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Method for producing soda ash and co-producing gypsum and basic magnesium carbonate by using mirabilite and dolomite

A technology of dolomite and magnesium carbonate, applied in the direction of magnesium carbonate, alkali metal carbonate, chemical instruments and methods, etc., can solve the problems of low raw material utilization rate, high production cost, and waste discharge, and achieve high cost performance and production The effect of short cycle time and large output

Active Publication Date: 2018-03-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies and current situation of the used soda production method in the existing industry, the purpose of the present invention is to propose a new soda production technology——utilize Glauber's salt and dolomite to produce soda ash and co-produce gypsum and basic magnesium carbonate. Overcome the problems of high energy consumption, high waste discharge in the production process, high production cost, and low utilization rate of raw materials in the existing soda production technology, and at the same time efficiently utilize calcium and magnesium resources in dolomite

Method used

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  • Method for producing soda ash and co-producing gypsum and basic magnesium carbonate by using mirabilite and dolomite
  • Method for producing soda ash and co-producing gypsum and basic magnesium carbonate by using mirabilite and dolomite

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Embodiment 1

[0047] The process and principle of this embodiment are as attached figure 1 with 2 Shown. The electrolytic cell is divided into two areas, an anode area and a cathode area, by a cation exchange membrane 2 that only allows cations to pass through but can prevent anions from passing through. Add 40ml of NaAc solution with a concentration of 3.2mol / L in the anode zone as the anolyte, and add 120ml of saturated NaHCO with a concentration of 1.14mol / L in the cathode zone 3 The solution is used as the electrolyte and at the same time as the reaction material, and 400mA direct current is applied. A gas diffusion electrode is used as the anode electrode 1, and a metal nickel electrode is used as the cathode electrode 3. Use a syringe syringe to draw 0.5ml of anolyte every 10-20min to determine the hydrogen ion concentration. When the hydrogen ion concentration in the solution is higher than 3.168mol / L, take out the catholyte and anolyte separately. At this time, the anolyte is HAc so...

Embodiment 2

[0052] The process of this embodiment is as attached figure 1 with 2 Shown. The electrolytic cell is divided into two areas, an anode area and a cathode area, by a cation exchange membrane 2 that only allows cations to pass through but can prevent anions from passing through. Add 40ml of NaAc solution with a concentration of 1.6mol / L in the anode zone as the anolyte, and add 60ml of saturated NaHCO with a concentration of 1.14mol / L in the cathode zone 3 The solution is used as the electrolyte and at the same time as the reaction material, and 400mA direct current is applied. A gas diffusion electrode is used as the anode electrode 1, and a metal nickel electrode is used as the cathode electrode 3. Use a syringe syringe to draw 0.5ml of anolyte every 10 to 20 minutes to determine the hydrogen ion concentration. When the hydrogen ion concentration in the solution is higher than 1.52mol / L, take out the cathode and anolyte respectively. At this time, the anolyte has a concentration...

Embodiment 3

[0057] The process of this embodiment is as attached figure 1 with 2 Shown. The electrolytic cell is divided into two areas, an anode area and a cathode area, by a cation exchange membrane 2 that only allows cations to pass through but can prevent anions from passing through. Add 40ml of NaCl solution with a concentration of 3.2mol / L in the anode zone as the anolyte, and add 120ml of saturated NaHCO with a concentration of 1.14mol / L in the cathode zone 3 The solution is used as the electrolyte at the same time as the reaction raw material, after loading 400mA direct current. A gas diffusion electrode is used as the anode electrode 1, and a metal nickel electrode is used as the cathode electrode 3. Use a needle syringe to draw 0.5ml of anolyte every 10-20 minutes to determine the hydrogen ion concentration. When the hydrogen ion concentration in the solution is higher than 3.168mol / L, take out the cathode and anolyte respectively, and the anolyte is at a concentration of 3.168 ...

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Abstract

The invention discloses a method for preparing sodium carbonate co-produced gypsum and basic magnesium carbonate by utilizing mirabilite and dolomite. The basic thought of the invention is to realize the product separation while accelerating reaction through membrane electrolysis; a plurality of reaction processes are fused into a same reaction system; sodium carbonate is prepared under low voltage, normal temperature and normal pressure; an optimized process scheme is designed according to the huge differences of the dissolving degrees of the sediments generated by calcium and magnesium ions combined with different negative ions; by-products in the alkali-making process can be converted into products with high additional values; and any three wastes are not generated in the processes of preparing sodium carbonate, gypsum and basic magnesium carbonate. According to the invention, the problem of the traditional chemical method for preparing sodium carbonate that chloride ions cannot be utilized and the use ratio of sodium ions is low can be solved; the sodium carbonate production with low energy consumption and high efficiency can be realized; a brand new method is provided for preparing sodium carbonate according to the chemical method; and the problems of high energy consumption, high environmental pollution, low efficiency and low additional values of the by-products of the sodium carbonate preparation method in the prior art can be solved.

Description

Technical field [0001] The invention relates to a method for preparing soda ash by using sodium sulfate as a source of sodium ions, in particular to a method for preparing soda ash and co-producing gypsum and basic magnesium carbonate by using sodium sulfate and dolomite as raw materials. Background technique [0002] Soda ash is one of the most important basic chemical raw materials and is called the "mother of chemical industry". Its output and consumption are usually used as one of the indicators to measure a country's industrial development level. Soda ash is widely used in construction field, chemical industry, metallurgical industry, printing and dyeing industry, leather industry, daily chemical industry, food industry. The glass industry in the construction sector is the largest consumer of soda ash, which consumes 0.2 tons of soda ash per ton of glass. In the chemical industry, it is used to make water glass, sodium dichromate, sodium nitrate, sodium fluoride, baking sod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00C01D7/12C01F5/24C01F11/46
CPCC01D7/126C01F5/24C01F11/46C01P2006/80
Inventor 王昱飞谢和平刘涛
Owner SICHUAN UNIV
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