A method of processing clay-salt sludge production of chloride salts

 

The invention relates to the field of metallurgy of non-ferrous metals, more specifically to the field of obtaining gold and silver from clay-salt sludge generated by the processing of chloride raw material alkali and alkaline earth metals, mainly sylvinite, carnallite and halite. A method of processing clay-salt sludge production of chloride salts include water washing sludge from chloride to remove salt solutions, the translation of the gold chloride solution and sorption of gold. Shaded chlorides lead to a residual content of chlorine in the range from 3 to 7%, the washed sludge is subjected to thickening, drying, sintering and heat treatment during continuous heating to 1000-1150oC and the oxygen content in gases heat treatment in the range of 13-16% and maintained at this temperature until a treated material with a chlorine content of not more than 0.3%, and the gas phase heat treatment process cooling, condensation and absorption by washing with the release of condensate solid chlorides and pulp absorption leaching with subsequent sorption of gold from the pulp. While the washed sludge is thickened by sedimentation and/or filtration, drying condensed washed slurry is conducted to a residual moisture content of formovaniem. When using work drying and pelletizing is carried out in one unit. Absorption pulp before sorption subjected to filtration with a selection of cake containing silver. The method provides improved recovery of gold and silver in the gas phase and the solid residue in the form of burnt okuskovannogo material used for manufacture of building materials. 5 C.p. f-crystals, 3 tables.

The invention relates to the field of metallurgy of non-ferrous metals, more specifically to the field of obtaining gold and silver from clay-salt sludge generated by the processing of chloride raw material alkali and alkaline earth metals, mainly sylvinite, carnallite and halite.

The most promising reserves from known sources of chlorides of potassium, magnesium and sodium is the Verkhnekamskoe (Perm region ). When processing of ore from this Deposit gallerycheck and flotation methods are highlighted clay-salt slurries, wastes of production. About 90% of the total amount of sludge is obtained in the processing of sylvinite ore flotation method. After refining clay-salt slurries are partly used for bookmarks mountain via phase of the slurry is mineralizovannyh brine (200 g/l), containing, in mass%: 10-11 KCl and 20-22 NaCl, and after settling poured into a separate settling tank for further use in technology as the conveying fluid. The solid phase after separation from the brine is a mixture of residual chlorides and clay and contains, depending on the composition of processed raw materials and the technology used, % by weight: 19-28 KCl, 14-24 NaCl, 0.3 To 13 MgCl2, 0,06-0,13 l2. The clay component of the sludge contains, in mass%: 3.5 to 16 Cao, MgO 3-5, 1,5-4 Fe, 1-8 S, 2-7 Al2O3, 13-32 SiO2. In addition, the sludge contains gold and silver in their grades 1-6 respectively and 0.2-0.4 g/T. Noble metals confined to the clay component of the sludge and are in the form of dispersed metal particles of gold mixed with silver (about 10% of their total content) and in the colloidal form (about 90%). The total chlorine content in the sludge is from 14 to 30 percent water of crystallization and hygroscopic forms - from 30 to 50%, water-insoluble residue from 24 to 40%. To date, the settlement only three mining OJSC "Uralkali" has accumulated more than 30 million tons of sludge, covering an area of approximately 200 hectares of former farmland. The question of the disposal of sludge to date do not address the substance. - M.: Chemistry, 1984, 352 S.) that, if from clay-salt slurry to remove soluble salts and most of the water, its composition is close to the composition of the clay-carbonate-anhydrite marls, which are good raw materials for production of construction materials (cement clinker, brick and ceramics, clay, apophoreta, building glass, stone casting, ceramics and so on). Our research showed that the sludge washing water does not completely remove chlorine from the insoluble residue, residual chlorine content is from 1.5 to 2%. It is known that the presence of chlorine greater than 0.3% reduces the corrosion resistance of construction products to atmospheric effects in middle and high latitudes, therefore, the application of the washed sludge in the production of building materials for the regions of the Urals and Siberia requires further reduce chlorine.

You can use sludge as intensifiers hardening and plasticizers mortars as fillers porous rubber substitutes mud during drilling, as well as in agriculture for inclusion in poor, sandy, sandy loam and peat soils. However, none of the methods of utilization of clay-salt sludge is not arnosti, dispersion and high viscosity.

As for precious metals, their extraction from sludge traditional methods of beneficiation and hydrometallurgy irrational because of the high chlorine and low scrivetemi colloidal gold enclosed in the amount of particles of clay component of the sludge. In addition, these methods do not solve the problem of utilization of the main mass of the sludge.

