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A preparation method of special calcium carbonate for optical glass and the calcium carbonate

A technology of calcium carbonate and acid hydrolysis, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problem of high cost of separation of color forming elements, and achieve the effect of low-cost separation

Inactive Publication Date: 2015-08-05
GUIZHOU REDSTAR DEVING
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to overcome the defect of high separation cost of color-forming elements (heavy metals) in existing calcium carbonate, to provide a calcium carbonate and its preparation method, the heavy metals can be fully separated, and can be applied to optical glass

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  • A preparation method of special calcium carbonate for optical glass and the calcium carbonate
  • A preparation method of special calcium carbonate for optical glass and the calcium carbonate

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preparation example Construction

[0026] A preparation method of calcium carbonate, the method comprising:

[0027] (1) Acid hydrolysis process

[0028] Add hydrochloric acid solution to calcium carbonate ore powder to carry out acidolysis reaction, control the [Ca 2+ ] at 0.5-3.5mol / L, adjust the pH value to 10-11 after the reaction finishes;

[0029] When the concentration of calcium ions is low, certain heavy metals will remain in calcium carbonate products. The present invention controls the concentration of calcium ions at 0.5-3.5 mol / L, fully separates color-forming elements (heavy metals), and realizes the low-cost separation of color-forming elements in calcium carbonate products.

[0030] (2) Impurity removal process

[0031] According to [S 2- ] / [Fe]=1.5-2.0 / 1.0 molar ratio to add 100 ~ 150g / L alkaline earth metal sulfide solution; then, according to [SO4 2- ] / Alkaline earth metal divalent ions = 1.1-1.5 / 1.0 molar ratio, add ammonium sulfate, stir and heat up to 50-60°C, keep stirring for 20-50...

Embodiment 1

[0068] (1) Acid hydrolysis process

[0069] CaCO 3 The ore powder is placed in an acid-resistant stirring tank, and 31% industrial hydrochloric acid is added to dissolve it to carry out acidolysis reaction. [Ca 2+ ] at 0.541mol / L. The process is carried out for a period of time, and the subsequent (3) metathesis process produces a solid-liquid separation mother liquor, and after the calcium chloride solution is recovered from the mother liquor, the calcium chloride solution (CaCl 2 ) cycle back to the (1) acid hydrolysis process, and add it to the acid-resistant stirring tank before adding hydrochloric acid for dissolution.

[0070] CO generated during the recovery reaction 2 The gas is used for the subsequent synthesis of ammonium carbonate after purification. After the acidolysis reaction was completed, CaO was used to adjust the pH value to 10.

[0071] (2) Impurity removal process

[0072] According to [S 2- ] / [Fe]=2.0 / 1.0 molar ratio by adding a clear 100g / L barium...

Embodiment 2

[0078] (1) Acid hydrolysis process

[0079] CaCO 3 The ore powder is placed in an acid-resistant stirring tank, and 31% industrial hydrochloric acid is added to dissolve it to carry out acidolysis reaction. [Ca 2+ ] at 2.660mol / L. The process is carried out for a period of time, and the subsequent (3) metathesis process produces a solid-liquid separation mother liquor, and after the calcium chloride solution is recovered from the mother liquor, the calcium chloride solution (CaCl 2 ) cycle back to the (1) acid hydrolysis process, and add it to the acid-resistant stirring tank before adding hydrochloric acid for dissolution.

[0080] CO generated during the recovery reaction 2 The gas is used for the subsequent synthesis of ammonium carbonate after purification. After the acidolysis reaction was completed, CaO was used to adjust the pH value to 10.5.

[0081] (2) Impurity removal process

[0082] According to [S 2- ] / [Fe]=1.5 / 1.0 molar ratio by adding a clear 125g / L bari...

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Abstract

The invention discloses a preparation method of calcium carbonate for optical glass and calcium carbonate. The method comprises the following steps of (1), an acidolysis process, namely, adding a hydrochloric acid solution to calcium carbonate mineral powder for carrying out acidolysis reaction, controlling the [Ca<2+>] in the solution which is obtained by the reaction to 0.5mol / L-3.5mol / L, and regulating the pH value after the reaction is finished to 10-11; (2), a purification process, namely, adding 100g / L-150g / L of alkaline-earth metal sulfide solution according to a molar ratio of [S<2->] / [Fe] equal to (1.5-2.0) / 1.0, adding ammonium sulfate according to the molar ratio of [SO4<2->] / alkaline-earth metal divalent ion equal to (1.1-1.5) / 1.0, stirring and heating up to 50 DEG C-60 DEG C, and separating to obtain the purified calcium chloride solution after being continuously stirred for 20-50 minutes; and (3), a double decomposition process, namely, reacting the calcium chloride solution obtained in the step (2) with an ammonium carbonate solution, carrying out solid-liquid separation, and washing and drying the solid so as to obtain the calcium carbonate product. The alkaline-earth metal sulfide is utilized for completely separating coloring elements (heavy metals), so that the low-cost separation of the coloring elements in the calcium carbonate product is realized.

Description

technical field [0001] The invention relates to a calcium carbonate and a preparation method thereof, in particular to a special calcium carbonate for optical glass and a preparation method thereof. Background technique [0002] Optical glass, including micro-cameras and flat-panel display glass substrates, has extremely strict requirements on the coloring elements in the required materials. Compounds such as silicon, barium, and strontium in the formula materials are easier to meet the basic requirements due to the characteristics of raw materials and preparation processes. However, there has been no special preparation process for calcium carbonate materials for a long time, which restricts the formulation utilization of products. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the defect of high separation cost of color-forming elements (heavy metals) in existing calcium carbonate, and provide a calcium carbo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 姜志光华东高月飞蒋友良
Owner GUIZHOU REDSTAR DEVING
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