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Method for producing concrete early-strength anti-freezing agent from heavy-metal-containing waste nitric acid

A technology for concrete and waste nitric acid, which is applied in the field of hazardous waste resource utilization and building materials, can solve problems such as secondary pollution, and achieve the effect of improving the ability of early strength and antifreeze

Inactive Publication Date: 2018-10-09
萧县沃德化工科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A little carelessness will cause the possibility of secondary pollution

Method used

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  • Method for producing concrete early-strength anti-freezing agent from heavy-metal-containing waste nitric acid
  • Method for producing concrete early-strength anti-freezing agent from heavy-metal-containing waste nitric acid
  • Method for producing concrete early-strength anti-freezing agent from heavy-metal-containing waste nitric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of method that utilizes waste nitric acid containing heavy metal to produce concrete early-strength antifreeze, comprises the following steps:

[0034] (1) Get a certain amount of waste nitric acid solution containing heavy metals and place it in the container for slow stirring, and slowly add liquid caustic soda; if the temperature rises too fast in the process of dripping liquid caustic soda, then stop dripping liquid caustic soda until the temperature decreases, except In addition, cooling measures can also be taken, such as using cooling water to cool down;

[0035] (2) the pH value of test solution, when pH value is 8, stop dripping liquid caustic soda, continue to stir, treat that temperature is down to room temperature, obtain emulsion, obtain described concrete early-strength antifreeze, and measure concrete early-strength antifreeze solid content of the agent.

Embodiment 2

[0037] A kind of method that utilizes waste nitric acid containing heavy metal to produce concrete early-strength antifreeze, comprises the following steps:

[0038] (1) Get a certain amount of waste nitric acid solution containing heavy metals and place it in a container for slow stirring, and slowly add liquid caustic soda; if the temperature rises too fast in the process of dripping liquid caustic soda, then stop dripping liquid caustic soda until the temperature decreases, except In addition, cooling measures can also be taken, such as using cooling water to cool down;

[0039] (2) the pH value of test solution, when the pH value is 9, stop dripping liquid caustic soda, continue stirring, treat that temperature is down to room temperature, obtain emulsion, obtain described concrete early-strength antifreeze, and measure concrete early-strength antifreeze solid content of the agent.

Embodiment 3

[0041] A kind of method that utilizes waste nitric acid containing heavy metal to produce concrete early-strength antifreeze, comprises the following steps:

[0042] (1) Get a certain amount of waste nitric acid solution containing heavy metals and place it in a container for slow stirring, and slowly add liquid caustic soda; if the temperature rises too fast in the process of dripping liquid caustic soda, then stop dripping liquid caustic soda until the temperature decreases, except In addition, cooling measures can also be taken;

[0043](2) the pH value of test solution, when pH value is 10, stop dripping liquid caustic soda, continue to stir, treat that temperature is down to room temperature, obtain emulsion, obtain described concrete early strength antifreeze, and measure concrete early strength antifreeze solid content of the agent.

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PUM

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Abstract

The invention provides a method for producing a concrete early-strength anti-freezing agent from heavy-metal-containing waste nitric acid. The method includes steps: (1) slowly adding sodium hydroxideinto heavy-metal-containing waste nitric acid solution while stirring; (20 testing a pH value of the solution, stopping adding sodium hydroxide when the pH value is 8-13, continuing stirring to obtain the concrete early-strength anti-freezing agent after the temperature drops to the room temperature. By adoption of excessive sodium hydroxide for neutralization of waste nitric acid, the nitric acid is converted into sodium nitrate, heavy metals in the waste nitric acid are converted into harmless insoluble substances under alkali or weak alkali conditions, sodium nitrate can serve as the concrete early-strength anti-freezing agent to be applied to winter concrete construction, concrete early-strength anti-freezing performance is improved, and waste recyclability is realized.

Description

technical field [0001] The invention relates to the field of resource utilization of hazardous waste and building materials, in particular to a method for producing concrete early-strength antifreeze by using waste nitric acid containing heavy metals. Background technique [0002] Nitric acid is a relatively common acid with a wide range of applications, mainly used in the chemical and steel industries. In many application processes, the utilization rate of nitric acid is relatively low, and a large amount of nitric acid is discharged along with the wastewater containing nitric acid. If the waste water is discharged into the environment without treatment, it will not only acidify the soil and water, cause harm to the ecological environment, but also endanger the safety of humans and animals. [0003] In recent years, my country has formulated strict emission standards. In addition to being acidic, waste nitric acid also contains a large amount of impurities. According to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/06C04B103/12C04B103/60
CPCC04B40/0039C04B2103/12C04B2103/601C04B22/062C04B18/0472
Inventor 刘景相马丽涛董翠平王浩雨邢凯
Owner 萧县沃德化工科技有限公司