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A method for removing water of crystallization in 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 wall sticking of drying equipment

Active Publication Date: 2016-01-20
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 embodiment is used to illustrate the method for removing the water of crystallization in the green vitriol provided by the invention.

[0028] Remove the free water in the centrifuge, and then place it in a blast oven set at 50-60° C. for 8 hours to obtain ferrous sulfate monohydrate.

[0029] Mix 7 parts by weight of green vitriol to be removed of crystal water with 3 parts by weight of ferrous sulfate monohydrate obtained by the above method, and then add it to the rotary kiln (purchased from Beijing Zhuochuan Electronic Technology Co., Ltd., model ZZ99-SHY -I) In the rotary kiln, air with a temperature of 30°C is continuously introduced into the rotary kiln (based on 1kg of green vitriol to be removed from the crystal water, the flow rate of the air is 1m 3 / h), and dried at a temperature of 60°C for 5 hours, then raised the temperature of the rotary kiln to 120°C for 2 hours, and then raised the temperature of the rotary kiln to 300°C for 5 hours to obtain anhy...

Embodiment 2

[0031] This embodiment is used to illustrate the method for removing the water of crystallization in the green vitriol provided by the invention.

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

Embodiment 3

[0034] This embodiment is used to illustrate the method for removing the water of crystallization in the green vitriol provided by the invention.

[0035]Remove the free water in the centrifuge, and then place it in a blast oven set at 50-60° C. for 8 hours to obtain ferrous sulfate monohydrate.

[0036] 7 parts by weight of green vitriol to be removed of crystal water and 2.75 parts by weight of ferrous sulfate monohydrate obtained by the above method are mixed evenly and added to the rotary kiln, and the temperature of 150 ° C is continuously fed into the rotary kiln. 1kg of green vitriol to be removed of crystal water is used as the benchmark, and the air flow rate is 1m 3 / h), and dried at a temperature of 70°C for 2 hours, then raised the temperature of the rotary kiln to 110°C for 1 hour, and then raised the temperature of the rotary kiln to 320°C for 1.5 hours to obtain anhydrous ferrous sulfate . The results show that there is no fouling and wall sticking phenomenon ...

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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 vitriol. Background technique [0002] Titanium dioxide is an excellent white pigment, which is widely used in paints, coatings, paper, plastics and welding electrodes and other industries. [0003] At present, the processes for producing titanium dioxide mainly include the sulfuric acid method and the 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 hydrolysis waste acid and green vitriol (FeSO 4 ·7H 2 o). When titanium concentrate (the main component is iron metatitanate FeTiO 3 , wherein the content of titanium dioxide is 45-50% by weight) as the raw material, generally producing 1 ton of titanium dioxide will produce 3.5-4 tons of heptahydrate green vitriol. [0004] Green vitriol is generally us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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