A kind of casio prepared from waste silicon slag 3 Methods

Abstract

The invention belongs to the technical field of silicate, in particular to a method for preparing CaSiO from waste silicon slag 3 Methods. The method comprises the following steps: firstly, grinding the waste silicon slag and mixing it evenly with sodium hydroxide to obtain a mixed material; secondly, roasting the mixed material, adding water, stirring and dissolving, filtering to obtain a sodium silicate solution and adjusting pH value, purifying and removing impurities; again, crushing limestone and calcining to obtain activated calcium oxide, and emulsifying activated calcium oxide with water to obtain calcium hydroxide emulsion; finally, mixing calcium hydroxide emulsion and sodium silicate solution in proportion, Preparation of CaSiO by Hydrothermal Reaction 3 And sodium hydroxide solution, evaporate and concentrate crystallization to obtain sodium hydroxide and return to extract silicon. The invention provides a hydrothermal method for preparing micro-nano CaSiO with controllable morphology 3 The method, by changing whether to add additives and the type and amount of additives can be achieved on CaSiO 3 shape control.

Description

technical field [0001] The invention belongs to the technical field of silicate, in particular to a method for preparing CaSiO from waste silicon slag 3 Methods. Background technique [0002] There are more than 79 kinds of silicon-containing minerals in nature, and the reserves are abundant. Natural high-quality minerals include crystal, quartz, etc. Common metallurgical minerals such as zinc oxide ore, laterite nickel ore, boron magnesium ore, copper oxide ore and other resources and metallurgical secondary resources fly ash are rich in silicon resources. [0003] The traditional method of using these resources generally focuses on the extraction and utilization of high-value non-ferrous metals, such as zinc oxide ore, which generally focuses on the extraction of zinc and lead, laterite nickel ore, which focuses on the extraction of nickel and cobalt (partial recovery of iron), and fly ash. It is used to extract the aluminum, etc., but the silicon with a large content c...

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Problems solved by technology

[0003] The traditional method of using these resources generally focuses on the extraction and utilization of high-value non-ferrous metals, such as zinc oxide ore, which generally focuses on the extraction of zinc and lead, laterite nickel ore, which focuses on the extraction of nickel and cobalt (partial recovery of iron), and fly ash. It is used to extract the aluminum, etc., but the silicon with a large content cannot be rationally utilized, and becomes waste discharge, causing serious environmental pollution and waste of resources (generally containing acid or alkali)

The stockpiling of silicon slag not only occupies land, but also wastes resources, and the residue of leaching agents or reactants puts a huge pressure on the environment

[0004] Some also extract silicon in the silicate phase to make industrial water glass or precipitate silica (white carbon black) by precipitation method. Because white carbon black has a wide particle size range and obvious agglomeration phenomenon, it can only be used for ordinary and high-grade In low rubber or coatings, the performance cannot meet the needs of high-end rubber, coatings, plastics, ceramics industries, let alone enter the cosmetics and pharmaceutical industries, the added value is low, and the domestic annual consumption is only about 3 million tons

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