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Environment-friendly method for processing waste acid in titanium dioxide production and recycling of processed residue

An environmental protection treatment, titanium dioxide technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Acid treatment of secondary pollution problems, etc., to achieve obvious effects of economic significance and environmental protection significance

Active Publication Date: 2014-10-15
梅卫东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with using ammonia water to neutralize waste acid is that the ammonium and nitrogen remaining in the wastewater cannot be removed and become a secondary pollution source
[0009] The above method either does not solve the problem of secondary pollution after waste acid treatment, or the treatment cost is high

Method used

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  • Environment-friendly method for processing waste acid in titanium dioxide production and recycling of processed residue

Examples

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Effect test

Embodiment 1

[0047] Take 100kg of waste acid and put it into the reaction tank ①, add 2.5kg of phosphoric acid when the steam is heated to more than 70°C, keep the temperature of the waste acid at 90°C to 100°C, stop heating after a large amount of precipitation, and let it stand for 12 hours. Use a plate and frame filter press to filter, remove the iron from the filter residue according to the bleaching method in the production of titanium dioxide, wash it, and then roast it at 400°C to 450°C to obtain titanium phosphate. Put the filtrate into the reaction tank ②, add 30kg of waste magnesia knotting material passed through a 150-mesh sieve, and react for 4 hours. When the temperature of the reaction liquid drops below 50°C, send it to a plate and frame filter press for pressure filtration, and send the filter cake to the vanadium extraction process. The filtrate is sent to the reaction tank ③, and the pH value is adjusted to 8 with a sodium hydroxide solution below 40wt% to form a ferrous...

Embodiment 2

[0050] Take 100kg of waste acid and put it into the reaction tank ①, add 2.5kg of phosphoric acid when the steam is heated to more than 70°C, keep the temperature of the waste acid at 70°C to 80°C, stop heating after a large amount of precipitation, and let it stand for 12 hours. Use a plate and frame filter press to filter, remove the iron from the filter residue according to the bleaching method in the production of titanium dioxide, wash it, and then roast it at 400°C to 450°C to obtain titanium phosphate. The filtrate is sent to the reaction tank ② Add 35 kg of waste magnesia knotting material that has passed through a 150-mesh sieve, react for 4 hours, send it to a plate and frame filter press for pressure filtration after cooling, and the filter cake is discarded residue. The filtrate is sent into the reaction tank 3., adjust the pH value to 8 with 25%wt sodium carbonate solution, leave standstill for 1.5 hours after adding the lye, send it into the filter press for press...

Embodiment 3

[0053] Take 100kg of waste acid and put it into the reaction tank ①, add 2.5kg of phosphoric acid when the steam is heated to more than 70°C, keep the temperature of the waste acid at 70°C to 80°C, stop heating after a large amount of precipitation, and let it stand for 12 hours. Use a plate and frame filter press to filter, remove the iron from the filter residue according to the bleaching method in the production of titanium dioxide, wash it, and then roast it at 400°C to 450°C to obtain titanium phosphate. The filtrate is sent to the reaction tank ② and 40 kg of ore dressing tailings are added, reacted for 5 hours, and sent to the plate and frame filter press after cooling. After the filter cake is washed, it is used to recover chromium. The pH value of the solution is adjusted to 8, and the filtrate forms a ferrous hydroxide precipitate. After standing for 1 hour, it is sent to a plate and frame filter press for pressure filtration, and the filter cake is sent to a cleaning...

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Abstract

The invention belongs to the field of titanium dioxide production, particularly relates to an environment-friendly method for processing waste acid in titanium dioxide production and recycling of processed residues and aims to solve the technical problem of providing the environment-friendly method, which is capable of separating and recycling various materials in the waste acid, for processing the waste acid in the titanium dioxide production. In order to solve the technical problem, the adopted technical scheme comprises the following steps: phosphoric acid and raw materials containing magnesium are sequentially added in the waste acid to precipitate and separate titanium phosphate and to neutralize sulfuric acid so as to adjust the pH value to precipitate ferrous hydroxide and then to precipitate magnesium compound; then barium chloride is added to generate barium sulphate precipitation; finally, water is subjected to adsorption processing and reaches the industrial wastewater discharge standard. According to the method, as the resource materials in the waste acid are separated and extracted, the economic benefits are brought while the waste acid is processed.

Description

technical field [0001] The invention belongs to the field of titanium dioxide production, and in particular relates to an environment-friendly treatment method for titanium dioxide production waste acid and the reuse of treatment slag. Background technique [0002] The sulfuric acid method is the main method for producing titanium dioxide in my country. The production of 1 ton of titanium dioxide produces 8 tons of waste acid, which contains 20-23% sulfuric acid, 5-8% ferrous sulfate, and 2-3% titanyl sulfate. The direct discharge of waste acid will cause great damage to the environment. [0003] At present, there are mainly the following types of waste acid treatment methods: [0004] 1. Use waste acid to leach useful elements in ore. For example, phosphate ore is leached with waste acid to make phosphate fertilizer, and manganese ore is leached with waste acid to make manganese sulfate. This type of method has the problems of secondary pollution and high processing cost...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01B25/37
Inventor 梅卫东陈德学
Owner 梅卫东
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