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A kind of Bayer method red mud improver and using method thereof

A Bayer process red mud and modifier technology, applied in the environmental field, can solve the problems of high cost, difficult to popularize and use on a large scale, and many modifiers, etc., and achieve the effects of low cost, large-scale application, and short improvement cycle.

Active Publication Date: 2020-10-16
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, more modifiers are required for matrix improvement, and the cost is higher, so it is not easy to be popularized and used on a large scale.

Method used

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  • A kind of Bayer method red mud improver and using method thereof
  • A kind of Bayer method red mud improver and using method thereof
  • A kind of Bayer method red mud improver and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 5 g of glucose, 3 g of yeast extract, 10 g of starch and 5 g of calcium dihydrogen phosphate, add 1000 g of distilled water and mix to form an aqueous solution to obtain a liquid modifier. The Bayer process red mud, which is dried, ground, and passed through an 18-mesh sieve, is mixed with the liquid modifier in a ratio of 1:1 according to w:v, and then allowed to stand at 30°C for 3 days to form a Bayer process red mud solution.

[0030] After drying, the bagasse, crushed and passed through an 18-mesh sieve, is added to the Bayer process red mud solution in step 1, and allowed to stand at 30°C for 4 days to obtain an improved Bayer process red mud. The mass ratio of bagasse to Bayer process red mud is 1:18. Then the modified Bayer process red mud was dried and ground at room temperature, and the pH value was measured. The results showed that the pH value of the modified Bayer process red mud was 1.3 units lower than that of the pre-modified Bayer process red mud.

Embodiment 2

[0032] Take 5 g of glucose, 3 g of yeast extract, 20 g of starch and 10 g of calcium dihydrogen phosphate, add 1000 g of distilled water and mix to form an aqueous solution to obtain a liquid modifier. The Bayer process red mud which has been dried, ground and passed through an 18-mesh sieve is mixed with the liquid modifier in a ratio of 1:1 according to w:v, and then allowed to stand at 30°C for 4 days to form a Bayer process red mud solution.

[0033] After drying, the corn stalks crushed and passed through an 18-mesh sieve are added to the Bayer process red mud solution in step 1, and allowed to stand at 30°C for 3 days to obtain an improved Bayer process red mud. The mass ratio of corn stover to Bayer process red mud is 1:13. Then, the modified Bayer process red mud was ground and dried in the shade at room temperature, and the pH value was measured. The results showed that the pH value of the modified Bayer process red mud was lower by 1.7 units than that of the pre-modifie...

Embodiment 3

[0035] Take 10 g of glucose, 3 g of yeast extract, 10 g of starch and 5 g of calcium dihydrogen phosphate, add 1000 g of distilled water and mix to form an aqueous solution to obtain a liquid modifier. The Bayer process red mud, which is dried, ground, and passed through an 18 mesh sieve, is mixed with the liquid modifier in a ratio of 1:1.5 according to w:v, and then allowed to stand at 30° C. for 5 days to form a Bayer process red mud solution.

[0036] The wheat straw, which has been pulverized and passed through an 18-mesh sieve after drying, is added to the Bayer process red mud solution in step 1, and allowed to stand at 30° C. for 2 days to obtain an improved Bayer process red mud. The mass ratio of wheat straw to Bayer process red mud is 1:20. Then, the modified Bayer process red mud was ground and dried in the shade at room temperature, and the pH value was measured. The results showed that the pH value of the modified Bayer process red mud was 1.1 units lower than that ...

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Abstract

The invention belongs to the technical field of environments, and particularly relates to a Bayer process red mud improver and a using method thereof. The Bayer process red mud improver is composed ofa liquid improver and a solid improver, the liquid improver is composed of glucose, yeast extract, starch, calcium dihydrogen phosphate and distilled water according to a mass ratio of (5-15):3:(10-20):(5-10):1000, and the solid improver is bagasse and / or plant straws. The invention also provides a using method of the Bayer process red mud improver. The liquid improver and the solid improver areadded to the Bayer process red mud step by step to improve the Bayer process red mud. The improver has the advantages of reduction of the pH value of the Bayer process red mud, improvement of the physical and chemical properties of the Bayer process red mud, no secondary pollution to the Bayer process red mud, realization of environmentally friendly improvement, and good application prospect.

Description

Technical field [0001] The invention belongs to the field of environmental technology, and specifically relates to a Bayer process red mud improver and a method of use thereof. Background technique [0002] Red mud is a highly alkaline solid waste discharged during the production process of alumina enterprises. Generally, 1 to 2 tons of red mud are incidentally produced for every 1 ton of alumina produced. The red mud has strong alkalinity and high salt content, making comprehensive utilization difficult. A large number of red mud piles exist in red mud storage yards, which affects the ecological environment. China is one of the largest alumina producers in the world. It emits tens of thousands of tons of red mud every year, which not only occupies a lot of land, but also pollutes the environment to varying degrees. The typical chemical property of red mud is that the pH value of its leachate is relatively high. The average pH value of red mud in different storage yards is great...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C09K109/00
CPCC09K17/40C09K2109/00
Inventor 王洋洋阮心玲宋建李方方王帝伟
Owner HENAN UNIVERSITY
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