The closest analogue of the invention is a method for processing sludge potash production (Papulo L. M., Nikolaev A. C., Belkin Century. Century. and other Method for processing sludge potash production. RF patent 2132397, 1998. Bull. inventions 18, 1999, S. 393) by the washing of soluble salts with water, removal of the leaching solution, add in the washed slurry of fresh water followed by treatment of the pulp washed sludge with gaseous chlorine in its activity in solution of 0.3-2.0 g/l and extract gold from the pulp adsorption. According to the example closest analogue consumption of fresh water on the raspulpovka washed sludge (1,17 g/t gold) before treatment with chlorine amounted to 100% by weight of the slurry. Recovery of gold from the washed sludge in the solution after treatment with chlorine (0.6 mg/l of gold) was equal to 51.3%, the gold content in the sorbent (anionite AV-17-8) Palaeogene - chlorine gas; - increased water consumption for raspulpovka sludge washed out from soluble salts; - a significant amount of pulp being processed chlorine and sorption; - insufficiently high recovery of gold in the solution; - the impossibility of passing the recovery of silver.

The present invention is to provide a method that provides effective conditions for the extraction of gold and silver from clay-salt slurry by separating the precious metals in the gas phase. The technical result from the use of the invention is to increase the concentration of noble metals and their extraction during subsequent processing.

The technical result is achieved in that in the method of processing clay-salt sludge production of chloride salts, including water washing sludge from chloride to remove salt solutions, the translation of the gold chloride solution and sorption of gold, according to the invention shaded chlorides lead to a residual content of chlorine in the range from 3 to 7%, the washed sludge is subjected to thickening, drying, sintering and heat treatment during continuous heating to 1000-1150oC and the oxygen content in gases heat treatment in the range of 13-16% and maintained at autobody process cooling, condensation and absorption by washing with the release of condensate solid chlorides and pulp absorption leaching with subsequent sorption of gold from the pulp.

While the washed sludge is thickened by sedimentation and/or filtration, drying condensed washed slurry is conducted to a residual moisture content in the range of 25-30%, the sintering condensed and dried sludge is conducted by pelletizing, and/or briquetting, and/or molding. When using work drying and pelletizing is carried out in one unit. Absorption pulp before sorption subjected to filtration with a selection of cake containing silver.

The solid residue heat treatment in a burnt okuskovannogo material used for the production of building materials. In addition, the advantages of the proposed method are: no use of toxic reagent chlorine gas; the cost reduction process water.

Data confirming the possibility of carrying out the invention are illustrated by the following examples.

Example 1. The pulp of the clay-salt sludge from flotation processing of sylvinite ore with the ratio of liquid to solid (W:t), is equal to 2, is subjected to thickening and sedimentation, separated brine, Shushensky diagram of the processing of sylvinite ore, the washed sludge with a humidity of 50-70% dried at 100-150oWith to a moisture content of 25-30%, okomkovaniya drum okomkovatelej. Pellets with a residual chlorine content of from 2 to 9%, the gold content of 1.2 to 2.3 g/t silver and 0.2-0.3 g/t sent for heat treatment in a rotating tube furnace, heated by natural gas. The heat treatment of the pellets is carried out at continuous heating from a temperature of 100-150 up to 1000oIn preparation zone of the furnace, followed by holding at that temperature for 2 h in an isothermal zone of the furnace. Burning gas in counterflow furnace is carried out at a residual oxygen content in the combustion products, equal to 15 vol.%. The temperature in the furnace at high oxygen content in the combustion products support heated air to burn the fuel. The treated pellets analyzed for chlorine content, gold and silver. The exhaust gases are cooled to 300 500oWith a selection of solid condensate of sodium chloride, potassium and iron, cooled to 100-250oWith and washed with water in the absorber. The pulp washing gases analyzed by chlorine, gold and silver, filter, separate the cake. The solution is brought into contact with the sorbent (activated carbon). KEK, the solution to the sorbent sorption and analyze n is the GLA.1.

From the data table. 1 shows that when the content of chlorine in the original pellets less than 3% recovery of gold and silver in the gas phase is insufficient, and when the content of chlorine in the original pellets above 7%, the content of this element in the treated pellets exceed 0.3%. The pellets with the same chlorine content may not be used for the production of building materials. In addition, the extraction of gold and silver in the gas phase is also reduced due to sintering of the pellets. The treated pellets differed sufficient compressive strength (190-233 N/pellet) and shock (not less than 20 discharges from a height of 1 m without destruction), a density of 1.13 to 1.6 g/cm3that together with a low chlorine content makes them suitable for the production of building materials.

