Method for removing impurity of mother liquid in preparation process of calcium carbonate crystal whisker

Abstract

The invention relates to a method for removing impurity of mother liquid in a preparation process of calcium carbonate crystal whisker, comprising the following steps of: (1) adding a barium chloride solid into the mother liquid in the preparation process of calcium carbonate crystal whisker; stirring the mixture to react for 0.5-2h at the normal temperature; and filtering in vacuum to obtain themother liquid subjected to the removal of sulfate radical; (2) adding a calcium removing agent in the mother liquid subjected to the removal of the sulfate radical; introducing CO2, stirring the mixture to react until a pH value of the mother liquid is 7; stopping aeration, and filtering in vacuum to obtain the mother liquid subjected to the removal of calcium; and (3) adding a flocculating agentwith mass concentration of 5 thousandth; stirring, standing and precipitating the mixture; and filtering in vacuum to remove the impurity. The invention has the advantages of simple operation and high impurity removal efficiency.

Description

technical field

[0001] The invention relates to the technical field of inorganic salt materials, in particular to a method for removing impurities from mother liquor in a calcium carbonate whisker production process. Background technique

[0002] At present, the methods for preparing calcium carbonate whiskers are mainly soluble calcium salt and carbonate preparation method, urea hydrolysis method, heating hydrolysis method with calcium bicarbonate, Ca(OH) 2 -CO 2 Gas-liquid reaction synthesis method, etc. Magnesium chloride is used as the crystal form control agent, and the calcium carbonate whiskers prepared by the carbonization method generally use quicklime as the raw material, bischofite as the crystal form control agent, and the calcium carbonate whiskers are prepared by the carbonation reaction of carbon dioxide. In this process, the main component of the mother liquor after whisker slurry filtration is magnesium chloride, in the follow-up preparation process of cal...

Examples

Embodiment 1

[0018] The impurity removal method of mother liquor in a kind of calcium carbonate whisker production technology of embodiment 1 comprises the following steps:

[0019] (1) Put the mother liquor in the calcium carbonate whisker production process into the reaction kettle, and add barium chloride solid, stir and react at a rate of 130r / min for 0.5h at normal temperature, and carry out vacuum filtration (WLW-100 vacuum pump, pumping speed 100L / S, after rotating speed 350r / min), obtain the mother liquor that removes sulfate radical.

[0020] Wherein the mother liquor composition in the calcium carbonate whisker production process is (g / L): SO 4 2- 0.9696, Ca 2+ 1.12, Mg 2+ 10.1664 and a small amount of particle impurities; the ratio of barium chloride to the amount of sulfate in the mother liquor is 0.9:1.

[0021] (2) Add calcium remover to the mother liquor for removing sulfate radicals, stir at a speed of 130r / min, and feed CO 2 , stirred and reacted until the pH value of...

Embodiment 2

[0026] The impurity removal method of mother liquor in a kind of calcium carbonate whisker production technology of embodiment 2 comprises the following steps:

[0027] (1) Put the mother liquor in the calcium carbonate whisker production process into the reactor, add barium chloride solid, stir and react at a rate of 130r / min for 2h at normal temperature, and vacuum filter to obtain the mother liquor that removes sulfate radicals.

[0028] Wherein the mother liquor composition in the calcium carbonate whisker production process is (g / L): SO 4 2- 0.9696, Ca 2+ 1.12, Mg 2+ 10.1664 and a small amount of particulate impurities; the ratio of barium chloride to the amount of sulfate in the mother liquor is 1:1.

[0029] (2) Add calcium remover to the mother liquor for removing sulfate radicals, stir at a speed of 130r / min, and feed CO 2 , stirring and reacting until the pH value of the mother liquor is 7, stop the aeration, and perform vacuum filtration to obtain the mother liq...

Embodiment 3

[0034] The impurity removal method of mother liquor in a kind of calcium carbonate whisker production technology of embodiment 3 comprises the following steps:

[0035] (1) Put the mother liquor in the calcium carbonate whisker production process into the reactor, and add barium chloride solid, stir and react at a rate of 130r / min for 1.5h at normal temperature, after vacuum filtration, obtain the mother liquor that removes the sulfate radical .

