Storage battery waste acid resource treatment method

Abstract

The invention discloses a storage battery waste acid resource treatment method, which comprises the following steps: (1) a H2S gas is introduced into storage battery waste acid for mixing and purification, and filter residue and filtrate are obtained by solid-liquid separation after completion of the purification; and (2) the filtrate is introduced into an adiabatic evaporation concentration tower for full contact of the filtrate and high-temperature flue gas to obtain firstly-concentrated sulfuric acid. The storage battery waste acid resource treatment method has the advantages of low energy consumption, high economic efficiency of the recycled product and realization of low cost storage battery waste acid recycling, and the recycled storage battery waste acid can meet storage battery acid standards. The storage battery waste acid resource treatment method fully utilizes high temperature acid production tail gas as a heat source in an adiabatic evaporation process, greatly reduces the energy consumption and cost, at the same time, the acid production tail gas has no change in other states except humidity increase and smoke temperature decrease, the acid production tail gas can be directly discharged, and no additional pollution is brought to the environment.

Description

technical field [0001] The invention belongs to the technical field of waste acid treatment, and in particular relates to a resource treatment method for battery waste acid. Background technique [0002] As an important industrial raw material, sulfuric acid can be used to manufacture fertilizers, medicines, explosives, pigments, detergents, batteries, etc. It is also widely used in industries such as purification of petroleum, metal smelting, and dyes. Because of the different uses, the quality of sulfuric acid is also divided into various grades, among which industrial sulfuric acid and battery acid are the most used. [0003] The traditional process mainly adopts the acid-base neutralization method for the treatment of waste acid. This method not only costs a lot, and the sulfuric acid resource is not reused, but also produces a large amount of waste residue. Due to the heavy metal content, these waste residues are listed as hazardous waste. Today, with more and more str...

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Problems solved by technology

However, after solving the problem of resource utilization, the problem of excessive concentration energy consumption followed. The concentration of acid is accompanied by the consumption of steam. If the consumption of steam is not reduced, in today's overcapacity of industrial sulfuric acid, other The value of the process is also greatly reduced. For this reason, there have been some concentration processes that can save energy, including the multi-effect acid concentration process and the hot air concentration process.

But even so, the steam consumption of evaporating one ton of water at the current technological level still reaches 0.5-0.8t of steam. If the hot air concentration process is adopted, electric energy is used to heat the gas. Although the steam consumption is reduced, the power consumption of the system will be greatly increased. consumption

In the case of consuming a lot of energy, the sulfuric acid obtained from recycling is only a relatively concentrated dilute acid of industrial sulfuric acid grade, which is not very useful to enterprises, and there is no way out for export, which is very embarrassing

[0005] At present, the production capacity of industrial sulfuric acid in my country is in excess due to the large amount of smelting flue gas acid production system. The sales price is about 200 yuan / t, and there is a problem of sales difficulties. However, the same consumption is large, and the price is 3-4 of industrial sulfuric acid. times the battery acid is in short supply

On the one hand, due to the rapid development of the automobile industry, on the other hand, it is also related to the high quality requirements of battery acid, which is basically not recycled.

[0006] In the use of battery sulfuric acid, its concentration is affected by factors such as temperature, state of charge, and service life. The acid concentration will change, and at the same time, the content of metal ions in the acid will also increase, and it cannot be used in the end; at the same time, during the recovery process Because of the broken and cleaned batteries, the battery acid will be further diluted, and some solid impurities will enter at the same time, which brings difficulties to the recycling of battery acid, which leads to the use of battery acid. It is considered that waste acid is seldom recycled; and because of the large amount of energy consumed in the process of battery sulfuric acid recovery, companies basically do not really use the recovery of battery waste acid, and it is difficult to realize the recovery of battery acid

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