Method for complex processing of serpentinite

FIELD: chemistry.

SUBSTANCE: invention can be used to produce magnesium chloride, silica and red pigment. Serpentinite calcined at 680-750°C is treated with 4-8% hydrochloric acid solution with weight ratio of serpentinite to hydrochloric acid equal to 1:(15-40). The hot pulp is then decanted and filtered. The residue is dried to obtain silica, the filtrate is evaporated and silicic acid is separated. After separating silicic acid in form of sol-gel, hydrochloric acid is added to a solution containing magnesium and iron (III) chlorides until 4-8% hydrochloric acid solution is obtained. The obtained hydrochloric acid solution is used to treat a new portion of serpentinite. Further, the decantation, filtration, evaporation of filtrate, separation of silicic acid and treatment of the obtained solution with hydrochloric acid are repeated 3-5 times using new portions of calcined serpentinite. The solution concentrated that way at 90°C is mixed with serpentinite and filtered. Magnesium chloride is separated from the residue which contains iron (III) hydroxide. Said residue is treated at 350-400°C to obtain red pigment.

EFFECT: invention simplifies the processing serpentinite, improves environmental safety and reduces expenses and wastes.

1 dwg, 1 ex

 

The invention relates to the field of inorganic chemistry, in particular thermobalancing processing coexisting phases serpentinizing ultrabasic rocks to obtain silicon dioxide, magnesium chloride, pigment, and fine silica that can be used in the synthesis of nanocomposite materials, and special optical glasses, and as a filler in rubber and plastics, silicagel sorbents, catalysts carriers, forming substance in metallurgy, an integral part of the lacquer coating, plastics, linoleum, enamels, high-temperature fire-resistant paints, in the production of fine ceramic and refractory substances as raw materials for silicon, magnesium oxide, etc.

A method of processing serpentinites, which serpentinite calcined in the temperature range of 640-680°C, and then heat-treated serpentine treated at a temperature of 85-95°C for 3-5 min 5-8%solution of hydrochloric acid, when the serpentinite: hydrochloric acid =1:(11-20) wt., the relations. The hot slurry is immediately subjected to decantation and filtered. The result is a solution containing silicic acid, chlorides of magnesium and iron (III), where the average wt., the content of substances, calculated from oxides, %: SiO2- 0.68, MgO - 4.30, Fe2O3- 0.18. The filtrate slurry at a temperature of 0°C is evaporated, and silicic acid Sol-gel is separated and the solution of the chlorides of iron (III) and magnesium neutralized with lime water and at pH=7-7 .5 and 8-10 consistently separate the hydroxides of iron (III) and magnesium. The precipitate formed from desantirovanii mass is dried. He is a fine silica without solids, which has the following chemical composition in %: SiO2- 80, MgO - 12, R2O3- 8 [1].

The disadvantage of this method is incomplete process associated with incomplete acid due to the lack of closed-loop formation of dilute solutions after processing of serpentinites, the extension of chemical substances and processing methods for the separation of substances that lead to incremental energy and material costs.

The objective of the invention is to provide an environmentally friendly, cost-effective and easy to implement technological scheme of complex processing of serpentinites.

The invention consists in the following: serpentinite calcined in the temperature range 680-750°C, and then calcined serpentine treated at a temperature of 85-95°C for 3-5 min 4-8%solution of hydrochloric acid, when the serpentinite:hydrochloric acid =1:(40-15) wt., relations, receiving at a temperature of 85-95°C. the slurry, in rest the adopted parts of which are the chlorides of magnesium and iron (III), and silicic acid, and the insoluble part is amorphous silica and prosloennaya part of the breed. Then the slurry is decanted to separate amorphous silica from nerazlozhimoi part of the breed, and filtered. The filtrate on average has the following chemical composition calculated from oxides, %: SiO2- 0.72, MgO - 1.85, Fe2About3Is 0.27, which silicic acid is separated by a Sol-gel process, a solution of partially Shustov, and silica - SiO2- 82.95, MgO - 9.28, Fe2About3- 6.97.

After separation and washing of the gel to the solution of the chlorides of magnesium, iron (III) and hydrochloric acid add hydrochloric acid to obtain a 4-8%solution of hydrochloric acid, which again can be used for processing new portion of the heat-treated serpentine. This process is repeated 3-5 times. The final solution is treated by a new portion of the heat-treated serpentine. The result is a solution of magnesium chloride, and the residue, where the remains of the iron hydroxide (III), after processing at a temperature of 350-400°C turns into a red pigment.

Significant differences of the proposed method: over a large temperature range firing serpentinite (680-750°C), which provides a larger outputs the extracted substances, creating a closed cycle with no loss of hydrochloric acid and without the involvement of any other substances, the floor is placed pure solution of magnesium chloride, and red pigment.

Schematic diagram thermobalancing processing coexisting phases of serpentinites is given on the drawing.

The invention was tested in laboratory conditions, Jonha of NAS RA.

Example. Two hours of heat-treated at a temperature of 720°C 20 g of serpentinite and 340 ml of an 8%aqueous solution of hydrochloric acid with a ratio of t:W=1:17, mixing with a stirrer, a hold at a temperature of 90°C for 5 minutes, after which the resulting slurry in a hot condition immediately subjected to decantation and filtering the filtrate was separated from amorphous silica. The filtrate has the following chemical composition calculated from oxides, %: SiO2- 0.77, MgO - 2.12, Fe2About3- 0.36, which silicic acid is separated by a Sol-gel process, Shustov part of the solution. After separation the gel percentage of hydrochloric acid in the solution is reduced to 1.5-2.2%. Again the volume of solution bringing to 340 ml, and the concentration up to 7%, the above process is repeated for the second time. Then, repeating this process is still 2-4 times and each time separating silicic acid Sol-gel, the result is an enriched solution of the chlorides of magnesium and iron (III) with 1-2 .5%hydrochloric acid. This solution has the following chemical composition calculated from oxides, %: MgO - 10.5-11, Fe2About3- 1.2-1.5. The solution is mixed by the mixer is a new portion 20 g of serpentinite within 5 min at a temperature of 90°C, after filtering the slurry receive a clean solution of magnesium chloride. The precipitate, where the remains of the iron hydroxide (III) after processing at a temperature of 350-400°C, turns into a red pigment, in which Fe2About3comes to 15-16%.

Sources of information

1. Patent AM No. 1576 A2, 2005.

The method of complex treatment of serpentinites, in which the calcined serpentine, treated with hydrochloric acid, the hot slurry is decanted and filtered, the precipitate is dried to obtain silica, and the filtrate is evaporated, separated silicic acid Sol-gel, after which the solution containing the chlorides of magnesium and iron (III)is subjected to further processing, characterized in that the first calcined at a temperature of 680-750°C serpentinite handle 4-8%solution of hydrochloric acid at a mass ratio of serpentinite and hydrochloric acid 1:(15-40), and after separation of the silicic acid in the form of a Sol-gel in the solution containing the chlorides of magnesium and iron (III)add hydrochloric acid to obtain a 4-8%solution of hydrochloric acid, which is used for processing of a new portion of serpentinite, then stage decantation, filtration, evaporation of the filtrate, Department of silicic acid in the form of Sol-gel processing of the obtained solution of hydrochloric acid repeat 3-5 times, using the new batch of calcined serpentine, then close nirovany thus the solution at a temperature of 90°C is mixed with serpentinite, filter, separating the solution of magnesium chloride from the precipitate containing iron hydroxide (III), and the precipitate at a temperature of 350-400°C turn in red pigment.



 

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1 tbl

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2 cl, 5 tbl, 6 ex

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