Methods for preparing quicklime from calcium carbide dry residue and producing nano calcium carbonate by adopting quicklime

A nano-calcium carbonate and quicklime technology is applied in the field of calcium carbide slag resource utilization and development to achieve high value-added utilization and solve the problems of land occupation and environmental pollution.

Inactive Publication Date: 2019-10-08
新疆德安环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many ways to utilize calcium carbide slag, each has its advantages and disadvantages. The treatment effect of each method has advantages and disadvantages, which are restricted by the production capacity of calcium carbide method PVC, the discharge of calcium carbide slag, environmental protection standards, surrounding environmental factors and economic benefits.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: the moisture content is 1.5%, and the calcium carbide dry slag that main component is calcium carbonate is ground into powder, washes with clear water, suction filtration, is placed in oven at 110 o C drying. Then put it in the muffle furnace, at 950 o Calcined at C for 2 hours to obtain quicklime with a calcium oxide content of 86.13%. Take 5.0g of the obtained quicklime, add 70ml of water, and dissolve 7.15g of NH 4 Cl was slowly added to the calcium carbide slag solution, at 40 o C, reacted for 60min under the condition of 400r / min, filtered and removed the precipitate to obtain calcium chloride solution, then added 2ml triethanolamine and 50ml0.5mol / L sodium carbonate solution to it, at 20 o C, under the condition of 400r / min, reacted for 30min, suction filtered, after washing with distilled water and absolute ethanol respectively, then the resulting precipitate was placed in an oven, 110 o C drying for 2 hours to obtain calcite-type nano-calcium c...

Embodiment 2

[0016] Embodiment 2: the moisture content is 2.1%, and the calcium carbide dry slag that main component is calcium carbonate is ground into powder, washes with clear water, suction filtration, is placed in oven at 110 o C drying. Then put it in the muffle furnace, at 1000 o Calcined at C for 3 hours to obtain quicklime with a calcium oxide content of 87.24%. Take 5.0g of the obtained quicklime, add 100ml of water, and dissolve 8.24g of NH 4 Cl was slowly added to the calcium carbide slag solution, at 20 o C, under the condition of 300r / min, react for 60min, filter and remove the precipitate, obtain calcium chloride solution, then add 3ml triethanolamine and 50ml0.5mol / L sodium carbonate solution to it, at 40 o C, reacted for 60min under the condition of 400r / min, suction filtered, after washing with distilled water and absolute ethanol respectively, then the resulting precipitate was placed in an oven, 110 o C drying for 2 hours to obtain calcite-type nano-calcium carbonat...

Embodiment 3

[0017] Embodiment 3: the moisture content is 4.7%, and the calcium carbide dry slag of main component is ground into powder, washes with clear water, suction filtration, is placed in oven at 110 o C drying. Then put it in the muffle furnace, at 1100 o Calcined at C for 3 hours to obtain quicklime with a calcium oxide content of 88.68%. Take 5.0g of the obtained quicklime, add 50ml of water, and dissolve 9.02g of NH 4 Cl was slowly added to the calcium carbide slag solution, at 50 o C, reacted for 60min under the condition of 400r / min, filtered to remove the precipitate, obtained calcium chloride solution, then added 5ml triethanolamine and 25ml1.0mol / L sodium carbonate solution to it, at 60 o C, under the condition of 400r / min, reacted for 30min, suction filtered, after washing with distilled water and absolute ethanol respectively, then the resulting precipitate was placed in an oven, 110 o C drying for 2 hours to obtain calcite-type nano-calcium carbonate with a purity o...

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PUM

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Abstract

The invention discloses a method for preparing quicklime from calcium carbide dry residue and producing nano calcium carbonate by adopting the quicklime. The method includes the following steps that the quicklime is prepared by washing, drying and calcining of the calcium carbide dry residue, calcite type nano calcium carbonate is prepared by digestion, leaching and carbonization, the purity is more than 99%, the problem of disposal of the calcium carbide dry residue is solved, and the high added value utilization of the calcium carbide dry residue is realized, so that the sustainable development of the PVC industry is realized.

Description

technical field [0001] The invention belongs to the field of resource utilization and development of calcium carbide slag, and in particular relates to a process route in which calcium carbide dry slag mainly composed of calcium carbonate is washed, dried, and calcined to obtain quicklime, and then digested, leached, and carbonized to obtain nanometer calcium carbonate. Background technique [0002] Carbide slag is a by-product of the production of vinyl chloride by the calcium carbide acetylene process. The slag liquid is strongly alkaline and has a pH value above 12, which will cause soil and water pollution. Due to its large quantity and high transportation cost, calcium carbide slurry drips and dusts along the way during transportation, causing serious pollution to the environment. [0003] According to calculations, 1 ton of calcium carbide can produce about 10 tons of calcium carbide slurry, that is, about 1.2 tons of calcium carbide dry slag. Our country produces abou...

Claims

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Application Information

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IPC IPC(8): C04B2/10C01F11/18B82Y40/00
CPCB82Y40/00C01F11/18C01P2006/80C04B2/10
Inventor 王璐刘海燕吕友明马莉达闫海军张琳琳王吉德刘广军
Owner 新疆德安环保科技股份有限公司
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