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Method for preparing compound fertilizer from salt manufacturing mother liquor

A compound fertilizer and mother liquor technology, applied in chemical instruments and methods, phosphorus compounds, fertilization devices, etc., can solve the problems of complex process route, high energy consumption, difficult to popularize and apply, etc., and achieve cost reduction, simple process and energy saving. Effect

Inactive Publication Date: 2013-11-06
TIANJIN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lengthy process of producing potassium chloride by the bittern method, high energy consumption, low product added value and low extraction rate, the total utilization rate of potassium chloride in the salt mother liquor (bitrine) is less than 70%.
Patent 02135647.5 proposes a process route similar to this patent, and proposes a new route for the comprehensive utilization of salt-making mother liquor (bitrine), but the process route of this patent is complicated, and KCl and other raw materials need to be added
It is difficult to popularize and apply for our country with poor potassium resources
Before the present invention, still do not use salt making mother liquor (bitter bittern), the processing route of directly producing compound fertilizer

Method used

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  • Method for preparing compound fertilizer from salt manufacturing mother liquor
  • Method for preparing compound fertilizer from salt manufacturing mother liquor
  • Method for preparing compound fertilizer from salt manufacturing mother liquor

Examples

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Effect test

Embodiment 1

[0034] This example is an example of using the technology of the present invention to produce nitrogen, potassium, magnesium, and sulfur quaternary compound fertilizers using the salt-making mother liquor (bitrine) and ammonia gas after seawater salt making is a kind of patented technology. actual technical process.

[0035] This process mainly goes through several key steps: reaction-separation, evaporation-separation, evaporation-cooling-separation, mother liquor circulation.

[0036] The first step: reaction crystallization-solid-liquid separation process. This step reaction is based on NH 3 The basic principle is that the aqueous solution is alkaline, and magnesium ions can form intolerant magnesium hydroxide with hydroxide. By introducing ammonia into the bittern, hydroxide and ammonium ions are formed, and then magnesium hydroxide is formed with magnesium ions in the bittern. Introduce nitrogen, the active ingredient of compound fertilizer, into the system. The reactio...

Embodiment 2

[0044] This example is an example of using the technology of the present invention to produce nitrogen, phosphorus, potassium, magnesium, and sulfur five-element compound fertilizer by using the salt-making mother liquor (bitrine), ammonia and phosphoric acid after seawater salt-making as raw materials. An actual technical process of technology. The main process is several key steps: ammonia reaction crystallization-separation, phosphoric acid reaction crystallization-separation, evaporation-separation, secondary evaporation-cooling-separation.

[0045] The first step: ammoniation reaction crystallization process - solid-liquid separation. The main purpose of this step reaction is to introduce nitrogen, an effective component of compound fertilizer, into the system. The reaction is carried out at normal temperature, and the main control index is that the recovery rate of magnesium is 75-80%. After solid-liquid separation, a mother liquor with ammonium ions is obtained, and t...

Embodiment 3

[0051] This example is an example of using this patented technology to produce nitrogen, phosphorus, potassium, magnesium and sulfur five-element compound fertilizer with bittern, ammonia and phosphoric acid after salt production from seawater as raw materials. There is a mother liquor recovery process in the process, which is a practical technical process of this patented technology.

[0052] This process mainly goes through several key steps: ammonia addition reaction crystallization-separation, phosphoric acid addition reaction crystallization-separation, evaporation-separation, evaporation-cooling-separation, mother liquor circulation.

[0053] The first step: the mother liquor in the production process is mixed with the raw material brine. Using mother liquor circulation, all the chemical components in the brine can be precipitated in the form of products.

[0054] The second step: ammoniation reaction crystallization process - solid-liquid separation. The main purpose ...

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Abstract

The invention discloses a method for preparing a compound fertilizer of nitrogen, phosphorus, potassium, sulfur and magnesium from a salt manufacturing mother liquor (bittern), ammonia gas and acids (phosphoric acid, sulfuric acid and hydrochloric acid) serving as raw materials. A technology of the invention is technically characterized in that: a seawater salt manufacturing mother liquor is taken as a basic raw material, chemical resources in seawater are fully utilized, foreign ions are removed by introducing nitrogen and phosphorus serving as active ingredients in the compound fertilizer respectively in a process through the variation of the solubility of different matters, and the compound fertilizer is produced by combining potassium in the seawater; and the technology is a specific comprehensive seawater utilization technology. In a process, the compound fertilizer of nitrogen, phosphorus, potassium, sulfur and magnesium is prepared by performing reaction crystallization at different stages, step-by-step evaporation and solid-liquid separation at different stages, and high-level magnesium hydroxide is produced. The process flow is simple, environmental pollution is eliminated, waste is changed into valuable, and chemical fertilizers needed by agricultural production are provided; and in the process, Mg<2+>, K<+>, Cl<-> and SO4<2-> in the salt manufacturing mother liquor are extracted fully, so that energy is saved, cost is lowered, and a wide application prospect is achieved.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry. The salt-making mother liquor (bitrine), ammonia gas, acid (phosphoric acid, hydrochloric acid, sulfuric acid, etc.) bittern) to separate and extract active components such as potassium, sulfur, and chlorine in the salt mother liquor (bitrine), and prepare agricultural nitrogen, phosphorus, potassium, magnesium, sulfur compound fertilizers and by-products magnesium hydroxide and sodium chloride . It is a new process for the comprehensive utilization of salt-making mother liquor (bitrine) and the preparation of compound fertilizer, which can be used for the treatment of salt-making mother liquor. Background technique [0002] my country's current salt production capacity using seawater as the basic raw material exceeds 40 million tons. For every ton of salt produced, about one ton of salt-making mother liquor (bitrine) will be discharged. The salt-making mother liquor (bitrine) contains...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00C01B25/45C01D3/04C01F5/20
Inventor 沙作良李祯祥王学魁袁建军丁吉生任杰刘立平王彦飞朱亮
Owner TIANJIN UNIV OF SCI & TECH
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