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Preparation method of aragonite type white mud calcium carbonate

A calcium carbonate and aragonite-type technology, applied in calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve problems such as high control requirements and affecting alkali recovery efficiency, and achieve adaptability Strong, improve the quality and application performance, the effect of high crystal phase purity

Inactive Publication Date: 2015-01-28
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] From the existing methods of producing white mud calcium carbonate with a certain crystal form, a prominent problem is that the production process control requirements are high, which seriously affects the alkali recovery efficiency

Method used

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  • Preparation method of aragonite type white mud calcium carbonate
  • Preparation method of aragonite type white mud calcium carbonate
  • Preparation method of aragonite type white mud calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) In a 2.0L reaction vessel, add 400mL of purified green liquid with a concentration of 70g / L, calculated as NaOH, then add 1.65g of disodium hydrogen phosphate, and add 135.9g of slaked lime at a time under the condition of stirring, the purity of slaked lime It is 89.8%, that is, the effective calcium hydroxide content is 89.8%. The reaction temperature was controlled at 80° C., and a crystal nucleus solution was formed after 30 minutes of reaction.

[0022] 2) In the crystal nucleus solution, continuously add 1100mL of purified green liquor with a concentration of 124.5g / L. Calculated by NaOH, the green liquor addition rate is 0.15mL / min / g calcium hydroxide, the reaction temperature is 80°C, and the green liquor is added After the heat preservation is finished, it is kept warm for 30 minutes. After the heat preservation is finished, the aragonite type white mud calcium carbonate is obtained through filtration and washing treatment, and water is added to make aragoni...

Embodiment 2

[0025] 1) In a 2.0L reaction vessel, add 400mL of purified green liquor with a concentration of 70g / L, calculated as NaOH, then add 1.65g of disodium hydrogen phosphate, and add 146.06g of slaked lime at a time under the condition of stirring, the purity of slaked lime It is 83.55%, that is, the effective calcium hydroxide content is 83.55%. The reaction temperature was controlled at 80° C., and a crystal nucleus solution was formed after 30 minutes of reaction.

[0026] 2) In the crystal nucleus solution, continuously add 1100mL of purified green liquor with a concentration of 124.5g / L, calculated as NaOH, the green liquor addition rate is 0.16mL / min / g calcium hydroxide, the reaction temperature is 80°C, and the green liquor is added After the heat preservation is finished, it is kept warm for 30 minutes. After the heat preservation is finished, the aragonite type white mud calcium carbonate is obtained through filtration and washing treatment, and water is added to make arag...

Embodiment 3

[0029] 1) In a 2.0L reaction vessel, add 400mL of purified green liquid with a concentration of 100g / L, calculated as NaOH, then add 1.65g of disodium hydrogen phosphate, and add 135.9g of slaked lime at a time under the condition of stirring, the purity of slaked lime It is 89.8%, that is, the effective calcium hydroxide content is 89.8%. The reaction temperature was controlled at 80° C., and a crystal nucleus solution was formed after 30 minutes of reaction.

[0030] 2) In the crystal nucleus solution, continuously add 1100mL of purified green liquor with a concentration of 113.6g / L. Calculated by NaOH, the green liquor addition rate is 0.15mL / min / g calcium hydroxide, the reaction temperature is 80°C, and the green liquor is added After the heat preservation is finished, it is kept warm for 30 minutes. After the heat preservation is finished, the aragonite type white mud calcium carbonate is obtained through filtration and washing treatment, and water is added to make aragon...

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Abstract

The invention belongs to the recovery utilization of solid waste-alkali recovery white mud in paper-making industry and in particular relates to a preparation method of aragonite type white mud calcium carbonate. The existing method for preparing white mud calcium carbonate with certain crystal form has the prominent problems that the preparation process control requirement is high and the alkali recovery efficiency is seriously influenced. Quicklime or hydrated lime and a part of purified green liquid are reacted at 60-100 DEG C to form a crystal nucleus solution, and then the crystal nucleus solution is reacted with the remained purified green liquid at 60-100 DEG C for 30-120min, the temperature is preserved for 30min, then filtering and washing are carried out to obtain the aragonite type white mud calcium carbonate. The filling performance of the prepared white mud calcium carbonate can be improved, and no obvious influence on the existing production process control and the alkali recovery efficiency is caused.

Description

technical field [0001] The invention belongs to the recycling and utilization of alkali-recovered lime mud, which is a solid waste in the papermaking industry, and specifically relates to a preparation method of aragonite-type white mud calcium carbonate. Background technique [0002] In the traditional pulping soda recovery process, the digestion and causticization are carried out at the same time, and there is no way to accurately control the digestion and causticization process, so it is impossible to obtain calcium carbonate with a certain crystal form, particle shape, and narrow particle size distribution. The white mud calcium carbonate will be difficult to meet the needs of paper filling. [0003] Invention patent 02104836.3 improves the key technology of the causticizing process in the traditional alkali recovery process. In the first step of causticizing, the lime emulsion and the purified green liquor are causticized at 0-70°C and then solid-liquid separation is ca...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/181C01P2002/72C01P2004/03
Inventor 苏艳群刘金刚孟远行杨扬
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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