SU988344A1 - Modifier for flotation of non-sulphide ores - Google Patents

Description

The invention relates to mineral processing * by flotation and can be used in the flotation of apatite fluorite, barite and other non-sulfide ores. Non-sulfide-enrichment rates. ores are largely determined by the type of modifier. As is known, in the enrichment of non-sulfide ores, inorganic salts are mainly used as modifying reagents: water glass (sodium silicate), sodium silicofluoride, phosphates, chromates and b'ichromats [1), water glass in combination with aluminum salts [2J .

Organic Compounds are known to use starch, destrin, sulfite-alcohol barite, carboxymethyl cellulose (CMC), collagen-tannide solution [3], a combination of tylose or starch with water-soluble urea-formaldehyde resins £ 4] as modifiers.

The most common modifier used in flotation of almost all types of non-sulfide ores individually or in combination with other reagents is water glass. This is a cheap and affordable product.

However, these modifier reagents have several disadvantages. So, the most common modifier - liquid glass does not differ in the selectivity of action, at high costs it suppresses all minerals and most selectively acts only in steaming conditions.

Organic depressants are most often polymers and therefore have a high cost (CMC), are made from food raw materials and are inaccessible in our country (starch), have low selectivity (sulfite-alcohol bard), or their action is very limited (collagen-tannide reagent ) None of the known reagents selectively depress fosterite · (magnesium silicate) - a harmful admixture of certain types of ores.

The insufficient effectiveness of the indicated modifying reagents is mainly explained by the absence of specific complexing groups in their molecules capable of selectively interacting with metal cations included in the crystal lattices and of shared minerals.

Known N-oxide nitrilotrimethylene phosphonic acid, which is used as a complexing reagent for magnesium cations [5].

The purpose of the invention is to increase the extraction of valuable minerals and to reduce the concentration of harmful fosterite impurities in the concentrate.

This goal is achieved by the fact that as a modifier, N-nitrilotrimethylphosphonic acid N-oxide is used (ONK / Formulas

In the flotation of apatite from apatite-carbonate-silicate ore, it is technically difficult to separate apatite, calcite, and fosterite, which have similar flotation properties due to the fact that their crystal lattices contain alkaline earth cations.

Example. Flotation experiments using ONCs were carried out on the tailings of the '30 magnetic ore separation, which are apatite-carbonate-silicate ore. Tails contain apatite (15-18%) and related minerals as the main beneficial mineral: 35 calcite and other carbonates (8-25%), fosterite (15-20%), as well as phlogopite, pyroxene.

The experimental design was adopted on the basis of numerous studies performed at Mekhanobr, using hard-to-reach apatite-carbonate-silicate ores from the Kovdor deposit as an example. They included grinding the feed source to a particle size of 45% - 0.074 mm, treating ore with soda ⁴³ (to pH 10.2 - 10.3) with the proposed modifier, collector, which used distillite soap). In terms of MdO, its content decreases by 30% compared with the use of liquid glass. With an increase in reagent consumption, that. typical for modifiers with a depressing effect, apatite recovery is reduced. Compared with liquid glass, the consumption of ONC modifier reagent is reduced by more than 10 times. Obtaining a reagent is described in the literature. The reagent synthesis technique is simple. N-nitrilotrimethylene phosphonic acid M-oxide is obtained by oxidation of nitrilotrimethylene phosphonic acid with hydrogen peroxide.

The main starting material for the synthesis of this reagent is nitrilotrimethylene phosphonic acid, obtained from affordable and cheap products of ammonium hydrochloride, formalin and phosphorous acid.

Reagent synthesis. To a flask equipped with a stirrer, 14.95 g (0.05 mol) of nitrilotrimethylene phosphonic acid are charged and 18.13 g or 16.3 ml of 30% hydrogen peroxide (0.16 mol) are added with stirring. Stirring is continued for 11 hours. The reaction mass, initially quite thick, becomes liquid and mobile as the reaction proceeds. · Quantitative product yield. The resulting solution, whose activity is 46%, can be directly used in flotation. If necessary, the product can be isolated in crystalline form. For this, the aqueous solution is evaporated at room temperature or in a vacuum under mild heating until a viscous mass forms. The mass is treated 3 times with 10-15 ml methanol, then triturated with methanol, washed with acetone, filtered and dried in air.

The use of the proposed reagent does not require a change in the technological scheme, therefore, its implementation can be carried out in a short time.

distilled tall oil and ethanol ethanol ethanol (DS-3). The main and control flotations and four refining were carried out to obtain a conditioned apatite concentrate. All experiments were performed according to the principle of a continuous process. From the data obtained it follows that the optimal technological results using this reagent in comparison with the known liquid glass are achieved at a flow rate of 50 g / t. This consumption provides an increase in apatite recovery by 1.7%. In this case, a very significant factor is the decrease in the content of magnesium silicate in the concentrate (phosphate

Claims (2)

