Oxalic acid infusion process for removing film iron on silica sand surface

A leaching method, oxalic acid technology, applied in the direction of silicon oxide, etc., can solve the problems of high power consumption, dangerous operation process, unsatisfactory mechanical scrubbing effect, etc., and achieve the effect of excellent iron removal efficiency

Inactive Publication Date: 2007-05-16
YANSHAN UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For a long time, the method of removing thin film iron on the surface of silica sand is mainly physical method, such as mechanical scrubbing method (ZL200420096986.9, ZL95212840.3), but because the thin film iron is firmly attached to the surface of quartz sand and the thickness is very thin, the mechanical scrubbing effect is very poor Ideal and high power consumption, severe mechanical wear; in addition, there are chemical beneficiation methods, such as hydrochloric acid leaching method (ZL00120586.2), chlorination roasting method (ZL96105535.9) and other methods
Although these methods are effective, they are severely corrosive to equipment, dangerous in operation, and harmful to the environment. Therefore, it is difficult to widely apply them in industry.
ZL200410014058.8 and ZL200410044471.9 respectively proposed "the method of preparing ultra-fine high-purity quartz material by using vein quartz" and "the preparation and purification process of quartz sand and quartz powder and their products", although the oxalic acid cleaning process is included, However, no suitable process conditions are given, especially the recommended process is not aimed at the problem of thin film iron on the surface of natural silica sand, so the disclosed scheme is not suitable for the removal of thin film iron on the surface of silica sand

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  • Oxalic acid infusion process for removing film iron on silica sand surface
  • Oxalic acid infusion process for removing film iron on silica sand surface

Examples

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Embodiment 1

[0019] An oxalic acid leaching method for removing iron from natural silica sand to produce high-quality silica sand for float glass. The process flow is shown in Figure 1.

[0020] Source of raw material: Dalin quartz sand in Horqin area of ​​Inner Mongolia is used as raw material, maximum particle size: 1.0mm, iron content (Fe 2 o 3 )0.34%, the process steps are as follows:

[0021] 1. Screening: Since the float glass requires the particle size range of raw materials to be 0.7-0.1mm, it is screened first, and the sieve hole size is 0.7mm;

[0022] 2. Mechanical scrubbing: Use a conventional impeller scrubbing machine to mechanically scrub the mixture of sand and water. The purpose is to dissociate impurities such as clay adhering to the surface of the silica sand from the surface of the silica sand. The scrubbing time is 10 minutes, and the weight concentration of the pulp is 50%;

[0023] 3. Desliming: Use a hydraulic classifier to separate the scrubbed clay and particle...

Embodiment 2

[0030] A method for removing iron by leaching silica sand with oxalic acid on artificial silica sand, using quartz sandstone as raw material, the process flow chart is shown in Figure 2.

[0031] Raw material: Quartz sandstone from Luanxian County, Hebei Province, which has been crushed, screened, magnetically separated, and classified in advance. The particle size range: 0.6-0.1mm. 2 o 3 Total): 0.075%, the process steps are as follows:

[0032] 1. Oxalic acid leaching: place the silica sand in an oxalic acid solution at a temperature of 82°C, the concentration of oxalic acid is 6%, the ratio of the oxalic acid solution to the quartz sand is 100:60, stir properly, and the leaching time is 3 hours;

[0033] 2. Solid-liquid separation: solid-liquid separation of oxalic acid and silica sand;

[0034] 3. Washing and filtering: wash the silica sand several times with clean water;

[0035] 4. Drying: Dry the silica sand until the water content is less than 5%.

[0036] After th...

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Abstract

The invention discloses an oxalic acid leaching method on the silica sand surface film iron, which comprises the following steps: placing silica sand with film iron on the surface in the oxalic acid solution with density at 1-10%; making the quality rate of oxalic acid solution and silica sand more than 100: 100; heating to 80-90 Deg C; stirring fitfully; dissolving film iron on the silica sand by oxalic acid to form ferric oxalate after 1-5h; proceeding solid-liquid separation; washing through clean water; filtering to obtain the product.

Description

technical field [0001] The invention relates to a chemical beneficiation method for removing iron from silica sand, in particular to an oxalic acid leaching method for removing thin film iron on the surface of silica sand. Background technique [0002] Silica sand is a mineral product with a high content of silicon dioxide and a particle size composition generally less than 1mm. It is the main raw material for many industrial products such as glass. In most cases, iron in silica sand is a harmful component, so removing iron from silica sand is an important topic in the field of mineral processing. The occurrence state of iron impurities in silica sand determines whether the beneficiation method can remove them and the degree of removal. Generally, the occurrence state of iron can be divided into five forms: existing in clay minerals; existing in heavy minerals and magnetic minerals; Exist in light minerals; exist in thin film iron; exist in joints or lattices. Conventional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/113
Inventor 赵洪力
Owner YANSHAN UNIV
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