Preparation method of inorganic filler used in production of wood-plastic material

A technology of wood-plastic materials and inorganic fillers, applied in the field of inorganic fillers, can solve the problems of narrow utilization range and difficulty in the utilization of titanium gypsum, and achieve the effect of improving hardness and strength and reducing raw material costs of wood-plastic products

Inactive Publication Date: 2016-04-06
MAANSHAN HOYO MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a new utilization method of titanium gypsum in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Take 1 liter of titanium gypsum slurry obtained by adding lime to titanium dioxide produced by sulfuric acid method, add a certain amount of calcium carbide slag under stirring to adjust the slurry, measure the pH value with a pH meter, and stop adding when the pH value reaches 8; After filtering, the obtained filter cake is dried and dehydrated at 400°C for 50 minutes to obtain dried titanium gypsum; the dried titanium gypsum is added to the coupling agent according to the mass ratio of 1:0.01, and mixed uniformly; the mixture obtained in the previous step After ball milling and passing through an 800-mesh sieve, modified gypsum powder that can be used as an inorganic filler for wood-plastic materials is obtained.

Embodiment 2

[0013] Example 2: Take 1 liter of titanium gypsum slurry obtained by adding lime to titanium dioxide produced by sulfuric acid method, add a certain amount of calcium carbide slag under stirring to adjust the slurry, measure the pH value with a pH meter, and stop adding when the pH value reaches 8; After filtering, the obtained filter cake was dried and dehydrated at 500°C for 30 minutes to obtain dried titanium gypsum; the dried titanium gypsum was added to the coupling agent according to the mass ratio of 1:0.03, and mixed uniformly; the mixture obtained in the previous step After ball milling and passing through an 800-mesh sieve, modified gypsum powder that can be used as an inorganic filler for wood-plastic materials is obtained.

Embodiment 3

[0014] Example 3: Take 1 liter of titanium gypsum slurry obtained by adding lime to titanium dioxide produced by sulfuric acid method, add a certain amount of calcium carbide slag or red mud to adjust the slurry under stirring conditions, measure the pH value with a pH meter, and stop adding when the pH value reaches 8.5; The slurry is filtered, and the obtained filter cake is dried and dehydrated at 450°C for 40 minutes to obtain the dried titanium gypsum; the dried titanium gypsum is added to the coupling agent according to the mass ratio of 1:0.05, and the mixture is evenly mixed; The obtained mixture is ball milled and passed through an 800-mesh sieve to obtain modified gypsum powder that can be used as an inorganic filler for wood-plastic materials.

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Abstract

The invention provides a preparation method of an inorganic filler used in production of a wood-plastic material by utilizing titanium gypsum, and belongs to the technical field of comprehensive utilization of solid waste. The method is characterized in that an alkali substance is directly added in a sulfuric acid method-based titanium dioxide producing process, so as to convert soluble salts in titanium gypsum slurry into insoluble substances; then the insoluble substances are filtered out; in a high-temperature drying process, not only is dehydration realized, but also hydrotropic substances such as dihydrate gypsum, ferric hydroxide and aluminum hydroxide in titanium gypsum are decomposed into hemihydrate gypsum, ferric oxide and aluminum oxide which are relatively low in hydrophilicity; then surface modification is conducted on the dried titanium gypsum with a coupling agent, so as to improve the lipophilicity of the dried titanium gypsum; finally, ball milling is carried out to obtain modified gypsum powder of which the particle diameter is smaller than 800 meshes. The inorganic filler prepared according to the preparation method has the advantages that the rigidity and the strength of a wood-plastic product adopting the inorganic filler can be improved obviously; the raw material cost of the wood-plastic product is reduced effectively; a new effective way is provided for comprehensive utilization of titanium gypsum.

Description

technical field [0001] The invention belongs to the technical field of solid waste comprehensive utilization. It specifically relates to the use of titanium gypsum to prepare inorganic fillers used in the production of wood-plastic materials. Background technique [0002] Titanium gypsum slag is a by-product obtained after treating acid wastewater with lime in the titanium dioxide industry. Its main component is calcium sulfate dihydrate, with a content of more than 70%. In addition, it also contains a certain proportion of ferric hydroxide, ferrous sulfate and aluminum hydroxide. and other ingredients. In the industry, six tons of titanium gypsum will be produced for every ton of titanium dioxide produced by the sulfuric acid method. In 2011, the total output of titanium dioxide in my country was 1.812 million tons, and the annual emission of titanium gypsum has exceeded 10 million tons. While the stacking of titanium gypsum occupies a large amount of land resources, it ...

Claims

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Application Information

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IPC IPC(8): C08K13/08C08K13/06C08K9/00C08K3/30C08K3/22C08K3/38C08K11/00
CPCC08K13/08C08K3/22C08K3/30C08K3/38C08K9/00C08K11/005C08K13/06C08K2003/2227C08K2003/2272C08K2003/3045
Inventor 俞海云闫勇向贤平
Owner MAANSHAN HOYO MATERIAL TECH CO LTD
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