Method for comprehensively treating waste hydrochloric acid and alkaline sludge generated in steel wire rope processing process

Abstract

The invention provides a method for comprehensively treating waste hydrochloric acid and alkaline sludge generated in the steel wire rope processing process. The waste hydrochloric acid generated in the steel wire rope processing process is added into the alkaline sludge generated in the steel wire rope processing process; then, the stirring is carried out, so that the sufficient reaction is taken, and a suspension with a small number of acid non-soluble substances is formed; when the PH value in the suspension is not changed, the stirring is stopped; then, the small amount of acid non-soluble substances in the suspension are filtered away, so that acid filter liquid containing various metal ions can be obtained; the PH value of the acid filter liquid is controlled to be in a range being 0 to 1. The mass ratio of the hydrochloric acid to the alkaline sludge is (1-8):1. The hydrochloric acid concentration in the waste hydrochloric acid is not lower than 5 percent, and the hydrochloric acid is added for regulation when the hydrochloric acid concentration in the waste hydrochloric acid is lower than 5 percent.

Description

technical field [0001] The invention relates to the field of industrial waste acid treatment, in particular to a method for comprehensively treating waste hydrochloric acid and alkaline sludge produced in steel wire rope processing. Background technique [0002] The steel wire rope needs to be pickled with hydrochloric acid to remove the oxide skin on the metal surface during the processing process. As the concentration of iron in the pickling liquid hydrochloric acid gradually increases, and the acidity of hydrochloric acid decreases correspondingly, when the iron concentration reaches a certain level, it must be scrapped, resulting in For waste hydrochloric acid, about 0.032 tons of waste hydrochloric acid will be produced for every ton of steel wire rope produced, and the formed waste hydrochloric acid contains various impurities such as iron, zinc, and lead, which will affect its direct utilization. In addition to pickling, phosphating, galvanizing, and lead bath heat tr...

AI Technical Summary

Problems solved by technology

It can also be made into iron salt water purifier by chemical method, but it will cause the transfer of heavy metal lead and zinc pollution when used

Alkaline sludge is generally landfilled or smelted in a rotary kiln. Landfilling will pollute groundwater. Although heavy metals such as lead and zinc in sludge can be extracted through smelting in a rotary kiln, the sludge contains about 80% water. The content of lead and zinc is very low, the energy consumption is high, and the smelting will also produce waste gas containing heavy metals, which will pollute the environment