JPH0144102B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Application Field> The present invention relates to a method for separating feldspar from chinastone by a flotation method and recovering clay and quartz, which are other useful components, more efficiently. Pottery stone is an important material as a raw material for ceramics, but since ordinary pottery stone contains a considerable amount of feldspar, which has a negative effect on fire resistance, it is necessary to separate and remove the feldspar. <Prior art> As a method for flotation to remove feldspar from pottery stone, the present inventors previously proposed a two-stage flotation method in Japanese Patent Application No. 59-97194 (see Japanese Patent Application Laid-open No. 60-241951). developed. This two-stage flotation method involves first performing clay flotation and then performing feldspar flotation. However, in this two-stage flotation method, a considerable amount of feldspar is entrained in the floating ore during the clay flotation process, so in order to reduce this, the pH is adjusted and Although beneficiation reduces the inclusion of feldspar, it has been confirmed that it has the disadvantage of lowering the recovery rate of clay. <Problems to be Solved by the Invention> The present invention aims to provide a method that can sufficiently separate feldspar without reducing the recovery rate of clay in feldspar-free flotation of pottery stone. It is something to do. <Means for solving the problems> In the present invention, in order to sufficiently separate feldspar without reducing the recovery rate of clay, pH is adjusted and
The purpose is to provide a method for flotation by adding polyethylene oxide, which is used as a flocculant for china clay and clay, to a chinastone powder slurry along with an alkylamine, which is a type of cationic scavenger. be. That is, in the present invention, for a slurry of chinastone powder adjusted to pH 3 or less, alkylamine is added at a rate of 10 to 35 g per ton of dry weight of chinastone, and polyethylene oxide is added at a rate of 10 to 35 g per 1 ton of slurry having a pulp concentration of 10%.
A method of separating feldspar by flotation of china stone, which is characterized by adding ~4 mg over 3 to 5 times, and a method performed on the strong acid side, and a slurry of china stone powder adjusted to a pH of 10 or more, A pottery stone characterized by adding 50 to 100 g of alkylamine per ton of dry weight of pottery stone and 2 to 8 mg of polyethylene oxide per 1 ton of slurry having a pulp concentration of 10% over 3 to 5 times. This relates to a method of separating feldspar using flotation, which is carried out on the strongly alkaline side. Note that the alkylamine used in the present invention (hereinafter referred to as
As COAC), hydrochloride or acetate of alkylamine such as alkylamine or diamine, or a mixture of alkylamine and petroleum sulfonic acid in an equivalent ratio is used, and polyethylene oxide (hereinafter referred to as PEO) is a nonionic A water-soluble polymer compound with HO―(CH ₂ CH ₂ O) _o ―
It has the general formula CH ₂ CH ₂ OH, and its appearance is granular. This PEO has an average molecular weight of 430~
It has an extremely large molecular weight of 4.8 million, and although it is water-soluble, it does not dissolve immediately in water, so in the present invention, about 0.1 g of this PEO is dispersed on the water surface, swelled overnight, and then diluted to a predetermined concentration. I decided to use it. Next, pH adjustment in the present invention was performed using sulfuric acid and sodium hydroxide, and pine oil was used as a foaming agent. <Examples and effects> Pottery stone from Amakusa-cho, Amakusa-gun, Kumamoto Prefecture (SiO ₂ 74.32% by weight, Al ₂ O ₃ 16.26% by weight, Na ₂ O 2.67% by weight,
K ₂ O (3.59% by weight) was ground in a ball mill to obtain raw soil with a particle size distribution as shown in Table 1.

