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A kind of processing method of waste sulfuric acid solution

A treatment method, a technology for waste sulfuric acid, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve problems such as ineffective utilization of raw materials, environmental pressure, etc.

Active Publication Date: 2016-03-02
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 disadvantages of using the existing method to process the waste sulfuric acid solution produced by the sulfuric acid method to prepare titanium dioxide by-products, which not only cannot effectively utilize raw materials, but also causes greater pressure to the environment, and provides a A kind of method that can effectively treat the waste sulfuric acid solution that adopts the sulfuric acid method to prepare the by-product of titanium dioxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment is used to illustrate the treatment method of the waste sulfuric acid solution provided by the present invention.

[0035] (1) Green vitriol removes crystal water:

[0036] 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.

[0037] 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 rotar...

Embodiment 2

[0041] This embodiment is used to illustrate the treatment method of the waste sulfuric acid solution provided by the present invention.

[0042] (1) Green vitriol removes crystal water:

[0043] 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.

[0044] (2) Tr...

Embodiment 3

[0047] This embodiment is used to illustrate the treatment method of the waste sulfuric acid solution provided by the present invention.

[0048] (1) Green vitriol removes crystal water:

[0049] 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.

[0050] 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 ...

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Abstract

The invention provides a waste sulfuric acid solution treatment method. The above waste sulfuric acid solution contains sulfuric acid and ferrous sulfate, the concentration of sulfuric acid in the waste sulfuric acid solution is not higher than 20wt%. The method comprises the following steps: removing crystal water in copperas, calcining, allowing exhaust gas obtained after the calcining to have first contact with the waste sulfuric acid solution until the concentration of sulfuric acid in the waste sulfuric acid solution reaches 45-50wt%, carrying out solid-liquid separation on the waste sulfuric acid solution, and allowing the above obtained filtrate to continuously have second contact with the exhaust gas. The method enables the waste sulfuric acid solution to be purified and reused, so the waste raw material can be effectively used, the pressure to the environment can be mitigated, and the method has a great industrial application prospect.

Description

technical field [0001] The invention relates to a treatment method for waste sulfuric acid solution. 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 general...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/74
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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