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Low-phosphorus low-boron high-pure anhydrous sodium carbonate and preparation method thereof

A technology of anhydrous sodium carbonate and sodium carbonate, applied in alkali metal carbonates, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as unsatisfactory needs, and achieve the effect of high product quality and simple process

Active Publication Date: 2008-03-26
TIANJIN BOHUA YONGLI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the rapid development of electronics, industrial silicon and other industries, users use the existing quality standards of soda ash, phosphorus, boron and other indicators can not meet the needs, and put forward new and higher quality requirements for soda ash quality

Method used

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  • Low-phosphorus low-boron high-pure anhydrous sodium carbonate and preparation method thereof

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preparation example Construction

[0017] A preparation method of low-phosphorus, boron high-purity anhydrous sodium carbonate, which comprises the following steps: (a) edible soda ash, purified water with an impurity mass percentage content below 0.01%, and purified water with a mass percentage content above 99% Caustic soda is added into the chemical material tank and fully reacted and stirred at a temperature of 80--105°C and normal pressure. The concentration of caustic soda in the edible soda ash is 360--400 grams per liter, and the addition amount of the caustic soda is 50-80 kg / ton of edible soda ash; (b) use a pump to send the reacted material to an insulated clarifier for further reaction, and the temperature of the clarifier is 60--80°C; (c) extract it from the clarifier The clear liquid enters the filter tank to filter, and the filtered filtrate flows into the filtrate tank by itself; (d) pump the clear liquid in the filtrate tank to the evaporator for evaporation, and the pressure of the evaporator i...

Embodiment 1

[0025] Add edible soda ash, purified water with an impurity mass percentage of 0.008-0.009%, and caustic soda with a mass percentage content of 99.01-99.5% into the chemical tank, fully react and stir at a temperature of 80°C and normal pressure , the alkali concentration of described edible soda ash is 380 grams / liter, and the add-on of described caustic soda is 60 kilograms / ton edible soda ash; The material after reaction is delivered to further reaction in the insulation clarifier tank with pump, described The temperature of the clarification tank is 70°C, and additives are added in the clarification tank, and the addition amount is 50ml / m 3 The clear liquid of the clarifier barrel enters the shower head filter tank to filter, and the filtered filtrate flows into the filtrate tank by itself; the filtrate in the filtrate tank is beaten to the evaporator with a pump to evaporate, and the pressure of the evaporator is controlled at 0.5MPa, The temperature of the evaporator is ...

Embodiment 2

[0027] Add edible soda ash, purified water with an impurity mass percentage of 0.01-0.009%, and caustic soda with a mass percentage content of 99.05-99.2% into the chemical tank, fully react and stir at a temperature of 90°C and normal pressure , the alkali concentration of described edible soda ash is 400 grams / liter, and the add-on of described caustic soda is 60 kilograms / ton edible soda ash; The material after reaction is delivered to further reaction in the insulation clarifier tank with pump, described The temperature of the clarification tank is 60°C, and additives are added in the clarification tank, and the addition amount is 100ml / m 3 The clear liquid of the clarifier enters the shower head filter tank and filters, and the filtered filtrate flows into the filtrate tank by itself; the filtrate in the filtrate tank is beaten to the evaporator with a pump to evaporate, and the pressure of the evaporator is controlled at 0.4MPa. The temperature of the evaporator is 105°C...

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Abstract

The present invention discloses one kind of high purity anhydrous sodium carbonate product with low P and B content and its preparation process. The preparation process includes the following steps: 1. reaction of sodium carbonate, pure water and sodium hydroxide in a reactor; 2. further reaction of the materials in a heat insulating and setting tank; 3. filtering to obtain filtrate; 4. evaporating the filtrate in an evaporator to crystallize; 5. washing the crystallized material in a centrifuge and solid-liquid separating; and 6. drying in a drying bed. The preparation process is simple and the prepared anhydrous sodium carbonate product has high quality and P and B content lower than 5 ppm.

Description

technical field [0001] The invention relates to a high-purity anhydrous sodium carbonate, in particular to a low-phosphorus and boron high-purity anhydrous sodium carbonate and a preparation method thereof. Background technique [0002] At present, the anhydrous sodium carbonate products produced at home and abroad mainly contain the following varieties: 1. Light soda ash (can be divided into industrial soda ash and edible soda ash), 2. Heavy soda ash, 3. Reagent grade anhydrous sodium carbonate (can be divided into industrial soda ash and edible soda ash). It is divided into chemical purity, analytical purity, and superior purity), and there is no separate requirement for the two indicators of phosphorus and boron in the above product quality standards, and there is no targeted detection. With the rapid development of electronics, industrial silicon and other industries, users use existing quality standards of soda ash, phosphorus, boron and other indicators can not meet th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C01D7/22
Inventor 鲁泳刘承新刘建华杜立永
Owner TIANJIN BOHUA YONGLI CHEM IND
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