1. The pH of the pulp
The pH value of the slurry has a great influence on the flotation of fluorite . When using oleic acid as the collector , the pH is 8-11, the floatability is good, and the recovery rate can reach 80-90%. When the pH is 6, the floatability is also good.
For different types of fluorite ore, the floatability of gangue minerals is also affected by the pH value, which affects the sorting effect. For example, when using oleic acid as a collector, the pH is 8~9.5. Both the stone and the calcite have good floatability.
2, the temperature of the pulp
Fluorite is usually floated with a carboxylic acid collector. Due to the high freezing point of the carboxylic acid, the slurry temperature has a significant effect on the flotation process. In a certain temperature range, the temperature increases, the solubility of the carboxylic acid in the pulp increases, and it is easy to disperse, thereby facilitating the full utilization of the collecting performance. The use of oleic acid in production is generally heated to 30 °C.
3, flotation granularity
Coarse-grade fluorite, high flotation selectivity, high grade and low recovery rate;
Medium-grade fluorite, high grade and recovery rate in flotation;
Fine-grained fluorite, flotation concentrate grade and recovery rate are low.
4, the quality of water
When fluorite is collected by oleic acid, there are Ca 2 + and Mg 2 + ions in the water. Studies have shown that the presence of Mg 2 + will seriously interfere with the flotation of fluorite, significantly reducing the flotation effect, so flotation Stone water needs to be softened beforehand.
Add sodium carbonate to soften the water.
5, flotation reagent
1 collector
The collector may be used as a collector of fluorite, such as hydrocarbyl sulfate, alkylsulfonated succinamine, sodium oleate sulfonate, and other sulfonates and amines;
2 inhibitor
Water glass is the most commonly used inhibitor for fluorite flotation. In order to improve the selective inhibition ability of water glass, water glass and soluble salts are combined into a combination inhibitor, or sulfuric acid is formulated into an acidic water glass in a certain ratio.
Soviet Union patent describes a fluorite calcite separated organic inhibitor, than sodium silicate, aluminum sulfate and sodium hexametaphosphate phosphate good effect.
H1010 is a mixing regulator composed of an acid, a base and a synergist. It can effectively separate fluorite from calcite and quartz .
NL, NS and NO3 inhibitors composed of water glass, aluminum sulfate, sodium sulfate and carboxymethyl cellulose are used for fluorite flotation in Shizhuyuan, and the effect is good.
6, other technical measures
(1) Branch flotation should be used in the fluorite flotation process
In order to adapt to the high-quality concentrate production and strengthen the effect of low-grade raw ore sorting, the branch flotation process has been adopted abroad, and the research on fluorite ore has proved that the index of the branch flotation process (concentrate contains CaF 2 95.8%, the recovery rate is 97.6 %) superior to direct flotation (concentrate containing 89% CaF 2 , recovery rate 97.8%).
(2) Fatty acid collectors are still the main agents for flotation fluorite. Therefore, how to improve its selectivity and ability to capture is still a way to strengthen fluorite flotation. The following measures are often used:
1) Strengthen mechanical stirring;
2) increase the temperature of the slurry;
3) oleic acid oil and coal mix (1/1);
4) saponifying oleic acid with an excess of soda (1:0.28), or emulsifiing oleic acid with a small amount of sodium carbonate (1:0.05);
5) Alkyl sulfate is used as a dispersing agent for the fat soap liquid.
Fluorite (CaF 2 ) contains F 48.9%, Ca 51.1% fluorite has good floatability, and fatty acids are often used as collectors. The pH of the pulp has a great influence on the flotation effect of fluorite. Using oleic acid as a collector, when the pH of the slurry is 8 to 11, the fluorite has better buoyancy. Secondly, raising the temperature of the slurry can also increase the flotation index of fluorite. At the same time, the flotation behavior of fluorite with different particle sizes is also different. The coarse-grained fluorite flotation is characterized by strong selectivity; therefore, its concentrate grade is high, but the recovery rate is low; the medium-grained fluorite flotation results in higher concentrate grade and recovery rate; fine-grained fluorite float The selected concentrate grade and recovery rate are both low. When flotation fluorite uses oleic acid as a collector, there is also a higher requirement for floating water. That is, when the water quality is hard water, the water entering the flotation process is first softened in advance.
Fluorite flotation collectors In addition to oleic acid, hydrocarbyl sulfates, alkylsulfonated succinamines, sodium oleoylsulfonate and other sulfonates and amines can be used as collectors for fluorite flotation. Commonly used sodium carbonate as a pulp conditioner. Depending on the nature of the gangue, water glass, sodium metaphosphate, lignosulfonate, dextrin, etc. can be used as the gangue inhibitor.
Injection Molding Machine For Auto Parts
The advantage of MYTAO press is that it can provide system solutions according to customers' product characteristics and quality requirements, including not only the whole machine system that adapts to different processes, but also mold design schemes to ensure product molding quality and provide high-quality injection molding machines. To enhance the core competitiveness of customer products
The plasticization of automobiles is a major development trend of the international automobile manufacturing industry today. The current automotive market demand has shifted to lighter sports utility vehicles, minivans and other light vehicles, which will promote the development of lighter automotive materials. The light vehicle market has a very large demand for resins such as nylon, polypropylene, polyurethane and other engineering plastics, accounting for more than 30% of the total resin market demand; the demand for polyvinyl butyral accounts for about its total demand 85% of the total.
Plastic requirements
Excellent weather resistance, ensuring that it will not change color or aging and cracking after long-term use (including heat-resistant oxygen aging and light aging);
Good chemical resistance to resist the erosion of oil and daily chemicals;
Easy formability, sufficient fluidity for injection-grade materials, to ensure the formation of complex parts, and improve production efficiency;
Economical requires materials with high cost performance.
Material requirements for exterior parts
Weather resistance: weather-resistant materials should be used for parts that are not painted or electroplated, such as AES, ASA (AAS), PC/PBT (PET), etc.;
Heat resistance: Due to the low ambient temperature, the standard heat resistance level can meet the requirements;
Low temperature resistance: the material is required to have a certain low temperature resistance to prevent the components from cracking in the low temperature environment in winter;
Chemical resistance: to prevent the erosion of oil and acid rain;
Scratch resistance: The material is required to have a certain surface hardness and a low coefficient of friction to prevent scratches.
Material requirements for interior parts
Heat resistance: Due to long-term sunlight in summer, the temperature in the cabin is relatively high, and the interior materials are required to have high heat resistance;
Aging resistance: including thermal oxidative aging and light aging, to prevent aging, discoloration and deterioration of components;
Odor: For the health of drivers and passengers, materials should ensure low volatility and low odor;
Matte: To ensure driving safety, use matte materials or matte textures;
Scratch resistance: the material is required to have a certain surface hardness and a low coefficient of friction to prevent scratching and fluffing
Injection Molding Machine For Auto Parts,Benchtop Injection Molding Machine,Double Injection Molding,Moulding Maker
Ningbo Rhea Machinery Co., Ltd. , https://www.mytao-global.com