| 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 RU2025522
METHOD FOR PROCESSING OF SOLID WASTE COPPER TSIANSODERZHASCHIH
Name of the inventor: Parkhomenko VD .; Brewers AA .; Barsky VD .; Fedulov OV .; Sytnik S.
The name of the patentee: Dnepropetrovsk Institute of Chemical Technology
Address for correspondence:
Starting date of the patent: 1991.02.27
Use: the technology of enrichment of non-ferrous metals, in particular recycling of waste tsiansoderzhaschih. The inventive copper tsiansoderzhaschih processing solid waste beneficiation process non-ferrous ores by heat treatment are waste in an inert atmosphere at 600-1000 ° C until complete separation of cyanogen in the gas phase and the gas phase obtained residue containing copper are separated, the latter implementing the consumer, and gas phase is fed to contacting the catalyst with an aqueous solution containing 0.3-5.0 wt.%, copper acetate and 0.3-3.0 wt.% stabilizer at 40-90 ° C and pH 1-3 to obtain the medium oxamide and selling it to the consumer. In an inert atmosphere for heat treatment is nitrogen, argon, helium or without heat treatment are air. The inert gas is introduced in a volume ratio in the gas phase formed 0.1-0.3. The contacting is carried out at a gas contact time with the catalyst of not less than 2 seconds. As the stabilizer, a compound from the group of alkali metal halides, divalent metal oxides, pH is maintained by introducing a catalyst solution of nitric acid.
DESCRIPTION OF THE INVENTION
The invention relates to the enrichment of non-ferrous metals, in particular of waste disposal tsiansoderazhschih. The most effective invention can be used in the mining, metallurgical and coking industry waste for disposal tsiansoderzhaschih.
A method of processing waste tsiansoderzhaschih by high-temperature decomposition, wherein the thermolysis is carried out in an oxidizing atmosphere (air atmosphere). As a result of the decomposition is formed CuCN Cu, which has a catalytic effect on the decomposition of other cyanide - NaCN, KCN, Zn (CN ) 2, Na 4 Fe (CN) 6 with a higher temperature thermolysis.
The disadvantage of this method is the presence of non-utilized in the gas phase, polluting cyanide.
The closest to the proposed invention as to technical essence is a method for processing solid tsiansoderzhaschih complex salts tsiansoderzhaschih extracted from sewage.
This method is based on the thermal decomposition of solid residues in an oven at a temperature above 400 ° C to release the cyanide in the gas phase. The resultant mixture was heated gas is directed into the furnace for incineration at 550 ° C, where the degree of degradation of cyanogen is 100%.
The main disadvantages of this process are the impossibility of recycling to produce a commodity product and the high cost of the process, t. To. Irretrievably lost tsiansoderzhaschee raw materials.
The aim of invention is to provide opportunities for utilization of products as commercial products.
This is achieved by a method of processing solid waste copper tsiansoderzhaschih comprising them tsiansoderzhaschey heat treatment to obtain a gas mixture and a solid residue, wherein the heat treatment is carried out in inert atmosphere at 600-1000 ° C until complete separation of cyanogen in the gas phase, the gas phase was obtained and a solid residue containing copper, is separated, the latter implementing the consumer, and a gas phase is fed to contacting the catalyst with an aqueous solution containing 0.3-5.0 wt.% copper acetate and 0.3-3.0 wt.% stabilizer, at about 40-90 C. and pH 3.1 to yield oxamide and sale to the consumer.
In this case, as the inert medium is used for the heat treatment inert gas selected from the group consisting of nitrogen, argon, helium or without heat treatment are air. The inert gas is introduced in a volume ratio of gas phase to 0.1-0.3 released.
As used stabilizer compounds selected from the group of alkali halides. Thus the pH is adjusted by adding an aqueous solution of nitric acid.
The essence of the method is that carrying out waste recycling, containing up to 96% cuprous cyanide, in the inventive technology it is possible to ensure obtaining commercial products as metallic copper and oxamide which can be used for chemical and agricultural purposes.
It is experimentally determined parameters and conditions of heat treatment steps, which are obtained as a result of metallic copper, having no impurity cyanide and the gas phase comprising cyanogen in an amount effective for further processing into a salable product.
Stage of processing gas phase is to translate cyan in oxamide according to the reaction 
To implement this step, oxamide with a high yield (~ 98%) developed a catalyst consisting of an aqueous copper acetate solution in admixture with a stabilizer and experimentally chosen process conditions (temperature, pH).
As a result of the proposed technology it is possible to provide a high selectivity for desired products of the process and the gas phase rejection does not contain harmful impurities and cyanogen.
When conducting research on the application is not established well-known use of the proposed methods and reagents for the recycling process with the solution of the problem, which makes the proposed technical solution meets the criteria of the invention.
Example 1. The quartz reactor with a diameter of 0.025 m and a length of 0.40 m at a temperature of 800 ° C was immersed ceramic crucibles, which contains a mass of waste tsiansoderzhaschie 6.02 g, containing about 95% copper cyanide (I), and other organic impurities. As a result of the thermal decomposition in a nitrogen atmosphere, taken with respect to the gas phase released 0.1, and metallic copper formed continuously withdrawn tsiansoderzhaschaya gas phase. The time required for the complete decomposition of cyanide copper, was 1080. Weight of copper 4.19 g, weight 1.71 g cyanogen
The resulting gas phase with a predominant content of cyanide to the reactor is made of glass pipe d = 0,025 m and h = 0,4 m in the lower part containing bubbler to evenly distribute the disperse phase throughout the reaction volume of catalyst and 100 ml of a solution containing 1 25% of copper acetate and 1.0% potassium fluoride. Nitric acid solution adjusted to pH 2. After 30 minutes after completion of the reaction the precipitate is separated, washed with water to give 2.83 g of oxamide (98% based on the cyanogen). The following table (Examples 2-5) shows the results of the processing of solid waste tsiansoderzhaschih copper to obtain copper and oxamide.
The following advantages can be obtained by carrying out the claimed method:
- ensures efficient processing of toxic waste to produce marketable products - copper and oxamide, which can be sold to the consumer, and are implemented in economic activity;
- oxamide is obtained a long-acting nitrogen fertilizer.
CLAIM
1. METHOD FOR PROCESSING SOLID WASTE COPPER TSIANSODERZHASCHIH comprising them tsiansoderzhaschey heat treatment to obtain a gas mixture and a solid residue, characterized in that, in order to provide opportunities for utilization of products as commercial products, heat treatment is performed in an inert atmosphere at 600 - 1000 o C or without access of air to the complete separation of cyanogen in the gas phase and the gas phase obtained residue containing copper are separated, the latter implementing the consumer, and a gas phase is fed to contacting the catalyst with an aqueous solution containing 0.3 - 5.0 wt. % Copper acetate and 0.3 -. 3% by weight stabilizer at 40 - 90 o C and the medium pH 1 - 3 to obtain oxamide.
2. A method according to claim 1, characterized in that as the inert medium is used for the heat treatment inert gas selected from nitrogen, argon, helium.
3. The method of claim 1, wherein the inert gas is introduced in a volume ratio of gas phase produced 0.1 - 0.3.
4. A method according to claim 1, characterized in that as stabilizer a compound selected from the group consisting of alkali metal halides, divalent metal oxides.
5. The method of claim 1, wherein the pH is maintained by introducing a catalyst solution of nitric acid.
print version
Publication date 19.02.2007gg
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.