Dehydrating agent, preparation method and application thereof, and red mud dehydration method

A dehydrating agent, red mud technology, applied in water/sludge/sewage treatment, chemical instruments and methods, sludge treatment, etc., can solve the problems of long time, high energy consumption, poor dehydration effect, etc. Heat, increase evaporation rate, increase the effect of dehydration

Inactive Publication Date: 2021-02-09
广西三秋树环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of high energy consumption, long time consumption or poor dehydration effect in the red mud dehydration method in the prior art, so as to provide a dehydrating agent and its preparation method and application, red mud dehydration method

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  • Dehydrating agent, preparation method and application thereof, and red mud dehydration method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a red mud dehydration method, the specific steps are as follows:

[0035] CaO, MgO, CaC 2 After crushing through a 200-mesh sieve, take the under-sieve according to CaO, MgO, CaC 2 The mass ratio is 2:2:1 and mixed evenly to obtain the dehydrating agent;

[0036]The red mud transported back from the red mud yard is placed in the red mud raw material warehouse (the red mud produced by the Bayer method to produce alumina), and then the red mud is crushed and passed through a 10mm sieve. Re-crushing, the underscreen is sent to the feeding area through the conveyor belt (after testing, the water content of the red mud is 25%), and the dehydrating agent is transported to the feeding area by a vibrating feeder; among them, the mass of the red mud in the feeding area is 100kg, dehydration The mass of the agent is 9kg; the red mud in the feeding area and the dehydrating agent are sent to the screw mixer for mixing evenly, and the mixed material is sen...

Embodiment 2

[0038] This embodiment provides a red mud dehydration method, the specific steps are as follows:

[0039] CaO, MgO, CaC 2 After crushing through a 200-mesh sieve, take the under-sieve according to CaO, MgO, CaC 2 The mass ratio is 2:2:1 and mixed evenly to obtain the dehydrating agent;

[0040] The red mud transported back from the red mud yard is placed in the red mud raw material warehouse (the red mud produced by the Bayer method to produce alumina), and then the red mud is crushed and passed through a 10mm sieve. Re-crushing, the underscreen is sent to the feeding area through the conveyor belt (after testing, the water content of the red mud is 24%), and the dehydrating agent is transported to the feeding area by a vibrating feeder; among them, the mass of the red mud in the feeding area is 100kg, dehydration The quality of the agent is 3kg; the red mud in the feeding area and the dehydrating agent are sent to the screw mixer to mix evenly, and the mixed material is sen...

Embodiment 3

[0042] This embodiment provides a red mud dehydration method, the specific steps are as follows:

[0043] CaO, MgO, CaC 2 After crushing through a 200-mesh sieve, take the under-sieve according to CaO, MgO, CaC 2 The mass ratio is 2:2:1 and mixed evenly to obtain the dehydrating agent;

[0044] The red mud transported back from the red mud yard is placed in the red mud raw material warehouse (the red mud produced by the Bayer method to produce alumina), and then the red mud is crushed and passed through a 10mm sieve. Re-crushing, the underscreen is sent to the feeding area through the conveyor belt (after testing, the water content of the red mud is 24%), and the dehydrating agent is transported to the feeding area by a vibrating feeder; among them, the mass of the red mud in the feeding area is 100kg, dehydration The quality of the agent is 6kg; the red mud in the feeding area and the dehydrating agent are sent to the screw mixer for mixing evenly, and the mixed material is...

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Abstract

The invention provides a dehydrating agent, a preparation method and application thereof, and a red mud dehydration method. The dehydrating agent comprises the following components: calcium carbide, calcium oxide and magnesium oxide; and the particle size of the dehydrating agent is less than 200 meshes. When the dehydrating agent provided by the invention is used for dehydrating red mud, energy consumption is not needed, and firstly, a small part of water is removed by utilizing a chemical reaction of each component in the dehydrating agent and water; then most of water in the red mud is removed through evaporation by utilizing heat released by the chemical reaction and gas acetylene generated by the reaction of calcium carbide and water, so that the method is convenient and quick, and the dehydration effect is high; the red mud with different water contents can be produced by adjusting the addition amount of a dehydrating agent; different water content requirements of the red mud during subsequent resource utilization are met.

Description

technical field [0001] The invention relates to the technical field of resource recovery and utilization in the metallurgical industry, in particular to a dehydrating agent, a preparation method and application thereof, and a red mud dehydration method. Background technique [0002] Red mud is the residue produced when bauxite is leached by strong alkali during the alumina production process. For every ton of alumina produced, 1.0-1.3 tons of red mud are produced. At present, most of the red mud is still disposed of by land stockpiling. The stockpiling of red mud not only wastes secondary resources and takes up a lot of land, but also destroys the surrounding environment of the red mud stockpile, which brings serious environmental problems: because red mud contains fluorine, a large amount of rare earth metals and other rare elements, It will cause pollution of groundwater; the strong alkali characteristics of red mud will affect the growth of plants; after the surface laye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/143C02F11/145C02F11/00C02F103/34
CPCC02F11/143C02F11/145C02F11/00C02F2103/34
Inventor 何绪文顾勇唐乾山秦燚鹤
Owner 广西三秋树环保科技有限公司
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