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Non-asbestos calcium silicate packing for acetylene flask and preparation method thereof

A technology of acetylene bottle and calcium silicate, applied in container filling method, container discharge method, mechanical equipment, etc., can solve the problems of destabilizing slurry gel agent, destabilizing colloidal state, eye and mucous membrane irritation, etc. , to achieve the effect of simplifying the filler formula process, preventing the layering and inhomogeneity of the slurry, and improving the stability of the slurry

Active Publication Date: 2009-12-02
NINGBO MEIKE ACETYLENE CYLINDERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Among them, Al(OH) which acts as a gel 3 Also known as aluminum acid (H 3 AlO 3 ), is an acid-base amphoteric substance, which is colloidal or white precipitated in water, but when it is in a strong alkaline environment (such as NaOH), Al(OH) 3 Will behave acidic, and NaOH occurs: Al(OH) 3 +NaOH→Na[Al(OH) 4 ], which is a hydrated metaaluminate that is easily soluble in water, thereby destroying the stable colloidal state required in the process; while Na[Al(OH) 4 ] will easily precipitate Al(OH) due to the presence of water 3 Precipitation (or jelly), such gel → clarification → gel state occurs repeatedly, destroying the stabilizing effect of the slurry gelling agent
[0011] Aluminum or sodium salt itself is not porous, and the existence of a certain amount of such substances will affect the porosity of calcium silicate filler products to a certain extent; aluminum sulfate is harmful to human health, and it is harmful to eyes and mucous membranes Has a certain stimulating effect; aluminum silicate fiber is an inorganic fiber, although it is not as carcinogenic as chrysotile, but it will produce dust during production and use, which is harmful if inhaled, and it is easy to cause allergies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Measure 50kg of warm water and place it in a digestion container, add 9.4kg of quicklime prepared above for digestion, after the digestion reaction is complete, add 28.8kg of water while stirring, and stir until the lime slurry becomes a paste. Pump the fully digested slaked lime slurry into a mixing agitator with a circulation pump, add 10.6kg of quartz powder with a fineness of 6000 mesh (silicon dioxide content is greater than or equal to 98.5%), stir at a high speed for 30 minutes, and finally add reinforcing fibers Alkali-resistant glass fiber 1.2kg, recirculation and stirring for 3 minutes. Discharge.

[0050] In the vacuum (-0.05MPa) low-frequency vibration state, inject the slurry into the shell of the acetylene bottle, and after filling up, send the acetylene bottle into the autoclave, keep the pressure at 0.4MPa vapor pressure for 5 hours, and then add 0.2MPa / The speed of h is increased to 0.9MPa, and the pressure is maintained at 0.9MPa vapor pressure for 2...

Embodiment 2

[0053] Weigh 150kg of warm water and place it in a digestion container, add 28kg of the above-mentioned quicklime for digestion, after the digestion reaction finishes, add 88kg of water while stirring, and stir until the lime slurry becomes a paste. The fully digested slaked lime slurry is pumped into a mixing agitator with a circulation pump, and the fineness is 6000 mesh and 3000 mesh quartz powder, each 15kg (silicon dioxide content greater than or equal to 98.5%) is added, and the high-speed circulation is stirred for 30 Minutes, finally add 4kg of reinforced fiber alkali-resistant glass fiber, and recirculate and stir for 3 minutes. Discharge.

[0054] In the vacuum (-0.06MPa) low-frequency vibration state, inject the slurry into the shell of the acetylene bottle, after filling up, send the acetylene bottle into the autoclave, keep the pressure at 0.4MPa vapor pressure for 6 hours, and then add 0.2MPa / The speed of h is increased to 0.9MPa, and the pressure is maintained...

Embodiment 3

[0057] Weigh 230kg of warm water and place it in a digestion container, add 39.5kg of quicklime prepared above for digestion. The fully digested slaked lime slurry is pumped into a mixing agitator with a circulating pump, and 2.5 kg of gelling agent carboxymethylcellulose (CMC) is added, and stirred at high speed for 5 minutes while circulating. Then add fineness of 6000 mesh and fineness of 3000 mesh quartz powder (silicon dioxide content greater than or equal to 98.5%) respectively 16.7kg and 22.3kg and diatomaceous earth 16.5kg, add water 166.5kg simultaneously, high-speed circulation stirring 30 minutes, Finally, add 6 kg of reinforcing fiber alkali-resistant glass fiber, and recirculate and stir for 5 minutes. Let stand for 4 hours and discharge.

[0058] In the vacuum (-0.06MPa) low-frequency vibration state, inject the slurry into the shell of the acetylene bottle, after filling up, send the acetylene bottle into the autoclave, keep the pressure at 0.5MPa vapor pressur...

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Abstract

The invention relates to non-asbestos calcium silicate packing for an acetylene flask. The packing is characterized by comprising the following materials in percentage by wet weight: 7 to 10 percent of calcined lime, 0 to 10 percent of diatomite, 4 to 12 percent of quartz powder, 1 to 2 percent of glass fiber, 0 to 1.5 percent of gel, and the balance of water, wherein the calcined lime is calcined for 2 to 4 hours at a temperature of between 1,200 and 1,300 DEG C to produce calcined lime blocks. The preparation method comprises the following steps: mixing the calcined lime blocks with water at room temperature to form slaked lime pulp which is completely digested; then, adding other materials into the pulp under a stirring state to produce even packing paste; and standing the paste for a while to obtain stable packing paste. Compared with the prior non-asbestos calcium silicate packing and the preparation method thereof, the packing and the method have fewer additives in the packing ingredients, reduce cost, have simple preparation process, and produce the packing with excellent performance.

Description

technical field [0001] The invention relates to a porous calcium silicate filler and a preparation method thereof, in particular to an asbestos-free calcium silicate filler for acetylene bottles and a preparation method thereof. Background technique [0002] Because the maximum temperature of the oxyacetylene torch obtained by the full combustion of acetylene and oxygen can reach 3150 ° C, acetylene gas has been widely used in metal welding and cutting processes; however, acetylene gas is unstable, and if it is not properly stabilized , Usually under very low pressure, it is also very easy to decompose and polymerize, and is explosive. Therefore, in order to store acetylene gas safely, according to the solubility characteristics of acetylene, it must be compressed into a solvent and stored in a steel cylinder with porous packing. As an excellent solvent, acetone is adsorbed by the packing in the steel cylinder to dissolve and release acetylene. Its function is to increase t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C11/00C04B26/28C04B14/06C04B14/08C04B14/42F17C13/12
Inventor 王竞雄郑坚陈虎
Owner NINGBO MEIKE ACETYLENE CYLINDERS