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Method for treating sawage generated by preparing carbide slag

A calcium carbide slag slurry and wastewater treatment technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of long treatment time, high treatment cost and high operating cost, To achieve the effect of rapid and thorough response, low processing cost and short construction period

Inactive Publication Date: 2006-12-06
余荪培
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The project investment is large, and the construction of a treatment project for processing 300 tons of calcium carbide slurry wastewater per hour requires an investment of about 15 million yuan; due to the use of strong oxidants such as permanganate, the operating cost is high, and the treatment cost is 4 yuan (RMB) / cubic More than one meter, the annual processing cost is as high as 8 to 10 million yuan
Catalytic oxidation also has the following disadvantages: ①, hydrogen sulfide gas is discharged indiscriminately during the treatment process, causing air pollution, and many unsafe factors are hidden; ②, manganese belongs to heavy metals, resulting in heavy metal pollution
The disadvantages are: the treatment time is long, the treatment is not thorough, and some pollutants are still transferred to the air, the removal rate can only reach 90%, the treatment cannot meet the standard, and the effect is not stable; the pH value of the treated water is about 3, and it is still Acid and alkali neutralization treatment is required; operating costs and treatment engineering investment are still large

Method used

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  • Method for treating sawage generated by preparing carbide slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Using ferrous sulfate for precipitation

[0037] see figure 1 : The calcium carbide slurry wastewater is collected into the sump, and then sent to the regulating tank to adjust the concentration of pollutants in the wastewater, so that it is basically stable (the concentration of pollutants is not affected by a special production process), so as to be suitable for the technological conditions of the subsequent process. Detect the concentration of sulfide in wastewater.

[0038] Send the wastewater from the adjustment tank into the reaction tank, and add ferrous sulfate (FeSO 4 ) solution, at normal temperature and pressure, the following reaction occurs:

[0039]

[0040] Continue to stir until no black precipitate continues to be produced, the time is about 5 minutes, and the pH value of the water is controlled to 6.7;

[0041] Due to the Ca in wastewater 2+ low enough to form CaSO 4 Precipitation, almost all of which is ferrous sulfide (FeS).

[0...

Embodiment 2

[0058] Example 2 Using Zinc Sulfate Precipitation

[0059] Send the wastewater from the adjustment tank to the reaction tank, and add zinc sulfate (ZnSO 4 ) solution, at normal temperature and pressure, the following reaction occurs:

[0060]

[0061] Continue to stir until no white precipitate continues to be produced, the time is about 5 minutes, and the pH value of the water is controlled to 6.7;

[0062] Send the waste water after the above reaction into the sedimentation tank and let it stand for about 25 minutes to make the sediment settle and separate the solid and liquid. Since zinc sulfide (ZnS) is insoluble in water, it can be separated through natural sedimentation, and the supernatant is sent back The acetylene generation section is recycled or discharged, and the precipitate is sent to a closed reactor;

[0063] Add dilute sulfuric acid (H 2 SO 4 ), at normal temperature and pressure, the following acidolysis reaction occurs with zinc sulfide (ZnS) in t...

Embodiment 3

[0069] Example 3 Use of hydrochloride precipitation

[0070] Send the wastewater from the regulating tank into the reaction tank, and add ferrous chloride (FeCl 2 ) solution, at normal temperature and pressure, the following reaction occurs:

[0071]

[0072] Continue to stir until no black precipitate continues to be produced, the time is about 5 minutes, and the pH value of the water is controlled to be 6.9;

[0073] Send the waste water after the above reaction into the sedimentation tank and let it stand for about 25 minutes to make the sediment settle and separate the solid and liquid. Since ferrous sulfide (FeS) is insoluble in water, it can be separated through natural sedimentation; the supernatant is sent to Back to the acetylene generation section for recycling or discharge, and the precipitate is sent to the closed reactor;

[0074] Add dilute hydrochloric acid (HCl content is 25%) to airtight reactor, under normal temperature, normal pressure, following ac...

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Abstract

A process for treating the sewage generated by preparing acetylene from calcium carbide includs such steps as adding the solution of the Fe salt, Zn salt and Cu salt to the sewage to make the pollutants become metal compounds, depositing, acid hydrolyzing to generate H2S gas and the solution of Fe salt, En salt and Cu salt, spraying NaOH solution to absorb H2S and generate sodium sulfide (or hydrosulfide), and reusing said solution to treat sewage.

Description

technical field [0001] The invention relates to a treatment method for industrial waste water, in particular to a treatment method for waste water produced in the process of preparing acetylene from calcium carbide. Background technique [0002] The production of acetylene from calcium carbide in my country is mainly used in the resin industry, and the calcium carbide used for the production of PVC accounts for more than 50% of the production of calcium carbide in my country. Due to the low cost of producing resin through calcium carbide raw material route, which is 30%-40% lower than that of petroleum cracking to produce PVC, my country’s oil resources are insufficient. With the sharp rise in oil prices, the raw material route of calcium carbide has a greater cost advantage. It has become the main raw material route for vinyl polymer resin production in my country. Taking PVC resin as an example, 38.44% of PVC in my country is produced by using calcium carbide acetylene raw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/58
Inventor 余荪培王盛木
Owner 余荪培
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