Process for producing sodium selenite

A technology for preparing sodium selenite, which is applied in the direction of sodium/potassium compounds, selenium/tellurium compounds, alkali metal compounds, etc., can solve the problems of high sodium carbonate price, increased production cost and danger of sodium selenite, and achieve The production process is simple, the operation is simple and convenient, and the investment in production equipment is small.

Inactive Publication Date: 2008-01-16
FIRST RARE MATERIALS CO LTD
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Problems solved by technology

But this production technique can produce a large amount of carbon dioxide this greenhouse gas (impact on the environment) in the production process, can h

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  • Process for producing sodium selenite

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Embodiment 1

[0030] A preparation technique for sodium selenite, comprising the following technical steps:

[0031] 1. Add 1000L of water to the stirring tank, and put in 500kg of selenium dioxide, and start stirring to dissolve;

[0032] 2. After the selenium dioxide is completely dissolved, in the stirring tank, slowly add 360 kg of sodium hydroxide (99% mass concentration) to adjust the pH value, and synthesize sodium selenite.

[0033] 3. Then weigh 0.4kg of the additive, dissolve the additive in water, add it to the stirring tank, and stir evenly; then add 0.5kg of the adsorbent, and stir for 1 hour;

[0034] 4. Subsequently, the sodium selenite solution is filtered, and the clear solution is transported into the reaction kettle, heated and evaporated, so that the solution forms a supersaturated state, and sodium selenite crystallizes out from the solution;

[0035] 5. Transport the sodium selenite crystals with crystal water into the centrifuge, and turn on the centrifuge for centri...

Embodiment 2

[0038] A preparation technique for sodium selenite, comprising the following technical steps:

[0039] 1. Add 2000L of water to the stirring tank, and put in 1000kg of selenium dioxide, and start stirring to dissolve;

[0040] 2. After selenium dioxide dissolves completely, in stirring tank, slowly add sodium hydroxide (99% mass concentration) 720kg to adjust pH value, synthetic sodium selenite.

[0041] 3. Then, weigh 800g of the additive, dissolve the additive in water, add it to the stirring tank, and stir evenly; then add 1kg of the adsorbent, and stir for 2 hours;

[0042] 4. Subsequently, the sodium selenite solution is filtered, and the clear solution is transported into the reaction kettle, heated and evaporated, so that the solution forms a supersaturated state, and sodium selenite crystallizes out from the solution;

[0043] 5. Transport the sodium selenite crystals with crystal water into the centrifuge, and turn on the centrifuge for centrifugal dehydration. The ...

Embodiment 3

[0046] A preparation technique for sodium selenite, comprising the following technical steps:

[0047] 1. Add 3000L of water into the stirring tank, and put in 1500kg of selenium dioxide, and start stirring to dissolve.

[0048] 2. After selenium dioxide is completely dissolved, in the stirring tank, slowly add sodium hydroxide (99% mass concentration) 1080kg to adjust the pH value, and synthesize sodium selenite.

[0049] 3. Then, weigh 1.2 kg of the additive. Dissolve the additive in water, add it into the stirring tank, and stir evenly; then add 1.5 kg of adsorbent and stir for 5 hours.

[0050] 4. Subsequently, the sodium selenite solution is filtered, and the clear solution is transported into the reaction kettle, heated and evaporated to make the solution form a supersaturated state, and the sodium selenite crystallizes out from the solution.

[0051] 5. Transport the sodium selenite crystals with crystal water into the centrifuge, and turn on the centrifuge for centri...

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Abstract

The present invention relates to a production technology of sodium selenite. The invention comprises the following steps: 1. a proper amount of selenium dioxide is dissolved in water to form selenious acid solution; 2. sodium hydroxide is added to the selenious acid solution and the pH value is adjusted to 7 to 14; 3, a proper amount of additive and adsorbent is added; 4, filtration, evaporation and crystallization; 5, heating, drying, crushing and screening; 6, finished sodium selenite product. The sodium selenite production technology of the invention has the advantages of simple production technology, less production equipment investment, as well as simple and convenient operation, and is a highly efficient and energy-saving sodium selenite preparation technology.

Description

technical field [0001] The invention relates to a production process of sodium selenite. Background technique [0002] Sodium selenite is an important chemical product; white crystal, easily soluble in water, tetragonal crystal. Main application areas: used as decolorizer for glass, and feed additive. [0003] The main production method of present sodium selenite is sodium carbonate method. The production process is to add sodium carbonate to a selenous acid solution in a certain amount, and then evaporate and crystallize the solution to obtain sodium selenite crystals. The production process utilizes the principle that sodium carbonate and selenous acid react to generate sodium selenite. But this production technique can produce a large amount of carbon dioxide this greenhouse gas (impact on the environment) in the production process, can have certain danger in industrialized production; Simultaneously the price of sodium carbonate is higher, thereby incre...

Claims

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Application Information

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IPC IPC(8): C01D13/00C01B19/00
Inventor 朱世会朱世明朱刘刘留
Owner FIRST RARE MATERIALS CO LTD
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