Method for preparing sulfur and sulfur dioxide from sulfur dyes waste water

Abstract

The invention relates to a sulfur and sulfur dioxide preparation method using sulfur dye waste water, which belongs to the comprehensive treating technical field of the byproducts of chemical dyeing materials. The sulfur dye waste water containing sodium thiosulfate after processed is used as raw materials, which are added with acid for reaction, or the waste water is added to the acid for reaction, with a reaction temperature of 20 to 105 DEG C. The sulfur dioxide produced in the reaction is absorbed by alkali or salt to produce sulfur dioxide derivant. When the reaction is carried out to the final state, elemental sulfur is precipitated. Then the elemental sulfur is cooled to be 10-90 DEG C, filtrated and washed in water to obtain sulfur. In the invention, the sulfur dye waste water containing sodium thiosulfate is decolored and done with other certain treatment and added with the acid to react chemically with each other; the sulfur dioxide is absorbed by alkali or salt to produce the sulfur dioxide derivant and the sulfur is obtained after being precipitated an filtrated. The invention can effectively resolve the difficult problem of wastewater treatment, utilizes the waste to get valuable and has great economic and environmental benefits.

Description

technical field [0001] The invention relates to a method for preparing sulfur and sulfur dioxide from sulfur dye wastewater, which belongs to the technical field of comprehensive treatment of by-products of chemical dyes and chemicals. Background technique [0002] In the prior art, there is a series of waste water containing sodium thiosulfate (big soda) reclaimed by sodium thiosulfate. The common name of sodium thiosulfate is soda. It is used in photography, tanning, and paper industry. Most of them use the method of waste liquid recovery. For example: the application number is 87105475.2 and "Environmental Protection and Safety Technology" 1998.6 phase "utilizes sulfur dye wastewater to produce industrial sodium thiosulfate" all is the technology that reclaims sodium thiosulfate from the sulfur dye production wastewater containing sodium thiosulfate, will Sulfur dye wastewater containing sodium thiosulfate is precipitated, then evaporated and concentrated, filtered to re...

AI Technical Summary

Problems solved by technology

However, for an annual output of 10,000 tons of sulfur dyes, there is 10,000 tons of recycled sodium thiosulfate produced, so there is a big problem in the sale of so much sodium thiosulfate, and the product quality cannot meet the requirements of the relevant photographic grade

At the same time, due to the low price of sodium thiosulfate, the energy consumption in the recovery process is large, and there is no economic benefit in fact.