[Table] Using the raw soil shown in Table 1, a specified weight of raw soil was placed in a 500 c.c. cell of a Fahrenwald type flotation machine.
A pH aqueous solution was added and stirred for 2 minutes. The pulp concentration at this time was 10%, and the pH was measured after the experiment was completed. After stirring for the above 2 minutes, CAOC, PEO, and pine oil as a foaming agent were added in this order, and after addition of each reagent, the mixture was stirred for 2 minutes, 2 minutes, and 1 minute, and then flotation was performed for 10 minutes. Subsequent flotation was repeated by adding COAC and PEO in this order, stirring for 2 minutes after each reagent addition, and flotating for 10 minutes. After drying and weighing the flotation product, the mineral composition was determined by the X-ray powder method, and the flotation rate and actual yield were determined. For comparison, an experiment was also conducted in which only COAC was added in addition to the foaming agent. Figure 1 shows a graph showing the relationship between pH, mineral composition in floating ore, and floating rate in an acidic region. It can be seen from Figure 1 that the clay content in the floating ore tends to decrease slightly and the feldspar content increases slightly due to the addition of PEO, but the overall floating rate increases considerably. It is also seen that as the pH increases, the amount of feldspar mixed into the floating ore increases and the clay content in the floating ore decreases. Next, Figure 2 shows the actual yield of each mineral on the acidic side.
Although the addition of feldspar and quartz into the floating ore slightly increases, it is clear that the actual yield of clay has been improved by more than 30%. From the above figures 1 and 2, it can be seen that on the acidic side, pH 3 or less is preferable. Next, Figure 3 shows the Newtonian separation efficiency of each mineral when the amount of PEO added is 2 mg/time and the amount of COAC added is changed when pH = 2.
The figure also shows the Newtonian separation efficiency of each mineral when the amount of COAC added was 25 g/t per time and the amount of PEO added was changed when pH = 2. This third
From the figure and Figure 4, COAC on the acidic side is 10 to 35 g/t, and PEO is 1 to 4 mg/t per dose.
It has been found from other experiments that it is preferable to add the above amount 3 to 5 times. Next, Figure 5 is a graph showing the relationship between pH on the alkaline side, mineral composition in floating ore, and floating rate, and Figure 6 is a graph showing the relationship between pH and actual yield on the alkaline side. However, from this figure 5, pH
The overall floating rate tends to decrease as the pH increases, especially when PEO is added.
It can be seen that the floating rate decreases rapidly in the range exceeding 10. This is thought to be due to an increase in undissociated amines at pH 10 or higher. However, as the pH increases, the content of clay in the suspended solids increases, and by adding PEO,
It can be seen that the content of clay is significant in the above areas. Also, it can be seen from the actual yield of each component in Figure 6 that the addition of PEO has an effect. Figures 5 and 6 above
The figure shows that pH 10 or higher maintains the clay recovery rate.
It can be said that it is suitable for suppressing the contamination of feldspar. Next, Figure 7 shows the Newtonian separation efficiency of each mineral when pH = 10.4 to 10.7, PEO was added at a constant rate of 4 mg/time, and the amount of COAC added was varied, and Figure 8 1 COAC at pH 9.9-10.4
The Newtonian separation efficiency of each mineral is shown when the amount of PEO added is varied, with the addition constant at 50 g/t per time, four times. From Figures 7 and 8, COAC on the alkaline side is 1. 50~100g/t per cycle, and
It has been found from other experiments that it is preferable to add PEO in an amount of 2 to 8 mg/time, and that it is desirable to add the above-mentioned equivalent amount 3 to 5 times. <Effects of the invention> As described above, according to the present invention, COAC and
By using PEO in combination and adjusting the pH to a strongly acidic side of 3 or less or a strong alkaline side of 10 or more, clay and feldspar can be better selectively separated while maintaining a high clay yield. There is.

[Brief explanation of drawings]

Figure 1 is a graph showing the flotation rate on the acidic side and the composition of each mineral in floating ore, Figure 2 is a graph showing the actual yield of each mineral, and Figures 3 and 4 are COAC and PEO, respectively. Graph showing the Newtonian separation efficiency of each mineral when the amount of addition is changed, 5th
The figure is a graph showing the flotation rate on the alkali side and the composition of each mineral in the floating ore, Figure 6 is a graph showing the actual yield of each mineral, and Figures 7 and 8 are the same, respectively, with the addition of COAC and PEO. A graph showing the Newtonian separation efficiency of each mineral when the amount is changed.

Claims (1)

[Claims] 1. For a slurry of china stone powder adjusted to pH 3 or less, 10 to 35 g of alkylamine per 1 ton of dry weight of china stone and 10 to 35 g of polyethylene oxide are added per ton of dry weight of china stone.
1 to 4 mg per slurry with a pulp concentration of 3
A method for separating feldspar by flotation of pottery stone, which is characterized in that it is added five times. 2 Add alkylamine to the slurry of chinastone powder adjusted to pH 10 or higher by adding 1 dry amount of chinastone at a time.
50-100g per ton and 2-8mg of polyethylene oxide per slurry with 1% pulp concentration.
A method for separating feldspar by flotation of pottery stone, characterized by adding the following three to five times.