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Method for comprehensively utilizing waste liquid generated in process of preparing alkali by ammonia-alkali method

A technology of alkali-making waste liquor and ammonia-alkali method, applied in chemical instruments and methods, earthwork drilling, calcium/strontium/barium compounds, etc., can solve the problem of wasting resources, unable to be turned into products, and insufficient total utilization rate of sodium chloride 70% and other problems to achieve the effect of solving pipeline transportation and well injection and reducing calcium sulfate accumulation

Active Publication Date: 2021-05-28
JIANGXI JINGHAO SALINIZATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The advantages of the traditional ammonia-soda method are low investment, high product purity, and good investment returns, but its shortcomings are also very obvious: one is that a large amount of waste liquid alkali slag discharged has a huge impact on the environment; the other is the total amount of sodium chloride The utilization rate is less than 70%, which not only wastes resources but also affects the environment
However, the salt gypsum by-produced underground cannot be turned into a product due to technical reasons, resulting in a large waste of resources

Method used

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  • Method for comprehensively utilizing waste liquid generated in process of preparing alkali by ammonia-alkali method

Examples

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Embodiment 1

[0038] This embodiment provides a method for comprehensive utilization of waste liquor from ammonia-soda production, comprising the following steps:

[0039] 1) Aeration process: Introduce air into the ammonia-soda process alkali-making waste liquid at a temperature of 83°C to aerate and remove ammonia, collect ammonia gas with water to obtain an ammonia solution, and return the ammonia solution to the soda-making section for use;

[0040] 2) Settling process: naturally settle the aeration-treated soda-making waste liquid to obtain supernatant and bottom thick slurry, and the supernatant flows out naturally by overflowing to obtain bottom thick slurry with a solid content of 35%. The thick slurry is wet-milled with a horizontal ball mill to obtain a grinding slurry. Zirconium silicate balls with a diameter of 6 mm are used as the grinding medium, and the material-to-ball ratio is 1:2.5. The D50 of the grinding slurry is 1 μm.

[0041] 3) pulping process: add 3% hydrogen peroxi...

Embodiment 2

[0047] This embodiment provides a method for comprehensive utilization of ammonia-soda alkali-making waste liquid uphole and downhole circulation, including the following steps:

[0048] 1) Aeration process: Introduce air into the ammonia-soda process alkali-making waste liquid at a temperature of 83°C to aerate and remove ammonia, collect ammonia gas with water to obtain an ammonia solution, and return the ammonia solution to the soda-making section for use;

[0049] 2) Settling process: naturally settle the aeration-treated soda-making waste liquid to obtain a supernatant and a bottom thick slurry, and the supernatant flows out naturally by overflowing to obtain a bottom thick slurry with a solid content of 30%. The thick slurry is wet-milled with a horizontal ball mill to obtain a grinding slurry. Zirconium silicate balls with a diameter of 8 mm are used as the grinding medium, and the material-to-ball ratio is 1:3. The D50 of the grinding slurry is 1.5 μm.

[0050] 3) pulp...

Embodiment 3

[0056] This embodiment provides a method for comprehensive utilization of ammonia-soda alkali-making waste liquid uphole and downhole circulation, including the following steps:

[0057] 1) Aeration process: Introduce air into the ammonia-soda process soda-making waste liquid at a temperature of 87°C to aerate and remove ammonia, collect ammonia gas with water to obtain an ammonia solution, and return the ammonia solution to the soda-making section for use;

[0058] 2) Grinding process: naturally settle the aerated soda-making waste liquid to obtain a supernatant and a bottom thick slurry, and the supernatant flows out naturally by overflowing to obtain a bottom thick slurry with a solid content of 40%. The thick slurry is wet-milled with a horizontal ball mill to obtain a grinding slurry. Zirconium silicate balls with a diameter of 8 mm are used as the milling medium. The material-to-ball ratio is 1:2.5, and the D50 of the grinding slurry is 1.2 μm.

[0059] 3) pulping proces...

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Abstract

The invention belongs to the technical field of mineral development, and particularly relates to a method for cyclically and comprehensively utilizing waste liquid generated in the process of preparing an alkali by an ammonia-alkali method. The method for comprehensively utilizing the waste liquid generated in the process of preparing the alkali by the ammonia-alkali method comprises the following steps: naturally settling the pretreated alkali-making waste liquid, and separating to obtain a light calcium liquid; mixing the light calcium liquid with a salt-making discharged mother liquor, and reacting to generate mixed slurry of calcium sulfate dihydrate and sodium chloride; pumping the mixed slurry into a settling tank by using a slurry pump, and thickening the solid content of the slurry to obtain thick slurry; and carrying out solid-liquid separation on the thick slurry to obtain afiltrate II and filter residues II, and washing the filter residues II with water to obtain gypsum, wherein the filtrate II is a high-concentration NaCl solution, and is injected into a mine well to be extracted. By means of the method, the situation that calcium sulfate generated underground deposits and covers mineral resources at the bottom of the well can be reduced, calcium sulfate and calcium carbonate products can be obtained in the circulation process, and mineral resources are more fully utilized.

Description

technical field [0001] The invention belongs to the technical field of mineral development, and in particular relates to a method for comprehensive utilization of waste liquor from ammonia-soda production. Background technique [0002] The advantages of the traditional ammonia-soda method are low investment, high product purity, and good investment returns, but its shortcomings are also very obvious: one is that a large amount of waste liquid alkali slag discharged has a huge impact on the environment; the other is that the total amount of sodium chloride The utilization rate is less than 70%, which not only wastes resources but also affects the environment. In order to solve the shortcomings of the traditional ammonia-soda method, Jiangsu Jingshen Salt Chemical Co., Ltd. used its own sodium sulfate rock salt deposit and the mined rock salt solution cavity to propose the fourth soda production method of "underground circulation soda production process". That is, "salt, alka...

Claims

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Application Information

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IPC IPC(8): C01F11/46E21B43/28
CPCC01F11/46C01F11/468E21B43/28
Inventor 邓强李春林林应南孙七林宋信信
Owner JIANGXI JINGHAO SALINIZATION
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