JPS60153959A - Purification of high purity quartz - Google Patents

Abstract

PURPOSE:To separate quartz particles each containing impurities therein from pure quartz particles, in a floatation method of silica sand, by specifying the pH of pulp. CONSTITUTION:Water is added to silica sand washed with water to prepare a slurry. As an amine type collector to be used, there are primary - tertiary amines, primary amine acetate or diamine and HCl, H2SO4 or HF is used in adjusting the pH of the slurry (hereinafter referred to as pulp) and, at the time of the flotation of feldspar or the flotation of silica sand from a precipitate after the flotation of feldspar, adjustment is performed so as to set the pH of the pulp to 3-6. Only by assembling the above-mentioned condition in a usual flotation process, quartz having extremely high purity is simply obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a method for flotation of silica sand, and in particular to a method for flotation of high-purity quartz that can separate quartz particles containing impurities from pure quartz particles. Relating to a purification method.

b. Prior Art Various methods have been used to purify silica sand, one of which is the flotation method.

The flotation method is also considered to be a divine method, and the process is broadly divided into a combination of mica flotation, iron flotation, feldspar flotation, and silica sand flotation. The purification process will be explained below by giving one example.

As a recovery, silica sand flotation is carried out by floating iron-containing minerals using fatty acids as a scavenger, and silica sand concentrate is recovered as 70s. The precipitate (called tail) is impurities such as chert and table fragments called coarse sand, and quartz containing a large amount of these.

P)'' The flotation rate of silica sand is maximum at heel 7 to g, and it is used because it is industrially advantageous.

C. Object of the Invention The object of the present invention is to provide a novel quartz refining method that yields quartz with higher purity than quartz obtained by conventional silica sand refining methods.

d.Structure of the Invention The present invention relates to a method for refining silica sand in which flotation is carried out using 70% silica sand using an amine-based complementing agent, and a method for refining high-purity quartz, which is characterized in that the number of H valves is maintained at 3 to 2. It is.

Amine-based complement agents include primary amines and primary amines. It is desirable that the amine complementing agent be added in a large amount, but it is the amount that is usually added.

For example, if it is 50g or more, the effect will be seen.

pt″l Pal 1 All kinds of acidic and alkaline reagents can be used for the preparation of sardines, but HOlHH2SO41HF tN
aOH and the like are preferred, with H2SO4 being particularly desirable.

The particle size of the silica sand to be subjected to flotation may be a constant particle size of 1000 .mu.m or less, preferably 50 to 300 .mu.m, as is commonly used.

e Effect I-1 The reason why the number of valve holes is limited to 3 to 2 in the present invention is as follows: When the valve hole is 3 or less, both high-purity silica sand and low-purity silica sand will not float, and the valve PH will increase. This is because when the value is 6 or more, both high-purity silica sand and low-purity silica sand become suspended.

l-1 By performing silica sand flotation in the range of valves N-3 to B of the present invention, it is possible to separate not only high-purity silica sand from impurities such as chert and table fragments, but also from low-purity silica sand. You can. Pulp H: 3 to Otsu, preferably around 5.

The present invention will be explained below based on examples.

f Example Example 1 7 kg of silica sand from Seto was milled in an alumina ball mill.
The particles were pulverized for a period of time until the particle size was 250 μm or less. Thereafter, this crushed silica sand was washed with water and drained water was added to wash away unnecessary materials, and feldspar flotation was carried out at a bulb concentration (sand/(water/sand)) of 20%. Here, for feldspar flotation, petroleum sulfonate o, pg and H dodecylamine o, Jg as an amine diameter complementing agent are added to the slurry of the crushed silica stone and water, and slurry #4 (referred to as pulpy) is mixed with sulfuric acid. It was adjusted to 2.5 using The above-mentioned feldspar flotation was carried out for one hour, and the floating feldspar-containing bubbles (referred to as 70s) were removed from the precipitate (referred to as tail) K. The high-purity quartz of the present invention was purified.

Although the silica sand slurry subjected to the above-mentioned feldspar flotation contained petroleum sulfonate, without washing with water, Dobushiruakun o and tg were further added as amine-based complement agents to prepare a sample slurry. It is preferable for the petroleum sulfonate to coexist with the amine complementing agent because this improves the floating properties of the quartz. Then, the U valve of the sample was adjusted to #, S- using sodium hydroxide. Then, the main silica sand flotation is carried out for one hour, and the floated pure silica sand containing no impurities is complemented. Here, the quartz containing impurity minerals etc. remains in the tail. Thereafter, the 70 quartz of quartz obtained by this method was washed with water, resulting in approximately 0.6 kg of highly pure quartz.

Table 1 shows the results of an analysis using fluorescent X-rays of the chemical composition of the Seto silica sand used in this example and the highly pure quartz obtained in this example. The same table also shows the analytical results of conventional method flotation quartz for comparison in which 100 g of dodecylamine/P silica/lon was added as an absorbent and Pulp Book 7) was carried out. Here, the amount of purified quartz obtained from 7 kg of raw silica sand was approximately 0.73 kg.

As is clear from the table, the 3 io 2 purity of this example is qq, ! It can be seen that quartz is complemented with much higher purity than the conventional methods of 9J and 1%. This can be read.

Example 2 1 kg of silica sand from Onsentsu was made into a slurry with a valve concentration of 20%, 0.3 g of 1-decylamine was added, and μ was adjusted to 1.7 using sulfuric acid. 0.2 g of dodecylamine was added to the silica sand recovered as 70 s. and petroleum sulfonate o, tIP
1' (g) was added and the force was adjusted to 2.5 using sulfuric acid. The feldspar separated as 70 s was separated and approximately 0.t2 kg of high purity quartz was obtained as a tail. Then, silica sand flotation was carried out, followed by feldspar flotation in the same manner as above, to obtain approximately 0.7 kg of conventionally refined silica sand.The chemical composition analysis results of each silica sand by fluorescent X-ray analysis are shown in Table 1. .

Also in this example, the conventional method 5i02 purity 9J, II%
It can be seen that quartz with a high purity of 3% was obtained.

g. Effects of the Invention As described above, the method for refining high-purity quartz of the present invention uses commonly used raw materials and does not require special equipment or additives, resulting in higher purity than the conventional method. High quality quartz is easily obtained.

Furthermore, as is clear from the above embodiments, the present invention involves a flotation process (crushing, pulverizing and 1 classification) which is normally carried out.

Polished ore, magnetic separation, electrostatic separation, water washing, specific gravity separation, acid and alkali treatment, mica flotation, iron flotation, feldspar flotation.

It can be optionally incorporated into or replaced with the process consisting of silica sand flotation 1, etc.).

Claims (1)

[Claims] (1) A method for refining high-purity quartz, which is characterized by maintaining pulp hesitation between 3 and O in a method for refining silica sand in which flotation is carried out using silica sand as a froth using an amine-based scavenger.