Method for obtaining mineral elements from waste compost by united elution by ammonium sulfate and citric acid
A technology of mineral elements and garbage composting, which is applied in safe use and reasonable fields of garbage composting
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Embodiment 1
[0022] 1) Compost domestic waste containing mineral elements, sieve and sort, air-dry naturally, grind, sieve, and set aside;
[0023] 2) The fine sand was treated with 1% H 2 SO 4 After cleaning, dry at 100°C for 24 hours to filter the bottom layer;
[0024] 3) Put the treated fine sand and garbage compost into the rinse device, rinse with ammonium sulfate and citric acid mixture, after the rinse is completed, leave the rinse solution for 48 hours; wherein the compost and the mixture The ratio of parts by weight is 1:10; 20mmol / kg citric acid: 1g / L (NH 4 ) 2 SO 4 =1:2.5.
[0025] 4) Rinse the compost with water again, collect the eluent, let it stand until there is no more eluent dripping out after rinsing, leave it for 24 hours, then rinse it for the second time, or for the third time, and collect the eluate ;
[0026] 5) Combine the eluents collected in 3) and 4), put 50ml in a small beaker, add 5ml of concentrated nitric acid, heat, and when 10-15ml of the solution ...
Embodiment 2
[0028] Embodiment 2 (more detailed experimental process is as follows)
[0029] Experimental Materials
[0030]The compost from Xiaodian Garbage Composting Treatment Plant is sieved first to ensure that large objects such as bricks in the compost are sifted out; then the compost is stirred evenly with a pestle to keep the compost density basically consistent everywhere; the compost is dried in an oven, Turn the compost every 20 minutes during the drying process to make the compost dry as soon as possible. Wash the sand with tap water three times first, remove the sand with larger particles in the first wash, then soak it in 5% nitric acid for a period of time, and stir it several times with a glass rod, so that the nitric acid can fully contact with the sand and remove the interference in the sand ions; finally washed three times with distilled water. Put the washed sand into the oven to dry.
[0031] Cut the PVC pipe into a short pipe with a length of 25cm, take a piece of...
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