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Method and device for producing high-grade nickel oxide

A high-quality, nickel oxide technology, applied in the direction of nickel oxide/nickel hydroxide, etc., can solve the problems of unstable physical performance indicators, affecting stability, uniformity, large investment in fixed assets, etc., to reduce labor intensity of workers, without Effects of leakage and loss, saving washing water

Inactive Publication Date: 2008-09-17
郑景宜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these methods and measures have two major defects: 1, the cost of large investment in fixed assets, equipment maintenance and maintenance is very large; 2, because the reaction process of spherical nickel hydroxide is a dynamic process, Ni 2+ , OH - , NH + , the three generate β-Ni(OH)2 in the reaction, which is a dynamic reaction, overflows out of the reactor, and a new equilibrium point is continuously formed in the reactor, so the physical performance index of the product is unstable, thereby affecting the β-Ni ( Oh) 2 Stability, uniformity, resulting in β-Ni(OH) 2 Particle size, specific surface area, microstructure indicators such as grain size, poor stability

Method used

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  • Method and device for producing high-grade nickel oxide
  • Method and device for producing high-grade nickel oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] From figure 2 It can be seen that the airtight washing and filtering device required for the method of producing high-quality nickel oxide by nickel salt complex precipitation is composed of a frame 3 and a motor 4 on it, a lift pipe 9 connecting the motor 4 and the container, and a support 6 and the track 5 on it and the container; the container is composed of an upper cover 1 and a base 2, and the base 2 has many holes on which there are filter screens and filter cloth; between the upper cover 1 and the base 2 It is connected and fixed by the inner and outer locks 7; the container is placed on the track 5 on the support 6 through the rollers provided at the bottom of the base 2; the cavity at the bottom of the base 2 is provided with a drainpipe for centralized drainage; the upper cover 1 is provided with There is a feed port 8, a water inlet 11, a lift pipe 9 connected to the motor, and an air intake valve 10 connected to the air compressor.

Embodiment 2

[0038] From figure 1 Visible, the method for producing high-quality nickel oxide by nickel salt complex precipitation of the present invention, its steps are as follows:

[0039] (1) configuration concentration is the nickel sulfate aqueous solution a of 1.2mol / L;

[0040] (2) configuration concentration is the ammonia solution b of 1.0mol / L;

[0041] (3) configuration concentration is the sodium hydroxide solution c of 1.0mol / L;

[0042] (4) The above-mentioned three kinds of solutions are respectively according to the flow rate: a solution is 60L / h, b solution is 10L / h, c solution is 30L / h and is continuously pumped into the reactor;

[0043] (5) Turn on the reactor agitator, control the temperature in the reactor to be 20° C., the pH value is 7, and the stirring speed is 100 rpm to carry out precipitation reaction and grain growth;

[0044] (6) Take out 100ml mixed solution from the reaction kettle of step (5) every half hour, carry out solid-liquid separation by Buchne...

Embodiment 3

[0048] From figure 1 Visible, the present invention produces the method for high-quality nickel oxide with nickel salt complex precipitation, and its steps are as follows:

[0049] (1) configuration concentration is the nickel sulfate aqueous solution a of 2.8mol / L;

[0050] (2) configuration concentration is the ammonia solution b of 10mol / L;

[0051] (3) configuration concentration is the sodium hydroxide solution c of 35mol / L;

[0052] (4) The above-mentioned three kinds of solutions are respectively according to the flow rate: a solution flow rate is 260L / h; b solution flow rate is 120L / h; c solution flow rate is continuously pumped into the reactor at 200L / h;

[0053] (5) Turn on the reactor stirrer, control the temperature in the reactor to be 70° C., the pH value to be 11.5, and the stirring speed to be 180 rpm to carry out precipitation reaction and grain growth;

[0054] (6) Take out 150ml mixed solution from the reaction kettle in step (5) at intervals of 1 hour,...

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Abstract

The invention relates to a method for producing high quality nickel oxide by controlling crystal growth via nickel complex precipitation and a device thereof. The method comprises the steps of simultaneously controlling pH value, temperature, stirring speed, and the ratio of nickel salt, ammonia and sodium hydroxide; monitoring the 'ternary system' concentration (nickel sulfate (Ni<2+>), sodium hydroxide (OH<->) and ammonia (NH<+>)) in the supernatant in a reaction vessel (on-line system crystal ternary control method) and controlling the concentration range thereof to obtain high-purity sphere precursors of adjustable D50 particle diameter about 1-20 mum with uniform particles and good dispersion; and filtering, washing and calcinating under sealing to obtain high quality nickel oxide. The inventive method has the advantages of no waste gas discharge, improved working environment, ensuring operators in good health, reduced labor intensity, washing and filtering integration, saving a large amount of washing water, low energy consumption, environmental friendliness, and low time and labor consumption; and is superior to the prior washing and filtering method including centrifugation, plate-type filtration and vacuuming.

Description

technical field [0001] The invention relates to a production method and device for high-quality nickel oxide, in particular to a production method and device for producing high-purity nickel oxide with spherical shape, uniform and well-dispersed particles, controllable particle size and reasonable distribution. technical background [0002] Nickel oxide (NiO) is an important inorganic material, which is mainly used in industry as a catalyst, production of battery electrodes, semiconductors (such as varistors, thermistors), magnetic materials (nickel-zinc ferrite), glass and ceramic coloring materials, powder raw materials for supercapacitors. An ideal nickel oxide powder should have the following characteristics: high purity, spherical shape, adjustable particle size from 1 to 10 μm, uniform and well-dispersed particles. [0003] NiO is a kind of oxidation catalyst with good catalytic effect, Ni 3+ It has a 3d orbital, has a preferential adsorption tendency for multi-elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04
Inventor 郑景宜吕文广
Owner 郑景宜
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