Method for removing heavy metals Pb and Cd in oil crop meals by using organic acid salt

A technology of organic acid salts and oil crops, applied in the restoration of polluted soil, etc., can solve the problems of unreported removal of heavy metals in meal cakes, and achieve the effects of easy industrial production, low secondary pollution, and simple treatment process

Active Publication Date: 2014-07-30
HUNAN AGRICULTURAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Method used

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Examples

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Example Embodiment

[0016] Example 1: Weigh 0.9732g of potassium citrate in 70% ethanol (or methanol) solution, shake well to dissolve and dilute to 100ml of ethanol (or methanol) extract of 30mmol / L of potassium citrate, take 3g of oil Rapeseed meal cake is placed in a clean Erlenmeyer flask or centrifuge bottle, and 30ml of potassium citrate ethanol extract is added, and then placed in a constant temperature shaker to shake or roll in a rolling machine for 24 hours, repeat 3 times to reduce or reduce the meal The heavy metals in the cake are filtered or centrifuged and dried to obtain a rapeseed cake with heavy metals Pb and Cd removed. It was determined that the three removal rates of Pb in rapeseed meal were 24.79%, 50.33% and 61.73%; the three removal rates of Cd were 60.79%, 70.69% and 84.57%, respectively.

Example Embodiment

[0017] Example 2: Weigh 0.4700g potassium tartrate in a 70% ethanol (or methanol) solution, shake well to dissolve and dilute to 100ml of 20mmol / L ethanol (or methanol) extract of potassium tartrate, take 3g of oil Rapeseed meal cake is placed in a clean Erlenmeyer flask or centrifuge bottle, add 30ml of potassium tartrate ethanol (or methanol) extract, and then placed in a constant temperature shaker to shake or roll in a rolling machine for 24 hours, repeat 3 times to achieve the reduction Or reduce the heavy metals in the cake, then filter or centrifuge and dry to obtain the cake with heavy metals Pb and Cd removed. It was determined that the three removal rates of Pb in rapeseed meal were 35.28%, 51.67% and 76.38%, respectively; the three removal rates of Cd were 85.49%, 90.25% and 94.67%.

Example Embodiment

[0018] Example 3: Weigh 0.6488g of potassium citrate in a 70% ethanol solution, shake well to dissolve and dilute to 100ml of ethanol extract of 20mmol / L of potassium citrate, take 3g of rapeseed cake in a clean cone Add 30ml of potassium citrate ethanol extract to the bottle or centrifuge bottle, then place it in a constant temperature shaker to shake or roll in a rolling machine for 24 hours, repeat 3 times to reduce or reduce the heavy metals in the cake, then filter or After centrifugal dehydration and drying, a rapeseed cake with heavy metals Pb and Cd removed is obtained. It was determined that the three removal rates of Pb in rapeseed meal were 19.97%, 45.54% and 56.75%; the three removal rates of Cd were 57.37%, 64.38% and 72.30%.

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PUM

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Abstract

The invention discloses a method for removing heavy metals Pb and Cd in oil crop meals by using organic acid salt. The content of the heavy metals Pb and Cd in the meals can be effectively reduced by using the method for treatment. The method comprises the following steps: with the meals obtained after extracting oil from oil crops as raw materials and the organic acid salt as an extraction agent, dissolving in ethyl alcohol (or methyl alcohol) so as to prepare leach liquor, and removing the heavy metals in the meals by adopting an extraction method so as to reduce the damage of the heavy metals Pb and Cd to human bodies and animals. The meals subjected to final treatment have very small side effects on the human bodies and the animals. The method is simple in a treatment technology and low in cost, facilitates industrial production and has important social and economic significance; the possibility of secondary pollution to environments is small by adopting the method.

Description

technical field [0001] The invention relates to a method for removing heavy metals Pb and Cd in oil crop cakes by using organic acid salts. Background technique [0002] Oil crops are an important source of edible vegetable oil, vegetable protein and protein feed in my country, and the production of oil crops plays an important role in national economic and social development. For a long time, my country has always maintained its position as a major country in the world in terms of oil production. The annual output of major oil crops is second only to the United States, ranking second in the world. my country's oil crops mainly include rapeseed, peanut, sesame, castor and sunflower. [0003] According to the latest survey, the overall situation of the soil environment in the country is not optimistic. Some areas have serious soil pollution, the soil environment quality of cultivated land is worrying, and the soil environment problems of industrial and mining wasteland are p...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 曾清如杨洋黎红亮葛一陈
Owner HUNAN AGRICULTURAL UNIV
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