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Method of utilizing electric furnace slag to prepare spherical vaterite calcium carbonate centralized in granularity distribution

A particle size distribution and electric furnace slag technology, applied in calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problems of calcium carbonate's unstable performance and low application value, and achieve added value High, high application value, stable performance

Inactive Publication Date: 2017-09-05
YANGTZE NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the prepared calcium carbonate has a wide particle size distribution range, various shapes, and different crystal forms of calcium carbonate, which makes the prepared calcium carbonate unstable and has low application value.

Method used

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  • Method of utilizing electric furnace slag to prepare spherical vaterite calcium carbonate centralized in granularity distribution
  • Method of utilizing electric furnace slag to prepare spherical vaterite calcium carbonate centralized in granularity distribution
  • Method of utilizing electric furnace slag to prepare spherical vaterite calcium carbonate centralized in granularity distribution

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Embodiment 1

[0037] A method for preparing spherical vaterite calcium carbonate with concentrated particle size distribution by using electric furnace slag. The concrete steps of described method are:

[0038]Step 1. The pulverized electric furnace slag is mixed and reacted for 150-300 min with a solid-to-liquid ratio of 1Kg: (15-25) L and 2-4 mol / L ammonium chloride solution, and the stirring speed of the reaction is 150-300 rpm. The reaction is completed at a temperature of 50-60° C., and filtered after the reaction is completed to obtain a leaching solution containing calcium ions.

[0039] Step 2. Cool the leaching solution containing calcium ions to 15-25°C, add a certain amount of ammonia water to the leaching solution containing calcium ions, place it in a microwave device, and then pass pure carbon dioxide gas to react 100-200min, the reaction is completed under the conditions that the stirring speed is 150-350rpm, the ventilation rate is 200-350ml / min, and the microwave output po...

Embodiment 2

[0041] Step 1. Mix the pulverized electric furnace slag with a solid-to-liquid ratio of 1Kg: (20-30) L and 1.5-3.5 mol / L ammonium chloride solution for 60-180 minutes, and the reaction is carried out at a stirring speed of 200-400 rpm , the reaction temperature is completed under the condition of 45-60° C., and the reaction is filtered after completion to obtain the leaching solution containing calcium ions.

[0042] Step 2, cooling the leaching solution containing calcium ions to 10-20°C, adding a certain amount of ammonia water to the cooling leaching solution containing calcium ions, and then introducing pure carbon dioxide gas to react for 50-180 minutes, and the reaction was stirred The speed is 180-320rpm, the air flow is 180-320ml / min, and the microwave output power is 500-800 watts / liter solution. After the reaction is completed, it is filtered to obtain spherical vaterite calcium carbonate with concentrated particle size distribution.

Embodiment 3

[0044] Step 1. The pulverized electric furnace slag is mixed with 1Kg:(25-35)L of ammonium chloride solution of 1-3mol / L according to the solid-to-liquid ratio for 30-150min, and the stirring speed of the reaction is 300-500rpm, The reaction is completed under the condition of 40-55° C., and the reaction is filtered after completion to obtain calcium ion-containing leaching solution.

[0045] Step 2, cooling the leaching solution containing calcium ions to 10-20°C, adding a certain amount of ammonia water to the cooling leaching solution containing calcium ions, and then introducing pure carbon dioxide gas to react for 20-150 minutes, and the reaction was stirred The speed is 150-300rpm, the ventilation rate is 150-300ml / min, and the microwave output power is 450-750 watts / liter solution. After the reaction is completed, it is filtered to obtain spherical vaterite calcium carbonate with concentrated particle size distribution.

[0046] Compared with the prior art, the present ...

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Abstract

The invention discloses a method of utilizing electric furnace slag to prepare spherical vaterite calcium carbonate centralized in granularity distribution. The method includes steps: mixing the electric furnace slag with ammonium chloride solution for reaction to obtain leachate containing calcium ions; feeding carbon dioxide gas into the leachate for reaction to generate calcium carbonate granules. The method is characterized by adding ammonia water into the leachate and feeding carbon dioxide in a microwave radiation state for reaction at the same time. Calcium carbonate prepared by the method has a centralized granularity distribution range and is spherical, stable in performance and high in added value, and crystal form of calcium carbonate has the characteristics of vaterite.

Description

technical field [0001] The invention belongs to the technical field of electric furnace slag recovery and utilization. In particular, it relates to a method for preparing spherical vaterite calcium carbonate with concentrated particle size distribution by using electric furnace slag. Background technique [0002] As my country's steel output continues to increase in the world's proportion, my country's production of electric furnace steel using scrap steel is gradually increasing, and its by-product electric furnace steel slag will also gradually increase. However, my country has not yet developed an ideal electric furnace slag treatment technology, and its utilization rate is only about 10%, which is much lower than that of converter steel slag. Most of the electric furnace slag is actually extensively discharged, and a large amount of waste slag is stored and processed, which not only occupies land, Moreover, there are potential hazards to water bodies or soil. At the sam...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/182C01P2004/03C01P2004/32C01P2004/51C01P2004/61
Inventor 童志博彭程马国军
Owner YANGTZE NORMAL UNIVERSITY
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