the solid-liquid separator through a pipeline by virtue of the gradient crystallizer, an aluminum sulfate octadecahydrate reaction product is crystallized from reaction liquid in the gradient crystallizer and then is fed into the solid-liquid separator to be separated to obtain an aluminum sulfate octadecahydrate crystals and mother liquor, and the mother liquor can be reused as dilute-phase waste sulfuric acid. In the process of producing thealuminum sulfate octadecahydrate, the requirement on the quality of sulfuric acid is not high, the waste sulfuric acid can be recycled, and the treatment cost of the waste sulfuric acid is reduced.

Description

technical field [0001] The invention relates to a device and a process for continuously producing aluminum sulfate octadecahydrate. Background technique [0002] Sulfuric acid is used in all aspects of industrial production, and at the same time of utilization, a large amount of waste sulfuric acid is produced. Compared with industrial solid waste and industrial waste gas, waste sulfuric acid is a kind of liquid, and waste sulfuric acid or sulfuric acid-containing wastewater discharged from production often cannot be used directly in the original process; unreasonable treatment will acidify water or soil, which is harmful to the ecology The environment is harmed and a lot of resources are wasted. [0003] The recovery of waste sulfuric acid by concentration method is currently the most commonly used sulfuric acid recovery method in my country. This method consumes a lot of energy and is reasonable for waste sulfuric acid with a concentration greater than 60%, but it is not ...

AI Technical Summary

Problems solved by technology

Compared with industrial solid waste and industrial waste gas, waste sulfuric acid is a kind of liquid, and waste sulfuric acid or sulfuric acid-containing wastewater discharged from production often cannot be used directly in the original process; unreasonable treatment will acidify water or soil, which is harmful to the ecology Harmful to the environment and a huge waste of resources

[0003] The recovery of waste sulfuric acid by concentration method is currently the most commonly used sulfuric acid recovery method in my country. This method consumes a lot of energy and is reasonable for waste sulfuric acid with a concentration greater than 60%, but it is not suitable for the reuse of low-concentration waste sulfuric acid.

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