Method for preparing solid silicic acid from filter residue of boric sludge

The technology of boron mud and filter residue is applied in the field of preparing solid silicic acid to achieve the effect of great economic benefit and improving the ability of deep processing

Inactive Publication Date: 2011-08-31
王嘉兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to process and comprehensively utilize the re-polluted waste of boron mud waste, in addition to producing magnesium and boron compounds, silicon products are also produced, which not only avoids secondary pollution, but also provides The enterprise creates great economic benefits, which can be described as a model of comprehensive chemical management and utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1, a kind of method for preparing solid silicic acid with boron mud filter residue described in the present embodiment, comprises the steps:

[0015] Take 500 kg of boron mud (20% of silicon dioxide and 38% of magnesium oxide) for reaction, heat the boron mud to 60-80 degrees with steam, keep it for 1-2 hours, and then dry it with a centrifuge to achieve liquid-solid Separation to obtain filtrate and filter cake boron mud, and the filtrate is sent for further processing;

[0016] The filter cake boron mud (calculated as magnesium oxide) and hydrochloric acid are reacted in the corrosion-resistant first reactor with a pure mass ratio of 1:1.83, and a chemical reaction occurs under gentle stirring, and the reaction generates magnesium chloride hydrate, and other components generate chloride Calcium, and a very small amount of manganese chloride, the hydrate of magnesium chloride is filtered to obtain a clarified filtrate and silica filter residue, and the clari...

Embodiment 2

[0020] Embodiment 2, a kind of method for preparing solid silicic acid with boron mud filter residue described in the present embodiment, comprises the steps:

[0021] Take 500 kg of boron mud (20% of silicon dioxide and 38% of magnesium oxide) for reaction, heat the boron mud to 60-80 degrees with steam, keep it for 1-2 hours, and then dry it with a centrifuge to achieve liquid-solid Separation to obtain filtrate and filter cake boron mud, and the filtrate is sent for further processing;

[0022] The filter cake boron mud (calculated as magnesium oxide) and hydrochloric acid are reacted in the corrosion-resistant first reactor with a pure mass ratio of 1:2.03, and a chemical reaction occurs under gentle stirring, and the reaction generates magnesium chloride hydrate, and other components generate chloride Calcium, and a very small amount of manganese chloride, the hydrate of magnesium chloride is filtered to obtain a clarified filtrate and silica filter residue, and the clari...

Embodiment 3

[0026] Embodiment 3, a kind of method for preparing solid silicic acid with boron mud filter residue described in the present embodiment, comprises the steps:

[0027] Take 500 kg of boron mud (20% of silicon dioxide and 38% of magnesium oxide) for reaction, heat the boron mud to 60-80 degrees with steam, keep it for 1-2 hours, and then dry it with a centrifuge to achieve liquid-solid Separation to obtain filtrate and filter cake boron mud, and the filtrate is sent for further processing;

[0028] The filter cake boron mud (calculated as magnesium oxide) and hydrochloric acid are reacted in the corrosion-resistant first reactor with a pure mass ratio of 1:1.63, and a chemical reaction occurs under gentle stirring, and the reaction generates magnesium chloride hydrate, and other components generate chloride Calcium, and a very small amount of manganese chloride, the hydrate of magnesium chloride is filtered to obtain a clarified filtrate and silica filter residue, and the clari...

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Abstract

The invention discloses a method for preparing solid silicic acid from filter residue of boric sludge. The method comprises the following steps of: heating boric sludge to the temperature of between 60 and 80 DEG C by using steam and keeping the temperature for 1 to 2 hours, throwing to dry by using a centrifugal machine to obtain filter cake boric sludge, reacting the filter cake boric sludge and hydrochloric acid to generate hydrate of magnesium chloride, filtering the hydrate of magnesium chloride to obtain silicon dioxide filter residue, reacting the silicon dioxide filter residue and sodium carbonate to obtain sodium metasilicate nonahydrate aqueous solution, and filtering to remove the insoluble impurities to obtain the clear filtrate; and reacting the clear filtrate and sulfuric acid solution to generate the mixed solution of silicic acid and sodium sulfate, and filtering to obtain filter cake silicic acid jelly and clear filtrate, washing the silicic acid jelly, throwing to dry, freezing, crushing and packing to obtain the silicic acid powder product; and performing inspissation on the filtrate to obtain crystal, washing the crystal, throwing to dry, crushing, and packing to obtain the sodium sulfate crystal product. The waste material of the boric sludge which is polluted again is treated so as to obtain solid silicic acid, and secondary pollution is avoided and economic benefit is created.

Description

technical field [0001] The invention relates to the technical field of treatment and comprehensive utilization of inorganic chemical wastes, in particular to a method for preparing solid silicic acid from boron mud filter residue. Background technique [0002] Boron mud is based on boronite (2MgO·B 2 o 3 ·H 2 O) is raw material, by roasting, pulverizing, mixing with soda ash, adopting carbon water method to produce borax (Na 2 B 4 o 7 10H 2 O), the solid waste that remains after washing, crystallization process extracts borax. One ton of borax can produce 4 tons of boron mud, and a borax plant with an annual output of 8,000 tons can produce 32,000 tons of boron mud per year. Due to the large discharge of boron mud, various comprehensive utilization methods are currently used in China. In addition to the production of light magnesium carbonate, magnesium oxide and rubber and plastic fillers, there are also production of boron magnesium phosphorus compound fertilizers, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 王嘉兴
Owner 王嘉兴
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