| section Home Production, Amateur Radio amateur Model aircraft, rocket- Useful, entertaining | Stealth master Electronics Physics Technologies invention | space Mystery Earth Mysteries Secrets of the Ocean Stealth section Map |   |
| Use of material is permitted for reference (for websites - hyperlinks) | |||
Navigation: => | Home / Products Patents / In the section of the catalog / back / |
|
INVENTION
Russian Federation Patent RU2075521
METHOD OF EXTRACTION OF METALS
MELT FROM WASTE PRODUCTION titanium tetrachloride
Name of the inventor: Kudryavsky YP .; Freidlina RG .; Bondarev EI .; Yakovenko BI
The name of the patentee: AOS "Avisma" Titanium-Magnesium Plant "
Address for correspondence:
Starting date of the patent: 1993.08.16
The invention relates to a process for recovering metals from spent leach melt production of titanium tetrachloride to obtain a solution of the chloride from solution by precipitation of hydroxides, chrome, rare and radioactive metals, sediment treatment with sodium hypochlorite, separation of rare metals of the concentrate from a chromate solution. SUMMARY: chromate solution was mixed with the chloride solution in the ratio 1: 1-2 hydroxides after separating the precipitate and the resulting slurry is introduced into the alkaline agent to pH 6-9.
DESCRIPTION OF THE INVENTION
The present invention relates to the field of non-ferrous metallurgy and can be used for recycling and waste disposal processes, chlorination of titanium-containing concentrates.
In the preparation of titanium tetrachloride produced significant amounts of waste containing sodium, potassium, magnesium, calcium, aluminum, titanium, zirconium, scandium, thorium, niobium, tantalum, vanadium, iron, chromium, manganese, carbon, silicon and OE Basically all metals They are in the form of chlorides, easily soluble in water.
With existing methods of processing all the valuable components in the waste are irreversibly lost and irreparable damage to the environment due to pollution readily soluble, highly toxic industrial waste.
Known method of extracting metals from waste titanium production [1] are as follows. Exhaust chlorinators molten titanium is poured into water, concentrated by circulation, is then treated with lime milk.
The disadvantages of this method are -education silnozasolennyh wastewater containing sodium chloride, potassium, calcium, magnesium; production of metals concentrate in the form of oxides and hydroxides, further processing is difficult.
When such waste can not be disposed of valuable components such as chromium, iron, manganese, scandium, etc. And their only partial neutralization occurs due to the formation of sparingly soluble metal oxides and hydroxides.
Second, the formation of highly concentrated chloride solutions containing 200-250 g / dm3 salt which, after mixing with other effluents discharged into the water pool (at p. Kama).
 |  |
Of the known analogues closest to the claimed method of the combination of features is a known method of extracting metals from waste titanium production [2] PROTOTYPE. prototype (1) The method comprises the steps of: leaching waste water melt; deposition of chromium, rare and radioactive metals with an alkaline reagent to produce a rough chrome concentrate (CHHK); -Department of CHHK chloride solution; -Handling CHHK alkaline solution of sodium hypochlorite; separation of rare metal concentrate from the chromate solution; chromate processing solution to form chromium containing inorganic pigments such as chromium phosphate, lead and svintsovomolibdatnye Kroon.
The disadvantages of this method are:
- complexity and multistage chromate processing solution, and therefore the known method can be used and currently recommended to implement the processing of relatively small amounts of generated solutions;
- Use for the processing of chromate solutions deficit and at the same time, toxic lead compounds, which consequently creates additional difficulties related to the organization of jobs apparatchiks, and the difficulties associated with the prevention of ingress of lead compounds in the waste (sewage, washings) water.
These flaws are due to a number of reasons. According to the technology of using pigments provides significant excess acid, resulting in the formation of acidic solutions. Secondly, the use of highly toxic lead compounds and in addition (VI) results in a limitation of their use.
The claimed technical solution aimed at solving the problem is to eliminate the above drawbacks of the known method, simplifying the technology and to ensure the conditions for the creation of low-waste technology of waste disposal and recycling of valuable components in the form of commercial products and / or intermediates.
This problem is solved by the proposed method of extracting metals from waste titanium production, the essence of which is expressed by the following set of essential features: -vyschelachivaniem waste melt; precipitation from a solution of chromium and rare radioactive metal with an alkaline reagent; -separated chloride solution and sediment; -Handling precipitate an alkaline solution of sodium hypochlorite; filtration slurry separation rare metal concentrate from the chromate solution.
Distinctive characteristics and include: mixing and chromate chloride solutions in the ratio 1: 1-2; processing solutions after mixing with an alkaline reagent to pH 6 9.
In principle, the technological scheme of extraction of metals from the waste production of titanium is shown in Figure 2.
The sequence of operations, the ratio of reactants and pH values during extraction of metals due to the following.
The ratio of chloride and chromate solutions when mixed chosen from the following considerations. Chromate solution contains up to 6 g / dm 3 of chromium (VI) in the form of sodium chromate or dichromate, 60 10 3 times the maximum permissible concentration (0.1 mg / dm 3) waters households. drinking and household water, or 60 10 5 times for fishery reservoirs (MCL = 0.001 mg / dm 3). Chloride solution after separating the precipitate of chromium hydroxide, rare and radioactive metals contain, g / dm 3: iron (II) 25-40; iron (III) 0,5-1,0; manganese (II) 3-8.
