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Ferrous sulfate comprehensive utilization method

A technology of ferrous sulfate and sodium carbonate, applied in chemical instruments and methods, preparation of alkali metal sulfites, iron oxides, etc., can solve problems such as restricting long-term development and environmental hazards, and achieve high comprehensive utilization of resources and dehydration. Clean, low energy consumption

Active Publication Date: 2013-10-02
玉门市翔宇环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since these companies have been producing for many years, all the discarded ferrous sulfate has been piled up, which has caused great harm to the local environment and seriously restricted the healthy and long-term development of these companies. The harmless treatment of discarded ferrous sulfate Processing is imminent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Ferrous sulfate comprehensive utilization method comprises the following steps:

[0023] ⑴The raw material FeSO 4 ·7H 2 O was added to the dissolution tank, and at the same time, steam at 90°C was passed into the dissolution tank, and a solution was obtained after 40 minutes; FeSO 4 ·7H 2 The mass ratio of O to steam is 1t: 1.1t.

[0024] (2) The solution is pumped into the evaporating kettle through the dissolving tank pump, and the evaporating kettle is heated with steam at 90°C. After 4 hours, water vapor, FeSO 4 ·H 2 O and FeSO 4 The mixture; the water vapor is sucked away by the vacuum pump under the condition of vacuum degree of -0.2MPa, and the water vapor is cooled into water by the condensed water in the heat exchanger, and recovered.

[0025] (3) FeSO 4 ·H 2 O and FeSO 4 The mixture is sent to the filter tank, and is filtered by a vacuum pump under the condition of a vacuum of -0.2MPa to obtain mother liquor and dry material respectivel...

Embodiment 2

[0031] Example 2 Ferrous sulfate comprehensive utilization method comprises the following steps:

[0032] ⑴The raw material FeSO 4 ·7H 2 O was added to the dissolution tank, and steam at 120°C was passed into the dissolution tank at the same time, and a solution was obtained after 20 minutes; FeSO 4 ·7H 2 The mass ratio of O to steam is 1t: 1.3t.

[0033] (2) The solution is pumped into the evaporating kettle through the dissolving tank pump, and the evaporating kettle is heated by steam at 120°C. After 2 hours, water vapor, FeSO 4 ·H 2 O and FeSO 4The mixture; the water vapor is sucked away by the vacuum pump under the condition of vacuum degree of -0.4MPa, and the water vapor is cooled into water by the condensed water in the heat exchanger, and recovered.

[0034] (3) FeSO 4 ·H 2 O and FeSO 4 The mixture is sent to the filter tank, and is filtered by a vacuum pump under the condition of a vacuum of -0.4MPa to obtain mother liquor and dry material respectively...

Embodiment 3

[0040] Example 3 Ferrous sulfate comprehensive utilization method comprises the following steps:

[0041] ⑴The raw material FeSO 4 ·7H 2 O was added to the dissolving tank, and steam at 100°C was introduced into the dissolving tank at the same time, and a solution was obtained after 30 min; FeSO 4 ·7H 2 The mass ratio of O to steam is 1t:1.2t.

[0042] (2) The solution is pumped into the evaporating kettle through the dissolving tank pump, and the evaporating kettle is heated with steam at 100°C. After 3 hours, water vapor, FeSO 4 ·H 2 O and FeSO 4 The mixture; the water vapor is sucked away by the vacuum pump under the condition of vacuum degree of -0.3MPa, and the water vapor is cooled into water through the condensed water in the heat exchanger, and recovered.

[0043] (3) FeSO 4 ·H 2 O and FeSO 4 The mixture is sent to the filter tank, and is filtered by a vacuum pump under the condition of a vacuum of -0.3MPa to obtain mother liquor and dry material respect...

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PUM

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Abstract

The invention relates to a ferrous sulfate comprehensive utilization method. The ferrous sulfate comprehensive utilization method comprises the following steps of 1, dissolving FeSO4.7H2O as a raw material by steam to obtain a solution, 2, heating the solution for 2 to 4h to respectively obtain steam and a mixture of FeSO4.H2O and FeSO4, cooling the steam into water and recovering the water, 3, carrying out suction filtration of the mixture of FeSO4.H2O and FeSO4 to respectively obtain a mother liquor and a dry material, 4, calcining the dry material to respectively obtain iron oxide red and impurity-containing SO2 gas, and crushing the iron oxide red into an iron oxide red finished product, 5, carrying out spray purification of the impurity-containing SO2 gas orderly by first-grade and second-grade washing towers and removing spray to obtain purified SO2 gas, 6, carrying out a reaction of the purified SO2 gas and a sodium carbonate solution to respectively obtain CO2 gas and a sodium bisulfate solution, 7, carrying out a neutralization reaction of the sodium bisulfate solution and the sodium carbonate solution to obtain a sodium sulfite solution, and 8, carrying out condensation and separation of the sodium sulfite solution and carrying out drying to constant weight to obtain an anhydrous sodium sulfite finished product. The ferrous sulfate comprehensive utilization method realizes recovery and use of all resources and has a high resource comprehensive utilization rate.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide production, in particular to a comprehensive utilization method of ferrous sulfate. Background technique [0002] Southwest my country is rich in vanadium-titanium magnetite, and the proven industrial reserves of titanium dioxide have reached 950 million tons. To strengthen and expand the vanadium-titanium industry, titanium dioxide plays an important role. Titanium dioxide is the white pigment with the best performance in the world. It is widely used in coatings, plastics, papermaking, ink, rubber, chemical fiber, enamel, welding electrodes and other industries. Due to the further expansion of its field, titanium dioxide has entered the daily life In various fields, it has become an important inorganic chemical product, and its annual sales volume ranks third among inorganic chemical products, second only to synthetic ammonia and phosphoric acid. At present, 90% of the utilization of ti...

Claims

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Application Information

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IPC IPC(8): C01G49/06C01B5/00C01D5/14
Inventor 刘正安陈书勤王元寿马海斌李立顺徐陵生
Owner 玉门市翔宇环保有限公司
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