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Vanadium extraction cold pressing block and preparation method and applications thereof and vanadium extraction method

A technology of cold briquetting and dry dust removal, which is applied in the direction of manufacturing converters and improving process efficiency, can solve the problems of long process, large site occupation, and long preparation time, and achieve high mechanical strength and cold compaction strength, The effect of improving the oxidation rate and improving the utilization rate

Active Publication Date: 2013-05-15
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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AI Technical Summary

Problems solved by technology

The secondary iron-containing resource dust removal associated with my country's iron and steel industry (such as sintering dust removal, returning ore dust removal, blast furnace dust removal, steelmaking converter LT dry dust removal, vanadium extraction converter LT dry dust removal) produces tens of thousands of tons per year , the iron content of these dedusting ash is as high as about 45%, which has high utilization value. However, the comprehensive utilization of dedusting ash is still relatively difficult, especially the extremely fine powder ash of converter dry dedusting ash, which is particularly difficult to use
At present, most enterprises return dust (sludge) to sintering for batching, but returning to sintering has the disadvantages of long process and low metal yield
In addition, due to the disadvantages of high temperature, fine particle size, and easy deliquescence of calcium oxide in dry dust removal, no one has used it to prepare vanadium extraction coolant.
[0004] CN101525689A discloses a method for preparing self-reducing cold briquettes by mixing and briquetting electric furnace dust, iron sheet and carbon powder, but the cold briquettes prepared by this method are only suitable for blast furnace ironmaking, not suitable for vanadium extraction coolant
[0005] CN101338351A discloses a vanadium-extracting coolant and a preparation method thereof. The vanadium-extracting coolant is prepared from vanadium-extracting sludge, iron concentrate powder and iron oxide scale, but the price of vanadium-containing iron concentrate powder is high, which increases the cost of extracting vanadium. In addition, this method adopts drying under natural conditions for 72 hours to dry wet balls after pelleting, which takes a long time to prepare, takes up a lot of space, and the resulting finished product has low mechanical strength and large dust. The mechanical strength of each ball is 500-700N. The cooling strength of the briquettes is 3-4°C.kg / t molten iron, used in the vanadium extraction process, the oxidation rate of vanadium is about 85.7%

Method used

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  • Vanadium extraction cold pressing block and preparation method and applications thereof and vanadium extraction method
  • Vanadium extraction cold pressing block and preparation method and applications thereof and vanadium extraction method
  • Vanadium extraction cold pressing block and preparation method and applications thereof and vanadium extraction method

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preparation example Construction

[0015] The invention provides a method for preparing vanadium-extracting cold briquetting, which is characterized in that the method comprises uniformly mixing dedusting ash, iron oxide scale and binder, pelletizing the obtained mixture to obtain wet pellets, and then drying the wet pellets , based on the total weight of the mixture, the amount of dust removal ash is 65-95% by weight, preferably 70-80% by weight; the amount of iron oxide scale is 2-32% by weight, preferably 15-25% by weight % by weight; the amount of the binder is 3-33% by weight, preferably 5-15% by weight.

[0016] When the amount of binder is in the range of 15-33% by weight, it will increase the cost of vanadium extraction cold briquette preparation to a certain extent, therefore, based on the total weight of the mixture, the amount of binder is preferably 5-15% by weight.

[0017] According to the preparation method provided by the present invention, the mixing only needs to make the mixture appear unifo...

Embodiment 1

[0038] This example is used to illustrate the vanadium extraction cold briquette provided by the present invention and its preparation method.

[0039] Iron-making dust, iron scale and binder (the weight ratio of ball clay and boron modified phenolic resin is 1:1) are sent into the disc mixer according to the weight ratio of 65:32:3 for mixing and stirring, Mix evenly after 10 minutes, and transport the mixed mixture to the roller briquetting machine for pelletizing. The pressure of the roller briquetting machine is 15MPa / cm 2 , the prepared wet balls are sieved on the vibrating sieve with an aperture of 10 mm to obtain an oversize material with an average particle size of 30 mm, and the ball forming rate is 95%. Dry in a grate dryer at a drying temperature of 250°C and a drying time of 3 hours to obtain the finished cold briquette product C1. SiO in cold briquette C1 2 , CaO, V 2 o 5 、Al 2 o 3 The contents of iron and iron oxides are shown in Table 2. The mechanical st...

Embodiment 2

[0041] This example is used to illustrate the vanadium extraction cold briquette provided by the present invention and its preparation method.

[0042] Vanadium extracting converter LT dry dust removal, steelmaking converter LT dry dust removal, iron scale and binder (the weight ratio of ball clay and boron modified phenolic resin is 1.5: 1) is 45: 40 according to weight ratio: 2:3 into the disc mixer for mixing and stirring, after 10 minutes, mix evenly, and send the mixed mixture to the roller briquetting machine for pelletizing, the pressure of the roller briquetting machine is 15MPa / cm 2 , sieve the wet ball on a vibrating screen with an aperture of 10mm, the average particle size of the prepared wet ball is 30mm, and the ball forming rate is 93%. Dry in a drying machine at a drying temperature of 300° C. and a drying time of 3 hours to obtain the finished product C2 of cold briquetting. SiO in cold briquette C2 2 , CaO, V 2 o 5 、Al 2 o 3 The contents of iron and iro...

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Abstract

The invention discloses a vanadium extraction cold pressing block and a preparation method and applications thereof and a vanadium extraction method. The vanadium extraction cold pressing block is prepared by effectively adopting a dry-method for dust removal, so that not only can the difficulties of dust removal and scale recycling in steel industry be effectively solved, but also the vanadium extraction cold pressing block with high mechanical strength and cooling strength is prepared under the condition of not adding ferro-vanadiumconcentrate fines-containing raw materials, and the cost for extracting vanadium can be lowered to certain extent. The cold pressing block has the advantages of being higher in mechanical strength and cold pressing strength and less in dust, the mechanical strength of each block is 750-1500N, the cooling strength of the cold pressing block is 2.5-4.5 DEG C.kg / t molten iron. The cold pressing block is used for vanadium extracting technique, the oxidation ratio of the vanadium can be achieved by more than 86%, and the utilization efficiency of the vanadium resources can be improved effectively.

Description

technical field [0001] The invention relates to a vanadium extraction cold briquette, a preparation method and application thereof, and a vanadium extraction method. Background technique [0002] The main purpose of the vanadium extraction process is to remove vanadium and preserve carbon, that is, to obtain high-grade vanadium slag, a certain amount of carbon and molten steel at a certain temperature. However, the chemical substances in molten iron continue to oxidize and release heat, resulting in a continuous increase in the temperature of molten iron, which is not conducive to the oxidation of vanadium. In order to better control the temperature, it is necessary to add an appropriate coolant to adjust the temperature during the vanadium extraction process, so as to ensure the optimal temperature range for the vanadium reaction. [0003] At present, how to improve "resource utilization rate, improve the metallurgical performance of cold briquetting, solve the problems of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C7/076
CPCY02P10/20
Inventor 周遵传卓钧徐涛龚洪君熊开伟杜利华
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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