Description. Also called silica sand or quartz sand, silica is made of silicon dioxide (SiO 2). Silicon compounds are the most significant component of the Earth's crust. Since sand is plentiful, easy to mine and relatively easy to process, it is the primary ore source of silicon. The metamorphic rock, quartzite, is .

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From 1991 to 1995, China reported more than 24,000 deaths due to silicosis each year. In the United States, it is estimated that between one and two million workers have had occupational exposure to crystalline silica dust and 59,000 of these workers will develop .

• Other names: Miner's phthisis, Grinder's asthma, Potter's .

Occupational exposure to silica dust in the mining industry is a global concern. The labor force in most developing countries is comprised largely of migrant workers and the attrition rates are high. Over one million mineworkers in China and 500,000 in South Africa have been diagnosed with silicosis.

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Occupational Exposure to Respirable Crystalline Silica -- Review of Health Effects Literature and Preliminary Quantitative Risk Assessment TABLE OF CONTENTS I. Health Effects Literature Review 7 I.A. Introduction 7 I.A.1. Background Information on Crystalline Silica and the Literature Review 7 I.A.2.

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Oct 09, 2018 · Jelly Liu Product Manager at Lianyungang CT silica powder Co.,Ltd. Lianyungang City, Jiangsu, China Mining & Metals