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Crystallization control and whitening control method for producing boric acid and magnesium sulfate by salt lake type solid boron ore liquid boron ore

A control method and crystallization control technology, applied in the direction of magnesium sulfate, boron oxide, etc., can solve the problems of difficult filtration, increase of solution supersaturation, large amount of washing water, etc., and achieve good washing performance, better effect and lower cost Effect

Active Publication Date: 2008-09-03
青海利亚达化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It hinders the formation of boric acid and magnesium sulfate crystal nuclei, lowers the crystallization temperature point, and increases the supersaturation of the solution, often resulting in fine boric acid crystals, mostly fine flaky crystals, difficult to filter, more filtrate entrained in filter cake, and difficult to wash. The amount of washing water is large, so that the product yield loss is large, the crystalline state is uncontrolled and the color is yellow

Method used

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  • Crystallization control and whitening control method for producing boric acid and magnesium sulfate by salt lake type solid boron ore liquid boron ore
  • Crystallization control and whitening control method for producing boric acid and magnesium sulfate by salt lake type solid boron ore liquid boron ore
  • Crystallization control and whitening control method for producing boric acid and magnesium sulfate by salt lake type solid boron ore liquid boron ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put 9 tons of boron and magnesium ore into the acidification pot, add mother liquor, washing water and sulfuric acid to fully react, and the slurry volume is about 20 cubic meters. Hydrogen peroxide (H 2 o 2 ) according to 2.5kg / m 3 Add the amount of the mixture into the slurry and keep stirring for 30 minutes, then use a plate and frame filter press to remove the filter residue, and the filtrate is light yellow. When cooling and crystallizing, the pH of the solution is adjusted to acid repeatedly before 35°C, and the pH value is controlled between 2.8 and 4.1. When the temperature reaches 35°C, add acid to make the pH value below 2.5, and the crystals are white and coarse. Filter and wash easy. After drying, 3.69 tons of boric acid products were obtained.

[0024] Product Analysis Results: Boric Acid (H 3 BO 3 ) content % 99.50

[0025] Water insoluble content % 0.023

[0026] Sulfate (as SO 4 2- Total) content % 0.13

[0027] ...

Embodiment 2

[0031] 15 cubic acidified filtrates (reddish brown, H 3 BO 3 18% MgSO 4 27%) and hydrogen peroxide (H 2 o 2 ) according to 2.5kg / m 3 The amount was mixed, and after insulated and stirred for 30 minutes, the filtrate was light yellow. When cooling and crystallizing, the pH of the solution is adjusted to acid repeatedly before 35°C, and the pH value is controlled between 2.8 and 4.1. When the temperature reaches 35°C, add acid to make the pH value below 2.5, and the crystals are white and coarse. Filter and wash Easy, 2.2 tons of boric acid products are obtained after drying.

[0032] Product Analysis Results: Boric Acid (H 3 BO 3 ) content % 99.55

[0033] Water insoluble content % 0.024

[0034] Sulfate (as SO 4 2- Total) content % 0.15

[0035] Chloride (as Cl - Total) content % 0.068

[0036] Iron (Fe) content % 0.0020

[0037] Color: white

Embodiment 3

[0039] Crude boric acid is added with water to form boric acid (H 3 BO 3 ) 19% solution 15 party, the solution is yellow, hydrogen peroxide (H 2 o 2 ) according to 0.5kg / m 3 After adding, heat preservation and stirring for 30 minutes, use a plate and frame filter press to remove the filter residue, and the filtrate is light yellow. When cooling and crystallizing, the pH of the solution is adjusted to acid repeatedly before 35°C, and the pH value is controlled between 2.8 and 4.1. When the temperature reaches 35°C, add acid to make the pH value below 2.5, and the crystals are white and coarse. Filter and wash Easy, 2.3 tons of boric acid products are obtained after drying.

[0040] Product Analysis Results: Boric Acid (H 3 BO 3 ) content % 99.55

[0041] Water insoluble content % 0.015

[0042] Sulfate (as SO 4 2- Total) content % 0.13

[0043] Chloride (as Cl - Total) content % 0.060

[0044] Iron (Fe) conten...

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Abstract

The invention belongs to the technology field of chemical industry and relates particularly to a crystallization and whitening control method of preparing boric acid and magnesium sulfate based on the salt lake type solid boron ore and liquid boron ore. The original technological process for preparing the boric acid from the salt lake type solid boric acid includes using acidifying szaibelyite, water, boron-containing mother liquor and boron-containing wash water as the material, acidificating with sulfuric acid, filtering, cooling and crystallizing, centrifugalizating, washing, further centrifugalizating, drying and obtaining the boric acid. Based on the process, the method adds the operational process of repeatedly adjusting the acidity to strictly control the pH value range to the process of chemical decolorization and cooling and crystallizing, heat preservation chemical decolorization of the acidified slurry or the acidified and filtered filtrate and repeatedly adjusting the acidity to strictly control the pH value range of the cooled and crystallized solution. The chemical decolorizer is employed to remove the colored ferric iron, algae, and organic matter in solution and improve the crystalline state, and the pH value of the cooled and crystallized solution is controlled by repeatedly adjusting acid to obtain the white boric acid granular crystals. The white boric acid granular crystals have good filtering property, washing property and high yield. The method can be widely used in the production of boric acid from the salt lake type boron ore.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for crystallization control and whitening control of boric acid and magnesium sulfate produced from salt lake type solid boron ore and liquid boron ore. Background technique [0002] Salt lake type boron ore includes solid boron ore and liquid boron ore. Solid boron ores such as pillarite, sorbite, hydroborite, reservoir boronite, hyoborite, etc. The production of boric acid is the most widely used sulfuric acid decomposition process. The main process is to acidify boron magnesium ore, water and sulfuric acid, filter to remove the filter residue, and control the pH of the filtrate below 2.5 (so that the crystallization can be completed), cooling and crystallization, centrifugal separation to remove the mother liquor, washing with water, and centrifugal separation to remove the washing water , and the boric acid product is obtained after drying. The mother li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/10C01F5/40
Inventor 李洪岭曹闽生刘海云
Owner 青海利亚达化工有限公司
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