[0036] Wherein the mother liquor composition in the calcium carbonate whisker production process is (g / L): SO 4 2- 0.9696, Ca 2+ 1.12, Mg 2+ 10.1664 and a small amount of particulate impurities; the ratio of barium chloride to the amount of sulfate in the mother liquor is 0.95:1.

[0037] (2) Add calcium remover to the mother liquor for removing sulfate radicals, stir at a speed of 130r / min, and feed CO 2 , stirring and reacting until the pH value of the mother liquor is 7, stop the ventilation, and obtain the mother liquor from...

technical field

[0001] The invention relates to the technical field of inorganic salt materials, in particular to a method for removing impurities from mother liquor in a calcium carbonate whisker production process. Background technique

[0002] At present, the methods for preparing calcium carbonate whiskers are mainly soluble calcium salt and carbonate preparation method, urea hydrolysis method, heating hydrolysis method with calcium bicarbonate, Ca(OH) 2 -CO 2 Gas-liquid reaction synthesis method, etc. Magnesium chloride is used as the crystal form control agent, and the calcium carbonate whiskers prepared by the carbonization method generally use quicklime as the raw material, bischofite as the crystal form control agent, and the calcium carbonate whiskers are prepared by the carbonation reaction of carbon dioxide. In this process, the main component of the mother liquor after whisker slurry filtration is magnesium chloride, in the follow-up preparation process of cal...

Examples

Embodiment 1

[0018] The impurity removal method of mother liquor in a kind of calcium carbonate whisker production technology of embodiment 1 comprises the following steps:

[0019] (1) Put the mother liquor in the calcium carbonate whisker production process into the reaction kettle, and add barium chloride solid, stir and react at a rate of 130r / min for 0.5h at normal temperature, and carry out vacuum filtration (WLW-100 vacuum pump, pumping speed 100L / S, after rotating speed 350r / min), obtain the mother liquor that removes sulfate radical.

[0020] Wherein the mother liquor composition in the calcium carbonate whisker production process is (g / L): SO 4 2- 0.9696, Ca 2+ 1.12, Mg 2+ 10.1664 and a small amount of particle impurities; the ratio of barium chloride to the amount of sulfate in the mother liquor is 0.9:1.

[0021] (2) Add calcium remover to the mother liquor for removing sulfate radicals, stir at a speed of 130r / min, and feed CO 2 , stirred and reacted until the pH value of...

Embodiment 2

[0026] The impurity removal method of mother liquor in a kind of calcium carbonate whisker production technology of embodiment 2 comprises the following steps:

[0027] (1) Put the mother liquor in the calcium carbonate whisker production process into the reactor, add barium chloride solid, stir and react at a rate of 130r / min for 2h at normal temperature, and vacuum filter to obtain the mother liquor that removes sulfate radicals.

[0028] Wherein the mother liquor composition in the calcium carbonate whisker production process is (g / L): SO 4 2- 0.9696, Ca 2+ 1.12, Mg 2+ 10.1664 and a small amount of particulate impurities; the ratio of barium chloride to the amount of sulfate in the mother liquor is 1:1.

[0029] (2) Add calcium remover to the mother liquor for removing sulfate radicals, stir at a speed of 130r / min, and feed CO 2 , stirring and reacting until the pH value of the mother liquor is 7, stop the aeration, and perform vacuum filtration to obtain the mother liq...

Embodiment 3

[0034] The impurity removal method of mother liquor in a kind of calcium carbonate whisker production technology of embodiment 3 comprises the following steps:

[0035] (1) Put the mother liquor in the calcium carbonate whisker production process into the reactor, and add barium chloride solid, stir and react at a rate of 130r / min for 1.5h at normal temperature, after vacuum filtration, obtain the mother liquor that removes the sulfate radical .

[0036] Wherein the mother liquor composition in the calcium carbonate whisker production process is (g / L): SO 4 2- 0.9696, Ca 2+ 1.12, Mg 2+ 10.1664 and a small amount of particulate impurities; the ratio of barium chloride to the amount of sulfate in the mother liquor is 0.95:1.

[0037] (2) Add calcium remover to the mother liquor for removing sulfate radicals, stir at a speed of 130r / min, and feed CO 2 , stirring and reacting until the pH value of the mother liquor is 7, stop the ventilation, and obtain the mother liquor from...