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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 wall sticking of drying equipment

Active Publication Date: 2014-09-17
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

[0008] The purpose of the present invention is to overcome adopting existing method to remove the crystal water in green vitriol to easily cause the defective of scaling of drying equipment, sticking to the wall, and to provide a kind of desiccant that is not easy to cause equipment fouling, sticking to the wall in the removal of green vitriol Crystal water method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment is used to illustrate the method for removing the water of crystallization in the green vitriol provided by the invention.

[0026] Mix 100 parts by weight of green vitriol to be removed of crystal water and 5 parts by weight of calcium oxide evenly, and then add it to the rotary kiln (purchased from Beijing Zhuochuan Electronic Technology Co., Ltd., model ZZ99-SHY-I). In the rotary kiln Continuously feed air at a temperature of 30°C (based on 1kg of green vitriol to be removed from crystal water, the flow rate of the air is 0.5m 3 / h), and dried at a temperature of 60°C for 2 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 2 hours 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 15kg anhydrous ferrous sulfate / hour.

Embodiment 2

[0028] This embodiment is used to illustrate the method for removing the water of crystallization in the green vitriol provided by the invention.

[0029] Mix 100 parts by weight of green vitriol to be removed of crystal water and 10 parts by weight of calcium hydroxide evenly and then add it into the rotary kiln, and continuously feed air at a temperature of 100°C in the rotary kiln (with 1kg of water to be removed of crystal water Green vitriol as a benchmark, the flow rate of the air is 1.0m 3 / h), and dried at a temperature of 80°C for 1.5 hours, then raised the temperature of the rotary kiln to 100°C for 1.5 hours, 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 16kg anhydrous ferrous sulfate / hour.

Embodiment 3

[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 100 parts by weight of green vitriol to be removed of crystal water, 5 parts by weight of calcium oxide and 3 parts by weight of calcium hydroxide and add them 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 0.7m 3 / h), and dried at a temperature of 70°C for 1 hour, 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 in the rotary kiln, and the production capacity of the rotary kiln is 13kg anhydrous ferrous sulfate / hour.

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Abstract

The invention provides a method for removing crystal water in green vitriol. The method comprises the following steps: mixing green vitriol with calcium oxide and / or calcium hydroxide, and drying to remove the crystal water. The method can be used to remove the crystal water in the green vitriol, and can effectively avoid the fouling and adhering on a wall of green vitriol in the drying process to realize smooth drying.

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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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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