Preparation method for low-cost and high-whiteness calcined talcum

A calcined talc, high whiteness technology, applied in the direction of chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of increasing production costs, restricting industry development, occupying land resources, etc., to reduce production costs and strengthen the market Competitiveness and cost reduction effects

Active Publication Date: 2019-01-29
YINGKOU TENGLONG NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the quality and whiteness of calcined talc, it is necessary to add processes such as mineral dressing, magnetic separation and iron removal, and oxygen-enriched calcination. The process is complicated and the production cost is increased; when there is a lot of organic matter in black talc, the calcined waste gas needs to be recycled by environmental protection equipment to meet the emission standards
In addition, the talc resources that can be used as ceramic raw materials are nearly exhausted, resulting in higher prices for high-whiteness calcined talc, which increases the production cost of advanced ceramics, reduces prod

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Prepare materials by weight: 45 parts of magnesite, 40 parts of silica, 5 parts of talc; the mass fraction of MgO in magnesite is 39%, SiO 2 The mass fraction is 11%; SiO in silica 2 The mass fraction that accounts for is 93%; The mass fraction that MgO accounts for in the talc slag is 31%, and SiO 2 The mass fraction is 57%;

[0032] 2) After mixing the above raw materials, put them into a ball mill for mixing and water milling for 5 hours, and then filter through a plate and frame filter press after reaching 200 mesh, and dry the filtered wet materials through a rotary flash dryer to obtain raw material mixed powder;

[0033] 3) The raw material mixed powder was calcined at 1200°C for 6h, then cooled to 30°C, and calcined talc powder was obtained by crushing, grinding and sieving, and the whiteness of the obtained calcined talc powder was 96.

Embodiment 2

[0035] 1) Prepare materials by weight: 20 parts of magnesite, 60 parts of silica, 7 parts of talc; the mass fraction of MgO in magnesite is 44%, SiO 2 The mass fraction is 5%; SiO in silica 2 The mass fraction is 94%; the mass fraction of MgO in talc is 30%, SiO 2 The mass fraction is 56%;

[0036] 2) After mixing the above raw materials, put them into a ball mill for mixing and water milling for 2 hours, and then filter through a plate and frame filter press after reaching 80 mesh, and dry the filtered wet materials through a rotary flash dryer to obtain raw material mixed powder;

[0037] 3) The raw material mixed powder was calcined at 1400°C for 3.5h, then cooled to 25°C, and calcined talc powder was obtained by crushing, grinding and sieving, and the whiteness of the obtained calcined talc powder was 94.

Embodiment 3

[0039] 1) Prepare materials by weight: 60 parts of magnesite flotation tailings, 25 parts of silica, 15 parts of talc slag; the mass fraction of MgO in magnesite flotation tailings is 38%, SiO 2 The mass fraction is 19%; SiO in silica 2 The mass fraction that accounts for is 98%; The mass fraction that MgO accounts for in the talc slag is 28%, and SiO 2 The mass fraction is 61%;

[0040] 2) Dry grind magnesite or magnesite flotation tailings to 60 mesh, dry grind to 50 mesh silica powder and 1mm~5mm talc / talc slag to make bricks;

[0041] 3) Place the adobe in a tunnel kiln for calcination at 1200°C for 5 hours, then cool to 38°C to obtain calcined talc powder / block, and the whiteness of the obtained calcined talc block is 92.

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Abstract

The invention relates to a preparation method for low-cost and high-whiteness calcined talcum, belonging to the technical field of ceramic raw materials. The preparation method is characterized by comprising the following preparation steps: preparing the following raw materials by weight: 15 to 60 parts of magnesite or magnesite flotation tailings, 15 to 60 parts of silica and 0 to 20 parts of talcum/talcum slag; mixing the raw materials, then carrying out calcination at 1000 DEG C to 1500 DEG C for 1 h to 8 h, and carrying out cooling to 25 DEG C to 40 DEG C so as to obtain calcined talcum powder/blocks. The method provided by the invention prepares a calcined talcum substitute used for ceramics by using the magnesite or the magnesite flotation tailings and the silica as main raw materials, utilizes cheap and low-grade magnesite or the magnesite flotation tailings and the silica and adopts a high-temperature solid-phase reaction process to directly prepare the calcined talcum substitute, and has low cost.

Description

technical field [0001] The invention discloses a method for preparing calcined talc with low cost and high whiteness, belonging to the technical field of ceramic raw materials. Background technique [0002] Talc is a silicate mineral with a layered structure, widely used in papermaking, ceramics, rubber, coatings, paints, cosmetics, refractory equipment, textiles, dyes, foundry and pharmaceuticals and other industrial fields. The world's talc resources are mainly distributed in countries such as the United States, Brazil, China, France, Finland and Russia. China's talc mines are mainly concentrated in five provinces including Liaoning, Shandong, Guangxi, Jiangxi, and Qinghai, and the sum of reserves accounts for 95% of the country's total resources. [0003] The use of talcum powder can be divided into six categories: chemical grade talc powder, ceramic grade talc powder, cosmetic grade talc powder, pharmaceutical and food grade talc powder, papermaking grade talc powder an...

Claims

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Application Information

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IPC IPC(8): C01B33/40
CPCC01B33/40C01P2006/65
Inventor 丛锡桥仲剑初
Owner YINGKOU TENGLONG NEW MATERIALS
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