The invention relates to the enrichment of minerals by flotation and can be used in the flotation of apatite fluorite, barite and other non-sulphide ores. The enrichment indices nesulfide-. The ores are largely determined by the type of modifier. As it is known, in the enrichment of non-sulphide ores, mainly inorganic salts are used as reducing agents: liquid glass (sodium silicate), sodium silicofluoride, phosphates, chromates and bichromates G1, liquid glass in combination with aluminum salts 2. From organic compounds iz eest but used as modifiers of starch, destrin, sulfite-alcohol barite, carboxymethylcellulose (CCM), collagen-tannid solution 3, combination of tylose or starch with water-soluble urea-formaldehyde resins E4. . The most common modifier that is used in the flotation of almost all types of non-sulphide ores, individually or in combination with other reagents, is liquid glass. This is a cheap and affordable product. However, the listed modifier reagents have a number of disadvantages. Thus, the most common modifier — liquid glass does not differ in the selectivity of action; at high costs, it suppresses all minerals and most selectively acts only under steaming conditions. Organic depressors are most often polymers and as a result have a high cost (CMC), are produced from food raw materials and are unavailable in our country (starch), have a low selectivity of action (sulphite-alcohol) 1 bard), or their action is very limited (kllagen tannid reagent). None of the known reagents selectively, does not depress fosterite (magnesium silicate) - a harmful impurity of some types of ores. Lack of effective action. These modifier reagents are mainly explained by the absence in their molecules of specific complexing groups capable of selectively interacting with metal cations included in the crystal lattices and separated minerals. The nitrilotrimethylene phosphonic acid N-oxide is known, which is used as a complexing agent for magnesium cations 53. The purpose of the invention is to increase the recovery of valuable minerals and reduce the concentration of harmful impurity fosterite in the concentrate. The goal is achieved by the fact that N-oxide nitrilotrimethylephosphonic acid (RNA) of the formula; and fosterite having similar flotation properties due to the fact that alkaline earth cations are contained in their crystal lattices. For example, flotation experiments with the use of POC were carried out on the tailings of magnetic separation of ores, which are apatite-carbonate-with leaved ore. The tails contain apatite (15–18%) and concomitant as the main mineral: calcite and other carbonates (8–25%), fosterite (15–20%), as well as phlogopite, pyroxene. The scheme of experiments carried out on the basis of numerous studies carried out in the Mechanobr, by the example of the hardly-refractory apatite-carbonate-silicate ores of the Kovdorskoe deposit -. They included grinding the initial feed to a particle size of 45% - 0.074 mm, treating the ore with soda (to a pH of 10.2 - 10.3) with the proposed modifier, a collector, which used distilled tall oil soap and ethoxylated alcohol, antanol (DS-3) Main and control flotations and four cleanings were carried out to obtain conditioned apatite concentrate. All experiments are based on the principle of a continuous process. From the obtained data it follows that the optimum technological results with the use of this reagent in comparison with the known liquid glass are achieved at its consumption of 50 g / t. This consumption provides an increase in the recovery of apatite by 1.7. A very significant factor is the decrease in the content of magnesium silicate (fosterite) in the concentrate. In terms of MDO, its content is reduced by 30% compared with the use of liquid glass. With increasing reagent consumption, that. characteristic of modifiers with a depressant effect, the recovery of apatite is reduced. In comparison with liquid glass, the consumption of the PMC modifier reagent is reduced by more than 10 times. Reagent preparation is described in the literature. The method of synthesis of the reagent is simple. -Nitrilotrimethylene phosphonic acid is produced by the oxidation of nitrilotrimethylene phosphonic acid with hydrogen peroxide. The main starting material for the synthesis of this reagent, nitrilotrimethylenephosphonic acid, is obtained from affordable and cheap products of ammonium hydrochloride, formalin and phosphorous acid. Synthesis of reagent. 14.95 g of CO, O5 mol) nitrilotrimethylene phosphonic acid, are charged into a flask equipped with a filter and 18.13 g or 16.3 ml of 30% hydrogen peroxide (0.16 mol) are added with stirring. Stirring is continued for 11 hours. The reaction mass, initially rather thick, becomes liquid and mobile as the reaction proceeds ... The product yield is quantitative. The resulting solution, whose activity is 46%, can be directly used during flotation. If necessary, the product can be isolated in crystalline form. For this, the aqueous solution is evaporated at room temperature or under vacuum with little heating until a viscous mass is formed. The mass is treated 3 times with methanol 10-15 ml, then triturated with methanol, progulivaet acetone, filtered and dried in air. The use of the proposed reagent does not require a change in the technological scheme, so its introduction can be carried out in a short time. Claims of the invention. The use of nitrilotrimethylene phosphonic acid oxide of the formula CH, RO3 H2 as a modifier for the flotation of non-sulfide ores. Sources of information taken into account in the examination 1. M. Eygel's Reagents - regulators in the flotation process. M., Nedra, 1977, p. 87-89. 59883446 2. Mokrousov, V.A. Enrichment of rock- 4. USSR author's certificate of cyto-fluorite ores by flotation at 276848, cl. At 03 D 1/02, 1970. Alt-line salt change. 1945, 5. Kabanchik M.I. et al. New Lumpy Jurygsh, No. 9, p. 27-30. Flexo reagents and phosphorus 3. Author's certificate of the USSR, All-Union Chemical Society: No. 309741, cl. In 03 D 1/02, to them. Mendeleev, 1968, v. 13, p. 519 1971. (prototype). organic complexons. - Journal