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A kind of method that prepares ferrous disulfide to co-produce sulfuric acid

A technology of ferrous disulfide and sulfuric acid, applied in iron sulfide, chemical instruments and methods, sulfur compounds, etc., can solve the problems of difficult recycling, waste of resources, and many impurities, and achieves easy promotion, short production cycle, Simple process steps

Active Publication Date: 2016-01-20
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Every time 1 ton of sulfuric acid produced by pyrite ore produces 0.8-0.9 tons of pyrite slag, which is rich in iron resources, but because it contains more impurities, it is difficult to recycle, resulting in waste of resources and damage to the environment. Pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 2

[0029] The preparation method of embodiment 1 ferrous disulfide co-production sulfuric acid

[0030] a. Dry 1g of ferrous sulfate at 50°C for 120min;

[0031] b, the ferrous sulfate raw material after drying is passed into gaseous sulfur in nitrogen and gaseous sulfur atmosphere, 400 ℃ (wherein, gaseous sulfur accounts for 60% of the total volume of mixed gas, namely S / (S+N 2 ) is 60% by volume, and the total gas velocity is 100ml / min under standard conditions), and reacts for 45min to obtain ferrous disulfide and sulfur dioxide; the concentration of sulfur dioxide obtained is 9.5vol%, which can be produced by two-turn and two-suction processes sulfuric acid.

[0032] After determination, the conversion rate of ferrous sulfate is 92%, and the purity of ferrous disulfide reaches 85wt%.

Embodiment 2 2

[0033] The preparation method of embodiment 2 ferrous disulfide co-production sulfuric acid

[0034] a. Dry 2g of ferrous sulfate at 100°C for 80min;

[0035] B, the ferrous sulfate raw material after drying is in nitrogen, gaseous sulfur and carbon dioxide atmosphere, under 500 ℃, pass into gaseous sulfur (wherein, gaseous sulfur accounts for 35% of the total volume of mixed gas, namely S / (S+N 2 +CO 2 ) is 35% by volume, and the gas total gas velocity is 100ml / min under standard conditions, and reacts for 35min to obtain ferrous disulfide and sulfur dioxide; the gained sulfur dioxide concentration is 15vol%, and can adopt two to turn and two suction processes to produce sulfuric acid.

[0036] After determination, the conversion rate of ferrous sulfate is 94%, and the purity of ferrous disulfide reaches 90wt%.

Embodiment 3 2

[0037] The preparation method of embodiment 3 ferrous disulfide co-production sulfuric acid

[0038] a. Dry 2g of ferric sulfate at 200°C for 60min;

[0039] b. Feed the dried ferric sulfate raw material into nitrogen, gaseous sulfur and sulfur dioxide atmosphere at 600°C, and feed gaseous sulfur (wherein, gaseous sulfur accounts for 35% of the total volume of the mixed gas, that is, S / (S+N 2 +SO 2 ) is 35% by volume, and the total gas velocity is 100ml / min under standard conditions, and reacts for 80min to obtain ferrous disulfide and sulfur dioxide; the gained sulfur dioxide concentration is 12vol%.

[0040] It has been determined that the conversion rate of ferric sulfate is 96%, and the purity of ferrous disulfide reaches 95wt%.

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Abstract

The invention relates to a method for preparation of ferrous disulfide and coproduction of sulfuric acid, belonging to the technical field of the preparation method of inorganic compounds. The method specifically comprises the following steps: a, placing sulfate or iron oxide of iron at a temperature of 300 DEG C-700 DEG C, and ventilating gas-state sulfur to react for 20 minutes-120 minutes to prepare ferrous disulfide and a sulfur dioxide gas; and b, preparing sulfuric acid by using the sulfur dioxide gas obtained in the step a. According to the method for preparation of ferrous disulfide and coproduction of sulfuric acid, conversion rate of materials generally reaches over 90%, and purity of the obtained ferrous disulfide can reach over 80wt%. Besides, the method disclosed by the invention is not only low in energy consumption and high in degree of reduction, but also simple in process, short in production period, easy to control and convenient to popularize.

Description

technical field [0001] The invention relates to a method for preparing ferrous disulfide to co-produce sulfuric acid, and belongs to the field of preparation methods of inorganic compounds. Background technique [0002] Ferrous disulfide is an important chemical raw material, which has important uses in industries such as rubber, papermaking, textiles, food, matches, batteries, and agriculture. Ferrous disulfide mainly exists in the form of pyrite in nature. In my country, pyrite is mainly of medium and low grade, with an average grade of 15% to 18%. Due to its low purity, its application is also subject to many restrictions. There are usually two types of pyrite development purposes in my country: one is the local sulfur refining process that has been completely closed, and the sulfur produced is mainly used for the production of sulfuric acid and chemical raw materials. This method has a low utilization rate of sulfur resources and serious environmental pollution; the othe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/12C01B17/74
Inventor 杨林蒋兵王辛龙陈晓东杨秀山孔行健张志业
Owner SICHUAN UNIV