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Method for preparing spherical calcite type calcium carbonate from high-calcium sodium sulfate type brine

A high-calcium sodium sulfate, calcite-type technology is applied in the field of preparing spherical calcite-type calcium carbonate, which can solve the problems of low impurity ion content and difficult removal of impurities, and achieve the effects of environmental friendliness, low cost, and continuous and controllable operation procedures.

Active Publication Date: 2021-04-09
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the content of impurity ions in brine is low, and the preparation process does not require additional additives to introduce impurity ions, which solves the problem that impurities are difficult to remove in the traditional calcium carbonate preparation process, and realizes the resource utilization of calcium in high-calcium sodium sulfate brine

Method used

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  • Method for preparing spherical calcite type calcium carbonate from high-calcium sodium sulfate type brine
  • Method for preparing spherical calcite type calcium carbonate from high-calcium sodium sulfate type brine
  • Method for preparing spherical calcite type calcium carbonate from high-calcium sodium sulfate type brine

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Experimental program
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Effect test

Embodiment 1

[0018] The method for preparing spherical calcite type calcium carbonate from high calcium sodium sulphate type brine, it may further comprise the steps:

[0019] (1) Add 1L high-calcium sodium sulfate brine (the ingredients in high-calcium sodium sulfate brine include NaCl, Na 2 SO 4 , CaSO 4 , MgSO 4 and MgCl 2 , where NaCl concentration is 305.71g / L, Na 2 SO 4 Concentration 21.42g / L, Ca 2+ Concentration 486mg / L, Mg 2+ Concentration 30mg / L), at a temperature of 20°C, add 1.3gNa 2 CO 3 (Na in brine 2 CO 3 Concentration is 1.3g / L) and 0.15gNaOH (NaOH concentration in brine is 0.15g / L), control the brine pH=10.5~11.5, stir for 30min at the stirring speed of 300r / min, add 5mg of polyacrylamide after stirring Flocculant (the concentration of polyacrylamide flocculant in brine is 5mg / L), adjust the speed to 50r / min and continue to stir for 10min, then let it settle for 2h to obtain solid product A;

[0020] (2) Wash the solid product A obtained in step (1) with deioniz...

Embodiment 2

[0025] The method for preparing spherical calcite type calcium carbonate from high calcium sodium sulphate type brine, it may further comprise the steps:

[0026] (1) Add 1L high-calcium sodium sulfate brine (the ingredients in high-calcium sodium sulfate brine include NaCl, Na 2 SO 4 , CaSO 4 , MgSO 4 and MgCl 2 , where NaCl concentration is 305.71g / L, Na 2 SO 4 Concentration 21.42g / L, Ca 2+ Concentration 587.1 mg / L, Mg 2+ Concentration 48.24mg / L), at a temperature of 40°C, add 1.42gNa 2 CO 3 (Na in brine 2 CO 3 Concentration is 1.42g / L) and 0.21gNaOH (NaOH concentration in brine is 0.21g / L), control brine pH=10.5~11.5, stir for 30min under the condition of stirring speed 350r / min, add 10mg polyacrylamide after stirring Flocculant (the concentration of polyacrylamide flocculant in brine is 10mg / L), adjust the rotation speed to 75r / min and continue to stir for 20min, then let it settle for 2h to obtain solid product A;

[0027](2) Wash the solid product A obtained ...

Embodiment 3

[0032] The method for preparing spherical calcite type calcium carbonate from high calcium sodium sulphate type brine, it may further comprise the steps:

[0033] (1) Add 1L high-calcium sodium sulfate brine (the ingredients in high-calcium sodium sulfate brine include NaCl, Na 2 SO 4 , CaSO 4 , MgSO 4 and MgCl 2 , where NaCl concentration is 307.18g / L, Na 2 SO 4 Concentration 21.27g / L, Ca 2+ Concentration 762.8mg / L, Mg 2+ Concentration 47.1mg / L), at a temperature of 40°C, add 1.5gNa 2 CO 3 (Na in brine 2 CO 3 Concentration is 1.5g / L) and 0.35gNaOH (the concentration of NaOH in brine is 0.35g / L), control brine pH=10.5~11.5, stir for 120min at the stirring speed of 400r / min, add 15mg of polyacrylamide after stirring Flocculant (the concentration of polyacrylamide flocculant in brine is 15mg / L), adjust the speed to 100r / min and continue to stir for 30min, then let it settle for 2h to obtain solid product A;

[0034] (2) Wash the solid product A obtained in step (1) w...

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Abstract

The invention relates to a method for preparing spherical calcite type calcium carbonate from high-calcium sodium sulfate type brine, and belongs to the technical field of material chemical engineering. The method comprises the following steps: adding 1.3-1.5 g / L of Na2CO3 and 0.15-0.35 g / L of NaOH into the high-calcium sodium sulfate type brine at the temperature of 20-40 DEG C, controlling the pH value of the brine to be 10.5-11.5, stirring for 30-120 minutes, adding 5-15mg / L of polyacrylamide flocculant after the stirring is finished, continuously stirring for 10-30 minutes, and then standing and settling to obtain a solid product A; washing the obtained solid product A with deionized water of which the pH value is equal to 7-9 to remove sodium, chlorine and magnesium soluble salts to obtain a solid product B, and drying the solid product B to obtain spherical calcite type calcium carbonate. The method has the advantages of simple preparation raw material source, equipment and preparation process, low cost, reaction at room temperature, environmental friendliness, green and environment-friendly process, and continuous and controllable operation procedure.

Description

technical field [0001] The invention relates to a method for preparing spherical calcite-type calcium carbonate from high-calcium sodium sulfate brine, belonging to the technical field of material chemical industry. Background technique [0002] Calcite, Aragonite and Vaterite are three common anhydrous forms of calcium carbonate, and calcite-type calcium carbonate is the most thermodynamically stable of the three crystal forms. Spherical calcite calcium carbonate has outstanding advantages such as thermodynamic stability, large specific surface area, small specific gravity, good smoothness and smoothness, and can significantly improve the filling performance of inks, plastics, coatings, etc. and the coating properties of paper. Therefore, it is of great significance to develop a kind of easy method for preparing spherical calcite type calcium carbonate. [0003] At present, the methods for preparing spherical calcite calcium carbonate mainly include carbonization and doubl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/18C01P2004/32C01P2002/72C01P2002/82C01P2004/03C01P2002/85C01P2006/80
Inventor 罗兴国李俊杰李兴彬何劲魏昶邓志敢李继东李旻廷
Owner KUNMING UNIV OF SCI & TECH