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Method for preparing sodium metasilicate nonahydrate from filter residue obtained by treating boric sludge

A technology of boron mud and filter residue, applied in the direction of silicate, alkali metal silicate, etc., to improve the ability of deep processing and the effect of great economic benefits

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 prod

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1, a kind of method described in the present embodiment is treated filter residue with boron mud and prepares the method for nonahydrate metasilicon, comprises the following 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 ...

Embodiment 2

[0019] Embodiment 2, a kind of method described in the present embodiment is treated filter residue with boron mud and prepares the method for nonahydrate metasilicate, comprises the steps:

[0020] 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;

[0021] 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 silic...

Embodiment 3

[0024] Embodiment 3, a kind of method described in this embodiment is treated filter residue with boron mud and prepares the method for nonahydrate metasilicate, comprises the following steps:

[0025] 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;

[0026] 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 si...

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Abstract

The invention discloses a method for preparing sodium metasilicate nonahydrate from filter residue obtained by treating boric sludge. The method comprises the following steps of: heating boric sludge by using steam to the temperature of between 60 and 80 DEG C and keeping the temperature for 1 to 2 hours, and throwing to dry by using a centrifugal machine to obtain filter cake boric sludge; reacting the filter cake boric sludge and hydrochloric acid in a pure mass ratio of 1:(1.63-2.03) in a corrosion resistant first reactor, performing chemical reaction with slowly stirring to generate hydrate of magnesium chloride, and filtering the hydrate of magnesium chloride to obtain the silicon dioxide filter residue; and reacting the silicon dioxide filter residue and sodium carbonate in a pure mass ratio of 1:(1.54-1.94) in a closed second reactor, heating, pressurizing, and slowly stirring to generate sodium metasilicate nonahydrate aqueous solution, filtering, feeding the filtrate into a reduced pressure distillation device, and performing inspissation until only nine crystallization waters are left in the solution, discharging, cooling, and crystallizing to obtain a sodium metasilicate nonahydrate crystal product. The waste material of the boric sludge which is polluted again is treated, and the 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 nonahydrate silicon metasilicate by treating filter residue with boron mud. 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 phospho...

Claims

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Application Information

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IPC IPC(8): C01B33/32
Inventor 王嘉兴
Owner 王嘉兴
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