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Method for preparing chemical fertilizer from salt-making mother liquor (bittern)

A chemical fertilizer and mother liquor technology, applied in fertilizer mixtures, fertilization devices, agriculture, etc., can solve the problems of large demand for chemical fertilizers and insufficient utilization of salt mother liquor, and achieve energy saving and cost reduction effects

Inactive Publication Date: 2006-01-25
东营市广饶县盐化工业集团总公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose the present invention containing Mg for the present situation that the current salt mother liquor is not fully utilized and the demand for chemical fertilizers is large. 2+ 、K + and SO 4 2- The process plan for producing fertilizers such as magnesium ammonium phosphate, potassium sulfate and ammonium chloride from the salt-making mother liquor as the main products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mg 2+ 63.0g / L, K + 8.1g / L, Na + 32.1g / L, SO 4 2- 55.0g / L, Cl - 10L of 202.5g / L salt-making mother liquor (bitter bittern), according to the Mg contained in the raw material liquor 2+ The amount of ammonium magnesium phosphate (NH 4 MGPO 4 ) ratio, equivalent (in P 2 o 5 3.76 L of wet-process phosphoric acid with a concentration of 48.9% was added. Then at room temperature, feed ammonia gas while constantly stirring, stop feeding ammonia when the pH value of the system reaches 7, then clarify, filter, wash, and dry to obtain 6.31Kg of magnesium ammonium phosphate hexahydrate, and the precipitation rate of magnesium is 99.45 %.

[0021] According to K contained in magnesium ammonium phosphate mother liquor + and SO 4 2- The number of K 3 Na(SO 4 ) 2 Add 96% potassium chloride to the magnesium ammonium phosphate mother liquor, then feed ammonia gas at room temperature while stirring continuously, and stop the ammonia feeding when the free ammonia content of...

Embodiment 2

[0024] Mg 2+ 63.0g / L, K + 8.1g / L, Na + 32.1g / L, SO 4 2- 55.0g / L, Cl - 10L of 202.5g / L salt-making mother liquor (bitter bittern), according to the Mg contained in the raw material liquor 2+ The amount of ammonium magnesium phosphate (NH 4 MGPO 4 ) chemical composition ratio, equivalent (in P 2 o 5 3.12 L of wet-process phosphoric acid with a concentration of 58.9% was added. Then feed ammonia gas at 340±3°K or above while stirring continuously, stop passing ammonia when the pH value of the system reaches 7.5, and then clarify, filter, wash, and dry to obtain 4.0Kg of magnesium ammonium phosphate monohydrate, magnesium The precipitation rate is 99.8%.

[0025] According to K contained in magnesium ammonium phosphate mother liquor + and SO 4 2- The number of K 3 Na(SO 4 ) 2 Add 96% potassium chloride to the magnesium ammonium phosphate mother liquor, then feed ammonia gas at room temperature while constantly stirring, stop feeding ammonia when the free ammonia co...

Embodiment 3

[0028] Mg 2+ 63.0g / L, K + 8.1g / L, Na + 32.1g / L, SO 4 2- 55.0g / L, Cl - 10L of 202.5g / L salt-making mother liquor (bitter bittern), according to the Mg contained in the raw material liquor 2+ The amount of ammonium magnesium phosphate (NH4 MGPO 4 ) stoichiometric ratio, equivalent (in P 2 o 5 meter) to add the ammonium salt of phosphoric acid. Then at room temperature, while constantly stirring, slowly feed ammonia gas, stop passing ammonia when the pH value of the system reaches 7, then clarify, filter, wash, and dry to obtain 6.31Kg of ammonium magnesium phosphate hexahydrate, the precipitation rate of magnesium is 99.67%.

[0029] According to K contained in magnesium ammonium phosphate mother liquor + and SO 4 2- The number of K 3 N a (SO 4 ) 2 Add 96% potassium chloride to the magnesium ammonium phosphate mother liquor, then feed ammonia gas at room temperature while stirring continuously, and stop the ammonia feeding when the free ammonia content of the sys...

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Abstract

A process for preparing chemical fertilizer from the bitter halogen or saline features that the magnesium ammonium phosphate, potassium sulfate and ammonium (or calcium) chloride are deposited and separated step by step according to their solubilities. Its advantages are high extracting rate up to more than 98% for Mg2+, K+ and SO42-, and low cost.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry, in detail is to utilize the 2+ 、K + , SO 4 2- A new process for the comprehensive utilization of chemical fertilizers such as magnesium ammonium phosphate, potassium sulfate and ammonium chloride extracted from the salt-making mother liquor. Background technique [0002] my country's raw salt production ranks among the top in the world, with an annual output of more than 20 million tons, and nearly 20 million tons of salt-making mother liquor (bitrine), which contains Mg 2+ 50~70g / L, including K + 10~15g / L, including SO 4 2- 60~80g / L. Since the end of the 1950s, my country began to research and develop the utilization of salt-making mother liquor, and basically formed the KCl, Br 2 and halogen blocks (MgCl 2 ·6H 2 O) is the production process of adding brine method for the product. However, due to the backward technology of the bittern blending method, high energy consumption...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00C05D11/00
Inventor 刘亦凡李延丰王升吉董殿权侯晓红张其中刘晓玲刘文涛李明华
Owner 东营市广饶县盐化工业集团总公司
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