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Method for washing titanium dioxide by utilizing high-ammonia-nitrogen wastewater

A high-ammonia-nitrogen, waste water technology, applied in the field of titanium dioxide production, can solve the problems of secondary pollution, long time-consuming biological process, not meeting the water requirements for washing titanium dioxide, etc., and achieve the effect of saving consumption

Pending Publication Date: 2022-07-12
LOMON BILLIONS GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the concentration process of sodium chloride, the ammonia nitrogen in sodium chloride enters the evaporating condensed water with the concentration of brine, resulting in a high ammonia nitrogen content (the content of ammonia nitrogen in the evaporating condensed water is about 60-110mg / L), which is not suitable for washing titanium white water requirements
[0004] The removal methods of ammonia nitrogen in wastewater in the prior art mainly include biological method, ion exchange method, break point chlorination method, air stripping method, steam stripping method, etc. The biological method takes a long time and has low efficiency, and the ion exchange method needs frequent regeneration of the resin. Difficult to operate, the breakpoint chlorine addition method needs to consume a large amount of chloride ions, causing secondary pollution, stripping method and stripping method, need to use its corresponding packed tower or plate tower to remove ammonia nitrogen

Method used

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  • Method for washing titanium dioxide by utilizing high-ammonia-nitrogen wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Reaction of titanium chloride waste acid with calcium carbide mud, and related chemical transformations to convert calcium chloride into sodium chloride solution;

[0042] 2. In order to ensure that the sodium chloride required for electrolysis meets the requirements, the sodium chloride solution is subjected to MVR evaporation and crystallization;

[0043] 3. Collect MVR evaporative condensate water, the outlet water temperature is 95°C, after heat exchange by heat exchanger, the water temperature is 32°C, the ammonia nitrogen content is 85mg / L, the carbonate content is 85mg / L, and the Cl content is 16mg / L, Use sodium hydroxide to adjust the pH to 10.0;

[0044] 4. The condensed water after pH adjustment is sent to the titanium white empty tower as spray liquid for dust removal and cooling. The temperature of the empty tower is 85°C, the gas velocity is 12m / s, the pressure in the empty tower is 500pa, and the amount of condensed water evaporated after spraying is 7...

Embodiment 2

[0048] 1. Titanium chloride waste acid reacts with calcium carbide mud, and undergoes relevant chemical transformations to convert calcium chloride into sodium chloride solution;

[0049] 2. In order to ensure that the sodium chloride required for electrolysis meets the requirements, the sodium chloride solution is subjected to MVR evaporation and crystallization;

[0050] 3. Collect MVR evaporative condensate water, the outlet water temperature is 98°C, after heat exchange by the heat exchanger, the water temperature is 31°C, the ammonia nitrogen content is 96mg / L, the carbonate content is 90mg / L, and the Cl content is 16mg / L, Use sodium hydroxide to adjust the pH to 10.3;

[0051] 4. The condensed water after pH adjustment is sent to the titanium white empty tower as spray liquid for dust removal and cooling. The temperature of the empty tower is 90℃, the gas velocity is 13m / s, the pressure in the empty tower is 800pa, and the amount of condensed water evaporated after spray...

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Abstract

The invention provides a method for washing titanium dioxide by using high-ammonia-nitrogen wastewater. The method comprises the following steps: S1, adjusting the pH value of evaporation condensate water to 9.5-10.5; s2, conveying the pH-adjusted evaporation condensate water to an empty tower of a titanium dioxide production steam powder working section as a spray liquid for dust removal and cooling; s3, collecting the sprayed evaporation condensate water for titanium dioxide third washing until the conductivity of the washing water is the same as that of the non-sprayed evaporation condensate water; and S4, washing the titanium dioxide with desalted water until the conductivity is qualified. According to the method, the titanium dioxide empty tower is adopted to replace a conventional stripping tower for the high-ammonia-nitrogen evaporation condensate water obtained after treatment of the chlorinated titanium dioxide waste acid, high-temperature gas is used for direct gas-liquid contact, the ammonia nitrogen of the evaporation condensate water is efficiently reduced to be smaller than 1 mg or below, the purpose that the evaporation condensate water is used for titanium dioxide water washing is achieved, and the dosage of primary desalted water is effectively saved.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide production, and particularly relates to a method for washing titanium dioxide with high ammonia nitrogen wastewater. Background technique [0002] For titanium dioxide, water washing is to remove impurities generated during the preparation process, so as to ensure that the powder properties of titanium dioxide, such as whiteness, are not affected. However, for the water quality used for washing titanium dioxide, the requirements are often higher, and desalinated water is generally used. For desalinated water, there are clear requirements for ammonia nitrogen and salt content in the water. [0003] In the production process of chlorinated titanium dioxide, a large amount of chlorinated titanium dioxide waste acid is produced. A method for treating the chlorinated titanium dioxide waste acid adopted in the prior art firstly combines the chlorinated titanium dioxide waste acid with calcium ...

Claims

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Application Information

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IPC IPC(8): C01G23/047C02F1/02B01D47/06
CPCC01G23/0475C02F1/02B01D47/06C02F2101/16Y02P20/10
Inventor 李丽娜张玉荣周文静肖莎莎豆君陈建立贺高峰
Owner LOMON BILLIONS GRP CO LTD