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Method for extracting magnesium hydroxide by using boric sludge and treating dye wastewater

A dye wastewater, magnesium hydroxide technology, applied in magnesium hydroxide, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of farmland pollution, land occupation, environmental pollution in boride production areas, etc. The effect of preventing pollution

Inactive Publication Date: 2012-05-30
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of untreated boron mud is piled up like a mountain, which not only occupies land, but also is discharged in the open air, causing serious environmental pollution in the boride production area. Because the boron mud is alkaline, it also causes serious pollution to the surrounding cultivated land

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The method for extracting magnesium hydroxide and treating dye wastewater by using boron mud comprises the following steps:

[0026] (1) Calcinate the mixture of boron mud and industrial concentrated sulfuric acid with a mass ratio of 1:1 in a high-temperature furnace for 1 hour at a temperature of 200°C. After taking it out, add water to dissolve, heat, and filter to obtain a mother liquor; the concentration of industrial concentrated sulfuric acid is 98%;

[0027] (2) Filtrate the mother liquor while it is hot to remove Ca in the mother liquor 2+ ,spare;

[0028] (3) Remove Ca at 50°C 2+ Add the NaOH solution of 1mol / L in the mother liquor, mother liquor is adjusted to pH=9.0, filter then, remove impurity, obtain magnesium semen;

[0029] (4) Add 1 mol / L NaOH solution to the magnesium semen, adjust the pH of the magnesium semen to 12.0, then filter, wash, and dry the obtained substance at a constant temperature to obtain the magnesium hydroxide product;

[0030] (...

Embodiment 2

[0032] The method for extracting magnesium hydroxide and treating dye wastewater by using boron mud comprises the following steps:

[0033] (1) Calcinate the mixture of boron mud and industrial concentrated sulfuric acid with a mass ratio of 3:1 in a high-temperature furnace for 3 hours at a calcination temperature of 400°C. After taking it out, add water to dissolve, heat, and filter to obtain a mother liquor; the concentration of industrial concentrated sulfuric acid is 98%;

[0034] (2) Filtrate the mother liquor while it is hot to remove Ca in the mother liquor 2+ ,spare;

[0035] (3) Remove Ca at 40°C 2+ The NaOH solution of 2mol / L is added in the mother liquor of the mother liquor, and mother liquor is adjusted to pH=9.0, filters then, removes impurity, obtains magnesium semen;

[0036] (4) Add 2 mol / L NaOH solution to the magnesium semen to adjust the pH of the magnesium semen to 12.0, then filter, wash, and dry the resulting substance at a constant temperature to ob...

Embodiment 3

[0039] The method for extracting magnesium hydroxide and treating dye wastewater by using boron mud comprises the following steps:

[0040] (1) Calcinate the mixture of boron mud and industrial concentrated sulfuric acid with a mass ratio of 2:1 in a high-temperature furnace for 2 hours at a calcination temperature of 300°C. After taking it out, add water to dissolve, heat, and filter to obtain a mother liquor; the concentration of industrial concentrated sulfuric acid is 98%;

[0041] (2) Filtrate the mother liquor while it is hot to remove Ca in the mother liquor 2+ ,spare;

[0042] (3) Remove Ca at 90°C 2+ Add the NaOH solution of 1.5mol / L in the mother liquor of the mother liquor, the mother liquor is adjusted to pH=9.0, filter then, remove impurity, obtain magnesium semen;

[0043] (4) Add 1.5 mol / L NaOH solution to the magnesium semen to adjust the pH of the magnesium semen to 12.0, then filter, wash, and dry the obtained substance at a constant temperature to obtain ...

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Abstract

The invention discloses a method for extracting magnesium hydroxide by using boric sludge and treating dye wastewater, which comprises the following steps of: performing calcination, dissolution, heating and filtration on the boric sludge and industrial sulfuric acid, removing Ca2+, and adding NaOH solution to obtain refined magnesium solution; adding NaOH solution, and then filtering, washing and drying to obtain a magnesium hydroxide product; and putting the residual boric sludge dreg into the dye wastewater, stirring and settling. The method recycles a large quantity of magnesium resourcesin the boric sludge, changes waste into valuable, and modifies the boric sludge dreg for treating the dye wastewater so as to realize recycling comprehensive utilization of the boric sludge and radically avoid the influence of secondary pollution of the boric sludge on the environment.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of boron sludge, in particular to the comprehensive utilization of boron sludge. Background technique [0002] Boron mud is the industrial waste slag discharged after the production of borax by using boron magnesium (iron) ore. Boron mud is light red in color, fine in particle size and sandy in shape, and its main components are Mg and SiO 2 , whose typical composition is MgO, CO 2 : 29-31%, SiO 2 : 18-20%, B 2 o 3 : 2-5%, Fe 2 o 3 : 3.3-4.6%, CaO: 15-2%, Al 2 o 3 : 2-2.5%. [0003] In my country, except for high-grade boron ore in Qinghai, Tibet and other places, most enterprises that process borax use low-grade boron ore in Northeast China. Usually every 1 ton of borax is produced, about 4-5 tons of borax mud is discharged. For a factory with an annual output of 5000 tons of borax, the annual discharge of boron mud is about 25000 tons. Liaoning Province is a major province in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/22C02F9/04C02F103/30
Inventor 梁吉艳李三喜刘金亮崔丽贾娜李莹
Owner SHENYANG POLYTECHNIC UNIV
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