Method for preparing micro-fine and ultra-fine calcium carbonate of different crystal forms from carbide slag

A technology of ultra-fine calcium carbonate and carbide slag, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems that the utilization rate is less than 30%, increase the cost of preparing calcium carbonate, etc., achieve improved utilization rate, simple method, and reduce energy consumption Effect

Inactive Publication Date: 2008-09-17
GUIZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country consumes about 15 million tons of calcium carbide each year. Calculated by calculating 1.2 tons of waste residue per ton of calcium carbide consumed, the annual calcium carbide slag produced reaches 18 million tons, and its utilization rate is less than 30%.
However, the above only introduces the method of preparing single crystal fine or ultrafine calcium carbonate by utilizing calcium carbide slag.
Moreover, the preparation method adopts the pretreatment method of calcium carbide slag washing, drying or calcination, thereby increasing the cost of preparing calcium carbonate

Method used

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  • Method for preparing micro-fine and ultra-fine calcium carbonate of different crystal forms from carbide slag
  • Method for preparing micro-fine and ultra-fine calcium carbonate of different crystal forms from carbide slag
  • Method for preparing micro-fine and ultra-fine calcium carbonate of different crystal forms from carbide slag

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: Prepare the slurry according to the ratio of calcium carbide slag: water (mass ratio) = 1: 20, under the effect of magnetic stirring, add 5 mol / L of HCl dropwise, make the pH value of the solution reach about 8, leave standstill, filter Add sodium dodecylbenzenesulfonate in the filtrate afterwards, the addition of controlling sodium dodecylbenzenesulfonate is to generate 1% of calcium carbonate quality, then drip the carbonic acid of 0.08mol / L with the speed of 19mL / min The sodium solution was added to the filtrate until the reaction reached the end point. Simultaneously, during the reaction process, the temperature was controlled at 5° C., and the product was analyzed by a scanning electron microscope after filtering and drying to obtain calcite-type calcium carbonate.

Embodiment 2

[0029] Embodiment 2: Prepare the slurry according to the ratio of calcium carbide slag: water (mass ratio) = 1: 20, under the effect of magnetic stirring, add 5 mol / L of HCl dropwise, make the pH value of the solution reach about 8, leave standstill, filter Add sodium dodecylbenzenesulfonate in the filtrate afterwards, control the add-on of sodium dodecylbenzenesulfonate to be 1% of calcium carbonate quality after generation, then drip the 0.08mol / L with the speed of 19mL / min Sodium carbonate solution was added to the filtrate until the reaction reached the end point. At the same time, the temperature was controlled at 12° C. during the reaction, and the product was analyzed by a scanning electron microscope after filtration and drying to obtain vaterite-type calcium carbonate.

Embodiment 3

[0030] Embodiment 3: Prepare the slurry according to the ratio of calcium carbide slag: water (mass ratio) = 1: 20, under the effect of magnetic stirring, add 5 mol / L of HCl dropwise, make the pH value of the solution reach about 8, leave standstill, filter Add sodium dodecylbenzenesulfonate in the filtrate afterwards, the addition of controlling sodium dodecylbenzenesulfonate is to generate 1% of calcium carbonate quality, then drip the carbonic acid of 0.08mol / L with the speed of 19mL / min The sodium solution was added to the filtrate until the reaction reached the end point. At the same time, the temperature was controlled at 80° C. during the reaction process. After filtering and drying, the product was analyzed with a scanning electron microscope to obtain aragonite-type calcium carbonate.

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Abstract

The invention discloses a preparation method of using carbide slag to produce different micro-and ultra-fine calcium carbonate of various crystal forms, belonging to the calcium carbonate. The method comprises four steps: the first step is the pretreatment of the carbide slag; the second step is the preparation of the calcium chloride solution; the third step is the metathesis reaction for the preparation of micro-and ultra-fine calcium carbonate; the fourth step is to filter and dry. The preparation method has the advantages that (1) the problem of environmental pollution brought by the emission of the carbide slag is solved; (2) since NH4C is not used for the preparation of calcium carbonate, the problem of environmental pollution caused by the NH3 is solved; (3) using HCI to react with carbide slag makes Ca(OH)2 in the carbide slag and CaCO3 generated after the carbonation of carbide slag by air both transfer into CaCl2, improving the recovery rate of the carbide slag; (4) adopting the method of mixing directly the carbide slag and water and preparing the mixture into slurry, instead of traditional drying or high-temperature calcinations pretreatment, reduces the energy consumption in the pretreatment of the carbide slag. The preparation method is suitable for the enterprises using large amount of calcium carbide, in particular to the chloral-alkali enterprises with the PVC production line.

Description

technical field [0001] The present invention is related to calcium carbonate, specifically, it uses calcium carbide slag as raw material and adopts double decomposition method to prepare fine and ultrafine calcium carbonate with different crystal forms. Background technique [0002] Carbide slag is the alkaline waste produced by the reaction of calcium carbide and water to produce acetylene, and its main component is calcium hydroxide. At present, my country consumes about 15 million tons of calcium carbide each year. Calculated by calculating 1.2 tons of waste residue per ton of calcium carbide consumed, the annual production of calcium carbide slag reaches 18 million tons, and its utilization rate is less than 30%. Carbide slag accumulates in large quantities, which not only occupies land but also causes secondary pollution. Therefore, the resource utilization of carbide slag is imminent. [0003] At present, calcium carbide slag has been developed to prepare highly acti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 曹建新杨林偰南杰王杰高传平周强武
Owner GUIZHOU UNIV
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