Method for removing crystal water in green vitriol

A technology for removing crystallization water and crystallization water, applied in the direction of ferric sulfate, etc., can solve the problems of scaling and sticking of drying equipment

Active Publication Date: 2014-09-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the existing method to remove the crystal water in the green vitriol, which is easy to cause fouling and sticky walls of the drying equipment, and to provide a method for removing the green vitriol that is not easy to cause scaling and sticky walls of the equipment. Crystal water method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example is used to illustrate the method for removing crystal water from green vitriol provided by the present invention.

[0028] The green alum was removed in a centrifuge to remove free water, and then placed in a blast oven whose temperature was set at 50-60° C. for 8 hours to be dried by blasting to obtain ferrous sulfate monohydrate.

[0029] 7 parts by weight of green vitriol to be removed from crystal water and 3 parts by weight of ferrous sulfate monohydrate obtained according to the above method are mixed and added to the rotary kiln (purchased from Beijing Zhuochuan Electronic Technology Co., Ltd., model is ZZ99-SHY -I), the rotary kiln is continuously fed with air at a temperature of 30 °C (based on 1 kg of green alum to be removed from crystal water, the air flow rate is 1 m 3 / h), and dried at a temperature of 60 °C for 5 hours, then the temperature of the rotary kiln was raised to 120 °C for 2 hours, and then the temperature of the rotary kiln was ra...

Embodiment 2

[0031] This example is used to illustrate the method for removing crystal water from green vitriol provided by the present invention.

[0032] 7 parts by weight of green vitriol to be removed from crystal water and 2.5 parts by weight of anhydrous ferrous sulfate (prepared according to the method of Example 1) are mixed and added to the rotary kiln, and the continuous feeding temperature in the rotary kiln is 350 °C. ℃ air (based on 1kg of green alum to be removed from crystal water, the flow rate of air is 1m 3 / h), and dried at 80 °C for 2 hours, then the temperature of the rotary kiln was raised to 100 °C for 1 hour, and then the temperature of the rotary kiln was raised to 350 °C for 1 hour to obtain anhydrous ferrous sulfate. . The results show that there is no scaling or sticking in the rotary kiln, and the production capacity of the rotary kiln is 14kg anhydrous ferrous sulfate / hour.

Embodiment 3

[0034] This example is used to illustrate the method for removing crystal water from green vitriol provided by the present invention.

[0035]The green alum was removed in a centrifuge to remove free water, and then placed in a blast oven whose temperature was set at 50-60° C. for 8 hours to be dried by blasting to obtain ferrous sulfate monohydrate.

[0036] 7 parts by weight of green vitriol to be removed from crystal water and 2.75 parts by weight of ferrous sulfate monohydrate obtained according to the above method are mixed and added into the rotary kiln, and the air (with a temperature of 150° C.) is continuously fed into the rotary kiln. 1kg of green alum to be removed from crystal water is the benchmark, and the air flow is 1m 3 / h), and dried at 70°C for 2 hours, then the temperature of the rotary kiln was raised to 110°C for 1 hour, and then the temperature of the rotary kiln was raised to 320°C for 1.5 hours to obtain anhydrous ferrous sulfate. . The results show ...

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PUM

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Abstract

The invention provides a method for removing crystal water in green vitriol. The method for removing the crystal water in the green vitriol comprises mixing and drying of the green vitriol and ferrous sulfate monohydrate and / or anhydrous ferrous sulfate for removing the crystal water. By use of the method for removing the crystal water in the green vitriol, scale formation and wall sticking phenomenon in the process of drying of the green vitriol can be very effectively avoided, so that the drying process can be smooth.

Description

technical field [0001] The invention relates to a method for removing crystal water in green alum. Background technique [0002] Titanium dioxide is an excellent white pigment, which is widely used in paints, coatings, papermaking, plastics and welding rods and other industries. [0003] At present, the main processes for producing titanium dioxide are sulfuric acid method and chlorination method. The two processes coexist, and the production capacity and output are very large. However, both production processes have certain environmental pressures. For the sulfuric acid production process, a large amount of hydrolyzed waste acid and green vitriol (FeSO4) containing seven crystal waters will be produced in the production process. 4 ·7H 2 O). When the titanium concentrate (the main component is iron metatitanate FeTiO 3 , in which the content of titanium dioxide is 45-50% by weight) as the raw material, generally producing 1 ton of titanium dioxide will yield 3.5-4 tons ...

Claims

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Application Information

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IPC IPC(8): C01G49/14
Inventor 穆宏波穆天柱邓斌赵三超闫蓓蕾朱福兴彭卫星
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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