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

Inactive Publication Date: 2020-05-19
广西田东曙光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional wastewater treatment methods are not economical, and the filtered suspended matter is difficult to treat as solid waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a preparation method of a selenium-rich liquid chemical fertilizer. The method comprises the following steps: employing bentonite pickling wastewater containing K <+>, Na <+>,Ca <2+>, Mg <2+>, Fe <3+> and SeO3 <2-> as a raw material, adding caustic soda flakes to neutralize to enable the pH value of the wastewater to reach 6.0-7.0; then feeding the supernatant into a reverse osmosis water treatment device, and concentrating the mixed liquid until K <+> is 10.0-20.0 g / L, CaSO4 is supersaturated, Mg <2+> is 30.0-40.0 g / L, Fe <3+> is 0.3-1.0 g / L and SeO <2-> is 0.1-0.3 g / L; finally, adding ammonium nitrate, potassium nitrate and calcium hypophosphite in proportion, so that the molar ratio of N to P to K in the compound fertilizer is 20:(15-5):(15-5), wherein the concentration of P reaches 10.0-20.0 g / L. The method has the advantages that the process is simple, and the operation is convenient; industrial wastewater is utilized, so that the method is environment-friendly; the prepared compound fertilizer is reasonable in proportion of large and medium elements, and also contains a small amount of trace elements Fe and Se required by plants.

Description

technical field [0001] The invention belongs to the field of chemical fertilizer production, in particular to a method for preparing liquid chemical fertilizer by using bentonite pickling wastewater. Background technique [0002] Activated clay is an odorless, tasteless, non-toxic white or beige powder or granule, which is dispersed and greasy. It is used for decolorization of animal oil, vegetable oil, mineral oil and refining of petroleum products. It is also used as a catalyst for organic synthesis. The current industrial production method is to first dry bentonite until the surface moisture is 8%-20%, then after screening, add it to an activator equipped with hot water to fully swell and pulverize it, and then add a certain amount of concentrated sulfuric acid to activate it for 3-4 hours. h (Mineral Protection and Utilization, 2015, (3): 50-53). In this process, a large amount of pickling wastewater will be produced, which contains a large amount of Ca 2+ , Mg 2+ 、K ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C05G5/20
CPCC05B17/00C05C1/00C05C5/02C05D1/00C05D3/00C05D5/00C05D9/00C05D9/02C05F7/00
Inventor 周佐吴靖李宗峰秦祖赠罗轩
Owner 广西田东曙光科技有限公司
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