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Method for preparing white carbon black from red mud

A white carbon black and red mud technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of difficult to use on a large scale, complex process of white carbon black, high cost, reduce capital construction investment cost, reduce utilization cost, The effect of reducing management costs

Active Publication Date: 2015-06-24
TIANJIN CEMENT IND DESIGN & RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the research results believe that the effect of pretreatment will be better, and the pretreatment needs to be carried out in some environments with complex processes and harsh reaction conditions. Therefore, the cost of its utilization is high and it is not easy to use it on a large scale.
[0004] Judging from the existing information consulted, at present, the process of preparing white carbon black is relatively complicated and the cost is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of method utilizing red mud to prepare white carbon black, operates according to the following steps:

[0031] 1) Mix the red mud and HCl with a volume ratio of 1:3, and adjust the pH=3.0, and the concentration of HCl is: 21%;

[0032] 2) Put the mixed solution prepared in step 1) into the stirred reactor, and react the hydrochloric acid and the relevant components in the red mud to remove the soluble substances in the red mud and make SiO 2 The main insoluble matter is further enriched; in this embodiment, the reaction conditions are: temperature 93° C., time 90 min.

[0033] After the reaction is completed, let it stand until the temperature in the reaction kettle drops to 20-30°C, and use a suction filter to separate the solid and liquid from the liquid in the kettle to obtain primary liquid and primary slag. The main component of the primary liquid is soluble chloride, and the primary slag is SiO 2 Mainly insoluble matter.

[0034] 3) Wash the primary slag...

Embodiment 2

[0039] A kind of method utilizing red mud to prepare white carbon black, operates according to the following steps:

[0040] 1) Mix the red mud and HCl with a volume ratio of 1:2.5, and adjust the pH=2.0, and the concentration of HCl is: 22%;

[0041] 2) Put the mixed solution prepared in step 1) into the stirred reactor, and react the hydrochloric acid and the relevant components in the red mud to remove the soluble substances in the red mud and make SiO 2 The main insoluble matter is further enriched; in this embodiment, the reaction conditions are: temperature 90° C., time 100 min.

[0042] After the reaction is completed, let it stand until the temperature in the reaction kettle drops to 20-30°C, and use a suction filter to separate the solid and liquid from the liquid in the kettle to obtain primary liquid and primary slag. The main component of the primary liquid is soluble chloride, and the primary slag is SiO 2 Mainly insoluble matter.

[0043] 3) Wash the primary s...

Embodiment 3

[0048] A kind of method utilizing red mud to prepare white carbon black, operates according to the following steps:

[0049] 1) Mix the red mud and HCl with a volume ratio of 1:5, and adjust the pH=3.5, and the concentration of HCl is: 19%;

[0050] 2) Put the mixed solution prepared in step 1) into the stirred reactor, and react the hydrochloric acid and the relevant components in the red mud to remove the soluble substances in the red mud and make SiO 2 The main insoluble matter is further enriched; in this embodiment, the reaction conditions are: temperature 97° C., time 70 min.

[0051] After the reaction is completed, let it stand until the temperature in the reaction kettle drops to 20-30°C, and use a suction filter to separate the solid and liquid from the liquid in the kettle to obtain primary liquid and primary slag. The main component of the primary liquid is soluble chloride, and the primary slag is SiO 2 Mainly insoluble matter.

[0052] 3) Wash the primary slag...

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Abstract

The invention discloses a method for preparing white carbon black from red mud, which comprises the following steps: carrying out reaction by using hydrochloric acid and related components (aluminum oxide, ferric oxide and the like) in red mud to remove soluble substances in the red mud, thereby further enriching insoluble substances mainly composed of SiO2; and under the conditions of alkaline hydrolysis, preparing SiO2 into an intermediate product, and finally, carrying out salting-out in a medium to obtain the high-purity white carbon black. The invention fully utilizes useful elements in the industrial residue-red mud, changes waste into valuable substances, prepares the white carbon black product, and effectively reduces the discharge amount of red mud; since the discharged solid residue exists in the form of solid, the piling form can be simplified, thereby lowering the cost for capital outlay; and meanwhile, the technical process is simple and reliable, and can easily implement industrialized production.

Description

technical field [0001] The invention belongs to the technical field of white carbon black preparation methods, in particular to a method for preparing white carbon black from red mud. Background technique [0002] Red mud is the most important solid waste in the aluminum industry, and about 0.8t to 1.6t of red mud is produced for every 1t of alumina produced. At present, the cumulative stockpiles in various parts of our country have reached 200 million tons, and it is estimated that by 2015, the national red mud stockpiles will reach 350 million tons. Due to the high alkalinity of red mud, after a large amount of red mud is stored for a long time, harmful substances will seep into the ground, which will cause alkalization of the land and pollution of the groundwater environment. Since it cannot be used on a large scale, the red mud produced needs to occupy a large area of ​​land for storage, which increases infrastructure costs. Therefore, the comprehensive utilization of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12
Inventor 张珂胡芝娟
Owner TIANJIN CEMENT IND DESIGN & RES INST