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Preparation method of foamed polyethylene filter material

A foamed polyethylene and filter material technology, applied in the direction of filtration separation, separation methods, chemical instruments and methods, etc., can solve problems such as the application of substrates that are not suitable for separation materials, shorten the service life of filter plates, and reduce the recovery rate of concentrates , achieve good chemical inertness, low cost, and improve the recovery rate

Inactive Publication Date: 2015-09-30
步洲(天门)泵业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, silicate porous materials are mainly used as the filter substrate, but some raw ores contain fluorine, which makes the pulp after the flotation process contain hydrofluoric acid, which will directly corrode the silicate filter in the concentrate recovery process. materials, which greatly shorten the service life of the filter plate and reduce the recovery rate of the concentrate. Therefore, the polymer filter plate that is not corroded by hydrofluoric acid is the first choice under this working condition
However, the materials used in the separation membranes that have been maturely used are mainly polysulfone or cellulose acetate, etc., which have high costs and are not suitable for use as a separation material matrix in the mineral processing industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: a kind of preparation method of expanded polyethylene filter material, according to the following steps:

[0029] Step 1, the ratio of raw materials: Weigh 500g of polyethylene, 100g of ethylene-vinyl acetate copolymer, 10g of calcium carbonate, 250g of azodicarbonamide, and 50g of sodium chloride.

[0030] Step 2, with polyethylene, ethylene-vinyl acetate copolymer and calcium carbonate in internal mixer with 180 o C temperature and stirred for 2 hours.

[0031] Step 3, continue to add azodicarbonamide and sodium chloride in the mixture of step 2 gained, in internal mixer with 150 o C temperature and stirred for 0.5 hours to obtain a homogeneously dispersed mixture.

[0032] Step 4, foaming and hot-pressing molding: put the compound obtained by kneading in the internal mixer into a mold for hot-pressing molding, and the hot-pressing temperature is 200 o C, the pressure is 2MPa, and the holding time is 60s.

[0033] Step five, soaking in distilled wate...

Embodiment 2

[0036] Embodiment 2: a kind of preparation method of expanded polyethylene filter material, according to the following steps:

[0037] Step 1, the ratio of raw materials: Weigh 600g of polyethylene, 50g of ethylene-vinyl acetate copolymer, 50g of silicon dioxide, 100g of N,N-dinitrosopentamethylenetetramine, 80g of potassium chloride, poly Ethylene glycol 20g.

[0038] Step 2, with polyethylene, ethylene-vinyl acetate copolymer and calcium carbonate in internal mixer with 200 o C temperature and stirred for 2 hours.

[0039] Step 3, continue to add N,N-dinitrosopentamethylenetetramine, potassium chloride and polyethylene glycol to the mixture obtained in step 2, and mix it with a mixer at 160 o C temperature and stirred for 0.5 hours to obtain a homogeneously dispersed mixture.

[0040] Step 4, foaming and hot-pressing molding: put the compound obtained by kneading in the internal mixer into a mold for hot-pressing molding, and the hot-pressing temperature is 210 o C, the ...

Embodiment 3

[0044] Embodiment 3: a kind of preparation method of expanded polyethylene filter material, according to the following steps:

[0045] Step 1, the ratio of raw materials: Weigh 450g of polyethylene, 150g of ethylene-vinyl acetate copolymer, 50g of montmorillonite, 50g of rectorite, 100g of azodicarbonamide, N,N-dinitrosopenta Methyltetramine 50g, sodium chloride 100g, polyvinylpyrrolidone 50g.

[0046] Step 2, with polyethylene, ethylene-vinyl acetate copolymer, montmorillonite and rectorite in internal mixer with 160 o C temperature and stirred for 2 hours.

[0047] Step 3, continue to add azodicarbonamide, N,N-dinitrosopentamethylenetetramine, sodium chloride and polyvinylpyrrolidone to the mixture obtained in step 2, and mix in a mixer at 130 o C temperature and stirred for 1 hour to obtain a homogeneously dispersed mixture.

[0048] Step 4, foaming and hot-pressing molding: put the compound obtained by kneading in the internal mixer into a mold for hot-pressing molding,...

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PUM

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Abstract

The invention relates to a preparation method of a foamed polyethylene filter material. The foamed polyethylene filter material is composed of the following components in percentage by weight: 30-80% of polyethylene, 4-20% of ethylene-vinyl acetate copolymer, 1-15% of reinforcer, 10-30% of foaming agent and 8-30% of pore-forming agent. The preparation method comprises the following steps: raw material melting and banburying: melting and banburying the components in percentage by weight, and sufficiently stirring uniformly, wherein the banburying temperature is 90-200 DEG C; carrying out foaming and hot pressing, wherein in the hot pressing process, the temperature is 200-260 DEG C, the pressure is 1-5 MPa, and the holding time is 10-60 seconds; and distilled water immersion: repeatedly immersing the foamed and hot-pressed material in distilled water for 1-24 hours to prepare the foamed polyethylene, and repeatedly flushing in high-pressure distilled water. The foamed polyethylene filter material has higher entrapment rate for 200-mesh concentrate, has favorable acid resistance and mechanical wear resistance, and can be used instead of the traditional silicate material in hydrofluoric-acid-containing ore slurry.

Description

technical field [0001] The invention belongs to the field of mining equipment, and particularly relates to an inexpensive filter material with relatively high comprehensive mechanical properties for sewage purification, which can be used as a filter plate for direct ore filtration, and can also be used as a support layer for nanofiltration membranes or reverse osmosis membranes, specifically The invention relates to a preparation method of a foamed polyethylene filter material. Background technique [0002] In the mining industry, after the beneficiation process, the concentrate in the pulp is mainly extracted by filtration. At present, silicate porous materials are mainly used as the filter substrate, but some raw ores contain fluorine, which makes the pulp after the flotation process contain hydrofluoric acid, which will directly corrode the silicate filter in the concentrate recovery process. materials, which greatly shorten the service life of the filter plate and red...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/08C08J9/10C08J9/26B01D39/16
CPCC08L23/06B01D39/1676C08J9/103C08J9/107C08J9/26C08J2203/04C08J2203/18C08J2323/06C08J2323/08C08K2201/014C08L2207/066
Inventor 陈喆张勇吴江渝付秋明邓泉荣毛样武
Owner 步洲(天门)泵业有限公司