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A method for preparing concrete early-strength antifreeze by using waste sulfuric acid containing heavy metals

A technology of waste sulfuric acid and concrete, which is applied in the field of resource utilization of hazardous waste and building materials, can solve problems such as secondary pollution, achieve recycling, and improve the effect of early-strength anti-freezing ability

Inactive Publication Date: 2020-04-17
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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  • A method for preparing concrete early-strength antifreeze by using waste sulfuric acid containing heavy metals
  • A method for preparing concrete early-strength antifreeze by using waste sulfuric acid containing heavy metals
  • A method for preparing concrete early-strength antifreeze by using waste sulfuric acid containing heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of method that utilizes waste sulfuric acid containing heavy metal to prepare concrete early-strength antifreeze comprises the following steps:

[0033] (1) Get a certain amount of waste sulfuric 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;

[0034] (2) the pH value of test solution, when the 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

[0036] A kind of method that utilizes waste sulfuric acid containing heavy metal to prepare concrete early-strength antifreeze comprises the following steps:

[0037] (1) Get a certain amount of waste sulfuric 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;

[0038] (2) the pH value of test solution, when the pH value is 9, stop dripping liquid caustic soda, continue to stir, treat that temperature is down to room temperature, obtain emulsion, promptly get described concrete early-strength antifreeze, and measure concrete early-strength antifreeze solid content of the agent.

Embodiment 3

[0040] A kind of method that utilizes waste sulfuric acid containing heavy metal to prepare concrete early-strength antifreeze comprises the following steps:

[0041] (1) Get a certain amount of waste sulfuric 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;

[0042](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 preparing a concrete early strengthening anti-freezing agent from heavy-metal-containing waste sulphuric acid. The method comprises the following steps of (1) slowly adding sodium hydroxide into the heavy-metal-containing waste sulphuric acid solution during the stirring; (2) testing the pH value of the solution; when the pH value is 8 to 13, stopping the addition of the sodium hydroxide; continuously performing stirring; after the temperature is lowered to the room temperature, obtaining emulsion; obtaining the concrete early strengthening anti-freezing agent. The excessive sodium hydroxide is used for neutralizing the waste sulphuric acid; the sulphuric acid is converted into sodium sulfate; under the basic or weak basic conditions, the heavy metal inthe waste sulphuric acid is converted into harmless insoluble materials; the sodium sulfate can be applied to concrete winter construction as concrete early strengthening anti-freezing agents; the early strengthening anti-freezing capability is improved; waste materials are changed into valuable materials; the regeneration utilization of dangerous waste can be realized; the dual effects of resource saving and environmental protection are achieved.

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 preparing a concrete early-strength antifreeze by using waste sulfuric acid containing heavy metals. Background technique [0002] Sulfuric 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 sulfuric acid is relatively low, and a large amount of sulfuric acid is discharged along with the wastewater containing sulfuric 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 sulfuric acid also contains a large amount of impurities. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/02C04B22/14C04B103/60
CPCC01D5/02C04B22/147C04B2103/601
Inventor 马丽涛刘景相彭城董翠平王浩雨
Owner 萧县沃德化工科技有限公司