When filtering slurries of Assortie gases (PL.1) dedicated precipitates containing silver from 150 to 330 g/t with a recovery of silver from 93 to 95% of the content of this metal in the pulp. The gold content in the sorbent after the 48-hour contact of the solution with the sorbent was 0,94-1.7 kg/t gold extraction 97-98% (the amount of gold in the pulp absorption).

The processing results of example 1 in comparison with the closest analogue show that when the chlorine content in the washed sludge is in the range of 3-7% onespace 3.8-6.8 times;
additionally removing 47-64% of silver in the product (cake filtration pulp absorption of gases) industrial grade silver (150-330 g/t);
- an exception to the application of toxic reagent gaseous chlorine;
- reduction in 4-5 times the flow of water to obtain solution for sorption of gold through the use of water condensed during cooling of the gases heat treatment of the pellets.

Example 2. The pellets prepared according to example 1, with a chlorine content of 4.98% of treated also as in example 1. The oxygen content in the products of combustion in the furnace of change in the interval from 5 to 18 vol.%. The results of heat treatment of the pellets is presented in the table.2. They show that the highest figures for removing chlorine, gold and silver from the pellets is achieved in the interval content of oxygen in the products of combustion in the range of 12-16%.

Example 3. The pellets prepared according to example 1, with a chlorine content of 4.98% of processed according to example 1 with changing temperature isothermal zone tube furnace in the interval 920-1250o(PL.3). From the data table.3 shows that when the temperature of the isothermal zone below 1000oWith the degree of distillation, chlorine, gold and silver are reduced. The pellets contain more than what Atisha. At 1250oThe pellets are melted, naratiwas for lining a tubular furnace and disrupting its normal operation.

Example 4. From the slurry, washed to a residual content of chlorine to 4.98% and dried to a moisture content of 25-30%, roller briquette press the compression pressure of 450-500 kg/cm3cook oval pellets of the size 604030 mm Briquettes are subjected to heat treatment in example 1. Chlorine residual, gold and silver respectively to 0.25%, 0.16, and 0.15 g/t, and the degree of distillation respectively 96, 93,3 and 58,6%. The strength of the briquettes compression is within 1300-1599 N/cm2on strike - not less than 15 discharges from a height of 1 m the Gas phase process of example 1 to obtain a sorbent containing gold 1.25 kg/t, and cake filtration absorption pulp with a silver content of 250 g/so

Example 5. From the slurry prepared according to example 4 way plastic extrusion molded standard hollow building bricks of size 25012065 mm Bricks fired in a tunnel furnace under the regime of heat treatment as in example 1. Chlorine residual, gold and silver in the processed products are respectively the corresponding stamp 200. The gas phase process of example 1 to obtain a sorbent containing gold 1.57 kg/t, and cake filtration absorption pulp with a silver content of 280 g/so

Example 6. Clay-salt sludge production of carnallite and potassium chloride on gallerycheck technology, washed until chloride, respectively, 5,12 and to 4.52%, processed as in example 1. In the original pellets of gold content are respectively 2.5 and 1.8 g/t and silver - 0.35 and 0.27 g/t processing result receiving pellets with chlorine to 0.19 and 0.17%, gold - 0.05 and 0.03 g/t and silver - 0.15, and 0.14 g/T. In the processing of the gas phase produce sorbents with a gold content of 1.95 and 1,84 kg/t and cake filtration absorption pulp with a silver content of 380 and 420 g/T.


Claims

1. A method of processing clay-salt sludge production of chloride salts, including water washing sludge from chloride to remove salt solutions, the translation of the gold chloride solution and sorption of gold, characterized in that the washing of chlorides lead to a residual content of chlorine in the range from 3 to 7%, the washed sludge is subjected to thickening, drying, sintering and heat treatment during continuous heating to 1000-1150oAnd the content knogo material with a chlorine content of not more than 0.3%, the gas phase heat treatment process cooling, condensation and absorption of water by leaching with the release of condensate solid chlorides and receiving pulp absorption rinse containing chloride solution of gold.

2. The method according to p. 1, characterized in that the washed sludge is thickened by sedimentation and/or filtration.

3. The method according to p. 1, characterized in that the sintering is carried out by work and/or briquetting, and/or molding.

4. The method according to any of paragraphs.1-3, characterized in that the drying is carried out to a residual moisture content of 25-30%.

5. The method according to p. 3, characterized in that the drying and pelletizing combine in a single unit.

6. The method according to any of paragraphs.1-5, characterized in that the pulp absorption leaching is subjected to filtering with a selection of cake containing silver.

 

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