CN1151089C - Process for calcining cement clinker from raw material containing tungsten - Google Patents

Abstract

A process for calcining cement clinker with tungsten-containing raw materials, using tungsten-containing raw materials as mineralizers for calcined cement clinker, directly adding them to cement raw materials before calcining, and controlling the limestone saturation coefficient KH to 0.88-0.96, silicon The acid rate SM is 1.8-2.6, the aluminum oxygen rate IM is 1.0-1.6; the tungsten content in the tungsten-containing raw material is 0.005-50.00% (weight), without or with a small amount of fluorine-containing mineralizer; in cement clinker The tungsten content is 0.0005-0.100% (weight); the invention makes full use of wastes and is beneficial to environmental protection.

Description

Calcination of cement clinker with tungsten-containing raw materials

The invention relates to the field of cement, and more specifically relates to a process for calcining cement clinker by using tungsten-containing waste, tungsten ore, tungsten ore concentrate, tungsten ore tailings or other tungsten-containing materials as one of the raw materials for producing cement.

The production of existing cement is to grind and homogenize limestone, clay, iron powder, coal and other raw materials, and then calcinate them into cement clinker in a rotary kiln or shaft kiln. In order to improve the performance of cement, there are cement raw materials in the prior art. Add a small amount of additives, such as fluorite mineralizer, fluorite gypsum composite mineralizer, fluorite barite composite mineralizer, fluorite copper-zinc ore tailings composite mineralizer, fluorite lead-zinc tailings composite mineralizer , fluorite pyrite mineralizer, fluorite tin tailings composite mineralizer, fluorite pyrite composite mineralizer, fluorine sulfur composite mineralizer, etc. These mineralizers can improve the quality of cement clinker, However, inadvertent control in the production process will produce rapid or slow coagulation side effects; the commonly used mineralizers such as fluorine-sulfur composite mineralizers are in the process of calcination of cement clinker, and some harmful components such as fluorine or sulfur will be released with time. Exhaust gas escapes and pollutes the environment.

The purpose of the present invention is to address the shortcomings of the prior art, to provide a process for calcining cement clinker with tungsten-containing raw materials, and to comprehensively utilize resources, to use tungsten-containing waste, tungsten ore, tungsten ore concentrate, tungsten ore tailings or Other tungsten-containing materials are used as mineralizers for calcined cement clinker to improve the burnability of cement raw materials, increase output, quality, energy saving and reduce environmental pollution.

The process of calcining cement clinker with tungsten-containing raw materials in the present invention includes: using tungsten-containing raw materials as mineralizers for calcining cement clinker, directly adding them to cement raw materials before calcining, and controlling the limestone saturation coefficient KH to 0.88--0.96 , Silicic acid rate SM is 1.8--2.6, aluminum oxide rate IM is 1.0--1.6.

The tungsten-containing raw material may be tungsten-containing waste, tungsten ore, tungsten ore concentrate, tungsten ore tailings or other tungsten-containing materials.

The tungsten content in the tungsten-containing raw material is 0.005--50.00% by weight, without or with a small amount of fluorine-containing mineralizer.

The content of tungsten in cement clinker is 0.0005--0.100% (weight).

The invention can be used for rotary kiln or shaft kiln for producing cement without changing the original process flow and production equipment basically.

Compared with the prior art, the present invention has the following advantages:

1. The present invention uses tungsten-containing waste, tungsten ore or tungsten ore tailings, etc. as mineralizers for calcined cement clinker, and may not be mixed with fluorine or sulfur mineralizers, or mixed with a small amount of fluorine-containing mineralizers to replace the currently widely used mineralizers. The use of fluorine-containing fluorine mineralizers or fluorine-sulfur composite mineralizers can avoid or greatly reduce the pollution of cement kiln exhaust gas _SO2 or fluorine;

2. The present invention uses tungsten-containing waste, tungsten ore or tungsten ore tailings as mineralizers for calcined cement clinker, which not only develops new raw materials for producing cement clinker, but also makes full use of resources.

3. The use and implementation of the process of the present invention basically does not need to change the original production process and equipment, and is easy to implement in existing cement plants;

4. The present invention uses tungsten-containing waste or tungsten ore tailings as raw materials for calcining cement clinker, fully utilizes waste, and is beneficial to environmental protection.

The present invention is described further below by embodiment.

Example 1

600 tons of tungsten ore with a _WO3 content of 0.2%, 138,000 tons of limestone, 15,000 tons of clay, and 1,100 tons of iron powder are used to prepare raw meal. The saturation coefficient KH of limestone is 0.90--0.96, and the rate of silicic acid SM is 1.8-- 2.2. The alumina ratio IM is 1.0--1.5. After grinding and homogenizing, 90,000 tons of clinker is calcined in the vertical kiln. The clinker output is 9% higher than the clinker output using fluorite mineralizer, the 28-day compressive strength of the clinker is increased by 3MPa, and the coal saving is 8%.

Example 2

800 tons of industrial waste with a _WO3 content of 0.04%, 71,000 tons of limestone, 8,000 tons of clay, and 400 tons of iron powder are used to prepare raw meal. The saturation coefficient KH of limestone is 0.88--0.94, and the rate of silicic acid SM is 2.0-- 2.6. The alumina ratio IM is 1.2--1.6. After grinding and homogenizing, 50,000 tons of clinker is calcined in a rotary kiln. The 28-day compressive strength of clinker is increased by 2MPa, saving 8% of coal.

Example 3

600 tons of tungsten tailings with a _WO3 content of 0.006%, 25,000 tons of limestone, 3,000 tons of clay, and 100 tons of iron powder are used to prepare raw meal. -2.2. The alumina ratio IM is 1.1--1.4. After grinding and homogenizing, 18,000 tons of clinker is calcined in the vertical kiln. The clinker output is 2.5MPa higher than the 28-day compressive strength of the clinker using the fluorite mineralizer, and the coal saving is 6%.

Claims (2)

1. use the calcining cement clinker from raw material containing tungsten method for one kind, it is characterized in that with the mineralizer of tungstenic element raw material as calcination of cement clinker, before calcining, directly join in the cement slurry, the W content of tungstenic element raw material is 0.006%～0.20% (weight), W content is 0.0005%～0.100% (weight) in the cement clinker, do not mix or mix a small amount of fluorine-containing mineralizer, the fuel of calcination of cement clinker is coal, other proportion of raw materials is: Wingdale 87.1%～89.2% (weight), clayey raw material 9.7%～10.5% (weight), ferriferous raw material 0.35%～0.71% (weight), control Wingdale saturation factor KH is 0.88～0.96, silica modulus SM is 1.8～2.6, and aluminium-oxygen modulus IM is 1.0～1.6.

2. the calcining cement clinker from raw material containing tungsten method of using according to claim 1 is characterized in that described tungstenic element raw material is tungstenic refuse, tungsten ore or tungsten ore concentrate.