CZ10308U1 - Agent for flotation of coal sludges and suspensions with controlled selectivity, efficiency and foaming - Google Patents

Description

Technique Area

The utility model relates to the definition of a new generation of flotation agents intended for both flotation and 5 reflotation of coal sludge and slurries with variable volume composition, variable ash content and different flotability.

Background Art

The composition of hitherto used reagents for flotation of coal sludge and suspensions satisfies completely the technologies of flotation of raw coal sludge, resulting from primary wet sorting from coal mining coal. These reagents consist of one component (ie. chemical individual / foaming agent and one collection / hydrophobic component.

The objective need for recycling coal substance from outdoor reservoirs / tailing ponds, which contain large volumes of fine-grained and high-ash waste sludge, has required the use of modified, multi-component flotation agents which, due to poor input quality, need to increase the selectivity of the reflotation process and simultaneously reduce the phenomenon of foaming. flotation products and returnable process water. Agents meeting the technological requirements for the flotation of raw coal sludge usually do not meet the basic technological requirements of refuse sludge / sludge sludge / and vice versa reagents meeting the refining requirements of the technological requirements, show inefficiency in flotation of coarser and low-ash crude sludge, ie lower flotation yield concentrate and higher loss of coal substance in flotation tailings.

For operational and economic reasons, flotation lines of coal treatment plants need to process any coal sludge with maximum photoconcentrate yield at the commercially desirable ash content and at the same time with maximum ash content of flotation tailings.

Only a newly modified flotation agent with uncontrollable selectivity and efficiency with sustained reduced foaming of the flotation products and return water can meet this requirement.

The essence of the technical solution

The aforementioned disadvantages of the present composition and effect of flotation agents for flotation and reflotation of coal sludge and slurries are removed by the flotation agent according to the invention, characterized in that it consists of a collecting component consisting of a mixture of liquid hydrocarbons boiling in the temperature range 180 - 370 ° C, together with the addition of carboxylic acids having carbon numbers in the hydrocarbon chain C] 4 - Cis in a mixing weight ratio of 2: 1-9: 1 to the foaming component comprising an aliphatic alcohol having carbon numbers of the hydrocarbon radicals of C ₆ - _C, wherein the weight ratio of the collector and the foaming ingredient is 3: 1 to 9: 1

Examples of technical solutions

Example 1 (commonly used flotation agent)

Sample of the mixture of primary and secondary coal sludge from coal treatment plant 9 May Stonava, whose grain size was 54.68% below 0.063 mm and 5.23% above 0.5 mm, the ash content was 18.15%, was subjected to foam flotation in mechanical flotation pulp with concentration of 100 g.dm ^'3, aeration mash 120 dm ³ .m ² .min ^-1 for 5 minutes.

It was dosed into the mash flotation agent commonly used in an amount of 800 g.ť ¹ whose composition was:

-1 CZ 10308 Ul% by weight, mixture of liquid hydrocarbons, boiling in the range of 180 - 370 ° C 13% by weight, isobutanol synthetic, technical 11%, food grade ethanol, 95% by weight 9%, 2-ethylhexanol-octanol ₅ - 100% by weight total.

Flotation gave a flotation concentrate with a mass yield of 81.89%, its ash content was 7.15% A ^d and flotation tailings whose ash content was 69.00% A ^d . The yield of the useful component, i.e., the combustible, in the concentrate was 92.90%.

Example 2 (flotation agent according to the invention)

The same sample of the primary and secondary sludge mixture as in Example 1 was flotated under the same conditions as in Example 1, only the floatation agent was altered to the nature of the technical solution:

% by weight, a mixture of liquid hydrocarbons, boiling in the range of 180 - 370 ° C 15 20% by weight, carboxylic acid - C ₁₇ H ₃₃ COOH% by weight, 2-ethylhexanol-octanol

100% by weight total.

Flotation gave a flotation concentrate with a yield of 85.93% and its ash content

8.99% A ^d and flotation tailings whose ash content was 78.42% A ^d . The yield of the usable component, ie combustible, in the concentrate was 95.55%.

Example 3 (commonly used flotation agent)

The sample of raw slag sludge from the ČSM Stonava Mine Treatment Plant, whose grain size was 35.40% below 0.063 mm and 19.70% over 0.5 mm, the ash content was 15.84%. was subjected to foam flotation in a mechanical flotator at a concentration of 100g.dm &^lt; ^{3 >} m, for 5 minutes at 120 dm ^{< 3 >} m ' A conventional 800 g flotation agent, the composition of which was identical to that of Example ¹ , was fed to the mash.

Flotation gave a flotation concentrate with a yield of 87.40% and its ash content

7.12% A ^d and flotation tailings whose ash content was 74.01% A ^d . The yield of the useful component, i.e., the combustible, in the concentrate was 96.45%.

Example 4 (flotation agent according to the invention)

The same sample of crude slag sludge as in Example 3 was flotated under the conditions corresponding to Exemplary Embodiment 3, only the floatation agent was changed whose composition corresponds to the essence of the technical solution:

% by weight, a mixture of liquid hydrocarbons, boiling in the range of 180 - 370 ° C 25% by weight, carboxylic acid - C ₁₇ H ₃₃ COOH 25% by weight, 2-ethylhexanol-octanol

100% by weight total.

Flotation gave a flotation concentrate with a yield of 89.16%, its ash content was 6.65% A ^d, and flotation tailings whose ash content was 80.49% A ^d . The yield of the useful component, i.e., the combustible, in the concentrate was 98.90%.

The technological results of the exemplary embodiments show a higher effect of the flotation agent according to the technical solution for both the flotation of raw (primary) and mixed (primary and

-2CZ 10308 U1 secondary) of lignite sludge which has been flotation products.

achieved with the desired low foaming power

Claims (1)

Claims for PROTECTION An agent for the flotation of charcoal sludges and suspensions with controlled selectivity, efficiency and foaming, characterized in that it consists of a collecting component consisting of a mixture of liquid hydrocarbons boiling in the temperature range of 180 to 370 ° C together with the addition of carboxylic acids having carbon numbers in the hydrocarbon chain-C C _M [g in a weight ratio of 2: 1-9: 1 to the foaming component comprising an aliphatic alcohol having a carbon number of hydrocarbon radicals Cn to C, wherein the weight ratio of the collector and the foaming ingredients is from 3: 1 to 9: 1st