Thus, by mixing solutions of a mutual neutralization of the solutions and the corresponding formation after treatment with an alkaline reagent iron-chromium-manganese concentrate. With respect to a chromate solution of the chloride is less than 1 there is no complete clearance from the solution of chromium (VI), which upon subsequent treatment with an alkaline reagent remains in solution. When the ratio is no more than 2 neutralization chloride solutions of iron and manganese.
Range pH 6-9 with an alkaline reagent treatment is because at a given pH value in the maximum precipitation of chromium compounds, iron and manganese. At a pH of less than 6, there is an incomplete precipitation of manganese compounds, and at a pH greater than 9 observed overruns alkaline reagent and waste dumping overbased becomes necessary to neutralize them until pH 6-7.
Thus, compared with the known method in the implementation of the process according to the proposed method there is a mutual neutralization of solutions and recycling of components in its entirety to obtain commercial products and / or intermediates and to create conditions wasteless technology titanium processing waste.
An analysis of patent and scientific and technical documentation suggests that the sources of information not found the description of the methods, similar proposals and coincident with the claimed technical solution the essential features.
Analysis of the art in respect of aggregate of essential features of the claimed technical solution shows that the proposed method meets the criterion of novelty.
To verify compliance with the claimed invention, the requirement of inventive step in relation to the essential features indicates that the process should not be explicitly from the prior art.
Detailed Description of the invention shown in the examples.
Example 1 (according to the known prior art method)
Exhaust melt is leached in water at a L: S = 2: 1 and the insoluble residue was separated from the solution. The resulting solution contains g / dm 3: Fe 35,7; Cr 2,9; Mn 7,3; Na 83,6; Mg 0,67; Al 1,3; Ti 0,2; Zr 0,46; Sc 0,04 and others. 1 L solution was treated with 2N. sodium hydroxide to pH 4,5. At the same time we received 58 g of metal hydroxide sludge (chromium, rare and radioactive) and humidity of 75 1.08 dm3 chloride solution composition, g / dm 3: 28,7 Fe; 6,5 Mn; 80,2 Na. Rough chrome concentrate composition weight. 5 Cr; 6 Fe; 0,07 Sc; 2,2 Al; 75 H 2 O was treated with an alkaline solution of sodium hypochlorite in an amount of 200 ml at a temperature of 90 o C. After the introduction of 0.2% PAA solution was filtered pulp. Obtained 250 mm chromate solution with the mass concentration of Cr (VI) 7,8 g / dm 3 and 30 g of rare metals of the concentrate (RCC), RCC humidity 70% used for extraction and preparation of individual compounds of scandium.
Chromate solution used for chromium pigments such as lead cron. To this solution was injected in 1 ml of sulfuric acid was heated to 30 o C, were introduced 15.5 g of lead salts (nitrate or acetate), the slurry pH was maintained 3.0-3.5. As a result of the synthesis obtained 17.8 g lemon krona ended PbCrO 4 · 0,5 PbSO 4.
Thus, the implementation of the process takes place in a known manner and extracting only the concentration of chromium compounds, wherein the use of scarce and toxic reagents.
Example 2 (according to the proposed method)
Leaching waste melt, the precipitation of chromium CHHK treatment to produce a chromate solution and rare metals of the concentrate are similar to the Example 1.
Chromate solution composition given in Example 1 was mixed with the chloride solution. Upon mixing these solutions in the ratio 1: 0.5 degree of neutralization solution was 60% chromium When the chromate solution and the ratio of chloride of 1: 2.1 there is complete neutralization of the solution of chromium (VI) to the MAC rules, a ratio> 2, there is an incomplete neutralization of manganese.
The resulting mixture produced solutions containing in g / dm3: at a ratio of 1: 1 3,9 Cr; 3,2 Mn; 14,3 Fe, in a ratio of 1: 2 2,6 Cr; 4,3 Mn; 19,1 Fe.
In the subsequent processing of the solution of sodium hydroxide precipitates are formed, the composition of which is given in the table.
As can be seen from the data obtained at pH <6 does not fully removed from, the solution pH at iron and manganese> 9 does not change the composition of the precipitate.
When mixing chromate and chloride solutions occurs their mutual neutralization to obtain an iron-chromium-manganese concentrate that can be used to produce catalysts and / or sorbents, and / or pigments.
The remainder of the chloride solution is processed in a known manner to give iron oxyhydroxide and manganese dioxide.
Thus, the proposed method of extracting metals from waste titanium production technology simplifies disposal of toxic metals and to ensure conditions for the creation of non-waste technology recycling with recycling of valuable components in the form of commercial products and / or intermediates.
CLAIM
1. A process for extracting metals from waste melt production of titanium tetrachloride comprising the chloride leaching to obtain a solution, precipitation from a solution of chromium, and radioactive metals of rare alkaline reagent, separation of the chloride solution and the precipitate of chromium hydroxides, rare and radioactive metals, treating the residue with an alkaline solution of sodium hypochlorite , filtering the slurry, the separation of rare earth concentrate from a chromate solution, its subsequent processing, wherein the processing chromate solution lead by mixing it with the chloride solution after separation of the precipitate of hydroxides of chromium, rare and radioactive metals and introducing the resulting pulp alkaline agent to pH 9 June .
2. A method according to claim 1, characterized in that the chromate solution is mixed with sodium chloride in a ratio of 1: 2.1.
print version
Publication date 15.03.2007gg
Comments
Commenting, keep in mind that the content and the tone of your messages can hurt the feelings of real people, show respect and tolerance to his interlocutors, even if you do not share their opinion, your behavior in terms of freedom of speech and anonymity offered by the Internet, is changing not only virtual, but real world. All comments are hidden from the index, spam control.