Method for treating magnesium sulfate mather slution after producing boric acid by sulfuric acid method

A treatment method, technology of sulfuric acid method, applied in water/sewage treatment, chemical instruments and methods, chilled water/sewage treatment, etc. The effect of less boron

Inactive Publication Date: 2004-12-15
尹德文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the most important problem that magnesium sulfate mother liquor is difficult to handle in the production...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The concentration of magnesium sulfate used is 315kg / m 3 The magnesium sulfate mother liquor, adopts following processing step to process:

[0020] (1) first heating the mother liquor to 95°C;

[0021] (2) adding solid ammonium sulfate in the mother liquor, the weight ratio of ammonium sulfate and magnesium sulfate is 1: 1, after making it dissolve, stand-by;

[0022] (3) The liquid generated in step (2) is filtered using a plate and frame filter press under normal pressure to remove impurities, and the filtration temperature is 95° C.;

[0023] (4) above-mentioned liquid is cooled, and crystallization is separated out ammonium magnesium sulfate;

[0024] (5) the magnesium ammonium sulfate that crystallizes out is carried out spin-drying and oven-drying treatment, after drying, the magnesium ammonium sulfate of crystallization is packed;

[0025] (6) Return remaining mother liquor to the reactor of producing boric acid by sulfuric acid method.

[0026] Experiments s...

Embodiment 2

[0028] The concentration of magnesium sulfate used is 270kg / m 3 The magnesium sulfate mother liquor, adopts following processing step to process:

[0029] (1) first heating the mother liquor to 98°C;

[0030] (2) adding solid ammonium sulfate in the mother liquor, the weight ratio of ammonium sulfate and magnesium sulfate is 1.2: 1, make it stand-by after dissolving;

[0031] (3) The liquid generated in step (2) is filtered using a plate and frame filter press under normal pressure to remove impurities, and the filtration temperature is 96° C.;

[0032] (4) above-mentioned liquid is cooled, and crystallization is separated out ammonium magnesium sulfate;

[0033] (5) the magnesium ammonium sulfate that crystallizes out is carried out spin-drying and oven-drying treatment, after drying, the magnesium ammonium sulfate of crystallization is packed;

[0034] (6) Return remaining mother liquor to the reactor of producing boric acid by sulfuric acid method.

[0035] Experiments ...

Embodiment 3

[0037] The concentration of magnesium sulfate used is 276kg / m 3 The magnesium sulfate mother liquor, adopts following processing step to process:

[0038] (1) first heating the mother liquor to 100°C;

[0039] (2) solid ammonium sulfate is added in the mother liquor, the weight ratio of ammonium sulfate and magnesium sulfate is 1.4: 1, after making it dissolve, stand-by;

[0040] (3) The liquid generated in step (2) is filtered using a plate and frame filter press under normal pressure to remove impurities, and the filtration temperature is 98° C.;

[0041] (4) above-mentioned liquid is cooled, and crystallization is separated out ammonium magnesium sulfate;

[0042] (5) the magnesium ammonium sulfate that crystallizes out is carried out spin-drying and oven-drying treatment, after drying, the magnesium ammonium sulfate of crystallization is packed;

[0043] (6) Return remaining mother liquor to the reactor of producing boric acid by sulfuric acid method.

[0044] Experime...

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PUM

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Abstract

The technological scheme of the present invention is the magnesium sulfate mother solution treating process including: heating the mother solution to 95-100 deg.c, adding solid ammonium sulfate into the mother solution to produce magnesium ammonium sulfate with the weight ratio between ammonium sulfate and magnesium sulfate being 1-1.4, filtering the produced solution, lowering the temperature to crystallize and separate magnesium ammonium sulfate, and drying. The said process needs no concentration while extracting over 80% of magnesium sulfate, and has fast production speed, low power consumption and low cost. In addition, the said process has reduced loss of barium and less environmental pollution. The produced magnesium ammonium sulfate is one excellent fertilizer with nitrogen, magnesium and sulfur.

Description

technical field [0001] The invention relates to a method for treating magnesium sulfate mother liquor after boric acid is produced by a sulfuric acid method. Background technique [0002] Boric acid is a chemical product with a wide range of uses. At present, the sulfuric acid method is widely used in the industry to produce boric acid, that is, boric magnesium ore powder is added with sulfuric acid to directly produce boric acid, also known as "one-step method". In addition, large-scale industrial production usually uses a "two-step method", that is, firstly uses boron ore powder to produce borax (Na 2 B 4 o 7 .10H 2 O), then add sulfuric acid with borax to produce boric acid. The "two-step method" has complex process equipment and large production investment, and only boron in boron ore is proposed. More than 80% of other components in boron ore have become slag public hazards, polluting the environment, and boron ore cannot be comprehensively utilized, resulting in ...

Claims

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Application Information

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IPC IPC(8): B01D9/02C02F1/22C02F1/58
Inventor 尹德文
Owner 尹德文
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