Preparation method of selenium-rich liquid fertilizer
A chemical fertilizer and liquid technology, applied in the direction of liquid fertilizer, nitrogen fertilizer, potash fertilizer, etc., can solve the problems of no economic benefits, difficult to handle, etc., achieve the effect of reasonable proportion, save emission cost, and increase product income
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Embodiment 1
[0019] A preparation method of a liquid chemical fertilizer, comprising the steps of: + 、Na + , Ca 2+ , Mg 2+ , Fe 3+ , SeO 3 2- The bentonite pickling wastewater is used as raw material, firstly add caustic soda to neutralize the pH value of the wastewater to 6.0; then pass the supernatant into the reverse osmosis water treatment device and concentrate to K + 10.0 g / L, CaSO 4 Supersaturated, Mg 2+ 30.0 g / L, Fe 3+ 0.3 g / L, SeO 3 2- 0.1 g / L; finally, ammonium nitrate, potassium nitrate, and calcium hypophosphite were added in proportion, so that the molar ratio of N:P:K in the compound fertilizer was 20:15:5, and the concentration of P reached 10.0 g / L.
Embodiment 2
[0021] A preparation method of a liquid chemical fertilizer, comprising the steps of: + 、Na + , Ca 2+ , Mg 2+ , Fe 3+ , SeO 3 2- The bentonite pickling wastewater is used as raw material, firstly add caustic soda to neutralize the pH value of the wastewater to 6.5; then pass the supernatant into the reverse osmosis water treatment device and concentrate to K + 15.0 g / L, CaSO 4 Supersaturated, Mg 2+ 35 g / L, Fe 3+ 0.7 g / L, SeO 3 2- 0.2 g / L; finally add ammonium nitrate, potassium nitrate, and calcium hypophosphite in proportion, so that the molar ratio of N:P:K in the compound fertilizer is 20:5:10, and the concentration of P reaches 15 g / L.
Embodiment 3
[0023] A preparation method of a liquid chemical fertilizer, comprising the steps of: + 、Na + , Ca 2+ , Mg 2+ , Fe 3+ , SeO 3 2- The bentonite pickling wastewater is used as raw material, firstly add caustic soda to neutralize the pH value of the wastewater to 7.0; then pass the supernatant into the reverse osmosis water treatment device and concentrate to K + 20.0 g / L, CaSO 4 Supersaturated, Mg 2+ 40 g / L, Fe 3+ 1.0 g / L, SeO 3 2- Finally, add ammonium nitrate, potassium nitrate, and calcium hypophosphite in proportion, so that the molar ratio of N:P:K in the compound fertilizer is 20:10:15, and the concentration of P reaches 20 g / L.
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