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Comprehensive utilization method of boric sludge

A boron mud and mixture technology, applied in the field of comprehensive utilization of boron mud, can solve the problems of high energy consumption, low concentration of magnesium bicarbonate, environmental pollution, etc., and achieve the effects of unified social benefits, less cracks, and high strength and hardness

Inactive Publication Date: 2012-04-25
SHENZHEN XINNUOTAI INVESTMENT MANAGEMENT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The shortcoming of above-mentioned patent 3), 4), 5) is: contain the moisture of about 20% by weight in the boron mud, need expend a large amount of energy when roasting, make it become high-energy-consuming industry, do not meet the requirement of "low consumption and energy saving" Viewpoint; secondly, patents 4), 5) do not pass through the digestion process, and directly carbonize the boron mud after roasting, so that the carbonization process is carried out quite slowly, and the concentration of the reaction product magnesium bicarbonate is very low, corresponding to the light obtained at last The output of high-quality magnesium carbonate is very low, so that a large amount of magnesium contained in the boron mud is not extracted
[0028] In addition, none of the above-mentioned patents mentioned: how to deal with the waste residue left after extracting the magnesium compound
As a result, the problems of the dumping sites of these waste residues and the pollution of the environment have not been completely solved.

Method used

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  • Comprehensive utilization method of boric sludge
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 1) Stir 2000 kg of water, 1000 kg of boron mud (magnesia content is 30% by weight) and 200 kg of calcium oxide in a digestion tank, and digest at 95° C. for 150 minutes to obtain a digestion mixture.

[0063] 2) Pump the above-mentioned digestion mixture into the carbonization tank, add 8 tons of water at 25°C into the carbonization tank, and cool it at the same time to keep the carbonization temperature below 30°C. 1.5 hours.

[0064] 3) Filtrating the carbonized mixed solution to obtain magnesium bicarbonate solution and filter residue. The superheated steam of 100-120°C is passed through the magnesium bicarbonate solution for pyrolysis to obtain a precipitate of light magnesium carbonate, which is filtered, washed, dried, and then calcined at 800°C to obtain 235 kg of light magnesium oxide. The yield of the light magnesium oxide is 78%, and the quality of the product meets the "superior product" standard stipulated in the national standard (HG / T2573-1994) through th...

Embodiment 2

[0067] 1) Stir 3000 kg of water, 1000 kg of boron mud (magnesia content is 30% by weight) and 400 kg of calcium oxide in a digestion tank, and digest at 85° C. for 210 minutes to obtain a digestion mixture.

[0068] 2) Pump the above-mentioned digestion mixture into the carbonization tank, add 8 tons of water at 15°C in the carbonization tank, and cool it at the same time to keep the carbonization temperature below 30°C, and then pass in 0.2MPa carbon dioxide gas for carbonization for 2 hours. 3) Filtrating the carbonized mixed solution to obtain a magnesium bicarbonate solution. The superheated steam of 100-120°C was passed through the magnesium bicarbonate solution for pyrolysis to obtain light magnesium carbonate precipitates, which were filtered, washed, dried, and then calcined at 800°C to obtain 213 kg of light magnesium oxide. The yield of the light magnesium oxide is 71%, and the quality of the product meets the "superior product" standard stipulated in the national st...

Embodiment 3

[0071] 1) Stir 2,400 kg of water, 1,000 kg of boron mud (magnesia content is 30% by weight) and 300 kg of calcium oxide in a digestion tank, and digest at 90°C for 180 minutes to obtain a digestion mixture.

[0072] 2) Pump the above digestion mixture into the carbonization tank, add 9 tons of water at 20°C into the carbonization tank, and cool it at the same time to keep the carbonization temperature below 30°C. Add 9 kg of concentrated hydrochloric acid, pass through 0.3MPa carbon dioxide gas, and carbonize for 1.5 hours.

[0073] 3) Filtrating the carbonized mixed solution to obtain a magnesium bicarbonate solution. The superheated steam of 100-120°C is passed through the magnesium bicarbonate solution for pyrolysis to obtain a precipitate of light magnesium carbonate, which is filtered, washed, dried, and then calcined at 800°C to obtain 210 kg of light magnesium oxide. The yield of the light magnesium oxide is 70%, and the quality of the product meets the "superior produ...

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Abstract

The invention provides a comprehensive utilization method of boric sludge. Comprising a digestion step and a carbonization step in order, the method is characterized in that the digestion step consists of: with boric sludge taken in magnesium oxide terms, mixing boric sludge, calcium oxide and water in a weight ratio of 1:0.5-2:6-10, conducting digestion at a temperature of 85-100DEG C for 2-3.5h. The comprehensive utilization method of boric sludge in the invention has low energy consumption and high magnesium yield. Besides, the waste residue from magnesium compound extraction can be converted into microlites and / or hollow bricks completely, thus realizing high unification of ecological benefits, environmental benefits, economic benefits, and social benefits. And the microlites and hollow bricks prepared by the filter residue from magnesium compound extraction have the advantages of uneasy deformation, uneasy cracking, high strength and hardness, water and frost resistance, etc.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing boron mud. Background technique [0002] my country uses the "carbon soda method" to produce borax (Na 2 B 4 o 7 ) has a history of more than half a century. Its production process is as follows: using boron magnesium ore as raw material, after roasting, adding sodium carbonate (Na 2 CO 3 ), feed carbon dioxide gas simultaneously, make borax, and its reaction equation is: [0003] 2(2MgO·B 2 o 3 )+Na 2 CO 3 +CO 2 =Na 2 B 4 o 7 +4MgCO 3 [0004] The active ingredient in boronite is boron trioxide (B 2 o 3 ), its content only accounts for about 10% of boron magnesium ore, so a large amount of industrial waste-boron mud is produced every year. Due to the fine particle size of boron mud (120-180 mesh) and strong alkalinity (containing 0.3-0.7% by weight of sodium carbonate, and a pH value of about 8-9), no grass will grow in the place where boron mud is piled up, which not onl...

Claims

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Application Information

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IPC IPC(8): C01F5/02C04B18/04B09B3/00
CPCY02P20/141Y02W30/91
Inventor 谢新林李广凡杨俊智
Owner SHENZHEN XINNUOTAI INVESTMENT MANAGEMENT
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