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Method for co-producing sodium carbonate and ammonium chloride by utilizing salt-containing wastewater

A technology for saline wastewater and ammonium chloride, applied in the direction of ammonium chloride, ammonium halide, carbonate preparations, etc., to achieve the effect of solving the problem of disposal

Inactive Publication Date: 2017-05-17
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are currently no concrete and feasible solutions for how to convert crystallized salt into non-hazardous waste through pretreatment

Method used

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  • Method for co-producing sodium carbonate and ammonium chloride by utilizing salt-containing wastewater
  • Method for co-producing sodium carbonate and ammonium chloride by utilizing salt-containing wastewater
  • Method for co-producing sodium carbonate and ammonium chloride by utilizing salt-containing wastewater

Examples

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Effect test

Embodiment 1

[0041] This example is used to illustrate the use of figure 2 The method shown is a method for co-producing soda ash and ammonium chloride by using salty wastewater.

[0042] Synthetic saline wastewater was used as raw water to simulate wastewater discharged from coal chemical enterprises, and its water quality parameters are shown in Table 1.

[0043] (1) Set the flow to 10m 3 The above-mentioned synthetic salt-containing wastewater of / h was subjected to reverse osmosis treatment, and the flow rate was 6.6 m 3 Product water and flow rate of 3.4m / h 3 The reverse osmosis concentrated water with a NaCl concentration of 100g / L per hour, and the product water is returned to the production system for recycling. The conditions of the reverse osmosis treatment include: the pressure is 5MPa, the temperature is 30°C, the membrane pore size is 0.5nm, and the membrane material is for cellulose acetate.

[0044] (2) Set the flow to 3.4m 3 / h of reverse osmosis concentrated water is...

Embodiment 2

[0057] This example is used to illustrate the use of image 3 The method shown is a method for co-producing soda ash and ammonium chloride by using salty wastewater.

[0058] (1) Set the flow to 11m 3 The synthetic salt-containing wastewater described in Table 1 of / h is subjected to reverse osmosis treatment, and the obtained flow rate is 7m 3 4m of product water and flow per hour 3 The reverse osmosis concentrated water with a NaCl concentration of 110g / L per hour, and the product water is returned to the production system for recycling. The conditions of the reverse osmosis treatment include: the pressure is 5.2MPa, the temperature is 28°C, the membrane pore size is 0.5nm, and the membrane The material is cellulose acetate.

[0059] (2) Set the flow to 4m 3 / h reverse osmosis concentrated water is treated by nanofiltration, and the flow rate is 1.1m 3 / h of divalent salt-rich brine and flow rate of 2.9m 3 The NaCl concentration of / h is 105g / L of monovalent salt-rich ...

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Abstract

The invention relates to the field of coal chemical industrial wastewater, and discloses a method for co-producing sodium carbonate and ammonium chloride by utilizing salt-containing wastewater. The method comprises: (1) separating the salt-containing wastewater, and removing divalent salt in the salt-containing wastewater to obtain saline water rich in univalent salt; (2) performing carbonization treatment on the saline water rich in the univalent salt to obtain sodium bicarbonate precipitates and carbonized mother liquor; (3) performing calcination treatment on the sodium bicarbonate precipitates obtained in the step (2) to obtain sodium carbonate; (4) performing crystal separation treatment on the carbonized mother liquor obtained in the step (2) to obtain ammonium chloride. The method of the invention not only can effectively solve the problem of disposal of low-additional-value NaCl in the salt-containing wastewater, but also can generate a certain economic benefit, an effective technical means is provided for enterprises such as coal chemical industries to achieve the aim of zero release of the salt-containing wastewater, and the problem of disposal of the low-additional-value NaCl in the salt-containing wastewater and the great carbon emission reduction pressure can be solved.

Description

technical field [0001] The invention relates to the field of coal chemical wastewater treatment, in particular to a method for co-producing soda ash and ammonium chloride by utilizing coal gasification salt-containing wastewater. Background technique [0002] In recent years, due to the dual constraints of water resources and water environment, domestic coal chemical projects have proposed zero-discharge solutions for wastewater. Zero discharge of wastewater is a design scheme based on the rational division of the water system, combined with the characteristics of wastewater, to achieve maximum treatment and reuse, and no longer discharge to natural water bodies in the form of wastewater. According to water quality and quantity, coal chemical wastewater is mainly divided into coal gasification organic wastewater and saline wastewater. Salty wastewater includes biochemically treated wastewater and clean wastewater, and the total dissolved solids (TDS) content is 1-3g / L. The...

Claims

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Application Information

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IPC IPC(8): C01D7/18C01D7/12C01C1/16
CPCC01D7/18C01C1/164C01D7/12C01P2006/80C01P2006/82
Inventor 赵兴雷
Owner CHNA ENERGY INVESTMENT CORP LTD
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