A kind of method adopting perlite fine powder to prepare puffed product

A technology for puffed products and perlite, which is applied in the field of preparing puffed products by using fine perlite powder, can solve the problems of high energy consumption, neglect of chemical modification effect of fine perlite powder, low profit margin, etc., and achieves low energy consumption and improved utilization. The effect of high value and profit margin

Active Publication Date: 2017-05-24
宁波荣山新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the above-mentioned perlite fine powder utilization technologies all have defects such as high energy consumption and low profit margins, and the chemical modification effect of perlite fine powder has always been ignored by people.

Method used

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  • A kind of method adopting perlite fine powder to prepare puffed product
  • A kind of method adopting perlite fine powder to prepare puffed product
  • A kind of method adopting perlite fine powder to prepare puffed product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this example, the chemical composition and content of the fine perlite tailings powder used are shown in Table 1-1; the selected expanded perlite fine powder is produced during the expansion of perlite from the same origin, so the two The chemical composition is basically similar, except that H 2 The O content is slightly different. Soda water glass used, modulus m=3.29, silicon dioxide (SiO 2 ) content is 26.5%, sodium oxide (Na 2 O) content was 8.3%. The raw materials required in this example were not subjected to any optimization processing before the test.

[0042] Table 1-1 Chemical composition and content of perlite tailings fine powder

[0043] chemical composition SiO 2

Al 2 o 3

FeO CaO MgO K 2 o

Na 2 o

h 2 o

Content (wt%) 69.75 12.20 0.5 0.6 0.14 2.13 3.05 5.5

[0044] By adjusting the addition ratio of perlite fine powder, lightweight aggregates with different foaming temperatures can be ...

Embodiment 2

[0059] In this example, the influence of the holding time on the expansion performance and chemical stability of the puffed product is mainly studied. The weight loss rate is the main indicator of the chemical stability of lightweight aggregates. The test method for the weight loss rate of puffed products is as follows:

[0060] 1. Take an appropriate amount of puffed products and place them in the mill, and grind them for 40 times;

[0061] 2. Weigh about 3g of crushed fine powder (accurate to 4 decimal places), and pour it into a beaker filled with hot water to ensure that there are no suspended particles;

[0062] 3. Place the beaker on a heater at 100°C for 2 hours, then filter (weigh the filter paper in advance), and dry it in an oven at 100°C together with the filter paper until constant weight. The expression of weight loss rate is as follows:

[0063]

[0064] In the formula: w is the weight loss rate of the material, expressed as a percentage; G 0 is the origina...

Embodiment 3

[0085] In this example, the influence of the water glass modulus on the performance of the puffed product of the present invention is mainly explored. Choose A and B two kinds of sodium silicate with different modulus, and the parameters of the silicate are shown in Table 3-1:

[0086] Table 3-1 Two kinds of sodium silicate parameters used in this embodiment

[0087]

[0088] Expanded perlite fine powder and perlite tailings fine powder are used as additives respectively, and the solid-liquid ratio is set to 1:3, 1:4, 1:5, 1:6. The test results of puffing performance and physical and chemical properties of puffed products are shown in Table 3-2 to 3-4:

[0089] Table 3-2 Performance test results of puffed products made of water glass A and expanded perlite fine powder

[0090]

[0091] Table 3-3 Performance test results of puffed products made of B water glass and expanded perlite fine powder

[0092]

[0093] Table 3-4 Performance test results of puffed products m...

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Abstract

The invention relates to a method for preparing expanded products by using fine perlite powder. The method comprises the following steps: (1) adding the fine perlite powder into water glass, and mechanically stirring to obtain a sol; (2) molding the sol and drying to obtain an intermediate material; (3) carrying out heat treatment to the intermediate material under the conditions of heat preservation at 400-600 DEG C for 5-30 minutes to obtain the expanded products. According to the method provided by the invention, the fine perlite powder is used as a raw material, the energy consumption is low, the profit margin is large, and the waste tailings can be effectively used, therefore, the method is of great economic and social significance; the expanded products include particle materials and block materials, which are stable in physical and chemical properties, simple in preparation process, and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of reuse of perlite fine powder, in particular to a method for preparing puffed products by using perlite fine powder. Background technique [0002] Perlite, as a kind of water-containing glassy lava, can form granular expanded perlite after crushing and calcining. Due to its light weight, heat insulation, stable physical and chemical properties, expanded perlite has great potential in the field of thermal insulation building materials. Not only that, but expanded perlite has found new uses in other fields, such as energy-saving products, filter aids, absorption and density regulation products, etc. The development of new uses of expanded perlite has greatly increased its application range and dosage. However, some problems brought about by expanded perlite in the production process have gradually become prominent. [0003] Because the ore particles used to produce expanded perlite are generally limited to ore sand a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/06
Inventor 王智宇刘琦屠浩驰王小山阮华李陆宝
Owner 宁波荣山新型材料有限公司
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