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Method for separating and recycling ammonia sulfate from preparation technology of sodium sulfide adopting solid waste sodium sulfate

A technology of separation and recovery of sodium sulfate, applied in the direction of alkali metal sulfide/polysulfide, ammonium sulfate, etc., can solve the problems of industrial pollution, waste of air, etc., and achieve the goal of increasing output, avoiding waste, and preventing pollution Effect

Inactive Publication Date: 2017-02-22
攀枝花市博信化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the pulverized coal reduction process, harmful gases such as ammonia, sulfur dioxide, and chlorine will be produced, and harmful dust of sodium sulfide will also be produced. Directly discharging these harmful substances into the air will not only waste but also cause industrial pollution of the air.

Method used

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  • Method for separating and recycling ammonia sulfate from preparation technology of sodium sulfide adopting solid waste sodium sulfate
  • Method for separating and recycling ammonia sulfate from preparation technology of sodium sulfide adopting solid waste sodium sulfate

Examples

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Embodiment 1

[0025] A method for separating and recovering ammonium sulfate in a process for preparing sodium sulfide by using solid waste sodium sulfate, the specific steps are as follows:

[0026] Step 1: Drying: Place the solid waste sodium sulfate in a drying heating device for drying treatment. In the process of producing sodium sulfide based on solid waste sodium sulfate, dry solid waste sodium sulfate can make the process better, so it is necessary to dry the solid waste sodium sulfate, but at the same time, the drying process will also generate a lot of harmful gases and The main components of dust and solid waste sodium sulfate are as follows:

[0027]

[0028]

[0029] The reaction formula of the main reaction is as follows:

[0030] (NH 4 ) 2 SO 4 →NH 3 ↑+SO 2 ↑

[0031] 2NH 4 Cl→NH 3 ↑+Cl 2 ↑

[0032] SO 2 +H 2 O→H 2 SO 3

[0033] NH 3 +H 2 O→NH 3 ·H 2 O

[0034] Cl 2 +H 2 O→HClO+HCl

[0035] 2NH 3 ·H2O+H 2 SO 4 =(NH 4 ) 2 SO 4 +2H 2 O

[0036] From the above reaction formula, it can be kn...

Embodiment 2

[0053] Compared with Example 1, in Step 2, the spray liquid is the alkaline waste liquid produced by the pulverized coal reduction process. The alkaline waste liquid can neutralize the hydrochloric acid dissolved in water to prevent the two harmful solutions from being discharged into the water area. surroundings.

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Abstract

The invention discloses a method for separating and recycling ammonia sulfate from a preparation technology of sodium sulfide adopting solid waste sodium sulfate. The method comprises the following specific steps: drying: drying solid waste sodium sulfate; dust removal and spraying: performing dust removal and spraying of the generated waste gas; crystallization: crystallizing the solution obtained by spraying; and separation: separating ammonia sulfate from the crystal by a separation device. In the invention, main harmful components, namely ammonia, sulfur dioxide and chlorine, in the waste gas can be filtered out while industrial ammonia sulfate is generated, so that environmental pollution is prevented, and useful chemical raw materials are prepared.

Description

Technical field [0001] The invention relates to the field of metallurgical waste recovery, in particular to a method for separating and recovering ammonium sulfate in a process for preparing sodium sulfide from solid waste sodium sulfate. Background technique [0002] At present, most of the metallurgical extraction of vanadium at home and abroad adopts the "sodium roasting-water leaching-ammonium salt vanadium precipitation" process. The vanadium oxide precipitation process produces vanadium precipitation wastewater. The "reduction neutralization-evaporation concentration" treatment process is mostly used. Crystalline sludge has the characteristics of chemical solid waste such as complex species, large production volume, and great resource utilization potential. Concentrated sludge contains a large amount of sodium sulfate, which will have a greater impact on the environment. Therefore, industrial recovery of solid waste sodium sulfate is of great significance. The main compon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/24C01B17/26
CPCC01B17/26C01C1/24
Inventor 赵成刚
Owner 攀枝花市博信化工有限责任公司