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Method for preparing fibrous light cakium carbonate and reactor

A light calcium carbonate, reactor technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of wide distribution of length and diameter, small size, short residence time, etc.

Active Publication Date: 2008-09-24
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The size distribution of fibrous light calcium produced by the above patents is not uniform, and the distribution of length and diameter is relatively wide. The reason for this situation is that these patents prepare fibrous light calcium. Out of the reactor, the residence time in the reactor varies greatly
If the product is formed early, it stays in the reactor for a long time and has a large size, while if the product is formed late, it has a short residence time in the reactor and a small size, so the length and diameter of the fibrous light calcium present a certain distribution. , poor uniformity

Method used

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  • Method for preparing fibrous light cakium carbonate and reactor

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] Adding Ca(OH) with a weight concentration of 10% in a jacketed reactor of 15 cubic meters 2 3 tons of water slurry, then add 7 tons of water to dilute to Ca(OH) with a weight concentration of 3.0% 2 Slurry, add 900kgMgCl again wherein 2 ·6H 2 O, stir to make it completely dissolve, pass steam into the jacket of the reactor, heat the slurry to 82°C, and two 15 cubic meter reactors alternately feed continuously to the reactor.

[0032] The heated slurry is pumped into a tube reactor with a length of 50 meters and a diameter of 40 cm. The liquid level in the tube reactor is 26 cm, and Ca(OH) 2 The feeding flow rate of the slurry is 100 liters / minute, the area of ​​the wire mesh at the bottom of the reactor is 5 square meters, and the wire mesh is a 200-mesh stainless steel wire mesh.

[0033] CO 2 The mixed gas flow rate is 250 l / min, CO 2 The mixed gas contains 25% CO 2 , the pH of the reactor outlet slurry is 6.9, and the slurry that goes out of the reactor is sent...

Embodiment 2

[0039] Adding Ca(OH) with a weight concentration of 10% in a jacketed reactor of 15 cubic meters 2 3 tons of slurry, then add 7 tons of water to dilute to Ca(OH) with a weight concentration of 3.0% 2 Slurry, add 1200kgMgCl again wherein 2 ·6H 2 O, stir to dissolve completely, pass steam into the reactor jacket, and heat the slurry to 90°C. Two 15 cubic meter reactors take turns to continuously feed the reactor.

[0040] The heated slurry is pumped into a tank reactor with a length of 80 meters and a section of 50×50 cm. The liquid level in the tubular reactor is 40 cm, and Ca(OH) 2 The feeding flow rate of the slurry is 150 liters / minute, the area of ​​the wire mesh at the bottom of the reactor is 8 square meters, and the wire mesh is a 325-mesh stainless steel wire mesh. CO 2 The mixed gas flow rate is 320 l / min, CO 2 The mixed gas contains 22% CO 2 , the reactor outlet slurry pH is 7.0, the slurry out of the reactor is sent to the vacuum drum filter for filtration and...

Embodiment 3

[0046] Adding Ca(OH) with a weight concentration of 10% in a jacketed reactor of 15 cubic meters 2 1 ton of slurry, then add 10 tons of water to dilute to 1.0% Ca(OH) by weight 2 Slurry, add 300kgMgCl again wherein 2 ·6H 2 O, stir to make it dissolve completely, pass steam into the reactor jacket, and heat the slurry to 95°C. Two 15 cubic meter reactors take turns to continuously feed the reactor.

[0047] The heated slurry is pumped into a long 100 meter oval reactor, the major axis of the ellipse is 80cm and the minor axis is 40cm, the liquid level in the oval reactor is 55cm, Ca(OH) 2 The feeding flow rate of the slurry is 210 liters / minute, the area of ​​the wire mesh at the bottom of the reactor is 7.5 square meters, and the wire mesh is 800 mesh stainless steel wire mesh. CO 2 The mixed gas flow rate is 500 l / min, CO 2 The mixed gas contains 24% CO 2 , the reactor outlet slurry pH is 7.0, the slurry out of the reactor is sent to the vacuum drum filter for filtrati...

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Abstract

The present invention discloses process and reactor for preparing fibrous light calcium carbonate. The preparation process includes the following steps: heat the mixture of 1-5 % water slurry of Ca(OH)2 and MgCl26H2O in 2-4 times weight of Ca(OH)2 to 80-95 deg.C, carbonizing reaction of the slurry in a horizontal strip reactor and the introduced CO2 gas through one gas distributing member to carbonize the Ca(OH)2 in the slurry into fibrous calcium carbonate, and filtering and washing the effluent to obtain the fibrous light calcium carbonate. The said process has identical retaining time of Ca(OH)2 slurry inside the reactor and is favorable to the growth of fibrous light calcium carbonate to obtain fibrous light calcium carbonate in homogeneous size distribution.

Description

technical field [0001] The invention relates to a preparation method and device of fibrous light calcium carbonate, in particular to a fibrous light calcium carbonate and a device used for plastic reinforcement and papermaking filler. Background technique [0002] Whiskers are fine single-crystal materials grown under controlled conditions, that is, with a certain aspect ratio (generally greater than 10). The internal structure of the crystal is relatively complete, with fewer internal defects, and its mechanical strength is approximately equal to the theoretical strength of the bond force between atoms. It does not contain crystal defects such as grain boundaries, subgrain boundaries, and voids, so the strength and modulus of whiskers are close to those The theoretical value of a complete crystal material is a new type of composite material reinforcement and toughening agent with excellent mechanical properties. Whiskers with longer length and larger diameter are called fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 施晓旦王彦华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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