Method for increasing content of silicon dioxide in silicon ash and producing white carbon black

A technology of silica and white carbon black, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve problems such as waste of resources, impact on environmental pollution, poor economy, etc., and achieve low production costs , simple process, cost reduction effect

Inactive Publication Date: 2008-03-26
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This non-technical method is simple to implement and easy to industrialize, but it is not economical and it is difficult to reduce the cost of microsilica fume. Some production plants treat the collected dust as waste, which wastes resources on the one hand. , At the same time affect environmental pollution, do not meet environmental protection requirements and other defects

Method used

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  • Method for increasing content of silicon dioxide in silicon ash and producing white carbon black

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for increasing silicon dioxide content and preparing white carbon black from silica fume, carried out according to the following steps:

[0016] a. Carry out dry-type magnetic separation of micro-silicon powder with a silicon dioxide content lower than 85% by weight by adjusting the magnetic field strength. After dry magnetic separation, non-magnetic micro-silicon powder and magnetic micro-silicon powder can be formed. After magnetic separation The non-magnetic micro-silica powder is stored for use;

[0017] b. Pickling the magnetic silica powder with nitric acid, hydrochloric acid or sulfuric acid, the pickling temperature is 20°C-90°C, the pickling time is 1-4 hours, the pH value during pickling is less than 2, and the pickling time is solid The liquid ratio is controlled within the range of 1:2 to 1:6, and washed 1-3 times;

[0018] c. Filter the pickling solution, and dry the filtered solid at a temperature of 95°C to 110°C. After drying, the product is mi...

Embodiment 2

[0028] Using micro-silicon powder with a silicon dioxide content of 78% by weight as raw material, using magnetic separation technology to control magnetic separation parameters, so that 40% of magnetic micro-silicon powder and 60% of non-magnetic micro-silicon powder are selected.

[0029] Add 40% of the selected magnetic silica fume into 15% sulfuric acid aqueous solution according to the solid-to-liquid ratio of 1:5, react at a temperature of 80°C for 3 hours, then filter, wash twice, dry and pulverize, and measure the carbon dioxide The silicon content is 93%.

[0030] According to the ratio of 4:6, the micro-silicon powder with a silicon dioxide content of 93% after pickling and the micro-silicon powder with a silicon dioxide content of 80% after magnetic separation are mixed to obtain a silicon dioxide content of 85.2%. Microsilica fume meets the requirements for use.

[0031] For the production of white carbon black, bleach the silica fume with a silicon dioxide conten...

Embodiment 3

[0033] Using micro-silicon powder with a silicon dioxide content of 80% by weight as raw material, using magnetic separation technology to control magnetic separation parameters, so that 30% of magnetic micro-silicon powder and 70% of non-magnetic micro-silicon powder are selected.

[0034] Add 30% of the selected magnetic silica powder to 20% sulfuric acid aqueous solution according to the solid-to-liquid ratio of 1:4, react at a temperature of 90°C for 4 hours, then filter, wash twice, dry and pulverize, and measure the carbon dioxide The silicon content is 97%.

[0035] According to the ratio of 3:7, the micro-silicon powder with a silicon dioxide content of 97% after pickling and the micro-silicon powder with a silicon dioxide content of 82% after magnetic separation are mixed to obtain a silicon dioxide content of 86.5%. Microsilica fume meets the requirements for use.

[0036] For the production of white carbon black, bleach the micro-silica powder with a silica content...

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Abstract

The present invention discloses method of raising silica content in silica fume and process of producing carbon white. Through dry magnetic dressing on fine silica fume with silica content lower than 85 % to separate magnetic fine silica fume and non-magnetic fine silica fume, pickling treatment on the magnetic fine silica fume, and mixing the dried magnetic fine silica fume and non-magnetic fine silica fume, fine silica fume with silica content higher than 85 % is produced. The magnetic fine silica fume after being pickled may be further bleached, stoved and calcined to obtain carbon white. The present invention provides low cost method of raising silica content in silica fume and new process of producing carbon, and has low production cost, utilization of waste resource and wide application in metal silicon works and ferrosilicon alloy works.

Description

technical field [0001] The invention relates to the comprehensive utilization of micro-silicon fume (silica fume) collected from flue gas produced in the smelting process of metal silicon or ferrosilicon alloy factory, specifically a method for increasing silicon dioxide content and producing white carbon black from silica fume. Background technique [0002] Micro-silica fume (silica fume) is a powder waste collected from the flue gas produced in the smelting process of metal silicon or ferrosilicon alloy factory. Usually, the silica fume (silica fume) produced by metal silicon smelters has a high content of silica and has good application value. However, the microsilica fume (silica fume) produced by the ferrosilicon alloy factory has a low silica content, and sometimes it cannot meet the technical requirements of the microsilica fume used in high performance concrete abroad, that is, the silica content in the microsilica fume is lower than 85%, which greatly limits the ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B14/04C04B20/00
CPCC04B18/146Y02W30/91C04B20/02
Inventor 赵鹏奚松林刘卫云陈剑宁
Owner CHANGAN UNIV
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