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Process for preparing nano calcium carbonate

A technology of nano-calcium carbonate and calcium chloride, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., can solve the problem of inability to produce nano-scale calcium carbonate, low utilization rate of carbon dioxide, and unsuitable treatment of electroslag Stone and other problems, to achieve the effect of low cost, small particle size, and eliminate pollution

Inactive Publication Date: 2008-08-06
汤建新 +2
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Problems solved by technology

Patent CN1058005A describes a method for preparing industrial calcium carbonate by electroslag, which needs to be dried and then roasted at high temperature to remove impurities, the process is complicated, energy consumption is large, and economic benefit is low
Patents CN200510020830.1, CN200410093237.5, etc. describe a method for preparing ultrafine calcium carbonate from electroslag, which uses a conventional intermittent bubbling method for carbonization, long carbonization time, low utilization of carbon dioxide, and the above method cannot Nano-sized calcium carbonate
Patents such as CN02114174.6 and CN 02109349.0 describe methods for preparing nano-calcium carbonate, but these methods need calcium carbonate or calcium hydroxide as starting materials, and are not suitable for processing electroslag

Method used

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Embodiment Construction

[0015] specific implementation plan

[0016] Take a certain amount of electroslag slurry that has been vibrating and sieved, add an appropriate amount of water and ammonium chloride to stir and dissolve, control the pH value of the solution ≥ 7, and control [Ca 2+ ]2+ 1.5 times the amount of hydrogen peroxide solution, stirred and reacted for 0.5 hour, and filtered to obtain calcium chloride clear liquid; the above-mentioned calcium chloride clear liquid was filtered through a microporous membrane with a pore size of 20 microns to remove the calcium chloride clear liquid. A small amount of insoluble matter was removed to obtain a purified calcium chloride solution. Add 1.0% (calculated as CaO) of oxalic acid and a mixed solution of dicalcium hydrogen phosphate as a crystal form control agent, and 1.5% (calculated as CaO) of polystyrene-b-polystyrene / maleic anhydride copolymer as a dispersant, After fully stirring and dissolving, pass in carbon dioxide gas until pH = 7.5-8 as ...

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Abstract

The invention relates to a method for preparing high-purity and high-whiteness spherical nanometer calcium carbonate; by using electroslag stone as starting material, after impurity is removed by simple pretreatment process, by adding crystal control agent and polymer surfactant, the high-purity and high-whiteness spherical nanometer calcium carbonate is prepared by a chemical reaction method. Firstly, the electroslag stone is physically and chemically treated; calcium chloride solution is obtained after the impurity is removed,; temperature of carbonization reaction is controlled at 6-18 DEG C; the nanometer calcium carbonate with a grain diameter of 50nm can be prepared by adding the crystal control agent and polymer surfactant of 0.5-5.0 percent; the nanometer calcium carbonate can be applied to fields such as rubber, plastic, papermaking, paint, ink, medicine and daily chemical industry, etc. The method for preparing the high-purity and high-whiteness spherical nanometer calcium carbonate has low cost, high economic efficiency and simple process which can realize industrialization continuous production.

Description

technical field [0001] The invention relates to a new method for preparing nano-calcium carbonate from electroslag, which belongs to the manufacturing method of inorganic salt nano-materials in the field of chemical industry. On the one hand, this method can eliminate the pollution of electroslag to the environment; on the other hand, it can turn waste into treasure, realize the recycling of resources, and obtain huge economic benefits. technical background [0002] Acetylene is produced from calcium carbide, and a large amount of by-product, electroslag, will be produced when polyvinyl chloride is prepared by the gas phase method. According to statistics, there are about 3×10 8 tons of electroslag, currently there is no good method for the treatment of electroslag, it is mainly used in the production of interior wall coatings, cement, waste water treatment, desulfurization agent or light calcium carbonate, etc., the products prepared by these methods are added The value i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82B3/00
Inventor 汤建新张继德凌少青
Owner 汤建新
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