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Method for producing sodium bicarbonate and sulfur from mirabilite by wet process

A heavy alkali and Glauber's salt technology, applied in the preparation/purification of sulfur, bicarbonate preparation, etc., can solve the problems of increased risk in the process, product use restrictions, etc., and achieve the effect of simple process

Inactive Publication Date: 2008-09-17
GANSU JINSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, as we all know, chromium is a poisonous substance, and calcium chromate is a recognized cancer treatment substance. Using it as a medium to produce heavy alkali will not only increase the risk in the process, but also will contain a small amount of dangerous substances in the product, and the use of the product will be affected. restricted

Method used

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  • Method for producing sodium bicarbonate and sulfur from mirabilite by wet process
  • Method for producing sodium bicarbonate and sulfur from mirabilite by wet process

Examples

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Effect test

Embodiment 1

[0045] A. Sodium sulfide preparation process: After mixing 100g of anhydrous Glauber's salt and 24g of coal, put it into porcelain platinum, put it into a muffle furnace and calcinate at 1050°C for 30 minutes, frit 56g, Na 2 The S content is 65%, and it is soaked with 480ml of water after grinding to contain Na 2 S7 5.8 g / l solution.

[0046] B, thermal carbonation process: first in Na 2 Add 95g of heavy alkali to the S clear liquid, boil at 100°C for 5 hours, the released H 2 The concentration of S gas reaches 90%-95%, and the sulfur with a purity of 95-98% is produced by the Claus method; secondly, the boiled solution is naturally cooled to 60-70°C, filtered while it is hot, and the slag is returned to the calcination process;

[0047] C. Sulfur preparation process: use 22% CO for the filtrate 2 The gas is carbonized under the pressure of 0.35MPa, the carbonization temperature is controlled at 50-70°C, and the discharge temperature at the bottom of the tower is controlled...

Embodiment 2

[0050] Embodiment 2: Same as Example 1, the difference is as follows, in the A step soda sulfide preparation process: after mixing with 100g of anhydrous Glauber's salt and 20g of coal, the calcining equipment is a reverberatory furnace, and the calcining temperature is adjusted to 1080°C, and calcined for 60 minutes. Melt block 55g, Na 2 The S content is 64.5%, and it is soaked with 480ml of water after grinding to contain Na 2 S7 3.80 g / l solution. Add 95g of heavy alkali, boil at 105°C for 6h, filter out impurities, and use 22% CO 2 The gas is carbonized under the pressure of 0.35MPa, and the filter cake is dried at 50°C to obtain 106.3g heavy alkali, NaHCO 3 Content 98.5%.

Embodiment 3

[0051] Example 3: Same as Example 2, the difference is as follows, in the step A of alkali sulfide preparation process: after mixing with 100g of anhydrous Glauber's salt and 22g of coal, the calcining equipment is a rotary kiln, and the calcining temperature is adjusted to 1065°C, and calcined for 45 minutes; Add 95g of heavy alkali, boil at 102°C for 3h, filter out impurities, and use 22% CO 2 The gas is carbonized under the pressure of 0.35MPa, and the filter cake is dried at 50°C to obtain 109.2g heavy alkali, NaHCO 3 Content 98.5%.

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Abstract

The invention discloses a method for clean method for producing sodium bicarbonate and sulphur by means of Glauber salt wet method for reducing the emission of CO2 and avoiding the discharge of wastewater, which comprises the following steps: A, sodium sulphide preparing process, B, hot carbonatation process, C, sulphur preparing process, D, cold carbonization process, and E, mother liquor purifying. Glauber salt coal is reduced and calcined into sodium sulphide, and the sodium sulphide solution is heated and carbonized into a mixed solution with the soda as the main component by use of sodium bicarbonate, then the mixed solution is cold-carbonated by CO2 to separate out NaHCO3 crystal, which is dried to finally obtain the soda in conformity with relevant standard. The production method has the advantages of simple process, environmental friendliness, no pollution, full circulation of the mother liquor, and no wastewater discharged.

Description

technical field [0001] The invention relates to a method for co-producing heavy alkali and sulfur by using Glauber's salt or chromium-containing Glauber's salt as a raw material. Background technique [0002] Most of the production methods of heavy alkali now use table salt as the raw material, the Viersau soda method or Hou's soda method or the direct production method of trona. The method of using Glauber's salt as a raw material to produce heavy alkali includes the Lubrand method in the early days, and the improved Lubrand method created by the former Soviet Union's Liezi Geqin Institute of Applied Chemistry. [0003] The early methods of making alkali from Glauber's salt all had the disadvantages of high energy consumption, discharge of waste water and waste gas, and the above methods have not been industrially adopted in my country so far. [0004] my country's thenardite reserves are extremely rich. With the gradual reduction of salt resources, there is no price advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/10C01B17/04
Inventor 韩登仑张忠元何喜善宋春林毛学芹
Owner GANSU JINSHI CHEM
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