Process for producing nickel iron from low catarinite

A method utilizes lean ferronickel ores to produce ferronickel which is taken as raw material for smelting stainless steel. The lean ferronickel ores containing very low ferronickel (less than one percent, for example) are processed. After the selective reduction is carried out, the metallization rate of iron is 20 to 80 percent, which depends on the grade of the nickel and iron in the ore as well as nickel content demand in the ferronickel products, so the method solves the problem that a large quantity of the lean ferronickel ores (laterite ores) cannot be utilized for a long time, thus enlarging nickel resources. High oxidative iron slag generated by smelting ferronickel leads the iron to be recycled by an electric furnace or a submerged arc furnace; meanwhile, the slag has stronger dephosphorizing capability.

Technology for smelting iorn in blast furnace with pre-reducing coal-base pellets

A pre-reducing two-step iron smelting technology includes pre-reducing ore to obtain pre-reduced pellets, loading then in blast furnace, final reducing and smelting. Said pre-reduced pellets are madeup of iron ore powder, coal powder and adhesive through proportional mixing, granulating and reducing at 1200-1350 deg.C for 10-35 min. Its advantages are high productivity of blast furnace and low coke ratio.

Carbonization process of high-volatilize content coal

The invention relates to a carbonization process of high volatile coal, a direct heating process that heats and distills high volatile coal by using high temperature cycle gas in a shaft furnace as a carrier. Lump coal that moves up and down in the shaft furnace is heated by rising hot gas and the discharged volatiles form char; the char is cooled by cold gas that is introduced by the furnace bottom from the lower part of a furnace and then discharged outside the furnace; the rising gas is introduced outside finally by the furnace top, washed, purified and cooled; one part is taken as a cycle cooling medium, one part is taken as a cycle heat carrier after being per-heated and the rest is taken as a gas external supply and the calorific value is equal to that of a coke oven gas.

Converter bottom granulated-coal heating technology

The present invention is coal burning thermal technology for direct reducing furnace. In the bottom rotary furnace using coal with high volatile as fuel, granulated coal is spread to the surface of material layer via the feeding bin at the top and the vibrating feeder at the bottom. The volatile relieved by heating and the CD produced by the material layer are burned in the hot blast from the topand the sides of the furnace to supply heat required by the bottom rotary furnace. The semicoke forming material surface protecting layer may be recovered after discharge.

Coal base hot-air rotary hearth furnace melting reduction iron-smelting method

IMPROVED SMELTING TECHNOLOGY OF ELECTRIC FURNACE

... 利用旋流式煤氧枪强化电炉冶炼缩短冶炼时间，大幅度地降低电炉钢的电耗。根据电炉容量和冶炼温度采用１－３支旋流式煤氧枪，安装电炉壁上，呈一定的倾角和切向角，指向电炉内的低温区，亦可增设移动式旋流式煤氧枪置于操作炉门口。冶炼操作特点，在熔化期的初期和中期，可利用煤氧枪和电炉通电同时向炉内供热，也可单独采用煤氧枪供热。旋流式煤氧枪操作参数、煤粉量为０．５－１．５公斤／吨·分，供氧量为０．７－３标米3／吨·分。 ...

Bead iron producing process in rotary hearth furnace and its separating method

The present invention relates to solid reduction process for producing iron in furnace other than blast furnace. The bead iron produced by rotary health furnace is separated magnetically and separated remainder is compounded with carbon containing pellet, briquette and lime for smelting in the vertical furnace to obtain molten iron. The present invention raise reduction rate through controlling the temperature and atmosphere in heating section and reduction section, especially the latter. The present invention has high metallizing rate and the bead iron product has sulphur content lower than 0.06% and is high-quality material for arc furnace.

使用煤基预还原球团的高炉炼铁法

... 一种预还原二步炼铁法，它是为克服传统高炉炼铁存在的难以克服的缺陷所提出的一种新型炼铁法，即第一步先在高炉外实行矿料预还原，制成预还原球团，再将其加入高炉实行终还原及熔炼的二步炼铁。预还原球团是由铁矿粉、煤粉和粘结剂按一定配比制球后在转底炉内以1200～1350℃和10～35分钟还原后制得。最经济、最合理的预还原球团金属化率为75～85％。此外，发明人还将二步炼铁有机联接、合理匹配，更使二步炼铁具有优势互补、能源互用的效果，使高炉生产率显著提高，焦比显著下降。 ...

Method for producing metallized iron-smelting raw material