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Method for preparing roasted sulfate residues into sulfites by using chemical method

A technology of sulfuric acid slag and sulfite, applied in the direction of calcium/strontium/barium sulfite, solid waste removal, etc., to avoid secondary pollution, high purity, and low investment.

Inactive Publication Date: 2011-06-15
何侠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to process and comprehensively utilize sulfuric acid slag to prepare sulfite, and to provide a method for chemically preparing sulfuric acid slag into sulfite, which effectively controls the burning of sulfuric acid industry. The accumulation and pollution of slag, 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

[0014] Embodiment 1, a kind of chemically prepared sulfuric acid slag described in the present embodiment is the method for sulfite, comprises the steps:

[0015] 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 20 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. The filter cake is sent for further processing, and at the same time, a clarified chloride liquid is obtained for further purification;

[0016] Send the chloride liquid (calculated as calcium chloride) and sulfurous acid obtained above into the second corrosion-resi...

Embodiment 2

[0018] Embodiment 2, a kind of chemically prepared sulfuric acid slag described in the present embodiment is the method for sulfite, comprises the steps:

[0019] 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 20 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. The filter cake is sent for further processing, and at the same time, a clarified chloride liquid is obtained for further purification;

[0020] Send the chloride liquid (calculated as calcium chloride) and sulfurous acid obtained above into the second corrosion-resi...

Embodiment 3

[0022] Embodiment 3, a kind of chemically prepared sulfuric acid slag described in the present embodiment is the method for sulfite, comprises the steps:

[0023] 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 20 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. The filter cake is sent for further processing, and at the same time, a clarified chloride liquid is obtained for further purification;

[0024] Send the chloride liquid (in terms of calcium chloride) and sulfurous acid obtained above into the second corrosion-resist...

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Abstract

The invention relates to a method for preparing roasted sulfate residues into sulfites by using a chemical method. The method comprises the following steps: putting roasted sulfate residues and hydrochloric acid in a pure mass ratio of 1: (1.95-2.35) in a first corrosion-resistant reactor, and starting an agitator to stir for 20 minutes; then reacting to generate chlorides such as aluminium chloride, ferric chloride, calcium chloride, magnesium chloride and the like; filtering to obtain silicides and black filter cakes of elementary sulfur as well as a clear chloride liquid at the same time; feeding the obtained chloride liquid and sulphurous acid in a pure mass ratio of 1: (0.54-0.94) to a second corrosion-resistant reactor, starting the agitator to stir, reacting to generate a mixed liquid of calcium sulfite, magnesium sulfate and hydrochloric acid, and then filtering to obtain white filter cakes; and carrying out washing and drying, winnowing classification and smashing package on the white filter cakes so as to respectively obtain calcium sulfite and magnesium sulfate products, and simultaneously, returning the obtained clear diluted hydrochloric acid back to the former process for cycle utilization. In the invention, the sulfites are prepared by using the roasted sulfate residues as raw materials.

Description

technical field [0001] The invention relates to the technical field of treatment and utilization of waste slag in the sulfuric acid industry in the inorganic chemical industry, in particular to a method for preparing sulfuric acid slag into sulfite by a chemical method. 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, conversion 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, in my country's pyrite acid production, a few factories use pickling process, and most of them still use water washing process. [0003] Pyrite is mainly composed of sulfur and iron, accompanied by a small amount of non-ferrous metals and ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/48B09B3/00
Inventor 何侠
Owner 何侠
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