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Method for producing pellets from laterite-nickel ore

A technology of lateritic nickel ore and pellet ore, which is applied in the field of ferronickel production technology, can solve the problems of complex application of technical technology and large investment, and achieve the effect of low exploration cost, good physical properties and reduced production cost

Inactive Publication Date: 2011-06-29
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] Due to the high price of nickel and the prosperity of the nickel market in the past two years, many factories have emerged in China, mostly using small blast furnaces to smelt nickel-containing pig iron with laterite ore with low nickel content, which has become the main production process of ferronickel in my country, while other smelting methods are due to Large investment, complex technology and other reasons are rarely used in our country

Method used

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  • Method for producing pellets from laterite-nickel ore
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Examples

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Embodiment 1

[0039] The method for producing pellets from laterite nickel ore comprises the following steps, the first step, batching, including: bentonite with a mass fraction of 1%, quicklime at 1%, and nickel oxide at 98%; Add water to the mixed mixture in the first step until the water content is 10%, and then use a pelletizing machine to make pellets; the third step is to sieve and remove the raw materials with a particle size of less than 10mm to obtain qualified green pellets; the fourth step is to roast and solidify The knot is roasted at a temperature of 1300±100° C. for 60 minutes; the fifth step is to lower the temperature to obtain nickel pellets.

Embodiment 2

[0041] The method for producing pellets from laterite nickel ore comprises the following steps, the first step, batching, including: bentonite with a mass fraction of 4%, quicklime at 3%, and nickel oxide at 93%; Add water to the mixed mixture in the first step until the water content is 15%, and then use a pelletizer to make pellets; the third step is to sieve and remove the raw materials with a particle size of less than 10mm to obtain qualified green pellets; the fourth step is to roast and solidify The knot is roasted at a temperature of 1300±100° C. for 60 minutes; the fifth step is to lower the temperature to obtain nickel pellets.

Embodiment 3

[0043] The method for producing pellets from lateritic nickel ore comprises the following steps, the first step, batching, including: bentonite with a mass fraction of 2%, quicklime at 8%, and nickel oxide at 10%; Add water to the mixed mixture in the first step until the moisture content is 13%, and then use a pelletizer to make pellets; the third step is to sieve and remove the raw materials with a particle size of less than 10 mm to obtain qualified green pellets; the fourth step is to roast and solidify The knot is roasted at a temperature of 1300±100° C. for 60 minutes; the fifth step is to lower the temperature to obtain nickel pellets.

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Abstract

The invention belongs to production techniques of ferronickel, and particularly relates to a method for producing pellets from laterite-nickel ore, which comprises the following steps: proportioning: evenly mixing 1-4 wt% of bentonite, 1-8 wt% of quicklime and the balance of nickel oxide; pelletizing: adding water to the uniform mixture until the water content reaches 10-15%, and pelletizing by using a pelletizer; screening to remove raw materials of which the particle sizes are smaller than 10mm, thereby obtaining qualified raw pellets; and roasting to solidify, and cooling to obtain the nickel pellets. In the invention, the pellets are made into alkaline ore with a certain alkalinity, and the amount of coke is reduced in the blast-furnace smelting, thereby improving the physical properties of the blast-furnace smelted ferronickel; and in the ferronickel smelting process, the coke ratio is low, the yield is high, and the content of nickel in the smelted ferronickel is high.

Description

technical field [0001] The invention belongs to the ferronickel production technology, in particular to a method for producing pellets from laterite nickel ore. Background technique [0002] In recent years, the strong demand for stainless steel has stimulated the demand for metal nickel, resulting in a continuous rise in nickel prices. Driven by high nickel prices, manufacturers at home and abroad have launched ferronickel projects one after another, making ferronickel account for an increasing proportion of global nickel production. Ferronickel production in China began in 2005. The nickel metal content in ferronickel products was only 2,000 tons. In 2006, it reached 30,000 tons. In 2007, it increased sharply to 130,000 tons, which has attracted great attention from people in the nickel industry all over the world. . [0003] China's proven reserves of nickel metal are 7.6 million tons, accounting for 5.4% of the world's total reserves. It is mainly distributed in Gansu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24
Inventor 杨双平池延斌董洁张从容王苗王超李进
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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