CN101100302B - Method for preparing ammonium carbonate solution from recovered ammonia - Google Patents

Abstract

This invention discloses a method for recovering ammonia water and preparing ammonium carbonate. The ammonium carbonate-containing waste water produced during production of manganese carbonate is added with alkali to regulate its pH value to 11-14. After one hr. reaction, it is filtered, and then the upper clear liquid containing mainly ammonia water is blowed and desorbing its ammonia content. Solution containing 3-20% of ammonium bicarbonate is sprayed-down for recovering ammonia and producing ammonium carbonate with its concentration of 3.5-25%. This inventive method is of low cost treatment, can produce remarkable economic benefit. The produced ammonium carbonate solution is then reused in the production of manganese carbonate as raw material, achieving reutilization of materials, reducing pollution to environment.

Description

A kind of method for preparing sal volatile with recovery ammoniacal liquor

Technical field

The present invention relates to a kind of method for preparing sal volatile, particularly a kind of method for preparing sal volatile with recovery ammoniacal liquor.

Background technology

When producing manganous carbonate, there is a large amount of waste water to produce.The main component of this waste water is an ammonium sulfate, and our company becomes the ammonium sulfate fertilizer product with its high temperature concentration all the time, but economic benefit is low, and waste gas and waste water are more in producing, and the direct discharging of part waste water has caused certain environmental pollution.

Summary of the invention

Purpose of the present invention just provides and a kind ofly prepares the method for sal volatile with recovery ammoniacal liquor, and it can become the ammonium sulfate wastewater treatment raw materials for production of manganous carbonate, and this method processing cost is low, can produce remarkable economic efficiency.Both realize the recycle of material, stopped environmental pollution again.

The object of the present invention is achieved like this: a kind ofly prepare the method for sal volatile with recovery ammoniacal liquor, it may further comprise the steps:

A, the ammonium sulfate waste water that will produce in the time of will producing manganous carbonate add adjusting PH with base to 11-14, react 1 hour after-filtration, get supernatant liquor, and the major ingredient of supernatant liquor is a weak ammonia;

B, with supernatant liquor through stripping desorb ammonia wherein, in the absorption tower, spray absorption ammonia from top to bottom with the 3%-20% ammonium bicarbonate soln, be prepared into the sal volatile of 3.5%-25%.

Adopt method of the present invention, processing cost is low, can produce remarkable economic efficiency.The sal volatile of preparation can be used as the raw material in the manganous carbonate production again, has so both realized the recycle of material, has stopped environmental pollution again.

Description of drawings

The present invention will be further described below in conjunction with drawings and Examples.

Fig. 1 is a process flow diagram of the present invention.

Fig. 1 double as Figure of abstract.

Embodiment

As shown in Figure 1, a kind ofly prepare the method for sal volatile with recovery ammoniacal liquor, it may further comprise the steps:

A, the ammonium sulfate waste water that will produce in the time of will producing manganous carbonate add adjusting PH with base to 11-14, react 1 hour after-filtration, get supernatant liquor, and the major ingredient of supernatant liquor is a weak ammonia;

B, with supernatant liquor through stripping desorb ammonia wherein, in the absorption tower, spray absorption ammonia from top to bottom with the 3%-20% ammonium bicarbonate soln, be prepared into the sal volatile of 3.5%-25%.

Embodiment 1: the ammonium sulfate waste water that will produce in the time of will producing manganous carbonate, add adjusting PH with base to 11-14, and react 1 hour after-filtration, get supernatant liquor.Clear liquid from top to bottom sprays absorption ammonia with 3% ammonium bicarbonate soln through stripping desorb ammonia wherein in the absorption tower, be prepared into 3.6% sal volatile.

Embodiment 2: the ammonium sulfate waste water that will produce in the time of will producing manganous carbonate, add adjusting PH with base to 11-14, and react 1 hour after-filtration, get supernatant liquor.Clear liquid from top to bottom sprays absorption ammonia with ammonium bicarbonate soln through stripping desorb ammonia wherein in the absorption tower, prepare 24% sal volatile.

Claims (1)

1. one kind prepares the method for sal volatile with recovery ammoniacal liquor, it is characterized in that it may further comprise the steps:

A, the ammonium sulfate waste water that will produce in the time of will producing manganous carbonate add adjusting PH with base to 11-14, react 1 hour after-filtration, get supernatant liquor, and the major ingredient of supernatant liquor is a weak ammonia;

B, with supernatant liquor through stripping desorb ammonia wherein, in the absorption tower, spray absorption ammonia from top to bottom with the 3%-20% ammonium bicarbonate soln, be prepared into the sal volatile of 3.5%-25%.

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