Method for producing silicon dioxide and calcium silicate by phosphorus residue

A silicon dioxide and calcium silicate technology, applied in the direction of silicon dioxide, silicon oxide, silicate, etc., can solve the problem of low utilization value

Inactive Publication Date: 2011-07-06
张胜勇
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Problems solved by technology

In the past, a small part was sold to cement factories as cement admixture to produce Portland

Method used

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Embodiment 1

[0007] A method for producing silicon dioxide and calcium silicate by utilizing phosphorus slag, comprising the following specific steps, pulverizing 500kg of phosphorus slag into coarse powder of 80-100 mesh, putting it into a corrosion-resistant reactor, fully mixing with 500kg of water, and then feeding Add excessive hydrochloric acid into the corrosion-resistant reactor to obtain a mixture containing silica precipitate and chloride, and filter to obtain the mixed filtrate and silica filter cake mainly composed of calcium chloride chloride; the silica filter cake is passed through Washing, drying and crushing to obtain industrial silica products;

[0008] The chloride mixed filtrate mainly composed of calcium chloride is put into the reactor to react with excess sodium silicate solution, calcium ions combine with silicate to form calcium silicate and precipitate; after filtration and separation, calcium silicate filter cake and clarified filtrate are obtained ; Calcium sili...

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Abstract

The invention relates to a method for producing silicon dioxide and calcium silicate by phosphorus residue, which comprises the steps of: grinding the phosphorus residue into coarse powder with 80-100 meshes, fully mixing the coarse powder with water and then reacting with excess hydrochloric acid, and obtaining mixture containing silicon dioxide precipitate and chloride; filtering the mixture, and obtaining mixed filtrate of chloride mainly containing calcium chloride as well as a silicon dioxide filter cake; washing, drying and grinding the silicon dioxide filter cake, and obtaining an industrial silicon dioxide product; putting the mixed filtrate of the chloride mainly containing the calcium chloride into a reactor and reacting with excess sodium silicate solution, and leading calcium ions to be combined with silicate for generating calcium silicate for precipitation; filtering and separating the obtained precipitate, and obtaining a calcium silicate filter cake and clear filtrate; and finally, washing, drying and grinding the calcium silicate filter cake, and obtaining the industrial calcium silicate.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization and treatment of phosphorus slag, in particular to a method for producing silicon dioxide and calcium silicate by using phosphorus slag. Background technique [0002] Phosphorus slag is the solid waste discharged during the production of yellow phosphorus by electric furnace method. In the past, a small part was sold to cement factories as cement admixture to produce Portland cement, and most of it was used as building materials, and its utilization value was not high. The chemical composition of phosphorus slag is mainly silicon dioxide, calcium oxide, calcium fluoride and a small amount of oxides of aluminum, iron, magnesium and phosphorus. Therefore, it is necessary to explore the industrial utilization method of phosphorus slag and give full play to its potential economic value. Contents of the invention [0003] The chemical composition of phosphorus slag is mainly silic...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01B33/24B09B3/00
Inventor 张胜勇
Owner 张胜勇
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