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Preparation method for separating and purifying silicon dioxide and cerous chlorate from seeing stone waste material

A technology of silicon dioxide and cerous chloride, applied in the field of waste recycling

Inactive Publication Date: 2009-01-14
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] There are certain conditions for use in the application of these technologies, but there is no report on purification from crystal waste. The present invention takes low-cost operation and high output return as indicators, aims at realizing waste recycling, and takes product reutilization as an indicator. Premise, the purified products are silicon dioxide and cerous chloride (cerium oxide and cerium can also be purified as required)

Method used

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  • Preparation method for separating and purifying silicon dioxide and cerous chlorate from seeing stone waste material

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Experimental program
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Effect test

Embodiment 1

[0021] At room temperature, a certain amount of crystal stone waste is weighed and passed through a 200-mesh sieve to obtain a raw material with a particle size of <75um. At room temperature, phosphoric acid with a concentration of 0.1 mol / L was selected as the impurity remover. Add phosphoric acid to 1 g of crystal stone waste, stir for 0.5 to 1.0 h, let stand, and filter. The filtrate is a mixed solution of Ca(H2PO4)2, Mg(H2PO4)2 and NaH2PO4. The filter residue is a mixed solid of silicon dioxide and cerium oxide. Add 50 mL of 12 mol / L concentrated hydrochloric acid to the mixed solid of silicon dioxide and cerium oxide, stir with a plastic rod in a water bath at 80°C and react for 2 hours until no pungent odor is produced. Filtration, the filter residue is silica solid, and the filtrate is cerium salt solution. The percentage of silicon dioxide is 93.44%, and the percentage of cerium is 92.50%. The reaction process of filtrate is as follows:

[0022] CaO+2H 3 PO 4 =Ca...

Embodiment 2

[0026] The mixed solid of silicon dioxide and cerium oxide obtained in Example 1 is washed until the washing water pH=6~8, and the temperature is controlled: <120° C. for drying; 50 mL of concentrated hydrochloric acid with a molar concentration of 12 mol / L is added as a separating agent to separate The reaction conditions are water bath at 60~100°C, the reaction time is 1~3h, filter, and the filtered filtrate is evaporated and crystallized at a temperature of <90°C until the crystals of cerous chloride heptahydrate are completely precipitated, and cerium oxide crystals are obtained after oxidation; The filter residue is dried at a temperature of <150° C. for 1 to 3 hours to obtain silicon dioxide with a percentage content of 96.38% and a percentage content of cerium of 97.55%. The reaction process of filtrate is as follows:

[0027] 2CeO 2 +8Hcl=2Cecl 3 +Cl 2 ↑+4H 2 o

Embodiment 3

[0029] Select the filter residue solid in Example 1 or 2, repeat the steps of Example 2 and Example 3 several times to obtain a silica solid, dry it at 150°C for 2h, and then roast it in a muffle furnace at 700°C for 0.5h to obtain the purity More than 99% precipitated silica products.

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Abstract

The invention relates to a preparation method of separating and purifying silicon dioxide and cerous chloride from crystal stone wastes, belonging to the field of resource reuse, and is characterized by the following steps: 1) removing impurity: the crystal stone wastes is added with phosphoric acid as an impurity-removing agent and stirred to obtain a mixture of silicon dioxide and cerium oxide; and 2) separation: the mixture is added with concentrated hydrochloric acid as a separation agent, treated by water bath and filtration, the filtrate is evaporated and crystallized to fully precipitate cerous chloride heptahydrate crystals, which is oxidized to obtain cerium oxide crystals; the filter residues are dried at a temperature of <150 DEG C for 1 to 3 hours to obtain silicon dioxide. The preparation method achieves maximum utilization of resources of solid wastes, can transform trash into treasure and obtain phosphate by-products of high economic value and cerous chloride of high purity and high price, and also has advantages of low processing costs, highly pure target composition and significant economic benefits. The purification process follows the idea of clean production, energy saving and reducing emission so as to avoid the problem of environmental pollution.

Description

1. Technical field [0001] The invention relates to a preparation method for separating and purifying silicon dioxide and cerous chloride from crystal stone waste, and belongs to the field of waste recycling. 2. Background technology [0002] Crystal (mineral name quartz) is an important industrial mineral and gemstone mineral. The main component is silicon dioxide, in which the silicon and oxygen atoms are arranged in a regular and orderly manner, forming a crystal with a certain crystal structure. It also contains various trace amounts of gold, so it will form various colors. Natural crystals are rare minerals in the country. The country has long developed, utilized and protected crystal minerals as special non-metallic mineral resources, and they are very limited and cannot be regenerated after mining. The characteristics and uses of crystals cannot be replaced by other mineral resources, because crystals have unique Therefore, it is widely used in national defense, elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C01F17/00
Inventor 韩剑红韩静涛张连科安胜利陈荣郭亚琼高玲琴班娜
Owner INNER MONGOLIA UNIV OF SCI & TECH
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