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Chromium-contaminated soil repairing agent and preparation method thereof

A technology for chromium-contaminated soil and remediation agent, which is applied in the field of remediation preparations for chromium-contaminated soil

Inactive Publication Date: 2017-05-24
SHANDONG CHUANGXIN HUMIC ACID TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the whole reaction process, the induced draft fan and acid mist purifier are turned on

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: Metering with a metering pump, adding 20kg of clear water and 140kg of biological fulvic acid into the glass-lined reactor, starting the mixer, the rotating speed is 30 rpm, turning on the induced draft fan and the acid mist purifier, turning on the heater, and making the kettle Keep the internal temperature at 20°C; then add 140kg of ferrous sulfate heptahydrate weighed by an electronic scale into the glass-lined reactor, keep the temperature at 20°C, stir for 40 minutes, and mix well. The liquid is filtered by a centrifugal filter to remove insoluble matter, and the filtered reaction liquid is the chromium-contaminated soil remediation agent, which is put into a tank, loaded into a truck, and stored or used directly.

Embodiment 2

[0015] Embodiment 2: Metering with a metering pump, adding 100kg of clear water and 20kg of biological fulvic acid to the stainless steel reaction kettle, starting the mixer, the speed is 25 rpm, turning on the induced draft fan and the acid mist purifier, turning on the heater, and turning on the kettle. Heat the temperature to 55°C; then add 100kg of sodium sulfate weighed by an electronic scale into the stainless steel reactor, keep the temperature at 55°C, stir for 30 minutes, and mix well. Machine filtration to remove insoluble matter, and the filtered reaction solution is the chromium-contaminated soil remediation agent, which is poured into a small-mouth barrel, loaded into a truck, transported out for storage or used directly.

Embodiment 3

[0016] Embodiment 3: Metering with a metering pump, adding 50kg of clear water and 100kg of biological fulvic acid into the glass-lined reactor, starting the mixer at a speed of 40 rpm, turning on the induced draft fan and the acid mist purifier, turning on the heater, and turning the kettle on Heat the internal temperature to 85°C; then add 50kg of ferrous sulfate heptahydrate weighed by an electronic scale into the glass-lined reaction kettle, keep stirring at 85°C for 20 minutes, mix well, and release the liquid in the reaction kettle after the reaction process is over , filtered by a centrifugal filter to remove insoluble matter, and the filtered reaction solution is the chromium-contaminated soil remediation agent, which is poured into a bottle, loaded into a car, transported out for storage or used directly.

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Abstract

Provided is a chromium-contaminated soil repairing agent and a preparation method. The chromium-contaminated soil repairing agent comprises, by mass ratio, 20-100 of clear water, 20-140 of biological fulvic acid and 20-100 of FeSO4 or Na2S. A production line comprises a reaction kettle, a heater, a metering pump, an electronic scale, a hoist, an induced draft fan, an acid mist purifier and a centrifugal filter. A preparation process comprises the steps that metering is conducted through the metering pump, the clear water and the biological fulvic acid are added to the reaction kettle according to the ratio, heating is conducted to 20-85 DEG C through the steam heater, a stirrer is started, the rotation speed is 15-50 r / min, FeSO4 or Na2S is weighed through the electronic scale according to the ratio and added to the reaction kettle through the hoist, the temperature is kept in the range of 20-85 DEG C, stirring is conducted over 20 min, and an uniform mixed solution is formed. By the adoption of the chromium-contaminated soil repairing agent and the preparation method, the chromium-contaminated soil can be repaired effectively, secondary pollution is eliminated, the natural environment is improved, the repair speed is high, the effect is good, the control cost is low, and the application range is wide.

Description

technical field [0001] The invention relates to the purification and treatment of polluted soil, in particular to a restoration preparation and a production method of the restoration preparation for chromium-polluted soil. Background technique [0002] Soil pollution will pose a serious threat to the ecological environment, food safety and human health. In recent years, soil pollution caused by heavy metal pollutants has been particularly prominent, and soil contaminated by chromium is the most important. [0003] Chromium exists mainly in two stable valence states of hexavalent chromium Cr(VI) and trivalent chromium Cr(III) in nature. Trivalent chromium mainly exists in the form of Cr3+, which has low activity and low toxicity; hexavalent chromium mainly exists in two forms of HCrO4- and CrO42-, which are easily soluble in water, have high activity and strong toxicity. At present, the remediation technologies for chromium-contaminated soil mainly include biological remedia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/40
Inventor 孙明广田原宇杜茂福田红燕
Owner SHANDONG CHUANGXIN HUMIC ACID TECH
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