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Method for manufacturing low-grade and high-quality liquid caustic soda and top grade calcium carbonate

A calcium carbonate, high-quality technology, applied in the direction of calcium carbonate/strontium/barium, alkali metal hydroxide, solid waste removal, etc., can solve the problems of low yield, high production cost, three wastes discharge, etc., to reduce production cost , increase productivity, and control the effect of three wastes discharge

Inactive Publication Date: 2010-02-24
王嘉兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the production cost is high, the yield is low, and there are three wastes.

Method used

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  • Method for manufacturing low-grade and high-quality liquid caustic soda and top grade calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment one: the calcium carbide slag of 600kg is adjusted with water and is made into emulsion after purification and is reduced to calcium hydroxide and the soda ash that dissolves again by the mass ratio of pure substance: 1: 1.43 ratio drops in causticizing kettle (4), The chemical reaction is carried out under gentle stirring, the reaction temperature is controlled at 40-50 degrees, and the mixed liquid of sodium hydroxide and calcium carbonate is obtained after 3 hours of causticizing reaction. Obtain sodium hydroxide dilute solution and calcium carbonate wet product after centrifugation (5) washing and separating afterward, sodium hydroxide dilute solution obtains 25% high-quality liquid caustic soda sodium hydroxide (1438.89kg) through underpressure distillation (6) and enters storage Groove; Calcium carbonate is through drying (8), pulverizes (9), and packing becomes finished calcium carbonate (809.44kg) in the finished product room.

Embodiment 2

[0015] Embodiment two: the calcium carbide slag of 600kg is modulated into emulsion and is purified and reduced to calcium hydroxide and soda ash according to the mass ratio of pure substance: the ratio of 1: 1.23 is dropped in the causticizing kettle, and the reaction temperature is controlled at 45 degrees, After 2 hours of causticizing reaction, a mixed liquid of sodium hydroxide and calcium carbonate was obtained. Obtain dilute sodium hydroxide solution and calcium carbonate wet product after centrifugation washing and leaching separation, dilute sodium hydroxide solution obtains 25% high-quality liquid caustic soda sodium hydroxide (1237.73kg) through decompression distillation; Calcium carbonate is through drying, pulverizing , packaged to become finished calcium carbonate (696.22kg).

Embodiment 3

[0016] Embodiment three: the calcium carbide slag of 600kg is modulated into the emulsion and is purified and reduced to calcium hydroxide and soda ash according to the mass ratio of pure substance: 1: 1.63 ratio is dropped in the causticizing kettle, and the reaction temperature is controlled at 50 degrees, After 5 hours of causticizing reaction, a mixed liquid of sodium hydroxide and calcium carbonate was obtained. Obtain sodium hydroxide dilute solution and calcium carbonate wet product after centrifugation washing and leaching separation, sodium hydroxide dilute solution obtains 25% high-quality liquid caustic soda sodium hydroxide (1153.15kg) through vacuum distillation; Calcium carbonate is through drying, pulverizing , packaged to become finished calcium carbonate (810.82kg).

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Abstract

The invention discloses a method for manufacturing low-grade and high-quality liquid caustic soda and top grade calcium carbonate. The main technical scheme is as follows: carrying out chemical reaction on carbide slag and sodium carbonate in a certain proportion to generate the mixed liquor of sodium hydroxide and calcium carbonate; centrifuging the mixed liquor to obtain sodium hydroxide dilutesolution; and directly distilling the sodium hydroxide dilute solution to obtain high-quality liquid caustic soda sodium hydroxide; and carrying out washing, drying, crashing and packaging on filter cake to obtain calcium carbonate. The method of the invention effectively reduces production cost of high-quality liquid caustic soda sodium hydroxide, improves productivity of sodium hydroxide by washing and recovering, and simultaneously governs three wastes discharge to turn into products.

Description

Technical field: [0001] The invention relates to the technical field of treatment and utilization of chemical wastes, in particular to a method for manufacturing low-grade high-quality liquid caustic soda and high-grade calcium carbonate. technical background: [0002] At present, besides the ionic membrane method, the method of producing sodium hydroxide is the causticization method, which is mainly produced by using slaked lime and soda ash to carry out causticization reaction under certain conditions. The disadvantage of this method is that the production cost is high, the yield is low, and the three wastes are discharged. On the basis of the causticization method, the present invention uses chemical waste calcium carbide slag to replace slaked lime to greatly reduce the cost, and utilizes the waste residue discharged after causticization, and not only recovers the lye through washing, improves the yield, but also produces Ordinary calcium carbonate products come, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D1/04C01F11/18B09B3/00
Inventor 王嘉兴
Owner 王嘉兴