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Method for preparing sulfuric acid from ferrous sulfate

A technology of ferrous sulfate and sulfuric acid, applied in chemical instruments and methods, iron oxides, sulfur compounds, etc., can solve the problems of low utilization rate of ferrous sulfate and large scale of sulfuric acid

Pending Publication Date: 2020-07-07
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the technical deficiencies such as the low utilization rate of ferrous sulfate at the present stage and the excessive scale of burning sulfuric acid, the invention provides a method for preparing sulfuric acid from ferrous sulfate

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  • Method for preparing sulfuric acid from ferrous sulfate
  • Method for preparing sulfuric acid from ferrous sulfate
  • Method for preparing sulfuric acid from ferrous sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] FeSO 4 ·7H 2 Experiment of mixed calcination of O and coal in air

[0075] Analytical pure ferrous sulfate heptahydrate is used as the reaction raw material, coal washing is selected as ferrous sulfate thermal decomposition reducing agent, and analytical pure FeSO 4 ·7H 2 O is mixed with coal at different C / S (molar ratios) and fed into an atmosphere tube furnace for calcination at different temperatures in an air atmosphere. The selection of C / S value is 0.25, 0.67, 1, 1.5, 2 according to the reaction equation of ferrous sulfate and coal. The experimental temperature was selected as 650°C, 700°C, 750°C, and 800°C according to the thermogravimetric results.

[0076] The result is shown in Figure 1.

[0077] Figure 1(a) shows the FeSO 4 ·7H 2 O decomposes to produce SO in the furnace gas 2 It can be seen from Figure 1(a) that under the air atmosphere, a small amount of coal reduces and decomposes ferrous sulfate 2 The concentration is very low. However, after a...

Embodiment 2

[0082] Separate Calcination of Industrial Ferrous Sulfate

[0083] Raw material industrial FeSO 4 ·H 2 O is finely ground and passed through a 100-mesh standard sampling sieve; then, the temperature of the atmosphere tube furnace is raised to the specified temperature, and 2.0g of industrial FeSO is weighed. 4 ·H 2 O is placed in an atmosphere tube furnace and calcined at different temperatures in an air atmosphere, which produces SO 2 The relationship between the instantaneous concentration and time is shown in Figure 2, and the calculation of FeSO 4 ·H 2 O conversion rate and desulfurization rate. The decomposition temperature of some sulfuric acid impurity salts contained in industrial ferrous sulfate is higher than 800°C, so the reaction temperature is selected as 800°C, 850°C, 900°C, and 950°C in the examples.

[0084] Refer to Figure 2 for the results. Figure 2(a) shows the FeSO at different temperatures in the air atmosphere 4 ·H 2 After O is calcined alone, SO...

Embodiment 3

[0086] Oxygen concentration on industrial FeSO 4 4H 2 Effect of O Ferrous Sulfate Decomposition

[0087] Raw material industrial FeSO 4 4H 2 O and coal are finely ground and passed through a 100-mesh standard sieve; the reducing agent coal and industrial FeSO 4 4H 2 O was mixed according to different C / S molar ratios, weighed 2.0g and put it into the atmosphere tube furnace whose temperature had reached the specified temperature, calcined at different temperatures, and controlled different oxygen concentrations until there was no gas in the gas at the furnace outlet. SO 2 After degassing, stop the experiment.

[0088] The result is shown in Figure 3.

[0089] It can be seen from Figure 3(a) that under different oxygen concentrations, the corresponding optimal C / S is different. As the oxygen concentration increases, the minimum coal value required for reduction is greater. When the oxygen concentration is between 10 and 20%, before the coal value reaches the optimal C / S...

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Abstract

The invention relates to a method for preparing sulfuric acid from ferrous sulfate, which belongs to the technical field of solid waste comprehensive utilization. According to the technical scheme, the method comprises the following steps: ferrous sulfate and coal are uniformly mixed and then are fed into a high-temperature decomposition furnace; after roasting, furnace gas containing sulfur dioxide and a solid-phase substance containing Fe2O3 are generated; the furnace gas is catalyzed by a converter to generate sulfur trioxide, the sulfur trioxide is absorbed by concentrated sulfuric acid togenerate sulfuric acid, the aerobic atmosphere means that the volume fraction of oxygen in the gas introduced into the high-temperature decomposition furnace is 5-20%, and the volume fraction of sulfur dioxide in the sulfur dioxide-containing furnace gas is more than or equal to 10%. Compared with the prior art, no waste is generated in the technological process, the desulfurization rate of ferrous sulfate is larger than or equal to 93%, the content of Fe2O3 in the slag is larger than or equal to 86%, and the slag can be directly used as an iron smelting raw material. According to the method,the titanium dioxide production waste ferrous sulfate is recycled, potential sulfur resources are developed, and the current situation of shortage of sulfur resources in China can be relieved, and meanwhile, a circular economy industrial chain of a sulfuric acid method titanium dioxide enterprise is also formed.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste, and in particular relates to a method for preparing sulfuric acid by thermally decomposing ferrous sulfate. Background technique [0002] Ferrous sulfate is the industrial waste residue produced by the reaction of ilmenite and sulfuric acid in the production process of sulfuric acid titanium dioxide. At present, domestic titanium dioxide manufacturers basically use the sulfuric acid process to produce titanium dioxide. Generally, 1t of titanium dioxide will produce 2.5~ 4.0t ferrous sulfate heptahydrate, the by-product ferrous sulfate can be used as water purifier, fertilizer, feed additive and building materials, etc., but because the amount of ferrous sulfate produced by titanium dioxide far exceeds the current demand for these products, therefore, A large part of ferrous sulfate is stacked after neutralization, which not only occupies a large amount of land res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74C01G49/06
CPCC01B17/745C01G49/06C01P2006/80
Inventor 陈葵杨颜宇朱家文赵经宇朱玉
Owner EAST CHINA UNIV OF SCI & TECH
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