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Method for producing sulfite by using pyrite cinders

A technology of sulfuric acid slag and sulfite, applied in the direction of calcium/strontium/barium sulfite, magnesium sulfite, etc., to achieve the effects of improving economic benefits, high purity and considerable economic benefits

Inactive Publication Date: 2016-03-30
常德湘大环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to process and comprehensively utilize sulfuric acid slag to prepare sulfite, and provide a method for producing sulfite by using sulfuric acid slag, which effectively controls the accumulation of sulfuric acid industrial slag and pollution, and produce a variety of chemical products such as chlorides, creating considerable economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment one, a kind of method utilizing sulfuric acid slag to produce sulfite described in the present embodiment, comprises the steps:

[0017] Take 500 kg of sulfuric acid slag with a calcium oxide content of 1.63% and a magnesium oxide content of 0.46% to prepare sulfite, and put the sulfuric acid slag (calculated as aluminum chloride) and hydrochloric acid into the first resistance with a pure mass ratio of 1:2.15. In the corroded reactor, turn on the agitator and stir slowly at the same time to make the substances react chemically. After 23 minutes, the reaction will generate aluminum chloride, ferric chloride, calcium chloride, magnesium chloride and other chlorides, and filter to obtain silicide and elemental Sulfur black filter cake is sent to another deep processing, and at the same time, a clear chloride liquid is obtained for the next step of purification;

[0018] Send the chloride liquid (calculated as calcium chloride) and sulfurous acid obtained above ...

Embodiment 2

[0020] Embodiment two, a kind of method utilizing sulfuric acid slag to produce sulfite described in the present embodiment, comprises the steps:

[0021] Take 500 kg of sulfuric acid slag with a calcium oxide content of 1.63% and a magnesium oxide content of 0.46% to prepare sulfite, and put the sulfuric acid slag (calculated as aluminum chloride) and hydrochloric acid into the first corrosion-resistant In the reactor, turn on the agitator at the same time and stir slowly to make the substances react chemically. After 23 minutes, the reaction will generate chlorides such as aluminum chloride, ferric chloride, calcium chloride, magnesium chloride, etc., and filter to obtain silicide and elemental sulfur black The filter cake is sent for further processing, and at the same time, a clarified chloride liquid is obtained for further purification;

[0022] Send the chloride liquid (calculated as calcium chloride) and sulfurous acid obtained above into the second corrosion-resistant...

Embodiment 3

[0024] Embodiment three, a kind of method utilizing sulfuric acid slag to produce sulfite described in the present embodiment, comprises the steps:

[0025] Take 500 kg of sulfuric acid slag with a calcium oxide content of 1.63% and a magnesium oxide content of 0.46% to prepare sulfite, and put the sulfuric acid slag (calculated as aluminum chloride) and hydrochloric acid into the first corrosion-resistant In the reactor, turn on the agitator at the same time and stir slowly to make the substances react chemically. After 23 minutes, the reaction will generate chlorides such as aluminum chloride, ferric chloride, calcium chloride, magnesium chloride, etc., and filter to obtain silicide and elemental sulfur black The filter cake is sent for further processing, and at the same time, a clarified chloride liquid is obtained for further purification;

[0026] Send the chloride liquid (in terms of calcium chloride) and sulfurous acid obtained above into the second corrosion-resistant...

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PUM

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Abstract

The invention discloses a method for producing sulfite by using pyrite cinders. The method comprises the following steps of: inputting pyrite cinders and hydrochloric acid in a pure mass ratio of 1: (1.86-2.48) in a first corrosion-resistant reactor to obtain a mixture; starting a stirrer to stir the mixture; performing a reaction in 23 minutes to generate chlorides such as aluminium chloride, ferric chloride, calcium chloride and magnesium chloride; filtering the chlorides to obtain silicides and an elemental sulfur black filter cake, and obtaining a clarified chloride liquid at the same time; feeding the obtained chloride liquid and sulphurous acid in a pure mass ratio of 1: (0.48-0.98) into a second corrosion-resistant reactor, starting the stirrer to stir the mixture, and performing a reaction to generate a mixed liquid of calcium sulfite, magnesium sulfite and hydrochloric acid, and filtering the mixed liquid to obtain a white filter cake; and washing and drying, winnowing and grading and crushing and packaging the obtained white filter cake to separately obtain a calcium sulfite product and a magnesium sulfite product, and at the same time obtaining the clarified diluted hydrochloric acid to return to the previous step for being recycled. The method provided by the invention takes the pyrite cinders as raw materials to prepare sulfites, thereby creating a considerable economic benefit.

Description

technical field [0001] The invention relates to the technical field of treatment and utilization of waste slag in the sulfuric acid industry in inorganic chemical industry, in particular to a method for producing sulfite by using sulfuric acid slag. Background technique [0002] The sulfuric acid industry uses pyrite as raw material to produce sulfuric acid by contact method, which is mainly composed of five processes: raw material, roasting, purification, transformation and absorption. Generally, the purification process is generally used to divide sulfuric acid production into two categories: dry method and wet method. Wet cleaning can be divided into pickling, hot concentrated pickling and water washing. At present, a small number of pyrite acid production plants in my country are pickling processes, and most of them are still water washing processes. [0003] Pyrite is mainly composed of sulfur and iron, accompanied by a small amount of non-ferrous metals and rare meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/42C01F11/48
Inventor 徐联菊
Owner 常德湘大环保科技有限公司